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Contents

Wiring diagrams Section: 2004 - Automatic Air Conditioner - Sedan

Precautions for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT PRE-TENSIONER"

Precautions for Working with HFC-134a (R-134a)

CONTAMINATED REFRIGERANT

General Refrigerant Precautions

Lubricant Precautions

Precautions for Refrigerant Connection

Precautions for Servicing Compressor

RECOVERY/RECYCLING EQUIPMENT

ELECTRONIC LEAK DETECTOR

VACUUM PUMP

MANIFOLD GAUGE SET

SERVICE HOSES

SERVICE COUPLERS

REFRIGERANT WEIGHT SCALE

CHARGING CYLINDER

Precautions for Leak Detection Dye

Special Service Tools

HFC-134a (R-134a) Service Tools and Equipment

REFRIGERANT FLOW

FREEZE PROTECTION

REFRIGERANT PRESSURE SENSOR

PRESSURE RELIEF VALVE

General

LUBRICANT

System Construction

TRANSMISSION DATA AND TRANSMISSION ORDER

AIR MIX DOOR CONTROL (AUTOMATIC TEMPERATURE CONTROL)

FAN SPEED CONTROL

INTAKE DOOR CONTROL

OUTLET DOOR CONTROL

DISPLAY SCREEN

AUTO.ECON SWITCH

TEMPERATURE SWITCH (POTENTIO TEMPERATURE CONTROL)

RECIRCULATION (REC) SWITCH

FRESH (FRE) SWITCH

DEFROSTER (DEF) SWITCH

REAR WINDOW DEFOGGER SWITCH

OFF SWITCH

A/C SWITCH

MODE SWITCH

FAN SWITCHES

DUAL SWITCH (WITH LEFT AND RIGHT VENTILATION TEMPERATURE SEPARATELY CONTROL SYSTEM)

Fail-Safe Function

CONSULT-II

DATA MONITOR

Auto Amp. Terminals and Reference Value

2. STEP-1: LEDS AND DISPLAY ARE CHECKED

5. STEP-2: SENSOR CIRCUITS ARE CHECKED FOR OPEN OR SHORT CIRCUIT

6. STEP-3: MODE DOOR AND INTAKE DOOR POSITIONS ARE CHECKED

8. CHECK ACTUATORS

9. STEP-5: TEMPERATURE OF EACH SENSOR IS CHECKED

10. CHECK AMBIENT SENSOR

11. CHECK IN-VEHICLE SENSOR

12. CHECK INTAKE SENSOR

13. CHECK MULTIPLEX COMMUNICATION ERROR

14. CHECK MALFUNCTIONING SENSOR

15. CHECK MALFUNCTIONING DOOR MOTOR POSITION SWITCH

AUXILIARY MECHANISM: TEMPERATURE SETTING TRIMMER

AUXILIARY MECHANISM: FOOT POSITION SETTING TRIMMER

AUXILIARY MECHANISM: INLET PORT MEMORY FUNCTION

CHECKING MEMORY FUNCTION

CHECKING BLOWER

CHECKING RECIRCULATION

CHECKING TEMPERATURE DECREASE

CHECKING TEMPERATURE INCREASE

CHECK A/C SWITCH

CHECKING AUTO. ECON MODE

Power Supply and Ground Circuit for Auto Amp.

Display and A/C Auto Amp. (Automatic Amplifier)

Potentio Temperature Control (PTC)

2. CHECK GROUND CIRCUIT FOR DISPLAY AND A/C AUTO AMP.

LAN System Circuit

1. CHECK POWER SUPPLY FOR DISPLAY AND A/C AUTO AMP. SIDE

2. CHECK SIGNAL FOR DISPLAY AND A/C AUTO AMP. SIDE

3. CHECK POWER SUPPLY FOR MOTOR SIDE

4. CHECK SIGNAL FOR MOTOR SIDE

5. CHECK MOTOR GROUND CIRCUIT

Mode Door Motor Circuit

Component Parts

Mode Door Motor

Air Mix Door Motor Circuit

Air Mix Door Motor

Air Mix Door Motor PBR Circuit

Intake Door Motor Circuit

Blower Motor Circuit

Blower Speed Compensation

1. CHECK POWER SUPPLY FOR BLOWER MOTOR

2. CHECK GROUND CIRCUIT FOR BLOWER MOTOR

3. CHECK CIRCUIT CONTINUITY BLOWER MOTOR AND DISPLAY AND A/C AUTO AMP.

5. CHECK BLOWER MOTOR DRIVE SIGNAL

Magnet Clutch Circuit

Low Temperature Protection Control

1. CHECK AMBIENT SENSOR CIRCUIT AND INTAKE SENSOR CIRCUIT

3. CHECK CIRCUIT CONTINUITY BETWEEN IPDM E/R AND COMPRESSOR

4. CHECK MAGNET CLUTCH CIRCUIT

5. CHECK BCM INPUT (COMPRESSOR ON) SIGNAL

6. CHECK CIRCUIT CONTINUITY BETWEEN BCM AND DISPLAY AND A/C AUTO AMP.

7. CHECK VOLTAGE FOR DISPLAY AND A/C AUTO AMP. (COMPRESSOR ON SIGNAL)

8. CHECK REFRIGERANT PRESSURE SENSOR

9. CHECK BCM INPUT (FAN ON) SIGNAL

10. CHECK CIRCUIT CONTINUITY BETWEEN BCM AND DISPLAY AND A/C AUTO AMP.

11. CHECK VOLTAGE FOR DISPLAY AND A/C AUTO AMP. (FAN ON SIGNAL)

12. CHECK DISPLAY AND A/C AUTO AMP. INPUT (COMPRESSOR FEED BACK) SIGNAL

13. CHECK CIRCUIT CONTINUITY BETWEEN COMBINATION METER AND DISPLAY AND A/C AUTO AMP.

14. CHECK CAN COMMUNICATION

Insufficient Cooling

1. CHECK POWER SUPPLY FOR ECV (ELECTRONIC CONTROL VALVE)

2. CHECK ECV CONTROL SIGNAL

3. CHECK CIRCUIT CONTINUITY BETWEEN ECV AND DISPLAY AND A/C AUTO AMP.

4. CHECK ECV

Insufficient Heating

Memory Function

Ambient Sensor

AMBIENT TEMPERATURE INPUT PROCESS

1. CHECK VOLTAGE BETWEEN AMBIENT SENSOR AND GROUND

2. CHECK CIRCUIT CONTINUITY BETWEEN AMBIENT SENSOR AND DISPLAY AND A/C AUTO AMP.

3. CHECK AMBIENT SENSOR

4. CHECK CIRCUIT CONTINUITY BETWEEN AMBIENT SENSOR AND DISPLAY AND A/C AUTO AMP.

In-vehicle Sensor

Aspirator

1. CHECK VOLTAGE BETWEEN IN-VEHICLE SENSOR AND GROUND

2. CHECK CIRCUIT CONTINUITY BETWEEN IN-VEHICLE SENSOR AND DISPLAY AND A/C AUTO AMP.

3. CHECK IN-VEHICLE SENSOR

4. CHECK CIRCUIT CONTINUITY BETWEEN IN-VEHICLE SENSOR AND DISPLAY AND A/C AUTO AMP.

Sunload Sensor

SUNLOAD INPUT PROCESS

1. CHECK VOLTAGE BETWEEN SUNLOAD SENSOR AND GROUND

2. CHECK CIRCUIT CONTINUITY BETWEEN SUNLOAD SENSOR AND DISPLAY AND A/C AUTO AMP.

3. CHECK SUNLOAD SENSOR

4. CHECK CIRCUIT CONTINUITY BETWEEN SUNLOAD SENSOR AND DISPLAY AND A/C AUTO AMP.

Intake Sensor

1. CHECK VOLTAGE BETWEEN INTAKE SENSOR AND GROUND

2. CHECK CIRCUIT CONTINUITY BETWEEN INTAKE SENSOR AND DISPLAY AND A/C AUTO AMP.

3. CHECK INTAKE SENSOR

4. CHECK CIRCUIT CONTINUITY BETWEEN INTAKE SENSOR AND DISPLAY AND A/C AUTO AMP.

1. CHECK FOR DISPLAY AND A/C AUTO AMP. OUTPUT

2. CHECK CIRCUIT CONTINUITY BETWEEN A/C AND AUDIO CONTROLLER AND DISPLAY AND A/C AUTO AMP.

3. CHECK FOR DISPLAY AND A/C AUTO AMP. INPUT

4. CHECK CIRCUIT CONTINUITY BETWEEN A/C AND AUDIO CONTROLLER AND DISPLAY AND A/C AUTO AMP.

FUNCTION

Passenger Side

Driver Side (If Equipped)

Discharging Refrigerant

Components

Coil

Checking for Refrigerant Leaks

Checking System for Leaks Using the Fluorescent Leak Detector

Dye Injection

PRECAUTIONS FOR HANDLING LEAK DETECTOR

CHECKING PROCEDURE

Engine Idling Speed

Belt Tension

All sections

MODE SWITCH Infiniti G35 III

2004 - Automatic Air Conditioner - Sedan

MODE SWITCH

Controls the air discharge outlets.

When air outlet switches to D/F position, compressor will turn ON and fixed to REC mode.