Toyota Venza Quiz
Door Lock

Wireless Door Lock Tuner Circuit Malfunction (B1242)

In this manual: Door Lock
Introduction — 15Maintenance — 8Audio / Video — 102Garage Door Opener — 8Navigation / Multi Info Display — 81Park Assist / Monitoring — 50Brake (front) — 7Brake (rear) — 7Brake Control / Dynamic Control Systems — 79Brake System (other) — 28Parking Brake — 22Axle And Differential — 44Drive Shaft / Propeller Shaft — 24Mf1a Transfer / 4wd / Awd — 46U660e Automatic Transmission / Transaxle — 1241ar-fe Cooling — 311ar-fe Emission Control — 101ar-fe Engine Control — 1331ar-fe Engine Mechanical — 441ar-fe Fuel — 311ar-fe Intake / Exhaust — 211ar-fe Lubrication — 111ar-fe Starting — 16Cruise Control — 241ar-fe Battery / Charging — 162gr-fe Battery / Charging — 17Networking — 67Power Distribution — 8Power Assist Systems — 34Steering Column — 37Steering Gear / Linkage — 29Alignment / Handling Diagnosis — 4Front Suspension — 39Rear Suspension — 35Tire / Wheel — 4Tire Pressure Monitoring — 35Door / Hatch — 83Exterior Panels / Trim — 56Horn — 4Lighting (ext) — 89Mirror (ext) — 36Sliding Roof / Convertible — 26Window / Glass — 87Wiper / Washer — 30Door Lock — 85Heating / Air Conditioning — 82Interior Panels / Trim — 20Lighting (int) — 37Meter / Gauge / Display — 41Mirror (int) — 9Power Outlets (int) — 10Seat — 84Seat Belt — 43Supplemental Restraint Systems — 131Theft Deterrent / Keyless Entry — 155
~2min read
DESCRIPTION

The door control receiver receives signals from the transmitter and sends these signals to the main body ECU (driver side junction block assembly).

DTC No.

DTC Detection Condition

Trouble Area

B1242

In diagnostic mode, an applicable RDA signal cannot be received within 2.4 seconds after a PRG signal has been output from the main body ECU (driver side junction block assembly).
  • Wire harness or connector
  • Door control receiver
  • Main body ECU (Driver side junction block assembly)
WIRING DIAGRAM
PROCEDURE

  1. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - DOOR CONTROL RECEIVER)

(a) Disconnect the D49 main body ECU connector and the M15 door control receiver connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

D49-12 (RDA) - M15-2 (RDA)

Always

Below 1 Ω

D49-12 (RDA) - Body ground

Always

10 kΩ or higher

D49-10 (PRG) - M15-3 (PRG)

Always

Below 1 Ω

D49-10 (PRG) - Body ground

Always

10 kΩ or higher
Text in Illustration

*1

Front view of wire harness connector

(to Main Body ECU (Driver Side Junction Block Assembly))

*2

Front view of wire harness connector

(to Door Control Receiver)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

  1. CHECK HARNESS AND CONNECTOR (BATTERY, BODY GROUND)

(a) Measure the voltage and resistance according to the value(s) in the table below.

Standard:

Tester Connection

Condition

Specified Condition

M15-1 (GND) - Body ground

Always

Below 1 Ω

M15-5 (+B) - Body ground

Always

11 to 14 V
Text in Illustration

*1

Front view of wire harness connector

(to Door Control Receiver)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

  1. REPLACE DOOR CONTROL RECEIVER

(a) Temporarily replace the door lock control receiver with a new or known good one (See page ).


NEXT

  1. REGISTER RECOGNITION CODE

(a) Perform the Registration procedure (See page ).


NEXT

  1. CONFIRM DTC

(a) Clear the DTCs (See page ).


(b) Recheck for DTCs.

Result

Proceed to

DTC is not output

A

DTC is output

B

A

END (DOOR CONTROL RECEIVER WAS DEFECTIVE)

B

REPLACE MAIN BODY ECU (DRIVER SIDE JUNCTION BLOCK ASSEMBLY)

Test yourself

A quick Toyota Venza quiz: every answer comes with an explanation and a link to the manual page.