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Home >> Infiniti >> 2018 >> Q70 5.6 Luxe, RWD >> Repair and Diagnosis >> Body & Frame >> Door Locks >> Door Lock (DTC/Circuit Diagnosis) (Except Hybrid) >> DTC/Circuit Diagnosis >> Door Key Cylinder Switch >> Diagnosis Procedure

Diagnosis Procedure

  1. CHECK DOOR KEY CYLINDER SWITCH INPUT SIGNAL 
    1. Turn Ignition Switch OFF.
    2. Disconnect Front Door Lock Assembly (Driver Side) connector.
    3. Check voltage between Front Door Lock Assembly (Driver Side) harness connector and ground.

      (+)

      (-)

      Voltage

      (Approx.)

      Front Door Lock Assembly (Driver Side)

      Connector

      Terminal

      D15

      5

      Ground

      5 V

      6

    Is the inspection result normal?

    YES

    GO TO 3.

    NO

    GO TO 2.

  2. CHECK DOOR KEY CYLINDER SWITCH SIGNAL CIRCUIT 
    1. Disconnect power window main switch connector.
    2. Check continuity between power window main switch harness connector and Front Door Lock Assembly (Driver Side) harness connector.

      Power window main switch

      Front Door Lock Assembly (Driver Side)

      Continuity

      Connector

      Terminal

      Connector

      Terminal

      D22

      15

      D15

      6

      Existed

      16

      5

    3. Check continuity between power window main switch harness connector and ground.

      Power window main switch

      Ground

      Continuity

      Connector

      Terminal

      D22

      15

      Not existed

      16

    Is the inspection result normal?

    YES

    Replace power window main switch. Refer to Removal and Installation .

    NO

    Repair or replace harness.

  3. CHECK DOOR KEY CYLINDER SWITCH GROUND CIRCUIT 

    Check continuity between Front Door Lock Assembly (Driver Side) harness connector and ground.

    Front Door Lock Assembly (Driver Side)

    Ground

    Continuity

    Connector

    Terminal

    D15

    4

    Existed

    Is the inspection result normal?

    YES

    GO TO 4.

    NO

    Repair or replace harness.

  4. CHECK DOOR KEY CYLINDER SWITCH 

    Refer to Component Inspection .

    Is the inspection result normal?

    YES

    GO TO 5.

    NO

    Replace Front Door Lock Assembly (Driver Side).

  5. CHECK INTERMITTENT INCIDENT 

    Refer to Intermittent Incident .

    INSPECTION END