B2786

STEERING COLUMN: STEERING LOCK SYSTEM: B2786: No Response from Steering Lock ECU
B2786 - No Response from Steering Lock ECU

DESCRIPTION

This DTC is stored when LIN communication between the certification ECU and steering lock actuator assembly (steering lock ECU) stops for 10 seconds or more.





WIRING DIAGRAM





INSPECTION PROCEDURE

HINT
When the engine switch off, the main body ECU may occasionally go into a non-active state called sleep mode. Therefore, before proceeding with the inspection, it is necessary to perform the following steps to wake up the ECU:

With the engine switch off, open the driver door. Then (with the engine switch still off) open and close any door several times at 1.5 second intervals.

DTC B2785 is stored when the communication between the steering lock ECU and certification ECU stops.

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 DTCs Reading and Clearing Diagnostic Trouble Codes.

OK:

B2786 output does not reoccur.

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

OK -- USE SIMULATION METHOD TO CHECK Electronic Circuit Inspection Procedure

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





(a) Disconnect the E84 and E77 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 STEERING LOCK ECU (BATTERY VOLTAGE AND BODY GROUND)

(a) Disconnect the E77 ECU connector.





(b) 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 ACTUATOR ASSEMBLY (STEERING LOCK ECU)

(a) Temporarily replace the steering lock ECU with a new one Removal.

NOTICE:
When replacing the steering lock ECU, registration must be performed according to the "Registration" procedures Engine Immobiliser System (W/ Smart Key System).

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

NEXT -- Continue to next step.

6. CHECK FOR DTC

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

OK:

B2786 output does not reoccur.

NG -- REPLACE ECU AGGREGATION BOX ASSEMBLY (CERTIFICATION ECU) Removal

OK -- END (STEERING LOCK ECU IS DEFECTIVE)