Nissan Maxima Service and Repair Manual: Check cooling fan relay

Nissan Maxima Service and Repair Manual / Engine / Engine control system / DTC/circuit diagnosis / 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:

    Multifunction switch 
    Removal and Installation  REMOVAL Remove cluster lid D. Refer to IP-10, "Exploded View". Remove the four multifunction switch screws (A) and remove the multifunction switch (2) from cluster lid D (1). : Metal clip  INSTALLATION Installation is in the reverse order of r ...

    Intake Manifold
    Removal and Installation Intake manifold Intake manifold gaskets  Refer to INSTALLATION REMOVAL WARNING: To avoid the danger of being scalded, do not drain the coolant when the engine is hot. Release the fuel pressure. Refer to EC-592, "Inspection". Disconnect the ba ...

    Front bumper
    Exploded View Tow cover Engine under cover Core support cover Fog lamp cover Fog lamp (if equipped) Front bumper fascia Center support bracket Upper fascia support Front bumper upper bracket Front bumper side bracket Front bumper fascia seal Front bumper stiffener ...

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