DTC B2788: IG2 Signal Malfunction: Procedure

1. Remove the IG2 relay from the engine room relay block.
   Fig 1: Inspecting IG2 Relay 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
   3 - 5	Always	10 kΩ or higher
   3 - 5	When battery voltage is applied to terminals 1 and 2	Below 1 Ω

NG → REPLACE NO. 2 IGNITION RELAY (IG2) 

OK: Go to next step 

1. Disconnect the E39 connector from the steering lock actuator assembly.
   Fig 2: Identifying E39 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
   E39-1 (GND) - Body ground	Always	Below 1 Ω
   E39-2 (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 E39 Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   E39-6 (IG2) - E39-1 (GND)	Engine switch on (IG)	11 to 14 V
   E39-6 (IG2) - E39-2 (SGND)	Engine switch on (IG)	11 to 14 V

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

   Standard Resistance

   Tester Connection	Switch Condition	Specified Condition
   *E39-6 (IG2) - E39-7 (B)	Engine switch off	10 kΩ or higher

   *: This measurement is performed with the engine switch off to check for a short between IG2 and battery.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (STEERING LOCK ACTUATOR ASSEMBLY - BATTERY) 

OK → See step   4