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Home >> Lexus >> 2005 >> SC 430 >> Repair and Diagnosis >> Electrical >> Gauges >> Combination Meter - Diagnostics >> Entire Combination Meter Does Not Operate >> Inspection Procedure
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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 J/B.
    2. Remove the D/C CUT fuse from the engine room No. 1 R/B.
    3. Remove the MPX-B2 fuse from the passenger side J/B.
    4. Measure the resistance of the fuses.

      Standard: Below 1 Ω 

    1. NG: REPLACE FUSE 
    2. OK: Go to next step. 
  2. INSPECT RELAY (Marking: IG1) 
    1. Remove the relay from the driver side J/B.
    2. Measure the resistance of the relay.

      Standard: 

      RELAY (MARKING: IG1)

      Tester Connection Specified Condition
      3 - 5 10 k ohms or higher
      3 - 5 Below 1 ohms (when battery voltage is applied to terminals 1 and 2)
      Fig 1: Inspecting Relay (IG1)
      G02956775Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG: REPLACE RELAY 
    2. OK: Go to next step. 
  3. CHECK WIRE HARNESS (COMBINATION METER ASSY - BATTERY AND BODY GROUND) 
    1. Disconnect C8 meter connector.
    2. Measure the voltage and resistance of the wire harness side connector.

      Standard: 

      COMBINATION METER ASSY - BATTERY AND BODY GROUND

      Tester Connection Specified Condition
      C8-11 (ES) - Body ground Below 1 ohms
      C8-12 (B) - Body ground 10 to 14 V
      Fig 2: Checking Wire Harness (Combination Meter - Battery And Body Ground)
      G02956776Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 
    2. OK: Go to next step. 
  4. CHECK WIRE HARNESS (DRIVER SIDE J/B - BATTERY AND BODY GROUND) 
    1. Remove the IG1 relay from the driver side J/B.
    2. Disconnect the C8 meter connector.
    3. Measure the voltage and resistance of the wire harness connectors.

      Standard: 

      DRIVER SIDE J/B - BATTERY AND BODY GROUND

      Tester Connection Condition Specified Condition
      J/B IG1 relay terminal 3 - C8-1 (IG)+ Always Below 1 ohms
      J/B IG1 relay terminal 2 - Body ground Always Below 1 ohms
      J/B IG1 relay terminal 1 - Body ground Ignition switch ON 10 to 14 V
      J/B IG1 relay terminal 5 - Body ground Always 10 to 14 V
      Fig 3: Checking Wire Harness (Driver Side J/B - Battery And Body Ground)
      G02956777Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 
    2. OK: REPLACE COMBINATION METER ASSY (See  COMBINATION METER ASSY 
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