DTC B2788: IG2 Signal Malfunction [09/2014 - 01/2023]: Procedure

1. Make sure that there is no looseness at the locking part and the connecting part of the connector.
2. Disconnect the O27 steering lock ECU (steering lock actuator assembly) connector.
3. Measure the resistance according to the value(s) in the table below.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Front view of wire harness connector (to Steering Lock ECU (Steering Lock Actuator Assembly))

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   O27-1 (GND) - Body ground	Always	Below 1 Ω

4. Reconnect the O27 steering lock ECU (steering lock actuator assembly) connector.
5. Measure the voltage according to the value(s) in the table below.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   O27-6 (IG2) - O27-1 (GND)	Engine switch on (IG)	11 to 14 V
   O27-6 (IG2) - O27-1 (GND)	Engine switch off	Below 1 V

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE STEERING LOCK ECU (STEERING LOCK ACTUATOR ASSEMBLY). Refer to  DISASSEMBLY [09/2014 - 03/2019]  , or refer to  DISASSEMBLY [03/2019 - 01/2023] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR