Suzuki Grand Vitara JB416 / JB420. Service manual — part 273

7-ii Table of Contents

Auto A/C Electronic Control Input / Output

Diagram . . . . . . . . . . . . . . . 7B-8

A/C System Wiring Circuit Diagram . . . . . 7B-9

Component Location . . . . . . . . . . .7B-10

A/C Control System Components Location. ...7B-10

Diagnostic Information and Procedures. . ..7B-12

Air Conditioning System Check. . . . . . .7B-12
DTC Check. . . . . . . . . . . . . . 7B-14
DTC Clearance . . . . . . . . . . . . .7B-15
DTC Table. . . . . . . . . . . . . . .7B-16
Fail-Safe Table. . . . . . . . . . . . ..7B-18
Scan Tool Data . . . . . . . . . . . . .7B-19
Visual Inspection . . . . . . . . . . . ...7B-21
A/C System Performance Inspection . . . . 7B-21
A/C System Symptom Diagnosis . . . . . ..7B-27
Abnormal Noise Diagnosis. . . . . . . . 7B-29
Abnormal Noise Symptom Diagnosis of A/C

System . . . . . . . . . . . . . . . 7B-29

DTC B1502: Inside Air Temperature Sensor

and/or Its Circuit Malfunction . . . . . . ..7B-31

DTC B1503: A/C Evaporator Air Temperature

Sensor and/or Its Circuit Malfunction . . . ..7B-32

DTC B1504: Sunload Sensor and/or Its

Circuit Malfunction . . . . . . . . . . ..7B-34

DTC B1511: Temperature Control Actuator

(Position Sensor) and/or Its Circuit
Malfunction. . . . . . . . . . . . . ..7B-35

DTC B1512: Air Flow Control Actuator

(Position Sensor) and/or Its Circuit
Malfunction. . . . . . . . . . . . . ..7B-38

DTC B1513: Temperature Control Actuator

and/or Its Circuit Malfunction . . . . . . ..7B-40

DTC B1514: Air Flow Control Actuator and/or

Its Circuit Malfunction. . . . . . . . . ..7B-43

DTC B1520: Temperature Selector and/or Its

Circuit Malfunction . . . . . . . . . . ..7B-45

DTC B1521: Blower Speed Selector and/or Its

Circuit Malfunction . . . . . . . . . . ..7B-46

DTC B1530: Air Intake Control Actuator

(Position Sensor) and/or Its Circuit
Malfunction. . . . . . . . . . . . . ..7B-46

DTC B1531: Air Intake Control Actuator and/

or Its Circuit Malfunction . . . . . . . . .7B-49

DTC B1546: A/C Refrigerant Pressure

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

DTC B1551: Serial Communication Circuit

Malfunction. . . . . . . . . . . . . ..7B-52

DTC B1552: Serial Communication Circuit

Malfunction. . . . . . . . . . . . . ..7B-54

DTC B1553: CAN Communication Circuit

Malfunction. . . . . . . . . . . . . ..7B-54

DTC B1556: Camshaft Position (CMP)

Sensor and/or Its Circuit Malfunction . . . ..7B-55

DTC B1557: Wheel Speed Sensor and/or Its

Circuit Malfunction . . . . . . . . . . ..7B-55

DTC B1561: Engine Coolant Temperature

Sensor and/or Its Circuit Malfunction . . . ..7B-55

DTC B1562: Outside Air Temperature Sensor

and/or Its Circuit Malfunction . . . . . . ..7B-56

DTC B1563: A/C Refrigerant Pressure

Sensor and/or Its Circuit Malfunction . . . ..7B-56

HVAC Control Module and Its Circuits

Inspection. . . . . . . . . . . . . . 7B-56

A/C System Inspection at ECM. . . . . . .7B-59

Repair Instructions . . . . . . . . . . . 7B-60

Operation Procedure for Charging A/C with

Refrigerant . . . . . . . . . . . . . ..7B-60

A/C Condenser Assembly On-Vehicle

Inspection. . . . . . . . . . . . . . 7B-64

A/C Condenser Assembly Removal and

Installation . . . . . . . . . . . . . ...7B-64

Desiccant Removal and Installation . . . . ..7B-65
HVAC Air Filter Removal and Installation . . .7B-66
HVAC Air Filter Inspection . . . . . . . . 7B-66
HVAC Unit Components . . . . . . . . ...7B-67
HVAC Unit Removal and Installation . . . . 7B-68
A/C Evaporator Removal and Installation . . .7B-69
A/C Evaporator Inspection . . . . . . . . 7B-69
A/C Evaporator Temperature Sensor

Removal and Installation. . . . . . . . .7B-69

A/C Evaporator Temperature Sensor

Inspection. . . . . . . . . . . . . . 7B-70

Expansion Valve On-Vehicle Inspection . . ...7B-70
Expansion Valve Removal and Installation . ...7B-71
A/C Refrigerant Pressure Sensor and Its

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

A/C Refrigerant Pressure Sensor Removal

and Installation . . . . . . . . . . . . 7B-72

Sunload Sensor Removal and Installation . . 7B-72
Sunload Sensor Inspection . . . . . . . ...7B-73
Inside Air Temperature Sensor Removal and

Installation . . . . . . . . . . . . . ...7B-73

Inside Air Temperature Sensor Inspection. . 7B-73
Outside Air Temperature Sensor Removal

and Installation . . . . . . . . . . . . 7B-73

Outside Air Temperature Sensor Inspection . .7B-73
Air Flow Control Actuator Removal and

Installation . . . . . . . . . . . . . ...7B-73

Air Flow Control Actuator Inspection. . . . .7B-73
Air Intake Control Actuator Removal and

Installation . . . . . . . . . . . . . ...7B-74

Air Intake Control Actuator Inspection. . . ...7B-74
Temperature Control Actuator Removal and

Installation . . . . . . . . . . . . . ...7B-74

Temperature Control Actuator Inspection . . .7B-74
HVAC Control Module Removal and

Installation . . . . . . . . . . . . . ...7B-74

A/C Compressor Drive Belt Inspection and

Adjustment . . . . . . . . . . . . . ..7B-74

A/C Compressor Drive Belt Removal and

Installation . . . . . . . . . . . . . ...7B-74

A/C Compressor Relay Inspection . . . . . 7B-74
Compressor Assembly On-Vehicle Inspection ..7B-75
Compressor Assembly Removal and

Installation for M16 Engine Model. . . . ...7B-75

Compressor Assembly Removal and

Installation for J20 Engine Model . . . . . 7B-76

Magnet Clutch Components for M16 Engine

Model . . . . . . . . . . . . . . . ..7B-77

Table of Contents 7-iii

Magnet Clutch Components for J20 Engine

Model . . . . . . . . . . . . . . . .. 7B-78

Magnet Clutch Operating Check for M16

Engine Model . . . . . . . . . . . . .. 7B-78

Magnet Clutch Operating Check for J20

Engine Model . . . . . . . . . . . . .. 7B-78

Magnet Clutch Removal and Installation for

M16 Engine Model . . . . . . . . . . ..7B-79

Magnet Clutch Removal and Installation for

J20 Engine Model . . . . . . . . . . ... 7B-81

Thermal Switch On-Vehicle Inspection for

M16 Engine Model . . . . . . . . . . ..7B-83

Thermal Switch Removal and Installation for

M16 Engine Model . . . . . . . . . . ..7B-83

Relief Valve On-Vehicle Inspection for M16

Engine Model . . . . . . . . . . . . ..7B-83

Relief Valve On-Vehicle Inspection For J20

Engine Model . . . . . . . . . . . . ..7B-83

Relief Valve Removal and Installation for M16

Engine Model . . . . . . . . . . . . ..7B-84

Specifications. . . . . . . . . . . . . .7B-84

Tightening Torque Specifications. . . . . ..7B-84

Special Tools and Equipment . . . . . . ...7B-85

Recommended Service Material . . . . . ...7B-85
Special Tool . . . . . . . . . . . . . ..7B-85

7-1 Precautions:

HVAC

Precautions

Precautions

Precautions for HVAC

S5JB0A7000001

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

S5JB0A7101001

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