Suzuki Grand Vitara JB627. Service manual - part 269

7A-8 Heater and Ventilation: 

Heater and Ventilation Symptom Diagnosis

S6JB0B7104008

Condition

Possible cause

Correction / Reference Item

Blower won’t work even 
when blower speed 
selector is ON

Blower fuse blown

Replace fuse to check for short.

Blower motor faulty

Check blower motor referring to “Blower Motor 
Inspection”.

Blower motor relay faulty

Check relay referring to “Blower Motor Relay 
Inspection”.

Blower motor controller faulty

Check blower motor controller referring to 
“Blower Motor Controller Inspection”.

Blower speed selector faulty

Check HVAC control module referring to 
“HVAC Control Module and Its Circuits 
Inspection (for Vehicle without A/C)” or “HVAC 
Control Module and Its Circuits Inspection in 
Section 7B”.

Wiring or grounding faulty

Repair as necessary.

Air temperature is not 
changed even when 
temperature selector is 
changed

Temperature control door broken

Repair Temperature control door.

Linkage broken

Check actuator linkage referring to “Actuator 
Linkage Inspection”.

Heater hoses leaking or clogged

Replace hoses.

Heater core leaking or clogged

Replace heater core referring to “Heater Core 
Removal and Installation”.

Temperature control actuator faulty

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

Temperature selector faulty

Check HVAC control module referring to 
“HVAC Control Module and Its Circuits 
Inspection (for Vehicle without A/C)” or “HVAC 
Control Module and Its Circuits Inspection in 
Section 7B”.

Air outlet port is not 
changed when air flow 
selector is changed

Air flow control door broken 

Repair air flow control door.

Linkage broken

Check actuator linkage referring to “Actuator 
Linkage Inspection”.

Air flow control actuator faulty

Check air flow control actuator referring to “Air 
Flow Control Actuator Inspection”.

Mode selector faulty

Check HVAC control module referring to 
“HVAC Control Module and Its Circuits 
Inspection (for Vehicle without A/C)” or “HVAC 
Control Module and Its Circuits Inspection in 
Section 7B”.

No fresh air inlet is 
changed.

Fuse blown

Check related fuses and check for short circuit 
to ground.

Air intake control actuator faulty

Check air intake control actuator.

Air intake control door broken

Repair air intake control door.

Linkage broken

Check actuator linkage referring to “Actuator 
Linkage Inspection”.

Air intake selector faulty

Check HVAC Control module referring to 
“HVAC Control Module and Its Circuits 
Inspection (for Vehicle without A/C)” or “HVAC 
Control Module and Its Circuits Inspection in 
Section 7B”.

Wiring or grounding faulty

Repair or replace as necessary.

Heater and Ventilation:  7A-9

Repair Instructions

Blower Unit and Heater Unit Components

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As heater unit and blower unit are incorporated as an 
assembly named HVAC unit, they cannot be removed 
individually from vehicle body.
Same HVAC unit is used whether vehicle is equipped 
with A/C system or not.
For components of HVAC unit, refer to “HVAC Unit 
Components in Section 7B”.

HVAC Unit Removal and Installation (for Vehicle 
without A/C)

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Refer to “HVAC Unit Removal and Installation in Section 
7B”.

HVAC Air Filter Removal and Installation (for 
Vehicle without A/C)

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Refer to “HVAC Air Filter Removal and Installation in 
Section 7B”.

HVAC Air Filter Inspection (for Vehicle without 
A/C)

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Refer to “HVAC Air Filter Inspection in Section 7B”.

Blower Motor Removal and Installation

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Removal

1) Disconnect negative (–) cable at battery.
2) Disable air bag system referring to “Disabling Air 

Bag System in Section 8B”.

3) Disconnect blower motor lead wire (2) at coupler.
4) Remove blower motor (1) from HVAC unit.

Installation

1) Reverse removal procedure for installation.
2) Enable air bag system referring to “Enabling Air Bag 

System in Section 8B”.

Blower Motor Inspection

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• Check continuity between terminals as shown in the 

figure.
If check result is continuity, proceed to next operation 
check. If not, replace.

• Check for operation and electric current.

a. Put blower motor (1) in a soft-jawed vise.
b. Connect battery to blower motor as shown.
c. Check if blower motor operates smoothly without 

noise.

d. Check if ammeter indicates the specified current.

If measured current is out of specification, replace 
blower motor.

Specified current for blower motor
Approx. 12 A at 12 V

1

2

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1

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7A-10 Heater and Ventilation: 

Blower Motor Controller Removal and 
Installation

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Removal

1) Disconnect negative (–) cable at battery.
2) Disable air bag system referring to “Disabling Air 

Bag System in Section 8B”.

3) Remove glove box.
4) Remove passenger lower member.
5) Disconnect blower motor controller coupler (3).
6) Remove blower motor controller (1) by loosening its 

fastening screws (2).

Installation

1) Reverse removal procedure.
2) Enable air bag system referring to “Enabling Air Bag 

System in Section 8B”.

Blower Motor Controller Inspection

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Check controller for operation as follows.
• Using service wire, connect battery positive terminal 

to “1” terminal (1) of blower motor controller (6) and 
battery negative terminal to “2” terminal (2) of blower 
motor controller.

• Using bulb (3.4 W) (4) and service wire, connect 

battery positive terminal to “3” terminal (3) of blower 
motor controller as shown figure.

• Arrange 3 new 1.5 V batteries (5) in series (check that 

total voltage is 4.5 – 5.0 V) and connect its positive 
terminal to “3” terminal of blower motor controller and 
negative terminal to “2” terminal of blower motor 
controller. Then, check that bulb lights. If bulb does 
not light under the above conditions, replace blower 
motor controller.

3

1

2

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6

6

1

1

2

2

3

3

4

5

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Heater and Ventilation:  7A-11

Blower Motor Relay Inspection

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1) Disconnect negative (–) cable at battery.
2) Remove blower motor relay (1) from vehicle.
3) Check that there is no continuity between terminal 

“c” and “d”. If there is continuity, replace relay.

4) Connect battery positive (+) terminal to terminal “b” 

of relay.
Connect battery negative (–) terminal to terminal “a” 
of relay.
Check continuity between terminal “c” and “d”.
If there is no continuity when relay is connected to 
the battery, replace relay.

Heater Core Removal and Installation

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Removal

1) Remove instrument panel referring to “Instrument 

Panel Removal and Installation in Section 9C”.

2) Remove HVAC unit. Refer to “HVAC Unit Removal 

and Installation in Section 7B”.

3) Remove heater core pipe clamp and then, pull out 

heater core (1) from HVAC unit.

Installation

1) Install heater core by reversing removal procedure, 

noting the following items.
• When installing heater core, be careful not to 

damage fins of heater core.

• When installing each part, be careful not to catch 

any wiring harness.

2) Fill engine coolant to radiator.
3) Enable air bag system referring to “Enabling Air Bag 

System in Section 8B”.

1

“d”

“a”

“b”

“c”

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1

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