Ford Fiesta Quiz
Electronic Function Group

Passive Anti-Theft System (PATS) Diagnosis and Testing

In this manual: Electronic Function Group
Service Information — 27Suspension — 48Transmission — 9Brake System — 52Steering — 21Engine — 140Manual Transmission, Clutch, Transfer Case and Power Transfer Unit — 48Exhaust System — 6Fuel System — 21Climate Control System — 58Instrumentation and Warning Systems — 26Battery and Charging System — 20Infotainment Systems — 41Lighting — 29Power Distribution — 11Electronic Function Group — 30Body and Paint — 275Frame and Mounting — 3
~25min read

RFA Module Diagnostic Trouble Code Chart

The diagnosis in this manual assumes a certain level of skill and knowledge of Ford-approved diagnostic procedures.
REFER TO: Diagnostic Methods (100-00 General Information, Description and Operation).

Trouble Code Description Action
B102B: 05 Passive Key: System Programming Failure Fewer than 2 keys are programmed into the RFA module. If other PATS Diagnostic Trouble Codes (DTCs) are present, repair them first. If DTC B102B:05 is the only DTC present, PROGRAM a minimum of 2 keys.
REFER TO: Programming Keys Using Diagnostic Equipment (419-01C, Passive Anti-Theft System (PATS) — Vehicles With: Keyless Entry and Push Button Start, General Procedures).
B10C7:1F Interior Rear Antenna: Intermittent Circuit GO to Pinpoint Test A
B10K8: 1F Interior Center Antenna: Intermittent Circuit GO to Pinpoint Test A
B10C9:1F Interior Front Antenna: Intermittent Circuit GO to Pinpoint Test A
B10D5:13 PATS Antenna: Open Circuit The RFA module received an incomplete or corrupted response from the PATS transceiver. INSTALL a new transceiver.
REFER TO: Passive Anti-Theft System (PATS) Transceiver (419-01C Passive Anti-Theft System (PATS) — Vehicles With: Keyless Entry and Push Button Start, Removal and Installation).
B10D6:62 PATS Ignition Status: Signal Comparison Failure GO to Pinpoint Test F
B10D7:05 PATS Key: System Programming Failure GO to Pinpoint Test D
B10D8:00 PATS Keys Less Than Programmed Minimum: No Subtype Information Fewer than 2 keys are programmed into the RFA module. If other PATS Diagnostic Trouble Codes (DTCs) are present, repair them first. If DTC B10D8:00 is the only DTC present, PROGRAM a minimum of 2 keys.
REFER TO: Programming Keys Using Diagnostic Equipment (419-01C, Passive Anti-Theft System (PATS) — Vehicles With: Keyless Entry and Push Button Start, General Procedures).
B10D9:87 PATS Transceiver: Message Missing GO to Pinpoint Test E
B10DA:51 PATS Target Identifier: Not Programmed The RFA module does not have a PCM identifier. PERFORM a parameter reset.
REFER TO: Passive Anti-Theft System (PATS) Parameter Reset (419-01C Passive Anti-Theft System (PATS) — Vehicles With: Keyless Entry and Push Button Start, General Procedures).
B10DA:62 PATS Target Identifier: Signal Comparison Failure The RFA module has stored an incorrect PCM identifier. PERFORM a parameter reset.
REFER TO: Passive Anti-Theft System (PATS) Parameter Reset (419-01C Passive Anti-Theft System (PATS) — Vehicles With: Keyless Entry and Push Button Start, General Procedures).
B10E6:11 PATS Power Supply: Short to Ground GO to Pinpoint Test E
B10E6:12 PATS power supply: short to battery GO to Pinpoint Test E
U0100:87 Lost Communication With ECM/PCM "A": No Sub Type Information GO to Pinpoint Test F
All Other Diagnostic Trouble Codes (DTCs) -
Refer to: Remote Function Actuator (RFA) Module (419-10 Multifunction Electronic Modules, Diagnosis and Testing).

PCM Diagnostic Trouble Code Chart

The diagnosis in this manual assumes a certain level of skill and knowledge of Ford-approved diagnostic procedures.
REFER TO: Diagnostic Methods (100-00 General Information, Description and Operation).

Trouble Code Description Action
U0167:00 Lost communication with vehicle immobilizer control module: no sub-type information GO to Pinpoint Test G
U0426:00 Incorrect data received from vehicle immobilizer control module: no sub-type information GO to Pinpoint Test G
All Other Diagnostic Trouble Codes (DTCs) - For the procedure, refer to the appropriate Group 303 section.

Symptom Chart

Symptom Chart: PATS

The diagnosis in this manual assumes a certain level of skill and knowledge of Ford-approved diagnostic procedures.
REFER TO: Diagnostic Methods (100-00 General Information, Description and Operation).

Condition Possible Causes Action
Vehicle does not start with the passive key in certain locations inside the vehicle, but starts when using the passive key backup start location
  • Refer to Pinpoint Test
  • GO to Pinpoint Test A
Unable to turn ignition on or vehicle does not start
  • Refer to Pinpoint Test
  • GO to Pinpoint Test B
Key Not Detected displayed in the message center
  • Refer to Pinpoint Test
  • GO to Pinpoint Test C
Unable to program keys
  • Refer to Pinpoint Test
  • Using the diagnostic scanner, PERFORM the RFA module self-test. REFER to the RFA Module DTC Chart in this section.

Pinpoint Tests

Vehicle does not start with the intelligent key in certain areas inside the vehicle, but starts using the backup intelligent key


For circuit and connector information, refer to Wiring Diagrams Cell 112.

Normal Operation and Fault Symptoms


Refer to: Passive Anti-Theft System (PATS) - System Operation and Component Description (419-01C Passive Anti-Theft System (PATS) - Vehicles With: Keyless Entry and Push Button Start, Description and Operation).


RFA Module DTC Setting Conditions


Trouble Code Description Fault Trigger Conditions
B10C7:1F Interior Rear Antenna: Intermittent Circuit Sets when the RFA module detects an open or short circuit in one of the PATS rear antenna circuits.
B10K8: 1F Interior Center Antenna: Intermittent Circuit Sets when the RFA module detects an open or short circuit in one of the PATS center antenna circuits.
B10C9:1F Interior Front Antenna: Intermittent Circuit Sets when the RFA module detects an open or short circuit in one of the PATS front antenna circuits.

Possible Causes

  • Wiring, Terminals or Connectors
  • Environmental Interference
  • PATS Front Antenna
  • PATS Center Antenna
  • PATS Rear Antenna
  • RFA module

DIAGNOSTIC TEST A: VEHICLE DOES NOT START WITH PASSIVE KEY IN CERTAIN AREAS OF THE VEHICLE, BUT STARTS WITH THE PASSIVE KEY IN A BACKUP LOCATION
A1 CHECK INTELLIGENT KEY LOCATION
  • Check the location of the passive key. If it is in the far corners of the vehicle interior, move the passive key out of these locations and attempt to start the vehicle.

Does the vehicle start?
Yes System is OK. INFORM the customer that the vehicle is operating normally.
No GO to A2
A2 CHECK FOR ENVIRONMENTAL INTERFERENCE
  • Check for a battery charger or other wireless device that may interfere with the intelligent key. If any device is detected, remove the device and attempt to start the vehicle.

Does the vehicle start?
Yes System is OK. INFORM the customer that the vehicle is operating normally.
No GO to A3
A3 CHECK SUSPECT ANTENNA CIRCUITS FOR SHORT TO VOLTAGE
  • Disconnect the RFA module C3503E.
  • Disconnect the suspect PATS antenna.
  • Use the backup method to turn the ignition on by placing the intelligent key near the PATS transceiver and pressing the START/STOP button.
  • Action:
    Click to display the connectors

    PATS Front Antenna


    Positive lead Measurement/Action Negative lead
    C2065-1 Ground
    C2065-2 Ground

    Click to display the connectors

    PATS Center Antenna


    Positive lead Measurement/Action Negative lead
    C325-1 Ground
    C325-2 Ground

    Click to display the connectors

    PATS Rear Antenna


    Positive lead Measurement/Action Negative lead
    C4378-1 Ground
    C4378-2 Ground

Is there voltage present?
Yes REPAIR the faulty circuit.
No GO to A4
A4 CHECK SUSPECT ANTENNA CIRCUITS FOR SHORT TO GROUND
  • Ignition OFF.
  • Action:
    Click to display the connectors

    PATS Front Antenna


    Positive lead Measurement/Action Negative lead
    C2065-1 Ground
    C2065-2 Ground

    Click to display the connectors

    PATS Center Antenna


    Positive lead Measurement/Action Negative lead
    C325-1 Ground
    C325-2 Ground

    Click to display the connectors

    PATS Rear Antenna


    Positive lead Measurement/Action Negative lead
    C4378-1 Ground
    C4378-2 Ground

Is the resistance greater than 10000 ohms?
Yes GO to A5
No REPAIR the faulty circuit.
A5 CHECK SUSPECT ANTENNA CIRCUITS FOR OPEN
  • Action:
    Click to display the connectors

    PATS Front Antenna


    Positive lead Measurement/Action Negative lead
    C2065-1 C3503E-9
    C2065-2 C3503E-2

    Click to display the connectors

    PATS Center Antenna


    Positive lead Measurement/Action Negative lead
    C325-1 C3503E-17
    C325-2 C3503E-5

    Click to display the connectors

    PATS Rear Antenna


    Positive lead Measurement/Action Negative lead
    C4378-1 C3503E-11
    C4378-2 C3503E-4

Is the resistance less than 3 ohms?
Yes INSTALL a new antenna. For the PATS front antenna:
REFER to: Passive Anti-Theft System (PATS) Front Antenna (419-01C Passive Anti-Theft System (PATS) - Vehicles With: Keyless Entry and Push Button Start, Removal and Installation). For the PATS center antenna:
REFER to: Passive Anti-Theft System (PATS) Center Antenna (419-01C Passive Anti-Theft System (PATS) - Vehicles With: Keyless Entry and Push Button Start, Removal and Installation). For the PATS rear antenna:
REFER to: Passive Anti-Theft System (PATS) Rear Antenna (419-01C Passive Anti-Theft System (PATS) - Vehicles With: Keyless Entry and Push Button Start, Removal and Installation). VERIFY the system operates correctly. If the concern remains, GO to A6.
No REPAIR the faulty circuit.
A6 CHECK RFA (REMOTE FUNCTION ACTUATOR) MODULE OPERATION
  • Disconnect and inspect all RFA module connectors.
  • Repair:
    • corrosion (install new connectors or terminals, clean the module pins)
    • damaged or bent terminals/pins - install new terminals/pins
    • pushed-out pins - install new pins as necessary
  • Reconnect all RFA module connectors and make sure they are properly seated and latched.
  • Operate the system and determine if the concern is still present.

Is the concern still present?
Yes CHECK OASIS for any applicable Technical Service Bulletins (TSBs). If a TSB exists for this condition, STOP this test and FOLLOW the TSB instructions. If no TSB applies to this concern, INSTALL a new RFA module.
REFER TO: Remote Function Actuator (RFA) Module (419-10 Multifunction Electronic Modules, Removal and Installation).
No The system is currently operating correctly. The concern may have been caused by module connections. Refer to the root cause of any connector or terminal issues.

Unable to turn ignition on or vehicle does not start

Normal Operation and Fault Symptoms


Refer to: Passive Anti-Theft System (PATS) - System Operation and Component Description (419-01C Passive Anti-Theft System (PATS) - Vehicles With: Keyless Entry and Push Button Start, Description and Operation).

Possible Causes

  • Drivability concern
  • Starting System
  • PATS Concern

DIAGNOSTIC TEST B: UNABLE TO TURN IGNITION ON OR VEHICLE DOES NOT START
B1 CHECK KEY NOT DETECTED MESSAGE
  • NOTE: Before performing any diagnostics, press the unlock button on the intelligent key to make sure the intelligent key disabled feature is not the cause of the concern. Check the message center while pressing the START/STOP button.

Is the Key Not Detected message displayed in the message center?
Yes GO to Pinpoint Test C
No GO to B2
B2 CHECK IPC (INSTRUMENT PANEL CLUSTER) OPERATION
  • Observe the IPC operation while pressing the START/STOP button.

Are any indicators illuminated in the IPC indicating the ignition is on?
Yes GO to B3
No GO to B4
B3 CHECK RFA (REMOTE FUNCTION ACTUATOR) MODULE AND PCM (POWERTRAIN CONTROL MODULE) DIAGNOSTIC TROUBLE CODES (DTCS)
  • Using the diagnostic scan tool, perform the RFA module self-test.
  • Using the diagnostic scan tool, perform a PCM self-test.

Are any RFA module or PCM diagnostic trouble codes (DTCs) present?
Yes REFER to the RFA Module or PCM DTC Chart in this section.
No The condition is not PATS related. CHECK the underlying powertrain. Refer to the Powertrain Control/Emissions Diagnosis (PC/ED) manual.
B4 CHECK DIAGNOSTIC TOOL COMMUNICATION WITH VEHICLE
  • Follow the procedure to establish a diagnostic scan session with the vehicle.
    REFER to: Diagnostic Methods (100-00 General Information, Description and Operation).

Does the diagnostic scanner communicate with the vehicle?
Yes The no start condition is not PATS related. CHECK which accessories do not receive power with the ignition on.
REFER to: Steering Wheel and Column Electrical Components (211-05 Steering Column). Wheel and Column Electrical Components, Diagnosis and Testing).
No
REFER TO: Communication Network (418-00 Communication Network, Diagnosis and Testing).

Key Not Detected message displayed in message center

Normal Operation and Fault Symptoms


Refer to: Passive Anti-Theft System (PATS) - System Operation and Component Description (419-01C Passive Anti-Theft System (PATS) - Vehicles With: Keyless Entry and Push Button Start, Description and Operation).

Possible Causes

  • Passive Key
  • Environmental Interference

Visual Inspection and Preliminary Diagnosis

  • Inspect the passive key for damage.

PINPOINT TEST C: KEY NOT DETECTED MESSAGE DISPLAYED IN MESSAGE CENTER
C1 CHECK RKE (REMOTE KEYLESS ENTRY) TRANSMITTER OPERATION
  • Press the lock and unlock buttons on the RKE transmitter of the suspect passive key.

Do the doors lock and unlock?
Yes GO to C2
No
REFER TO: Locks, Latches and Entry Systems (501-14 Handles, Locks, Latches and Entry Systems, Diagnosis and Testing).
C2 CHECK INTELLIGENT KEY OPERATION IN MULTIPLE AREAS
  • Place the intelligent key in several locations inside the vehicle and press the START/STOP button each time.

Does the intelligent key start the ignition only in certain locations?
Yes GO to Pinpoint Test A
No GO to C3
C3 CHECK FOR ENVIRONMENTAL INTERFERENCE
  • Check for a battery charger or other wireless device that may interfere with the intelligent key. If any device is detected, remove the device and press the START/STOP button.

Does the ignition turn on?
Yes INFORM the customer of the cause of concern and that the vehicle is operating normally.
No GO TO C4
C4 CHECK INTELLIGENT KEY
  • Place the intelligent key in the backup location (near the PATS transceiver) and press the START/STOP button.

Does the ignition turn on?
Yes GO to Pinpoint Test A
No GO to C5
C5 CHECK INTELLIGENT KEY PROGRAMMING
  • Program the passive key.
    Refer to: Key Programming with Diagnostic Equipment (419-01C Passive Anti-Theft System (PATS) - Vehicles With: Keyless Entry and Push Button Start, General Procedures).

Is the passive key programmed successfully?
Yes Concern was an unprogrammed passive key.
No REPLACE the passive key. PROGRAM the new passive key.
Refer to: Key Programming with Diagnostic Equipment (419-01C Passive Anti-Theft System (PATS) - Vehicles With: Keyless Entry and Push Button Start, General Procedures). VERIFY the system operates correctly. If the concern is still present, GO to C6.
C6 CHECK THE RFA (REMOTE FUNCTION ACTUATOR) MODULE OPERATION
  • Disconnect and inspect all RFA module connectors.
  • Repair:
    • corrosion (install new connectors or terminals, clean the module pins)
    • damaged or bent terminals/pins - install new terminals/pins
    • pushed-out pins - install new pins as necessary
  • Reconnect all RFA module connectors and make sure they are properly seated and latched.
  • Operate the system and determine if the concern is still present.

Is the concern still present?
Yes CHECK OASIS for any applicable Technical Service Bulletins (TSBs). If a TSB exists for this condition, STOP this test and FOLLOW the TSB instructions. If no TSB applies to this concern, INSTALL a new RFA module.
REFER TO: Remote Function Actuator (RFA) Module (419-10 Multifunction Electronic Modules, Removal and Installation).
No The system is currently operating correctly. The concern may have been caused by module connections. Refer to the root cause of any connector or terminal issues.

B10D7:05

Normal Operation and Fault Symptoms


Refer to: Passive Anti-Theft System (PATS) - System Operation and Component Description (419-01C Passive Anti-Theft System (PATS) - Vehicles With: Keyless Entry and Push Button Start, Description and Operation).

When the RFA module enters the key programming state, it activates the PATS transceiver to read the key located near it. The key is programmed into the RFA module memory if a valid passive key is used and there are no PATS concerns.


RFA Module DTC Setting Conditions


Trouble Code Description Fault Trigger Conditions
B10D7:05 PATS Key: System Programming Failure Sets when a passive key is unsuccessfully programmed into the RFA module.

Possible Causes

  • Passive Key
  • PATS transceiver

Visual Inspection and Preliminary Diagnosis

  • Inspect the passive key for damage.

DIAGNOSTIC TEST D: B10D7:05
NOTE: At least 2 passive keys must be present before performing this precise test.
D1 CHECK THE OTHER RFA (REMOTE FUNCTION ACTUATOR) MODULE DIAGNOSTIC TROUBLE CODES (DTCS)
  • Review the RFA module self-test results.

Are there any other RFA module diagnostic trouble codes (DTCs) present?
Yes First CHECK these diagnostic trouble codes (DTCs). Refer to the RFA Module DTC Table in this section.
No GO to D2
D2 CHECK THE PASSIVE KEYS
  • Make sure the correct passive keys are being used with the vehicle.

Are the correct passive keys being used?
Yes GO to D3
No REPLACE the passive key(s) in question. PROGRAM the new passive keys.
Refer to: Key Programming with Diagnostic Equipment (419-01C Passive Anti-Theft System (PATS) - Vehicles With: Keyless Entry and Push Button Start, General Procedures).
D3 PROGRAM THE PASSIVE KEYS
  • Attempt to program the passive key(s) in question.
    Refer to: Key Programming with Diagnostic Equipment (419-01C Passive Anti-Theft System (PATS) - Vehicles With: Keyless Entry and Push Button Start, General Procedures).

Is the key(s) programmed successfully?
Yes Concern was an incomplete passive key programming procedure.
No GO to D4
D4 CHECK BOTH PASSIVE KEYS
  • Attempt to program both passive keys.
    Refer to: Erasing All Keys and Key Programming (419-01C Passive Anti-Theft System (PATS) - Vehicles With: Keyless Entry and Push Button Start, General Procedures).
  • Press the START/STOP button with each passive key in the vehicle, one at a time.

Does the ignition turn on with both passive keys?
Yes Concern was an unprogrammed key.
No If only one passive key works, REPLACE the passive key that is not programmed. PROGRAM the new key.
Refer to: Key Programming with Diagnostic Equipment (419-01C Passive Anti-Theft System (PATS) - Vehicles With: Keyless Entry and Push Button Start, General Procedures). If no passive key works, INSTALL a new PATS transceiver.
Refer to: Passive Anti-Theft System (PATS) Transceiver (419-01C Passive Anti-Theft System (PATS) - Vehicles With: Keyless Entry and Push Button Start, Removal and Installation). PROGRAM the keys.
Refer to: Erasing All Keys and Key Programming (419-01C Passive Anti-Theft System (PATS) - Vehicles With: Keyless Entry and Push Button Start, General Procedures).

B10D9:87, B10E6:11 or B10E6:12


For circuit and connector information, refer to Wiring Diagrams Cell 112.

Normal Operation and Fault Symptoms


Refer to: Passive Anti-Theft System (PATS) - System Operation and Component Description (419-01C Passive Anti-Theft System (PATS) - Vehicles With: Keyless Entry and Push Button Start, Description and Operation).

The RFA module supplies voltage to the PATS transceiver. If the RFA module does not detect a passive key from the PATS antennas, it activates the PATS transceiver as a backup to attempt to detect a programmed passive key. The RFA module also activates the PATS transceiver for key programming procedures. The RFA module starts the key polling sequence by supplying voltage to the transceiver. Once the PATS transceiver is powered, the RFA module sends a signal to the transceiver on the transmit circuit. When the transceiver receives the signal from the RFA module, it reads the PATS key and generates a challenge-response to the RFA module signal, and sends its response on the receive circuit.


RFA Module DTC Setting Conditions


Trouble Code Description Fault Trigger Conditions
B10D9:87 PATS Transceiver: Message Missing Sets when the RFA module does not receive a response from the PATS transceiver.
B10E6:11 PATS Power Supply: Short to Ground Sets when the RFA module detects a short to ground in the PATS transceiver power supply circuit.
B10E6:12 PATS power supply: short to battery Sets when the RFA module detects a short to voltage in the PATS transceiver power supply circuit.

Possible Causes

  • Environmental Interference
  • Passive Key

Visual Inspection and Preliminary Diagnosis

  • Inspect the passive key for damage.

DIAGNOSTIC TEST E: B10D9:87, B10E6:11 OR B10E6:12
E1 CHECK THE DTC (DIAGNOSTIC TROUBLE CODE) B10E6:11 OR B10E6:12
  • Review the RFA module self-test results.

Is DTC B10E6:11 or B10E6:12 present?
Yes For DTC B10E6:11, GO to E2.
For DTC B10E6:12, GO to E4.
No GO to E5
E2 CHECK THE PATS (PASSIVE ANTI-THEFT SYSTEM) TRANSCEIVER FOR A SHORT TO GROUND
  • Ignition OFF.
  • Disconnect the PATS transceiver C252.
  • The ignition is on.
  • Using the scan tool, clear the RFA module diagnostic trouble codes (DTCs).
  • Wait 10 seconds.
  • Using the diagnostic scan tool, perform the RFA module self-test.

Is DTC B10E6:11 still present?
Yes GO to E3
No INSTALL a new PATS transceiver.
Refer to: Passive Anti-Theft System (PATS) Transceiver (419-01C Passive Anti-Theft System (PATS) - Vehicles With: Keyless Entry and Push Button Start, Removal and Installation).
E3 CHECK THE PATS (PASSIVE ANTI-THEFT SYSTEM) TRANSCEIVER POWER SUPPLY CIRCUIT FOR A SHORT TO GROUND
  • Ignition OFF.
  • Disconnect the RFA module C3503A.
  • Action:
    Click to display the connectors
    Positive lead Measurement/Action Negative lead
    C252-1 Ground

Is the resistance greater than 10000 Ohms?
Yes GO to E11
No REPAIR the circuit.
E4 CHECK THE PATS (PASSIVE ANTI-THEFT SYSTEM) TRANSCEIVER POWER SUPPLY CIRCUIT FOR A SHORT TO VOLTAGE
  • Ignition OFF.
  • Disconnect the PATS transceiver C252.
  • Disconnect the RFA module C3503A.
  • The ignition is on.
  • Action:
    Click to display the connectors
    Positive lead Measurement/Action Negative lead
    C252-1 Ground

Is there voltage present?
Yes REPAIR the circuit.
No GO to E11
E5 CHECK THE VOLTAGE AT THE CONTROLLERS (PASSIVE ANTI-THEFT SYSTEM) TRANSCEIVER
  • Ignition OFF.
  • Disconnect the PATS transceiver C252.
  • While pressing the START/STOP button, measure:
    Click to display the connectors
    Positive lead Measurement/Action Negative lead
    C252-1 Ground

Does the voltage immediately exceed 11 volts when the START/STOP button is pressed?
Yes GO to E7
No GO to E6
E6 CHECK THE PATS (PASSIVE ANTI-THEFT SYSTEM) TRANSCEIVER VOLTAGE SUPPLY CIRCUIT FOR OPEN
  • Disconnect the RFA module C3503A.
  • Action:
    Click to display the connectors
    Positive lead Measurement/Action Negative lead
    C252-1 C3503A-10

Is the resistance less than 3 ohms?
Yes GO to E11
No REPAIR the circuit.
E7 CHECK THE PATS (PASSIVE ANTI-THEFT SYSTEM) TRANSCEIVER GROUND CIRCUIT FOR OPEN
  • Action:
    Click to display the connectors
    Positive lead Measurement/Action Negative lead
    C252-2 Ground

Is the resistance less than 3 ohms?
Yes GO to E8
No REPAIR the circuit.
E8 CHECK THE PATS (PASSIVE ANTI-THEFT SYSTEM) TRANSCEIVER COMMUNICATION CIRCUITS FOR SHORT TO VOLTAGE
  • Disconnect the RFA module C3503A.
  • The ignition is on.
  • Action:
    Click to display the connectors
    Positive lead Measurement/Action Negative lead
    C252-3 Ground
    C252-4 Ground

Is there voltage present?
Yes REPAIR the faulty circuit.
No GO to E9
E9 CHECK THE PATS (PASSIVE ANTI-THEFT SYSTEM) TRANSCEIVER COMMUNICATION CIRCUITS FOR SHORT TO GROUND
  • Ignition OFF.
  • Action:
    Click to display the connectors
    Positive lead Measurement/Action Negative lead
    C252-3 Ground
    C252-4 Ground

Is the resistance greater than 10000 ohms?
Yes GO to E10
No REPAIR the faulty circuit.
E10 CHECK THE PATS (PASSIVE ANTI-THEFT SYSTEM) TRANSCEIVER COMMUNICATION CIRCUITS FOR OPEN
  • Ignition OFF.
  • Action:
    Click to display the connectors
    Positive lead Measurement/Action Negative lead
    C252-3 C3503A-11
    C252-4 C3503A-12

Is the resistance less than 3 ohms?
Yes INSTALL a new PATS transceiver.
REFER TO: Passive Anti-Theft System (PATS) Transceiver (419-01C Passive Anti-Theft System (PATS) - Vehicles With: Keyless Entry and Push Button Start, Removal and Installation). CHECK the system for normal operation. If the concern still exists, GO to E11.
No REPAIR the faulty circuit.
E11 CHECK THE RFA (REMOTE FUNCTION ACTUATOR) MODULE FOR PROPER OPERATION
  • Disconnect and inspect all RFA module connectors.
  • Repair:
    • corrosion (install new connectors or terminals, clean the module pins)
    • damaged or bent terminals/pins - install new terminals/pins
    • pushed-out pins - install new pins as necessary
  • Reconnect all RFA module connectors and make sure they are properly seated and latched.
  • Operate the system and determine if the concern is still present.

Is the concern still present?
Yes CHECK OASIS for any applicable Technical Service Bulletins (TSBs). If a TSB exists for this condition, STOP this test and FOLLOW the TSB instructions. If no TSB applies to this concern, INSTALL a new RFA module.
REFER TO: Remote Function Actuator (RFA) Module (419-10 Multifunction Electronic Modules, Removal and Installation).
No The system is currently operating correctly. The concern may have been caused by module connections. Refer to the root cause of any connector or terminal issues.

B10D6:62 or U0100:87

Normal Operation and Fault Symptoms


Refer to: Passive Anti-Theft System (PATS) - System Operation and Component Description (419-01C Passive Anti-Theft System (PATS) - Vehicles With: Keyless Entry and Push Button Start, Description and Operation).

When the ignition is turned off, the RFA module checks the PCM identifier and compares it with the PCM identifier stored in the RFA module memory. If the RFA module does not receive the PCM identifier or the identifier is invalid, PATS is enabled and prevents the engine from starting.


RFA Module DTC Setting Conditions


Trouble Code Description Fault Trigger Conditions
B10D6:62 PATS Ignition Status: Signal Comparison Failure Set when the RFA module does not receive the expected target identifier from the PCM over HS-CAN. The target identifier is sent only once per ignition cycle and is sent within milliseconds after the ignition is turned off.
U0100:87 Lost Communication With ECM/PCM "A": No Sub Type Information Set when the RFA module does not receive the expected target identifier from the PCM over HS-CAN. The target identifier is sent only once per ignition cycle and is sent within milliseconds after the ignition is turned off.

Possible Causes

  • Network Concern
  • Low Battery Charge
  • PCM

DIAGNOSTIC TEST F: B10D6:62 OR U0100:87
F1 CHECK THE BATTERY CHARGE
  • NOTE: It may be necessary to check the battery voltage during engine cranking to make sure the battery voltage does not drop too low and cause the concern. Perform the battery condition test.
    REFER TO: Battery (414-01 Battery, Mounting and Cables, Diagnosis and Testing).

Did the battery pass the battery condition test?
Yes GO to F2
No CHARGE or REPLACE the battery.
REFER TO: Battery (414-01 Battery, Mounting and Cables, Removal and Installation).
F2 CHECK THE DTC (DIAGNOSTIC TROUBLE CODE) U0100:00
  • Review the RFA module self-test results.

Is DTC U0100:00 present?
Yes
Refer to: Remote Function Actuator (RFA) Module (419-10 Multifunction Electronic Modules, Diagnosis and Testing).
No
F3 RECHECK THE RFA (REMOTE FUNCTION ACTUATOR) MODULE DIAGNOSTIC TROUBLE CODES (DTCS) FROM SELF-TEST
  • The ignition is on.
  • Using the scan tool, clear the RFA module diagnostic trouble codes (DTCs).
  • Wait 10 seconds.
  • Using the diagnostic scan tool, perform the RFA module self-test.

Is DTC B10D6:62 or U0100:87 still present?
Yes
No The system is currently operating correctly. The DTC may have been set due to high network traffic or an intermittent condition.
F4 CHECK THE PCM (POWERTRAIN CONTROL MODULE) FOR PROPER OPERATION
  • Disconnect and inspect all PCM connectors.
  • Repair:
    • corrosion (install new connectors or terminals, clean the module pins)
    • damaged or bent terminals/pins - install new terminals/pins
    • pushed-out pins - install new pins as necessary
  • Connect all PCM connectors and make sure they are properly seated and latched.
  • Operate the system and determine if the concern is still present.

Is the concern still present?
Yes CHECK OASIS for any applicable Technical Service Bulletins (TSBs). If a TSB exists for this concern, STOP this test and FOLLOW the TSB instructions. If no TSBs apply to this concern,
Click here to access the guided routine (PCM).
No The system is currently operating correctly. The concern may have been caused by module connections. Refer to the root cause of any connector or terminal issues.

U0167:00 or U0426:00

Normal Operation and Fault Symptoms


Refer to: Passive Anti-Theft System (PATS) - System Operation and Component Description (419-01C Passive Anti-Theft System (PATS) - Vehicles With: Keyless Entry and Push Button Start, Description and Operation).

When the ignition is turned off, the RFA module checks the PCM identifier and compares it with the PCM identifier stored in the RFA module memory. If the RFA module does not receive the PCM identifier or the identifier is invalid, PATS is enabled and prevents the engine from starting.


RFA Module DTC Setting Conditions


Trouble Code Description Fault Trigger Conditions
U0167:00 PATS Ignition Status: Signal Comparison Failure Set when the RFA module does not receive the expected target identifier from the PCM over HS-CAN. The target identifier is sent only once per ignition cycle and is sent within milliseconds after the ignition is turned off.
U0426:00 Lost Communication With ECM/PCM "A": No Sub Type Information Set when the RFA module does not receive the expected target identifier from the PCM over HS-CAN. The target identifier is sent only once per ignition cycle and is sent within milliseconds after the ignition is turned off.

Possible Causes

  • Network Concern
  • Low Battery Charge
  • RFA module

DIAGNOSTIC TEST G: U0167:00 OR U0426:00
G1 CHECK THE BATTERY CHARGE
  • NOTE: It may be necessary to check the battery voltage during engine cranking to make sure the battery voltage does not drop too low and cause the concern. Perform the battery condition test.
    REFER TO: Battery (414-01 Battery, Mounting and Cables, Diagnosis and Testing).

Did the battery pass the battery condition test?
Yes GO to G2
No CHARGE or REPLACE the battery.
REFER TO: Battery (414-01 Battery, Mounting and Cables, Removal and Installation).
G2 CHECK THE COMMUNICATION WITH THE RFA (REMOTE FUNCTION ACTUATOR) MODULE
  • The ignition is on.
  • Using a scan tool, perform the network test.

Does the RFA module respond to the diagnostic scan tool?
Yes GO to G3
No
REFER TO: Communication Network (418-00 Communication Network, Diagnosis and Testing).
G3 CHECK THE RFA (REMOTE FUNCTION ACTUATOR) MODULE DIAGNOSTIC TROUBLE CODES (DTCS)
  • Using the diagnostic scan tool, perform the RFA module self-test.

Are there any RFA module diagnostic trouble codes (DTCs) present?
Yes REFER TO the RFA Module DTC Chart in this section.
No GO to G4
G4 RECHECK THE PCM (POWERTRAIN CONTROL MODULE) DIAGNOSTIC TROUBLE CODES (DTCS) FROM SELF-TEST
  • The ignition is on.
  • Using the diagnostic scan tool, clear the PCM diagnostic trouble codes (DTCs).
  • Wait 10 seconds.
  • Using the diagnostic scan tool, perform a PCM self-test.

Is DTC U0167:00 or U0426:00 still present?
Yes GO to G5
No The system is currently operating correctly. The DTC may have been set due to high network traffic or an intermittent condition.
G5 CHECK THE RFA (REMOTE FUNCTION ACTUATOR) MODULE FOR PROPER OPERATION
  • Disconnect and inspect all RFA module connectors.
  • Repair:
    • corrosion (install new connectors or terminals, clean the module pins)
    • damaged or bent terminals/pins - install new terminals/pins
    • pushed-out pins - install new pins as necessary
  • Reconnect all RFA module connectors and make sure they are properly seated and latched.
  • Operate the system and determine if the concern is still present.

Is the concern still present?
Yes CHECK OASIS for any applicable Technical Service Bulletins (TSBs). If a TSB exists for this condition, STOP this test and FOLLOW the TSB instructions. If no TSB applies to this concern, INSTALL a new RFA module.
REFER TO: Remote Function Actuator (RFA) Module (419-10 Multifunction Electronic Modules, Removal and Installation).
No The system is currently operating correctly. The concern may have been caused by module connections. Refer to the root cause of any connector or terminal issues.

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