DTC B2788: IG2 Signal Malfunction [10/2018 - 07/2022]: Procedure

1. Disconnect the F45 steering lock ECU (steering lock actuator or upper bracket assembly) connector.
2. Measure the voltage 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 or Upper Bracket Assembly))

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   F45-6 (IG2) - Body ground	Engine switch on (IG)	11 to 14 V
   F45-6 (IG2) - Body ground	Engine switch off	Below 1 V

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  2

1. 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 or Upper Bracket Assembly))

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   F45-1 (GND) - Body ground	Always	Below 1 Ω

   Result

   Result	Proceed to
   OK (for Power Tilt and Power Telescopic Steering Column)	A
   OK (for Manual Tilt and Manual Telescopic Steering Column)	B
   NG	C

Result: 

A 

REPLACE STEERING LOCK ECU (STEERING LOCK ACTUATOR OR UPPER BRACKET ASSEMBLY). Refer to  DISASSEMBLY [10/2018 - 07/2022] 

Result: 

B 

REPLACE STEERING LOCK ECU (STEERING LOCK ACTUATOR OR UPPER BRACKET ASSEMBLY). Refer to  DISASSEMBLY [10/2018 - 07/2022] 

Result: 

C 

REPAIR OR REPLACE HARNESS OR CONNECTOR