Inspection Procedure

1. Remove the D-IG1-2 fuse from the main body ECU.
2. Measure the resistance according to the value(s) in the table below.

   Standard resistance 

   FUSE (D-IG1-2)
   
   

   Tester Connection	Condition	Specified Condition
   D-IG1-2 fuse	Always	Below 1 Ω

NG: REPLACE FUSE 

OK: GO TO NEXT STEP 

1. Disconnect the A33 ECU connector.
2. Measure the voltage according to the value(s) in the table below.

   Standard voltage 

   DRIVING SUPPORT ECU - BATTERY AND BODY GROUND VOLTAGE
   
   

   Tester Connection	Condition	Specified Condition
   A33-13 (+B) - Body ground	Engine switch on (IG)	11 to 14 V
   A33-13 (+B) - Body ground	Engine switch off	Below 1 V

   Fig 1: Identifying A33 ECU Connector Terminal

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Measure the resistance according to the value(s) in the table below.

   Standard resistance 

   DRIVING SUPPORT ECU - BATTERY AND BODY GROUND RESISTANCE
   
   

   Tester Connection	Condition	Specified Condition
   A33-25 (GND) - Body ground	Always	Below 1 Ω

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE (See  PROBLEM SYMPTOMS TABLE   )