DTC B2788: IG2 Signal Malfunction [03/2017 - ]: Procedure

1. Disconnect the D59 steering lock actuator assembly (steering lock ECU) connector.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   D59-1 (GND) - Body ground	Always	Below 1 Ω

3. Reconnect the D59 steering lock actuator assembly (steering lock ECU) connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

4. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   D59-6 (IGN1) - D59-1 (GND)	Engine switch on (IG)	11 to 14 V
   	Engine switch off	Below 1 V

   TEXT IN ILLUSTRATION
   
   

   *a	Component with harness connected (Steering Lock Actuator Assembly (Steering Lock ECU))

Result: 

OK 

REPLACE STEERING LOCK ACTUATOR ASSEMBLY (STEERING LOCK ECU). Refer to  DISASSEMBLY [03/2017 - ] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR