Inspection Procedure

HINT:

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

If the engine still does not start, see the SFI system (see HOW TO PROCEED WITH TROUBLESHOOTING or HOW TO PROCEED WITH TROUBLESHOOTING ).

1. INSPECT FUSE (HTR) 
   1. Remove the HTR fuse from the driver side J/B.
   2. Measure the resistance according to the value(s) in HTR FUSE RESISTANCE  .

      Standard: 

      HTR FUSE RESISTANCE
      
      

      Tester item	Condition	Specified condition
      HTR fuse	Always	Below 1 Ω

   1. NG: CHECK FOR SHORT IN ALL HARNESS AND COMPONENTS CONNECTED FAILURE FUSE 
   2. OK: Go to Next Step. 
2. INSPECT AIR CONDITIONING AMPLIFIER (IG+ - BODY GROUND) 
   1. Remove the A/C amplifier assy with the connectors still connected.
   2. Turn the ignition switch to the ON position.
   3. Measure the voltage according to the value(s) in AIR CONDITIONING AMPLIFIER (IG+ - BODY GROUND) VOLTAGE  .

      Standard: 

      AIR CONDITIONING AMPLIFIER (IG+ - BODY GROUND) VOLTAGE
      
      

      Tester connection	Condition	Specified condition
      A11-19 (IG+) - Body ground	Ignition switch ON	10 to 14 V

      Fig 1: Inspecting Air Conditioning Amplifier (IG+ - Body Ground)

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   1. NG: Go to step   3 
   2. OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE (SEE  TERMINALS OF ECU  ) 
3. CHECK HARNESS AND CONNECTOR (A/C AMPLIFIER ASSY - BATTERY) (SEE  ELECTRONIC CIRCUIT INSPECTION PROCEDURE  ) 
   1. Measure the resistance according to the value(s) in Fig 2 .

      Standard: 

      Fig 2: Checking Harness & Connector (A/C Amplifier Assy - Battery) (1 Of 2)

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Fig 3: Checking Harness & Connector (A/C Amplifier Assy - Battery) (2 Of 2)

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   1. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 
   2. OK: Go to Next Step. 
4. CHECK HARNESS AND CONNECTOR (A/C AMPLIFIER - BODY GROUND) (SEE  ELECTRONIC CIRCUIT INSPECTION PROCEDURE  ) 
   1. Measure the resistance according to the value(s) in A/C AMPLIFIER - BODY GROUND RESISTANCE  .

      Standard: 

      A/C AMPLIFIER - BODY GROUND RESISTANCE
      
      

      Tester connection	Condition	Specified condition
      A11-1 (GND) - Body ground	Always	Below 1 Ω

      Fig 4: Checking Harness & Connector (A/C Amplifier - Body Ground)

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   1. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 
   2. OK: REPLACE AIR CONDITIONING AMPLIFIER (SEE  OVERHAUL  )