DTC B2788: IG2 Signal Malfunction: Procedure

1. Remove the IG2 relay from the engine room No. 2 junction block and relay block.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

   Tester Connection	Specified Condition
   3 - 5	10 kΩ or higher
   3 - 5	Below 1 Ω (when battery voltage is applied to terminals 1 and 2)

NG → REPLACE NO. 2 IGNITION RELAY 

OK: Go to next step 

1. Disconnect the J29 connector from the steering lock actuator assembly.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   TEXT IN ILLUSTRATION
   
   

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

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

   Tester Connection	Condition	Specified Condition
   J29-1 (GND) - Body ground	Always	Below 1 Ω
   J29-2 (SGND) - Body ground	Always	Below 1 Ω

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

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

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   STANDARD VOLTAGE
   
   

   Tester Connection	Switch Condition	Specified Condition
   J29-6 (IG2) - J29-1 (GND)	Engine switch on (IG)	10 to 14 V
   J29-6 (IG2) - J29-2 (SGND)	Engine switch on (IG)	10 to 14 V

   TEXT IN ILLUSTRATION
   
   

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

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

   Tester Connection	Switch Condition	Specified Condition
   *J29-6 (IG2) - J29-7 (B)	Engine switch off	10 kΩ or higher

   *: This measurement is performed with the engine switch off to check for a battery voltage short in the IG2 circuit.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → REPLACE STEERING LOCK ACTUATOR ASSEMBLY (STEERING LOCK ECU)