Nissan Maxima Service and Repair Manual: Power supply and ground circuit

Nissan Maxima Service and Repair Manual / Ventilation, heater & air conditioner / Heater & air conditioning control system / DTC/circuit diagnosis / Power supply and ground circuit

A/C AUTO AMP.

A/C AUTO AMP.: Description

COMPONENT DESCRIPTION

A/C Auto Amp. (Air Conditioner Automatic Amplifier)

Nissan Maxima. COMPONENT DESCRIPTION

The A/C auto amp. (1) has a built-in microcomputer that processes information sent from various sensors needed for air conditioner operation. The air mix door motor(s), the mode door motor, the intake door motor, the blower motor and the A/C compressor are then controlled.

When the various switches and temperature control switches are operated, data is input to the A/C auto amp. from the AV switch assembly using CAN communication.

The A/C auto amp. is operated with control mechanisms. Signals from various switches and Potentio Temperature Control (PTC) are directly entered into the A/C auto amp.

Power Supply and Ground Circuit for A/C Auto Amp.

Nissan Maxima. COMPONENT DESCRIPTION

A/C AUTO AMP.: Component Function Check

1.CHECK OPERATION

  1. Press the AUTO switch, and then check that "AUTO" is shown on the display.
  2. Operate the temperature control switch (driver side). Check that the fan speed or outlet changes. (The discharge air temperature or fan speed varies depending on the ambient temperature, in-vehicle temperature, and temperature setting.)

A/C AUTO AMP.: Diagnosis Procedure

1.CHECK A/C AUTO AMP. POWER SUPPLY

Nissan Maxima. CHECK A/C AUTO AMP. POWER SUPPLY

  1. Turn ignition switch OFF.
  2. Disconnect the A/C auto amp. connector.
  3. Turn ignition switch ON.
  4. Check voltage between A/C auto amp. harness connector M37 terminals 17, 20, 40 and ground.

Nissan Maxima. CHECK A/C AUTO AMP. POWER SUPPLY

2.CHECK FUSE

Check 10A fuses [Nos. 3, 6 and 17, located in the fuse block (J/B)].

3.CHECK A/C AUTO AMP. GROUND CIRCUIT

  1. Turn ignition switch OFF.
  2. Check continuity between A/C auto amp. harness connector M37 terminals 19, 39 and ground.

Nissan Maxima. CHECK A/C AUTO AMP. GROUND CIRCUIT

19, 39 - Ground: Continuity should exist

A/C SWITCH ASSEMBLY

A/C SWITCH ASSEMBLY: Component Function Check

1.CHECK OPERATION

  1. Press the AUTO switch, and then check that "AUTO" is shown on the display.
  2. Operate the temperature control switch (driver side). Check that the fan speed or outlet changes. (The discharge air temperature or fan speed varies depending on the ambient temperature, in-vehicle temperature, and temperature setting.)

A/C SWITCH ASSEMBLY: Diagnosis Procedure

1.CHECK A/C SWITCH ASSEMBLY POWER SUPPLY

Nissan Maxima. CHECK A/C SWITCH ASSEMBLY POWER SUPPLY

  1. Disconnect the A/C switch assembly connector.
  2. Turn ignition switch ON.
  3. Check voltage between A/C switch assembly harness connector M104 terminal 1 and ground.

Nissan Maxima. CHECK A/C SWITCH ASSEMBLY POWER SUPPLY

2.CHECK FUSE

Check 10A fuse [No.3, located in the fuse block (J/B)].

3.CHECK A/C SWITCH ASSEMBLY GROUND CIRCUIT

  1. Turn ignition switch OFF.
  2. Check continuity between A/C switch assembly harness connector M104 terminal 2 and ground.

Nissan Maxima. .CHECK A/C SWITCH ASSEMBLY GROUND CIRCUIT

2 - Ground: Continuity should exist.

A/C DISPLAY UNIT

A/C DISPLAY UNIT: Diagnosis Procedure

1.CHECK A/C DISPLAY UNIT POWER SUPPLY CIRCUIT

  1. Disconnect the A/C display unit connector.
  2. Turn ignition switch ON.
  3. Check voltage between A/C display unit harness connector M101 terminal 6 and ground.

Nissan Maxima. CHECK A/C DISPLAY UNIT POWER SUPPLY CIRCUIT

6 - Ground: Battery voltage

2.CHECK GROUND CIRCUIT FOR A/C DISPLAY UNIT

  1. Turn ignition switch OFF.
  2. Check continuity between A/C display unit harness connector M101 terminal 1 and ground.

Nissan Maxima. CHECK GROUND CIRCUIT FOR A/C DISPLAY UNIT

1 - Ground: Continuity should exist

    A/C switch assembly signal circuit
    Diagnosis Procedure 1.CHECK WITH SELF-DIAGNOSIS FUNCTION OF CONSULT Using CONSULT, perform "SELF-DIAGNOSIS RESULTS" of HVAC. Check if any DTC No. is displayed in the self-diagnosis results. ...

    ECU diagnosis information
    A/C AUTO AMP. Reference Value VALUES ON THE DIAGNOSIS TOOL CONSULT MONITOR ITEM A/C AUTO AMP. HARNESS CONNECTOR TERMINAL LAYOUT TERMINALS AND REFERENCE VALUES FOR A/C AUTO AMP. D ...

    Other materials:

    Encoder
    DRIVER SIDE DRIVER SIDE : Description Detects condition of the front power window motor LH operation and transmits to main power window and door lock/unlock switch as pulse signal. DRIVER SIDE : Component Function Check 1. CHECK ENCODER OPERATION Check that front door glass LH performs AUTO ...

    Instrument lower panel LH
    Removal and Installation REMOVAL Using a suitable tool, gently remove the instrument side finisher (LH) (1). Remove the instrument lower panel (LH) (1). Open the fuse block cover and remove the instrument lower panel screw (A). Disconnect the harness connectors and aspirator ...

    Windshield-washer fluid
    Windshield-washer fluid reservoir Fill the windshield-washer fluid reservoir periodically. Add windshield-washer fluid when the low windshield-washer fluid warning light comes on. To fill the windshield-washer fluid reservoir, lift the cap off the reservoir and pour the windshieldwasher ...

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