Inspection Procedure

1. Disconnect the ECU-B and ACC fuses from the driver side junction block.
2. Measure the resistance of the fuses.

   Standard resistance: 

   Below 1 Ω 

NG: REPLACE FUSE 

OK: Go to next step 

1. Disconnect the M13 connector.
2. Measure the resistance of the wire harness side connector.

   Standard resistance 

   STANDARD RESISTANCE
   
   

   Tester Connection	Specified Condition
   M13-1 (GND1) - Body ground*1	Below 1 Ω
   M13-3 (GND1) - Body ground*2	Below 1 Ω

3. Measure the voltage of the wire harness side connector.
   Fig 1: Identifying M13 Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard voltage 

   STANDARD VOLTAGE
   
   

   Tester Connection	Condition	Specified Condition
   M13-2 (ACC) - Body ground*1	Power switch ON (ACC)	10 to 14 V
   M13-3 (+B1) - Body ground*1	Always	10 to 14 V
   M13-11 (ACC) - Body ground*2	Power switch ON (ACC)	10 to 14 V
   M13-12 (+B1) - Body ground*2	Always	10 to 14 V
   HINT: *1: for 4 Connector type *2: for 3 Connector type

NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 

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