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Home >> Nissan-Datsun >> 2004 >> Altima S, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 1098 (Automatic Drive Positioner) >> DTC/Circuit Diagnosis >> DTC B2126: Detent SW >> Diagnosis Procedure

Diagnosis Procedure

WARNING: This page is about a different car, the 2012 Nissan Pathfinder. However, it is still accessible from the selected car via links, so may be relevant.

Regarding Wiring Diagram information, refer to "WIRING DIAGRAM ".

  1. CHECK DTC

    Check "Self diagnostic result" for BCM with CONSULT.

    Are other DTCs detected? 

    YES: Check The DTC.

    NO: GO TO 2

  2. CHECK PARK POSITION SWITCH SIGNAL
    1. Turn ignition switch ON.
    2. Select "P POSI SW" in "Data Monitor" mode with CONSULT.
    3. Check park position switch signal under the following condition.
      Monitor item Condition Status
      P POSI SW A/T selector lever P position OFF
      Other than above ON

      Is the status normal? 

      YES: A/T shift selector (park position switch) circuit is OK.

      NO: GO TO 3

  3. CHECK A/T SHIFT SELECTOR (PARK POSITION SWITCH) HARNESS
    1. Turn ignition switch OFF.
    2. Disconnect A/T shift selector and driver seat control unit.
    3. Check continuity between A/T shift selector connector M158 (A) terminal 4 and driver seat control unit connector B202 (B) terminal 21.

      4 - 21: Continuity should exist  .

    4. Check continuity between A/T shift selector connector M158 (A) terminal 4 and ground.

      4 - Ground: Continuity should not exist  .

      Fig 1: Checking Continuity Between A/T Shift Selector Connector M158 Terminal 4 And Ground
      G06606215Courtesy of NISSAN NORTH AMERICA, INC.

      Is the inspection result normal? 

      YES: GO TO 4

      NO: Repair or replace harness.

  4. CHECK PARK POSITION SWITCH

    Check continuity between A/T shift selector (park position switch) terminals as follows.

    Terminals Condition Continuity
    2 4 P position Yes
    Other than P position No
    Fig 2: Checking Continuity Between A/T Shift Selector (Park Position Switch) Terminals 2 And 4
    G06606216Courtesy of NISSAN NORTH AMERICA, INC.

    Is the inspection result normal? 

    YES: GO TO 5

    NO: Replace A/T shift selector. Refer to "REMOVAL AND INSTALLATION ".

  5. CHECK INTERMITTENT INCIDENT

    Refer to "INTERMITTENT INCIDENT ".

    Is the inspection result normal? 

    YES: Replace driver seat control unit. Refer to "EXPLODED VIEW ".

    NO: Repair or replace the malfunctioning part.