LIN Communication System

NETWORKING: LIN COMMUNICATION SYSTEM: B2786: No Response from Steering Lock ECU
B2786 - No Response from Steering Lock ECU

DESCRIPTION

This DTC is output when LIN communication between the certification ECU (smart key ECU assembly) and the steering lock ECU (steering lock actuator assembly) stops for more than 10 seconds.

WIRING DIAGRAM

INSPECTION PROCEDURE

NOTICE:
- If the certification ECU (smart key ECU assembly) is replaced, register the keys and ECU communication ID Engine Immobiliser System (W/ Smart Key System).
- If the steering lock ECU (steering lock actuator assembly) is replaced, register the ECU code Engine Immobiliser System (W/ Smart Key System).

PROCEDURE

1. CLEAR DTC

(a) Clear the DTC Reading and Clearing Diagnostic Trouble Codes.

NEXT -- Continue to next step.

2. CHECK FOR DTC

(a) Recheck for the DTC Reading and Clearing Diagnostic Trouble Codes.

OK:

B2786 is not output.

NG -- CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - STEERING LOCK ECU)

OK -- USE SIMULATION METHOD TO CHECK How To Proceed With Troubleshooting

3. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - STEERING LOCK ECU)

(a) Disconnect the E36 and E39 ECU connectors.

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

Standard Resistance:

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

4. CHECK HARNESS AND CONNECTOR (STEERING LOCK ECU BATTERY VOLTAGE AND GROUND)

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

Standard Resistance:

Standard Voltage:

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

5. REPLACE STEERING LOCK ECU

(a) Replace the steering lock ECU (steering lock actuator assembly).

NEXT -- Continue to next step.

6. CHECK FOR DTC

(a) Clear the DTC Reading and Clearing Diagnostic Trouble Codes.

(b) Recheck for the DTC.

OK:

B2786 is not output.

NG -- REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) Removal

OK -- END (STEERING LOCK ECU IS DEFECTIVE)