DTC B2788: IG2 Signal Malfunction: Procedure

1. Disconnect the F37 connector from the steering lock ECU.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   F37-1 (GND) - Body ground	Always	Below 1 Ω

   TEXT IN ILLUSTRATION
   
   

   *1	Front view of wire harness connector (to Steering Lock ECU)

3. Reconnect the F37 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
   F37-6 (IG2) - F37-1 (GND)	Engine switch on (IG)	11 to 14 V
   F37-6 (IG2) - F37-1 (GND)	Engine switch off	Below 1 V

   TEXT IN ILLUSTRATION
   
   

   *1	Component with harness connected (Steering Lock ECU)

NG → CHECK FOR SHORT IN ALL HARNESSES AND CONNECTORS CONNECTED TO FUSE AND REPLACE FUSE 

OK → See step   2