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Home >> Infiniti >> 2023 >> QX55 Essential >> Repair and Diagnosis (Single Page) >> Engine Performance >> Engine Control Systems >> Drive Mode System (DTC/Circuit Diagnosis) >> Circuit Diagnosis >> Drive Mode Switch Circuit >> Diagnosis Procedure
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Diagnosis Procedure

  1. CHECK DRIVE MODE SWITCH SIGNAL CIRCUIT 
    1. Ignition switch OFF.
    2. Disconnect drive mode switch harness connector and chassis control module harness connector.
    3. Check the continuity between drive mode switch harness connector and chassis control module harness connector.

      Drive mode switch

      Chassis control module

      Continuity

      Connector

      Terminal

      Connector

      Terminal

      M321

      3

      M96

      6

      Existed

      7

      5

    4. Also check harness for short to ground and to power.

    Is the inspection result normal?

    YES

    GO TO 2.

    NO

    Repair / replace harness or connector.

  2. CHECK DRIVE MODE SWITCH GROUND CIRCUIT 

    Check the continuity between drive mode switch harness connector and ground.

    Drive mode switch

    -

    Continuity

    Connector

    Terminal

    M321

    4

    Ground

    Existed

    Is the inspection result normal?

    YES

    GO TO 3.

    NO

    Repair / replace harness or connector.

  3. CHECK DRIVE MODE SWITCH 

    Check drive mode switch. Refer to Component Inspection .

    Is the inspection result normal?

    YES

    INSPECTION END

    NO

    Replace drive mode switch. Refer to Removal and Installation .