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Home >> Lexus >> 2007 >> LS 460L >> Repair and Diagnosis >> External Pages >> Different car >> Section 640 (Security Control System) >> Component Diagnosis >> B261A Push-Button Ignition Switch >> Diagnosis Procedure
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Diagnosis Procedure

WARNING: This page is about a different car, the 2009 Nissan Maxima. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK PUSH-BUTTON IGNITION SWITCH OUTPUT SIGNAL 1
    1. Turn ignition switch OFF.
    2. Disconnect push-button ignition switch harness connector and IPDM E/R harness connector.
    3. Check voltage between push-button ignition switch harness connector and ground.
      VOLTAGE REFERENCE CHART

      Push-button ignition switch Ground Voltage (V)
      Connector Terminal
      M38 4 Ground Battery voltage
      Fig 1: Checking Voltage Between Push-Button Ignition Switch Harness Connector And Ground
      G05691868Courtesy of NISSAN MOTOR CO., U.S.A.

      Is the inspection result normal? 

      YES: GO TO  4

      NO: GO TO 2

  2. CHECK PUSH-BUTTON IGNITION SWITCH CIRCUIT
    1. Disconnect BCM harness connector.
    2. Check continuity between push-button ignition switch harness connector M38 (A) terminal 4 and BCM harness connector M19 (B) terminal 77.
      CONTINUITY REFERENCE CHART

      Push-button ignition switch BCM Continuity
      Connector Terminal Connector Terminal
      A: M38 4 B: M19 77 Yes
    3. Check continuity between push-button ignition switch harness connector M38 (A) terminal 4 and ground.
      CONTINUITY REFERENCE CHART

      Push-button ignition switch Ground Continuity
      Connector Terminal
      A: M38 4 Ground No
      Fig 2: Checking Continuity Between Push-Button Ignition Switch Harness Connector M38 Terminal 4 And Ground
      G05046626Courtesy of NISSAN MOTOR CO., U.S.A.

      Is the inspection result normal? 

      YES: GO TO 3

      NO: Repair harness or connector.

  3. CHECK PUSH-BUTTON IGNITION SWITCH
    1. Disconnect IPDM E/R harness connector.
    2. Check continuity between push-button ignition switch harness connector M38 (A) terminal 4 and IPDM E/R harness connector E18 (B) terminal 28.
      CONTINUITY REFERENCE CHART

      Push-button ignition switch IPDM E/R Continuity
      Connector Terminal Connector Terminal
      A: M38 4 B: E18 28 Yes
    3. Check continuity between push-button ignition switch harness connector and ground.
      CONTINUITY REFERENCE CHART

      Push-button ignition switch Ground Continuity
      Connector Terminal
      A: M38 4 Ground No
      Fig 3: Checking Continuity Between Push-Button Ignition Switch Harness Connector And Ground
      G05046628Courtesy of NISSAN MOTOR CO., U.S.A.

      Is the inspection result normal? 

      YES: GO TO 4

      NO: Repair harness or connector.

  4. CHECK INTERMITTENT INCIDENT

    Refer to "INTERMITTENT INCIDENT ".

    Inspection End.

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