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Home >> Lexus >> 2007 >> SC 430 >> Repair and Diagnosis >> Electrical >> Gauges >> Meter >> Meter / Gauge System >> Entire Combination Meter does not Operate >> Inspection Procedure

Inspection Procedure

  1. INSPECT FUSE (D-IG, AM1, MPX-B2, D/C CUT) 
    1. Remove the AM1 and D-IG fuses from the driver side junction block.
    2. Remove the D/C CUT fuse from the engine room No. 1 relay block.
    3. Remove the MPX-B2 fuse from the passenger side junction block.
    4. Measure the resistance of the fuses.

      Standard resistance: 

      Below 1 Ω 

    NG: REPLACE FUSE 

    OK: Go to next step 

  2. INSPECT IG1 RELAY 
    Fig 1: Inspecting IG1 Relay
    G05292994Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Remove the relay from the driver side junction block.
    2. Measure the resistance of the relay.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Specified Condition
      3 - 5 10 kΩ or higher
      3 - 5 Below 1 Ω (when battery voltage is applied to terminals 1 and 2)

    NG: REPLACE IG1 RELAY 

    OK: Go to next step 

  3. CHECK WIRE HARNESS (METER - BATTERY AND BODY GROUND) 
    1. Disconnect C8 meter connector.
      Fig 2: Identifying C8 Meter Connector Terminals
      G05292995Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage of the wire harness side connector.

      Standard voltage 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Specified Condition
      C8-13 (B) - Body ground 10 to 14 V
    3. Measure the resistance of the wire harness side connector.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Specified Condition
      C8-12 (ES) - Body ground Below 1 Ω

    NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 

    OK: Go to next step 

  4. CHECK WIRE HARNESS (IG1 RELAY - METER, BATTERY AND BODY GROUND) 
    1. Remove the IG1 relay from the driver side junction block.
      Fig 3: Identifying IG1 Relay
      G05292996Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect the C8 meter connector.
    3. Measure the voltage of the wire harness connectors.

      Standard voltage 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      IG1 relay terminal 1 - Body ground Ignition switch ON 10 to 14 V
      IG1 relay terminal 5 - Body ground Always 10 to 14 V
    4. Measure the resistance of the wire harness connectors.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Specified Condition
      IG1 relay terminal 3 - C8-1 (IG+) Below 1 Ω
      IG1 relay terminal 2 - Body ground Below 1 Ω

    NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 

    OK: REPLACE COMBINATION METER ASSEMBLY 

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