LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Infiniti >> 2009 >> QX56 AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Component Testing >> Electrical Load Signal >> Diagnosis Procedure
October 30: LEMON manuals on a temporary server, it is slow and having issues, download the manuals you need! Later in November we will switch back to the fast server.

Diagnosis Procedure

  1. CHECK LOAD SIGNAL CIRCUIT OVERALL FUNCTION-I
    1. Turn ignition switch ON.
    2. Connect CONSULT-III and select "DATA MONITOR" mode.
    3. Select "LOAD SIGNAL" and check indication under the following conditions.
      LOAD SIGNAL INDICATION CONDITION

      Condition Indication
      Rear window defogger switch: ON ON
      Rear window defogger switch: OFF OFF

      OK or NG 

      OK: GO TO 2.

      NG: GO TO  4.

  2. CHECK LOAD SIGNAL CIRCUIT OVERALL FUNCTION-II

    Check "LOAD SIGNAL" indication under the following conditions.

    LOAD SIGNAL INDICATION CONDITION

    Condition Indication
    Heater fan control switch: ON ON
    Heater fan control switch: OFF OFF

    OK or NG 

    OK: GO TO 3.

    NG: GO TO  5.

  3. CHECK HEATER FAN SIGNAL CIRCUIT OVERALL FUNCTION

    Select "HEATER FAN SW" and check indication under the following conditions.

    HEATER FAN SIGNAL INDICATION CONDITION

    Condition Indication
    Lighting switch: ON at 2nd position ON
    Lighting switch: OFF OFF

    OK or NG 

    OK: INSPECTION END 

    NG: GO TO  6.

  4. CHECK REAR WINDOW DEFOGGER SYSTEM

    Refer to REAR WINDOW DEFOGGER SYSTEM .

    INSPECTION END 

  5. CHECK HEADLAMP SYSTEM

    Refer to HEADLAMP , or DAYTIME LIGHT SYSTEM .

    INSPECTION END 

  6. CHECK HEATER FAN CONTROL SYSTEM

    Refer to BLOWER MOTOR CONTROL SYSTEM .

    INSPECTION END