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Home >> Lexus >> 2007 >> LS 460L >> Repair and Diagnosis >> External Pages >> Different car >> Section 745 (Engine Control System - DTCS P1225 To P2138) >> DTC P1564: ASCD Steering Switch >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2005 Nissan Titan. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK GROUND CONNECTIONS 
    1. Turn ignition switch OFF.
    2. Loosen and retighten three ground screws on the body.

      Refer to "GROUND INSPECTION ".

      Fig 1: Loosening Ground Screws
      G03601956Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    1. OK: GO TO 2.
    2. NG: Repair or replace ground connections.
  2. CHECK ASCD STEERING SWITCH CIRCUIT 

    With CONSULT-II 

    1. Turn ignition switch ON.
    2. Select "MAIN SW", "CANCEL SW", "RESUME/ACC SW" and "SET SW" in "DATA MONITOR" mode with CONSULT-II.
    3. Check each item indication under the following conditions.
      SWITCH REFERENCE CHART

      Switch MONITOR ITEM Condition Indication
      MAIN switch MAIN SW Pressed ON
      Released OFF
      CANCEL switch CANCEL SW Pressed ON
      Released OFF
      RESUME/ACCELERATE switch RESUME/ACC SW Pressed ON
      Released OFF
      SET/COAST switch SET SW Pressed ON
      Released OFF
      Fig 2: Displaying "DATA MONITOR" Mode
      G03601957Courtesy of NISSAN MOTOR CO., U.S.A.

    Without CONSULT-II 

    1. Turn ignition switch ON.
    2. Check voltage between ECM terminal 99 and ground with pressing each button.
      VOLTAGE SPECIFICATION

      Switch Condition Voltage [V]
      MAIN switch Pressed Approx. 0
      Released Approx. 4
      CANCEL switch Pressed Approx. 1
      Released Approx. 4
      RESUME/ACCELERATE switch Pressed Approx. 3
      Released Approx. 4
      SET/COAST switch Pressed Approx. 2
      Released Approx. 4
      Fig 3: Checking Voltage Between ECM Terminal 99 And Ground
      G03601958Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    1. OK: GO TO  8.
    2. NG: GO TO 3.
  3. CHECK ASCD STEERING SWITCH GROUND CIRCUIT FOR OPEN AND SHORT 
    1. Turn ignition switch OFF.
    2. Disconnect combination switch harness connector M102.
    3. Disconnect ECM harness connector.
    4. Check harness continuity between combination switch terminal 15 and ECM terminal 67.

      Refer to WIRING DIAGRAM .

      Continuity should exist  .

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

    OK or NG 

    1. OK: GO TO  5.
    2. NG: GO TO 4.
      Fig 4: Identifying ASCD Steering Switch
      G03601959Courtesy of NISSAN MOTOR CO., U.S.A.
  4. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors M31, E152
    • Harness connectors E19, F33
    • Combination switch (spiral cable)
    • Harness for open and short between ECM and combination switch
    1. : Repair open circuit or short to ground or short to power in harness or connectors.
  5. CHECK ASCD STEERING SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT 
    1. Check harness continuity between ECM terminal 99 and combination switch terminal 14.

      Refer to WIRING DIAGRAM .

      Continuity should exist  .

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

    OK or NG 

    1. OK: GO TO  7.
    2. NG: GO TO 6.
  6. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors M31, E152
    • Combination switch (spiral cable)
    • Harness for open and short between ECM and combination switch
    1. : Repair open circuit or short to ground or short to power in harness or connectors.
  7. CHECK ASCD STEERING SWITCH 

    Refer to "COMPONENT INSPECTION ".

    OK or NG 

    1. OK: GO TO 8.
    2. NG: Replace ASCD steering switch. Refer to "REMOVAL AND INSTALLATION OF STEERING WHEEL AUDIO CONTROL SWITCHES ".
  8. CHECK INTERMITTENT INCIDENT 

    Refer to "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".

    1. : INSPECTION END 
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