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Home >> Toyota >> 2004 >> Highlander Limited, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 891 (Engine Control System (Diagnostic Codes & Symptom Tests)) >> DTC/Circuit Diagnosis >> DTC P1564: ASCD Steering Switch >> Diagnosis Procedure

Diagnosis Procedure

WARNING: This page is about a different car, the 2013 Nissan Armada. 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: Identifying Body Ground Screws
      G08690744Courtesy of NISSAN NORTH AMERICA, INC.

      OK or NG 

      OK: GO TO 2.

      NG: Repair or replace ground connections.

  2. CHECK ASCD STEERING SWITCH CIRCUIT 

    With CONSULT 

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

    Without CONSULT 

    1. Turn ignition switch ON.
    2. Check voltage between ECM terminal 99 and ground with pressing each button.
      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 2: Checking Voltage Between ECM Terminal 99 And Ground
      G08690745Courtesy of NISSAN NORTH AMERICA, INC.

      OK or NG 

      OK: GO TO  8.

      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 M30.
    3. Disconnect ECM harness connector.
    4. Check harness continuity between combination switch terminal 26 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 

      OK: GO TO  5.

      NG: GO TO 4.

      Fig 3: Identifying ASCD Steering Switch
      G08690746Courtesy of NISSAN NORTH AMERICA, INC.
  4. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors M31, E152
    • Harness connectors E5, F14
    • Combination switch (spiral cable)
    • Harness for open and short between ECM and combination switch

      : 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 27.

      Refer to WIRING DIAGRAM .

      Continuity should exist  .

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

      OK or NG 

      OK: GO TO  7.

      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

      : 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 

    OK: GO TO 8.

    NG: Replace ASCD steering switch. Refer to "REMOVAL AND INSTALLATION ".

  8. CHECK INTERMITTENT INCIDENT 

    Refer to "HOW TO CHECK TERMINAL " and "INTERMITTENT INCIDENT ".

    :INSPECTION END 

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