DTC B2786: No Response from Steering Lock ECU: Procedure

1. Clear the DTC. Refer to DTC CHECK / CLEAR .

NEXT: Go to next step 

1. Recheck for DTCs. Refer to DTC CHECK / CLEAR .

   OK

   B2786 output does not reoccur.

NG → See step   3 

OK → See step   7 

Fig 1: Identifying Certification ECU And Steering Lock ECU Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the E84 and E77 ECU connectors.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   E84-10 (LIN) - E77-5 (LIN)	Always	Below 1 Ω
   E84-10 (LIN) or E77-5 (LIN) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Disconnect the E77 ECU connector.
   Fig 2: Identifying Steering Lock ECU Connector Terminals

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   E77-1 (GND) - Body ground	Always	Below 1 Ω

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   E77-7 (B) - Body ground	Always	11 to 14 V

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Temporarily replace the steering lock ECU with a new one. Refer to REMOVAL .
   NOTE:

   When replacing the steering lock ECU, registration must be performed according to the "Registration" procedures. Refer to REGISTRATION .

2. Clear the DTC. Refer to DTC CHECK / CLEAR .

NEXT: Go to next step 

1. Recheck for DTCs. Refer to DTC CHECK / CLEAR .

   OK

   B2786 output does not reoccur.

NG → See step   8 

OK → END (STEERING LOCK ECU IS DEFECTIVE)