Nissan Maxima Service and Repair Manual: Check cooling fan relay

Description

The electrical load signal (Headlamp switch signal, rear window defogger switch signal, etc.) is transferred via the CAN communication line from BCM to ECM via the IPDM E/R.

Component Function Check

1.CHECK REAR WINDOW DEFOGGER SWITCH FUNCTION

  1. Turn ignition switch ON.
  2. Connect CONSULT and select "DATA MONITOR" mode.
  3. Select "LOAD SIGNAL" and check indication under the following conditions.

Nissan Maxima. CHECK REAR WINDOW DEFOGGER SWITCH FUNCTION

2.CHECK LIGHTING SWITCH FUNCTION

Check "LOAD SIGNAL" indication under the following conditions.

Nissan Maxima. CHECK LIGHTING SWITCH FUNCTION

3.CHECK HEATER FAN CONTROL SWITCH FUNCTION

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

Nissan Maxima. CHECK HEATER FAN CONTROL SWITCH FUNCTION

Diagnosis Procedure

1.INSPECTION START

Confirm the malfunctioning circuit (rear window defogger, headlamp or heater fan).

2.CHECK REAR WINDOW DEFOGGER SYSTEM

3.CHECK HEADLAMP SYSTEM

4.CHECK HEATER FAN CONTROL SYSTEM

    Cooling fan
    Description The ECM controls the cooling fan corresponding to the vehicle speed, engine coolant temperature, refrigerant pressure, and air conditioner ON signal. The control system has 4-step con ...

    Electronic controlled engine mount
    Description In the idle range, ECM turns OFF the electronically-controlled engine mount control solenoid valve and applies manifold pressure to the electronically controlled engine mount. This de ...

    Other materials:

    B terminal C 
    Description  The "B" terminal is constantly supplied with battery power. Diagnosis Procedure  CAUTION: Perform diagnosis under the condition that the engine cannot start by the following procedure.  Remove fuel pump fuse.  Crank or start the engine (where possible) unt ...

    Front power seat adjustment
    Operating tips The power seat motor has an auto-reset overload protection circuit. If the motor stops during operation, wait 30 seconds then reactivate the switch. Do not operate the power seat switch for a long period of time when the engine is off. This will discharge the bat ...

    Warning lights
    For additional information on warnings and indicators, refer to "Vehicle information display" in this section. Anti-lock Braking System (ABS) warning light When the ignition switch is placed in the ON position, the ABS warning light illuminates and then turns off. This indicates the ABS is o ...

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    Nissan Maxima Service and Repair Manual

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