Combination Switch ECU Power Source Circuit: Procedure

1. Disconnect the connector from the combination switch ECU.
   Fig 1: Identifying Combination Switch (Battery) ECU Connector Terminals

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

   Voltage

   Tester connection	Condition	Specified Condition
   D13-1 - Body ground	Always	10 to 14 V

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 2: Identifying Combination Switch ECU (Ignition Switch Circuit) Connector Terminals

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   Voltage

   Tester connection	Condition	Specified Condition
   D13-2 - Body ground	Ignition switch on (IG)	10 to 14 V
   D13-2 - Body ground	Ignition switch off	Below 1 V

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Measure the resistance according to the value(s) in the table below.
   Fig 3: Identifying Combination Switch ECU (Body Ground) Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Resistance

   Tester connection	Condition	Specified Condition
   D13-5 - Body ground	Always	Below 1 Ω

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

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