DTC B2788: IG2 Signal Malfunction [08/2015 - 08/2019]: Procedure

1. Disconnect the G23 steering lock ECU connector.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   G23-1 (GND) - Body ground	Always	Below 1 Ω

3. Reconnect the G23 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
   G23-6 (IG2) - G23-1 (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 ECU)

Result: 

OK 

REPLACE STEERING LOCK ACTUATOR ASSEMBLY (STEERING LOCK ECU) 

(Refer to DISASSEMBLY [08/2015 - 08/2019] )

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR