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Home >> Infiniti >> 2011 >> QX56 AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - DTCS P1225 Through P2A03 >> DTC P1564: ICC Steering Switch >> Diagnosis Procedure

Diagnosis Procedure

  1. CHECK ICC STEERING SWITCH CIRCUIT
    1. Turn ignition switch ON.
    2. Check the voltage between ECM harness connector terminals under the following conditions.
      VOLTAGE SPECIFICATION

      ECM Condition Voltage (V)
      Connector + -
      Terminal Terminal
      E80 128 (ICC steering switch signal) 130 MAIN switch: Pressed Approx. 0
      DYNAMIC DRIVER ASSISTANCE switch: Pressed Approx. 1.0
      CANCEL switch: Pressed Approx. 1.9
      DISTANCE switch: Pressed Approx. 2.6
      SET/COAST switch: Pressed Approx. 3.2
      RESUME/ACCELERATE switch: Pressed Approx. 3.7
      All ICC steering switches: Released Approx. 4.2

      Is the inspection result normal? 

      YES: GO TO  7.

      NO: GO TO 2.

  2. CHECK ICC STEERING SWITCH GROUND CIRCUIT FOR OPEN AND SHORT
    1. Turn ignition switch OFF.
    2. Disconnect ECM harness connector.
    3. Disconnect combination switch harness connector.
    4. Check the continuity between combination switch and ECM harness connector.
      CONTINUITY SPECIFICATION

      Combination switch ECM Continuity
      Connector Terminal Connector Terminal
      - 32 E80 130 Existed
    5. Also check harness for short to ground and short to power.

      Is the inspection result normal? 

      YES: GO TO  4.

      NO: GO TO 3.

  3. DETECT MALFUNCTIONING PART

    Check the following.

    • Combination switch (spiral cable)
    • Harness for open and short between ECM and combination switch

      Repair open circuit, short to ground or short to power in harness or connectors.

  4. CHECK ICC STEERING SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
    1. Check the continuity between combination switch and ECM harness connector.
      CONTINUITY SPECIFICATION

      Combination switch ECM Continuity
      Connector Terminal Connector Terminal
      - 25 E80 130 Existed
    2. Also check harness for short to ground and short to power.

      Is the inspection result normal? 

      YES: GO TO  6.

      NO: GO TO 5.

  5. DETECT MALFUNCTIONING PART

    Check the following.

    • Combination switch (spiral cable)
    • Harness for open and short between ECM and combination switch

      Repair open circuit, short to ground or short to power in harness or connectors.

  6. CHECK ICC STEERING SWITCH

    Refer to "COMPONENT INSPECTION (ICC STEERING SWITCH) ".

    Is the inspection result normal? 

    YES: GO TO 7.

    NO: Replace ICC steering switch. Refer to "REMOVAL AND INSTALLATION ".

  7. CHECK INTERMITTENT INCIDENT

    Refer to "INTERMITTENT INCIDENT ".

    INSPECTION END

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