IG2 Signal Malfunction (B2788)

DESCRIPTION

The steering lock ECU (steering lock actuator assembly) receives power from the IG2 relay. When the voltage value indicated by the IG signal from the certification ECU (smart key ECU assembly) equals to the voltage that is applied to the steering lock ECU (steering lock actuator assembly), the steering wheel will be unlocked. The steering lock ECU (steering lock actuator assembly) will not lock the steering wheel when power from the IG2 relay is present. This prevents the steering from being locked while the vehicle is moving.

DTC No.	DTC Detecting Condition	Trouble Area
B2788	Different information is obtained from IG2 signals received directly from the IG2 circuit, and from IG2 signals sent via LIN communication for 1 second.	IG2 relay Wire harness Power management control ECU Steering lock ECU (Steering lock actuator assembly)

WIRING DIAGRAM
CAUTION / NOTICE / HINT

HINT:

After replacing the steering lock ECU (steering lock actuator assembly), confirm the Initialization of the steering lock (See page ).

PROCEDURE

1. INSPECT NO. 2 IGNITION RELAY

(a) Remove the IG2 relay from the engine room junction block and relay block.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Specified Condition
3 - 5	10 kΩ or higher
3 - 5	Below 1 Ω (when battery voltage is applied between terminals 1 and 2)

Text in Illustration

*1

IG2 Relay

NG

REPLACE NO. 2 IGNITION RELAY

OK

1. CHECK HARNESS AND CONNECTOR (STEERING LOCK ECU - BODY GROUND)

(a) Disconnect the D17 connector from the steering lock ECU (steering lock actuator assembly).

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
D17-1 (GND) - Body ground	Always	Below 1 Ω

Text in Illustration

*1	Front view of wire harness connector (to Steering Lock ECU (Steering Lock Actuator Assembly))

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

1. CHECK HARNESS AND CONNECTOR (STEERING LOCK ECU - BATTERY)

(a) Measure the voltage according to the value(s) in the table below. Standard Voltage: Tester Connection Switch Condition Specified Condition D17-6 (IG2) - D17-1 (GND) Engine switch on (IG) 10 to 14 V

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Switch Condition	Specified Condition
*D17-6 (IG2) - D17-7 (B)	Engine switch off	10 kΩ or higher

*: This measurement is performed with the engine switch off to check for a battery voltage short in the IG2 circuit.

Text in Illustration

*1	Front view of wire harness connector (to Steering Lock ECU (Steering Lock Actuator Assembly))

OK

REPLACE STEERING LOCK ECU (STEERING LOCK ACTUATOR ASSEMBLY)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR