Inspection Procedure

1. Remove the ACC fuse from the main body ECU.
2. Remove the RAD NO. 1 fuse from the engine room relay block.
3. Measure the resistance according to the value (s) in the table below.

   Standard Resistance 

   STANDARD RESISTANCE
   
   

   Tester Connection	Condition	Specified Condition
   ACC fuse	Always	Below 1 Ω
   RAD NO. 1 fuse	Always	Below 1 Ω

NG: REPLACE FUSE 

OK: Go to next Step 

1. Disconnect the L37 tuner connector.
2. Measure the resistance according to the value (s) in the table below.

   Standard Resistance 

   STANDARD RESISTANCE
   
   

   Tester Connection	Condition	Specified Condition
   L37-7 (GND) - Body ground	Always	Below 1 Ω

3. Measure the voltage according to the value (s) in the table below.
   Fig 1: Identifying L37 Tuner Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Voltage 

   STANDARD VOLTAGE
   
   

   Tester Connection	Condition	Specified Condition
   L37-12 (+B) - L37-7 (GND)	Always	11 to 14 V
   L37-11 (ACC) - L37-7 (GND)	Engine switch on (ACC)	11 to 14 V

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

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