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Home >> Toyota >> 2002 >> 4Runner Base >> Repair and Diagnosis >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> Automatic HVAC Systems >> Circuit Inspection >> IG Power Source Circuit >> Inspection Procedure

Inspection Procedure

  1. Check voltage between terminals IG and GND of A/C control assembly connector. 
    1. PREPARATION: 
      1. Remove A/C control assembly with connectors still connected, see AIR CONDITIONING .
      2. Turn ignition switch to ON.
    1. CHECK: 
    2. Measure voltage between terminals IG and GND of A/C control assembly.
      Fig 1: Checking Voltage Between Terminals IG & GND
      G01051385Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. OK: 
    2. Voltage : 10 - 14 V 
    1. OK: Proceed to next circuit inspection shown on problem symptoms table, see  PROBLEM SYMPTOMS TABLE  . 
    2. NG: Go to next step. 
  2. Check continuity between terminal GND of A/C control assembly and body ground. 
    1. PREPARATION: 
    2. Turn ignition switch to LOCK.
    1. CHECK: 
    2. Measure resistance between terminal GND of A/C control assembly and body ground.
    1. OK: 
    2. Resistance : Below 1 ohm 
    1. NG: Repair or replace harness or connector. 
    2. OK: Go to next step. 
    Fig 2: Measuring Resistance Between Terminals GND Of A/C
    G01051386Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. Check GAUGE fuse. 
    1. PREPARATION: 
    2. Remove GAUGE fuse from No. 1 J/B.
      Fig 3: Identifying Gauge Fuse No. 1 J/B
      G01051387Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. CHECK: 
    2. Check continuity of GAUGE fuse.
    1. OK: 
    2. Continuity exists. 
    1. NG: Check for shot in all the harness and components connected to the GAUGE fuse, see  INTRODUCTION  . 
    2. OK: Check and repair harness and connector between A/C control assembly and battery. 
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