Suzuki Grand Vitara JB416 / JB420 / JB419. Manual - part 372

7-ii Table of Contents

Precautions on Servicing Compressor 

Assembly ..........................................................7B-4

General Description .............................................7B-5

AUTO A/C System Description ...........................7B-5
HVAC Control System Description......................7B-5
HVAC Control Module Operation Description .....7B-6
A/C Refrigerant Type Description .......................7B-6
Sub-Cool A/C System Description ......................7B-7
A/C Evaporator Temperature Sensor 

Description ........................................................7B-8

On-Board Diagnostic System Description...........7B-8

Schematic and Routing Diagram........................7B-9

Air Flow Diagram of A/C System.........................7B-9
Auto A/C Electronic Control Input / Output 

Diagram ............................................................7B-9

A/C System Wiring Circuit Diagram ..................7B-10

Component Location .........................................7B-12

A/C Control System Components Location.......7B-12

Diagnostic Information and Procedures..........7B-15

Air Conditioning System Check.........................7B-15
DTC Check........................................................7B-17
DTC Clearance .................................................7B-18
DTC Table.........................................................7B-19
Fail-Safe Table..................................................7B-21
Scan Tool Data .................................................7B-23
Visual Inspection ...............................................7B-24
A/C System Performance Inspection ................7B-25
A/C System Symptom Diagnosis ......................7B-32
Abnormal Noise Diagnosis................................7B-34
Abnormal Noise Symptom Diagnosis of A/C 

System ............................................................7B-34

DTC B1502: Inside Air Temperature Sensor 

and/or Its Circuit Malfunction ..........................7B-36

DTC B1503: A/C Evaporator Air Temperature 

Sensor and/or Its Circuit Malfunction ..............7B-37

DTC B1504: Sunload Sensor and/or Its 

Circuit Malfunction ..........................................7B-39

DTC B1511: Temperature Control Actuator 

(Position Sensor) and/or Its Circuit 
Malfunction......................................................7B-40

DTC B1512: Air Flow Control Actuator 

(Position Sensor) and/or Its Circuit 
Malfunction......................................................7B-43

DTC B1513: Temperature Control Actuator 

and/or Its Circuit Malfunction ..........................7B-45

DTC B1514: Air Flow Control Actuator and/or 

Its Circuit Malfunction......................................7B-48

DTC B1520: Temperature Selector and/or Its 

Circuit Malfunction ..........................................7B-50

DTC B1521: Blower Speed Selector and/or Its 

Circuit Malfunction ..........................................7B-51

DTC B1530: Air Intake Control Actuator 

(Position Sensor) and/or Its Circuit 
Malfunction......................................................7B-51

DTC B1531: Air Intake Control Actuator and/

or Its Circuit Malfunction .................................7B-54

DTC B1546: A/C Refrigerant Pressure 

Malfunction......................................................7B-56

DTC B1551: Serial Communication Circuit 

Malfunction......................................................7B-57

DTC B1552: Serial Communication Circuit 

Malfunction......................................................7B-59

DTC B1553: CAN Communication Circuit 

Malfunction......................................................7B-60

DTC B1556: Camshaft Position (CMP) 

Sensor and/or Its Circuit Malfunction ..............7B-60

DTC B1557: Wheel Speed Sensor and/or Its 

Circuit Malfunction...........................................7B-61

DTC B1561: Engine Coolant Temperature 

Sensor and/or Its Circuit Malfunction ..............7B-61

DTC B1562: Outside Air Temperature Sensor 

and/or Its Circuit Malfunction...........................7B-62

DTC B1563: A/C Refrigerant Pressure 

Sensor and/or Its Circuit Malfunction ..............7B-62

HVAC Control Module and Its Circuits 

Inspection........................................................7B-63

A/C System Inspection at ECM.........................7B-65

Repair Instructions ............................................7B-66

Operation Procedure for Charging A/C with 

Refrigerant ......................................................7B-66

A/C Condenser Assembly On-Vehicle 

Inspection........................................................7B-71

A/C Condenser Assembly Removal and 

Installation .......................................................7B-71

Desiccant Removal and Installation ..................7B-71
HVAC Air Filter Removal and Installation .........7B-72
HVAC Air Filter Inspection ................................7B-72
HVAC Unit Components ...................................7B-73
HVAC Unit Removal and Installation ................7B-74
A/C Evaporator Removal and Installation .........7B-75
A/C Evaporator Inspection ................................7B-75
A/C Evaporator Temperature Sensor 

Removal and Installation.................................7B-76

A/C Evaporator Temperature Sensor 

Inspection........................................................7B-77

Expansion Valve On-Vehicle Inspection ...........7B-77
Expansion Valve Removal and Installation .......7B-77
A/C Refrigerant Pressure Sensor and Its 

Circuit Inspection (Petrol Engine Model).........7B-78

A/C Refrigerant Pressure Sensor and Its 

Circuit Inspection (Diesel Engine Model) ........7B-78

A/C Refrigerant Pressure Sensor Removal 

and Installation ................................................7B-78

Sunload Sensor Removal and Installation ........7B-79
Sunload Sensor Inspection ...............................7B-79
Inside Air Temperature Sensor Removal and 

Installation .......................................................7B-80

Inside Air Temperature Sensor Inspection........7B-80
Outside Air Temperature Sensor Removal 

and Installation ................................................7B-80

Outside Air Temperature Sensor Inspection .....7B-80
Air Flow Control Actuator Removal and 

Installation .......................................................7B-80

Air Flow Control Actuator Inspection.................7B-80
Air Intake Control Actuator Removal and 

Installation .......................................................7B-80

Air Intake Control Actuator Inspection...............7B-81

Table of Contents 7-iii

Temperature Control Actuator Removal and 

Installation.......................................................7B-81

Temperature Control Actuator Inspection .........7B-81
HVAC Control Module Removal and 

Installation.......................................................7B-81

A/C Compressor Drive Belt Inspection and 

Adjustment ......................................................7B-81

A/C Compressor Drive Belt Removal and 

Installation.......................................................7B-81

A/C Compressor Relay Inspection.................... 7B-81
Compressor Assembly On-Vehicle Inspection ..7B-83
Compressor Assembly and Compressor 

Bracket Components (F9Q Engine Model) .....7B-83

Compressor Assembly Removal and 

Installation for M16 Engine Model...................7B-84

Compressor Assembly Removal and 

Installation for J20 Engine Model.................... 7B-84

Compressor Assembly Removal and 

Installation (F9Q Engine Model) ..................... 7B-85

Magnet Clutch Components for M16 Engine 

Model .............................................................. 7B-85

Magnet Clutch Components for J20 Engine 

Model .............................................................. 7B-86

Magnet Clutch Components (F9Q Engine 

Model) .............................................................7B-87

Magnet Clutch Operating Check for M16 

Engine Model .................................................. 7B-87

Magnet Clutch Operating Check for J20 

Engine Model ..................................................7B-87

Magnet Clutch Operating Check (F9Q Engine 

Model) .............................................................7B-88

Magnet Clutch Removal and Installation for 

M16 Engine Model ..........................................7B-88

Magnet Clutch Removal and Installation for 

J20 Engine Model ...........................................7B-90

Magnet Clutch Removal and Installation (F9Q 

Engine Model) .................................................7B-92

Thermal Switch On-Vehicle Inspection for 

M16 Engine Model ..........................................7B-94

Thermal Switch Removal and Installation for 

M16 Engine Model ..........................................7B-94

Relief Valve On-Vehicle Inspection for M16 

Engine Model ..................................................7B-95

Relief Valve On-Vehicle Inspection For J20 

Engine Model ..................................................7B-95

Relief Valve Removal and Installation for M16 

Engine Model ..................................................7B-95

Relief Valve On-Vehicle Inspection (F9Q 

Engine Model) .................................................7B-96

Specifications.....................................................7B-96

Tightening Torque Specifications......................7B-96

Special Tools and Equipment ...........................7B-97

Recommended Service Material .......................7B-97
Special Tool ......................................................7B-97

7-1 Precautions: 

HVAC

Precautions

Precautions

Precautions for HVAC

S6JB0A7000001

Air Bag Warning
Refer to “Air Bag Warning in Section 00”.

A/C System Caution
Refer to “A/C System Caution in Section 00”.

Precautions on Servicing A/C System
Refer to “Precautions on Servicing A/C System in Section 7B”.

Precautions on Servicing Compressor
Refer to “Precautions on Servicing Compressor Assembly in Section 7B”.

Heater and Ventilation:  7A-1

HVAC

Heater and Ventilation

General Description

Heater and Ventilation Construction

S6JB0A7101001

The heater, an in and out air selectable-type hot water heater, is so constructed that it is possible to assure an 
agreeable ventilation at all times by providing the ventilator air outlets at the center and both sides (right and left) of the 
instrument panel, the hot air outlet at a place close to the feet of front passengers, and the defroster air outlets at 
places, right and left, along the windshield glass.
The heater and ventilation consist of the following parts.

7

7

2

2

5

5

6

6

6

6

9

9

8

8

12

3

4

10

11

11

7

7

1

I5JB0A710001-04

1. HVAC unit

4. Defroster duct

7. Foot air

10. Fresh air 

2. Rear duct

5. Side ventilation louver

8. Defroster air

11. Recirculation air 

3. Ventilator duct

6. Ventilation air

9. Demister air

12. Center ventilation louver