Suzuki Grand Vitara JB419. Service manual — part 127

Air Conditioning System: 7B-14

A/C System Symptom Diagnosis

S5JB0B7204009

Condition

Possible cause

Correction / Reference Item

No cool air comes out (A/
C system does not
operate)

No refrigerant

Perform recovery, evacuation and charge
referring to “Operation Procedure for Charging
A/C with Refrigerant”.

Fuse blown

Check related fuses, and then check for short
circuit to ground.

Evaporator temperature sensor faulty

Check evaporator temperature sensor
referring to “A/C Evaporator Temperature
Sensor Inspection in related manual”.

A/C refrigerant pressure sensor faulty

Check A/C refrigerant pressure sensor
referring to “A/C Refrigerant Pressure Sensor
and Its Circuit Inspection”.

Wiring or grounding faulty

Repair as necessary.

ECT sensor faulty

Check ECT sensor referring to “Engine
Coolant Temperature (ECT) Sensor Inspection
in Section 1C”.

ECM faulty

Check ECM.

HVAC control module faulty

Check HVAC control module referring to
“HVAC Control Module and Its Circuits
Inspection in related manual”.

Magnet clutch faulty

Check magnet clutch referring to “Magnet
Clutch Operating Check”.

Compressor drive belt loosened or
broken

Adjust or replace drive belt.

Compressor faulty

Check compressor.

Compressor relay faulty

Check compressor relay referring to “A/C
Compressor Relay Inspection”.

Temperature selector, blower speed
selector, and/or air flow selector faulty

Check HVAC control module referring to
“HVAC Control Module and Its Circuits
Inspection in related manual”.

BCM faulty

Check BCM referring to “Inspection of BCM
and its Circuits in Section 10B in related
manual”.

No cool air comes out
(radiator cooling fan
motor does not operate)

Fuse blown

Check related fuses, and then check for short
circuit to ground.

Wiring or grounding faulty

Repair as necessary.

Radiator cooling fan motor relay faulty

Check radiator cooling fan motor relay
referring to “Radiator Cooling Fan Relay
Inspection in Section 1F”.

Radiator cooling fan motor faulty

Check radiator cooling fan motor referring to
“Radiator Cooling Fan Motor On-Vehicle
Inspection in Section 1F”.

ECM faulty

Check ECM.

HVAC control module faulty

Check HVAC control module referring to
“HVAC Control Module and Its Circuits
Inspection in related manual”.

7B-15 Air Conditioning System:

No cool air comes out
(blower motor does not
operate)

Fuse blown

Check related fuses, and then check for short
circuit to ground.

Blower motor controller faulty

Check blower motor controller referring to
“Blower Motor Controller Inspection in Section
7A in related manual”.

Blower speed selector faulty

Check blower speed selector referring to
“HVAC Control Module and Its Circuits
Inspection in related manual”.

HVAC control module faulty

Check HVAC control module referring to
“HVAC Control Module and Its Circuits
Inspection in related manual”.

Wiring or grounding faulty

Repair as necessary.

Blower motor faulty

Check blower motor referring to “Blower Motor
Inspection in Section 7A in related manual”.

Blower motor relay faulty

Check blower motor relay referring to “Blower
Motor Relay Inspection in Section 7A in related
manual”.

Cool air does not come
out or insufficient cooling
(A/C system normal
operation)

Insufficient or excessive charge of
refrigerant

Check the amount of refrigerant and system
for leaks.

Condenser clogged

Check condenser referring to “A/C Condenser
Assembly On-Vehicle Inspection in related
manual”.

A/C evaporator clogged or frosted

Check A/C evaporator and evaporator
temperature sensor referring to “A/C
Evaporator Inspection in related manual” and
“A/C Evaporator Temperature Sensor
Inspection in related manual”.

Evaporator temperature sensor faulty

Check evaporator temperature sensor
referring to “A/C Evaporator Temperature
Sensor Inspection in related manual”.

Expansion valve faulty

Check expansion valve referring to “Expansion
Valve On-Vehicle Inspection in related
manual”.

Desiccant clogged

Check desiccant.

Compressor drive belt loosened or
broken

Adjust or replace drive belt.

Magnet clutch faulty

Check magnet clutch referring to “Magnet
Clutch Operating Check”.

Compressor faulty

Check compressor.

Air in A/C system

Replace desiccant, and then perform
evacuation and charge referring to “Operation
Procedure for Charging A/C with Refrigerant”.

Air leaking from HVAC unit or air duct

Repair as necessary.

Heater and ventilation system faulty

Check HVAC unit.

Temperature selector faulty

Check temperature selector referring to “HVAC
Control Module and Its Circuits Inspection in
related manual”.

HVAC control module faulty

Check HVAC control module referring to
“HVAC Control Module and Its Circuits
Inspection in related manual”.

Temperature control actuator faulty

Check temperature control actuator referring to
“Temperature Control Actuator Inspection in
related manual”.

Blower motor faulty

Check blower motor referring to “Blower Motor
Inspection in Section 7A in related manual”.

Excessive compressor oil in A/C system Drain excessive compressor oil from A/C

system circuit and compressor.

Condition

Possible cause

Correction / Reference Item

Air Conditioning System: 7B-16

DTC B1557: Wheel Speed Sensor and/or Its Circuit Malfunction

S5JB0B7204028

DTC Detecting Condition and Trouble Area

DTC Troubleshooting

Cool air does not come
out only intermittently

Wiring connection faulty

Repair as necessary.

Expansion valve faulty

Check expansion valve referring to “Expansion
Valve On-Vehicle Inspection in related
manual”.

Excessive moisture in A/C system

Replace desiccant, and then perform
evacuation and charge referring to “Operation
Procedure for Charging A/C with Refrigerant”.

Magnet clutch faulty

Check magnet clutch referring to “Magnet
Clutch Operating Check”.

Excessive amount of refrigerant

Check the amount of refrigerant.

Cool air comes out only at
high speed

Condenser clogged

Check condenser referring to “A/C Condenser
Assembly On-Vehicle Inspection in related
manual”.

Insufficient charge of refrigerant

Check the amount of refrigerant and system
for leaks.

Air in A/C system

Replace desiccant, and then perform
evacuation and charge referring to “Operation
Procedure for Charging A/C with Refrigerant”.

Compressor drive belt loosened or
broken

Adjust or replace drive belt.

Compressor faulty

Check compressor.

Cool air does not come
out only at high speed

Excessive amount of refrigerant

Check the amount of refrigerant.

A/C evaporator frosted

Check A/C evaporator and evaporator
temperature sensor referring to “A/C
Evaporator Inspection in related manual” and
“A/C Evaporator Temperature Sensor
Inspection in related manual”.

Insufficient air flow of
cooled air

A/C evaporator clogged or frosted

Check A/C evaporator and evaporator
temperature sensor referring to “A/C
Evaporator Inspection in related manual” and
“A/C Evaporator Temperature Sensor
Inspection in related manual”.

Air leaking from HVAC unit or air duct

Repair as necessary.

Blower motor faulty

Check blower motor referring to “Blower Motor
Inspection in Section 7A in related manual”.

Wiring or grounding faulty

Repair as necessary.

Condition

Possible cause

Correction / Reference Item

DTC detecting condition

Trouble area

HVAC control module receives error code from BCM continuously.

• Wheel speed sensor circuit
• ABS or ESP

® control module

• Wheel speed sensor
• HVAC control module

Step

Action

Yes

No

1

DTC check
1) Connect scan tool to DLC with ignition switch turned

OFF.

2) Check ABS or ESP

® for DTC.

Is there DTC C1021, C1022 / C1025, C1026 / C1031,
C1032 / C1035, C1036?

Go to applicable DTC
diag. flow.

Substitute a known-
good HVAC control
module and recheck.

7B-17 Air Conditioning System:

DTC B1561: Engine Coolant Temperature Sensor and/or Its Circuit Malfunction

S5JB0B7204029

DTC Detecting Condition and Trouble Area

DTC Troubleshooting

DTC B1563: A/C Refrigerant Pressure Sensor and/or Its Circuit Malfunction

S5JB0B7204031

DTC Detecting Condition and Trouble Area

DTC Troubleshooting

DTC detecting condition

Trouble area

HVAC control module receives error code from BCM continuously.

• ECT sensor circuit
• ECT sensor
• HVAC control module

Step

Action

Yes

No

1

DTC check
1) Connect scan tool to DLC with ignition switch turned

OFF.

2) Check ECM for DTC.

Is there DTC P0115?

Go to applicable DTC
diag. flow.

Substitute a known-
good HVAC control
module and recheck.

DTC detecting condition

Trouble area

HVAC control module receives error code from BCM continuously.

• A/C refrigerant pressure sensor

circuit

• A/C refrigerant pressure sensor
• HVAC control module
• ECM

Step

Action

Yes

No

1

DTC check
1) Connect scan tool to DLC with ignition switch turned

OFF.

2) Check ECM for DTC.

Are there DTC P0532 or P0533?

Go to applicable DTC
diag. flow.

Substitute a known-
good HVAC control
module and recheck.