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Home >> Lexus >> 2021 >> LS 500 Base, AWD >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Meter / Gauge System - Diagnostic Codes (2 Of 2), Circuit & Symptom Tests >> Meter / Gauge System >> Steering Pad Switch Circuit [10/2023 - ] >> Procedure

Steering Pad Switch Circuit [10/2023 - ]: Procedure

  1. INSPECT STEERING PAD SWITCH ASSEMBLY 
    1. Remove the steering pad switch assembly.

      Refer to REMOVAL [10/2023 - ]

    2. Inspect the steering pad switch assembly.

      Refer to INSPECTION [10/2023 - ]

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE STEERING PAD SWITCH ASSEMBLY. Refer to  REMOVAL [10/2023 - ] 

    Result: 

    OK 

    See step  2

  2. INSPECT SPIRAL WITH SENSOR CABLE SUB-ASSEMBLY 
    1. Remove the spiral with sensor cable sub-assembly.

      Refer to REMOVAL [10/2023 - ]

    2. Inspect the spiral with sensor cable sub-assembly.

      Refer to INSPECTION [12/2017 - ]

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE SPIRAL CABLE WITH SENSOR SUB-ASSEMBLY. Refer to  REMOVAL [10/2023 - ] 

    Result: 

    OK 

    See step  3

  3. CHECK HARNESS AND CONNECTOR (SPIRAL WITH SENSOR CABLE SUB-ASSEMBLY - COMBINATION METER ASSEMBLY) 
    1. Disconnect the G208 combination meter assembly connector.
    2. Disconnect the G27 spiral with sensor cable sub-assembly connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      G208-29 (MSM+) - G27-11 (+DP) Always Below 1 Ω
      G208-12 (MSTI) - G27-10 (+DP2) Always Below 1 Ω
      G208-29 (MSM+) - Other terminals and body ground Always 10 kΩ or higher
      G208-12 (MSTI) - Other terminals and body ground Always 10 kΩ or higher
      G27-4 (EAU) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  4

  4. CHECK COMBINATION METER ASSEMBLY 
    1. Disconnect the G27 spiral with sensor cable sub-assembly connector.
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      G27-10 (+DP2) - Body ground Always 4.3 to 5.2 V
      G27-11 (+DP) - Body ground Always 4.3 to 5.2 V

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE RADIO RECEIVER ASSEMBLY. Refer to  REMOVAL [10/2022 - ] 

    Result: 

    NG 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [10/2023 - ]