Inspection Procedure

HINT:

Start the engine before inspection. Check the IG1 relay or battery if the engine does not start.

1. INSPECT FUSE (ECU-IG LH) 
   1. Remove the ECU-IG LH fuse from the cowl side junction block LH.
   2. Measure the resistance according to the value (s) in the table below.

      Standard resistance 

      STANDARD RESISTANCE SPECIFICATIONS
      
      

      Tester Item	Condition	Specified Condition
      ECU-IG LH fuse	Always	Below 1 Ω

   Fig 1: Identifying ECU-IG LH Fuse
   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   NG: REPLACE FUSE (ECU-IG LH) 

   OK: Go to Next Step 

2. INSPECT AIR CONDITIONING AMPLIFIER (IG+ - GND) 
   1. Remove the A/C amplifier with its connectors still connected.
   2. Turn the engine switch on (IG).
   3. Measure the voltage according to the value (s) in the table below.

      Standard voltage 

      TESTER CONNECTION AND SPECIFIED CONDITION
      
      

      Tester Connection	Condition	Specified Condition
      J58-21 (IG+) - J58-20 (GND)	Engine switch on (IG)	10 to 14 V

   Fig 2: Identifying J58 Air Conditioning Amplifier Connector Terminals (IG+ - GND
   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   NG: Go to step 3 

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

3. CHECK WIRE HARNESS (AIR CONDITIONING AMPLIFIER - BATTERY) 
   1. Disconnect the A/C amplifier connector.
   2. Measure the voltage according to the value (s) in the table below.

      Standard voltage 

      TESTER CONNECTION AND SPECIFIED CONDITION
      
      

      Tester Connection	Condition	Specified Condition
      J58-21 (IG+) - Body ground	Engine switch off	Below 1 V
      	Engine switch on (IG)	10 to 14 V

   Fig 3: Identifying A/C Amplifier Connector
   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

   OK: Go to Next Step 

4. CHECK WIRE HARNESS (AIR CONDITIONING AMPLIFIER - BODY GROUND) 
   1. Disconnect the A/C amplifier connector.
   2. Measure the resistance according to the value (s) in the table below.

      Standard resistance 

      TESTER CONNECTION AND SPECIFIED CONDITION
      
      

      Tester Connection	Condition	Specified Condition
      J58-20 (GND) - Body ground	Always	Below 1 Ω

   Fig 4: Identifying A/C Amplifier Connector
   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

   OK: REPLACE AIR CONDITIONING AMPLIFIER