Nissan Maxima Service and Repair Manual: Heater & air conditioning control system
- Basic inspection
- System description
- Automatic air conditioner system
- DTC/circuit diagnosis
- ECU diagnosis information
- Wiring diagram
- Symptom diagnosis
- Precaution
- Preparation
- Removal and installation
- Basic inspection
- System description
- DTC/circuit diagnosis
- ECU diagnosis information
- Wiring diagram
- Symptom diagnosis
- Precaution
- Preparation
- Removal and installation
INSPECTION AND ADJUSTMENT Operational Check DESCRIPTION The purpose of the operational check is to check that the individual system operates normally. Conditions: Engine running at normal operating temperature INSPECTION PROCEDURE 1.CHECK MEMORY FUNCTION Start the engine. Operate the temperature control dial (driver side) and raise the temperature setting to 32C (90F). Press the OFF switch. Turn the ignition switch OFF. Turn the ignition switch ON. Press the AUTO switch. Check that the temperature setting, before turning the ignition switch OFF, is stored. 2.CHECK BLOWER MOTOR SPEED Operate the fan control dial. Check that the fan speed changes. Check the operation for all fan speeds. 3.
COMPRESSOR CONTROL FUNCTION Description PRINCIPLE OF OPERATION Compressor is not activated. Functional circuit diagram CAN (1): A/C switch signal : Blower fan motor switch signal CAN (2): A/C compressor request signal Functional initial inspection chart Fail-Safe FAIL-SAFE FUNCTION If a communication error exists between the A/C auto amp.
System Diagram CONTROL SYSTEM The control system consists of input sensors, switches, the A/C auto amp. (microcomputer) and outputs. The relationship of these components is as shown in the figure below: System Description CONTROL OPERATION Display The operation status of the HVAC system is displayed on the screen. A/C and AV Switch Assembly Temperature control dial (driver side)/AUTO switch Defroster switch ON - OFF switch/fan control dial Rear window defogger switch Temperature control dial (passenger)/ DUAL mode switch Mode switch Fresh air switch Recirculation switch A/C ON/OFF switch MODE SWITCH The air discharge outlets are controlled with this switch.
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. Fail-Safe FAIL-SAFE FUNCTION If a communication error exists between the A/C auto amp., the AV control unit and A/C and AV switch assembly for 30 seconds or longer, air conditioner is controlled under the following conditions: Compressor: ON Air outlet: AUTO Air inlet: FRE (Fresh) Blower fan speed: AUTO Set temperature: Setting before communication error occurs Display: OFF DTC Inspection Priority Chart If some DTCs are displayed at the same time, perform inspections one by one based on the following priority chart.
AIR CONDITIONER CONTROL Wiring Diagram - With Color Display
Precaution for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT PRE-TENSIONER" The Supplemental Restraint System such as "AIR BAG" and "SEAT BELT PRE-TENSIONER", used along with a front seat belt, helps to reduce the risk or severity of injury to the driver and front passenger for certain types of collision. This system includes seat belt switch inputs and dual stage front air bag modules. The SRS system uses the seat belt switches to determine the front air bag deployment, and may only deploy one front air bag, depending on the severity of a collision and whether the front occupants are belted or unbelted.
Special Service Tool The actual shapes of the tools may differ from those illustrated here.
INSPECTION AND ADJUSTMENT Operational Check DESCRIPTION The purpose of the operational check is to check that the individual system operates normally Conditions: Engine running at normal operating temperature INSPECTION PROCEDURE 1.CHECK MEMORY FUNCTION Start the engine. Operate the temperature control switch (driver side) and raise the temperature setting to 32C (90F). Press the OFF switch. Turn the ignition switch OFF. Turn the ignition switch ON. Press the AUTO switch. Check that the temperature setting, before turning the ignition switch OFF, is stored. 2.CHECK BLOWER MOTOR SPEED Operate the fan control dial. Check that the fan speed changes. Check the operation for all fan speeds. 3.
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. DTC Inspection Priority Chart If some DTCs are displayed at the same time, perform inspections one by one based on the following priority chart. DTC Index *: Perform self-diagnosis under direct sunlight. When performing indoors, aim a light (more than 60 W) at sunload sensor, otherwise selfdiagnosisreports an error even though the sunload sensor is functioning normally.
AIR CONDITIONER CONTROL Wiring Diagram - With Monochrome Display
Precaution for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT PRE-TENSIONER" The Supplemental Restraint System such as "AIR BAG" and "SEAT BELT PRE-TENSIONER", used along with a front seat belt, helps to reduce the risk or severity of injury to the driver and front passenger for certain types of collision. This system includes seat belt switch inputs and dual stage front air bag modules. The SRS system uses the seat belt switches to determine the front air bag deployment, and may only deploy one front air bag, depending on the severity of a collision and whether the front occupants are belted or unbelted.
Special Service Tool The actual shapes of the tools may differ from those illustrated here.
