Inspection Procedure

1. Delete the DTCs (See DTC CHECK / CLEAR ).
2. After all DTCs are cleared, check if the trouble occurs again 5 seconds after the power switch is turned on (IG).
3. Check for DTCs again.

OK: 

DTC B2287, DTC B2781 and DTC B2785 are not output. 

HINT:

• If DTC B2271 is output (See DTC B2271 IGNITION HOLD MONITOR MALFUNCTION ).
• If DTC B2287 is output (See DTC B2287 LIN COMMUNICATION MASTER MALFUNCTION ).
• If DTC B2785 is output (See DTC B2785 COMMUNICATION MALFUNCTION BETWEEN ECUS CONNECTED BY LIN ).

NG:  Go to DTC CHART 

OK: Go to Next Step 

1. Disconnect the E7 and E51 ECU connectors
   Fig 1: Identifying Wire Harness (Main Body ECU - Steering Lock ECU)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance according to the value (s) in the table below.

Standard resistance 

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to Next Step 

1. After replacing the main body ECU with a normally functioning ECU, check that the steering lock/unlock function operates normally.

   OK: 

   Steering lock/unlock function operates normally. 

   HINT:

   If steering lock/unlock function does not operate, refer to problem symptoms table of the electrical steering lock (steering wheel cannot be unlocked) (See PROBLEM SYMPTOMS TABLE ).

NG:  Go to ELECTRIC STEERING LOCK

OK: END (MAIN BODY ECU DEFECTIVE)