DTC B2788: IG2 Signal Malfunction: Procedure

1. Remove the IG2 relay from the No. 2 engine room junction block and relay block.
   Fig 1: Identifying Ignition Relay No. 2

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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.
   Fig 2: Identifying Steering Lock Actuator Assembly Connector Terminals

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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.
   Fig 3: Identifying Steering Lock Actuator Assembly Connector Terminals

   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

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 → See step   4