Suzuki Grand Vitara JB627. 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

S6JB0B7106001

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)

S6JB0B7106002

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

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

S6JB0B7106003

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

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

S6JB0B7106004

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

Blower Motor Removal and Installation

S6JB0B7106005

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

S6JB0B7106006

• 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

I5JB0A710006-03

I5JB0A710007-01

1

I5JB0A710008-01

7A-10 Heater and Ventilation:

Blower Motor Controller Removal and
Installation

S6JB0B7106007

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

S6JB0B7106008

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

I5JB0A710009-01

6

6

1

1

2

2

3

3

4

5

I5JB0A710010-01

Heater and Ventilation: 7A-11

Blower Motor Relay Inspection

S6JB0B7106009

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

S6JB0B7106010

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”

I5JB0A710011-01

1

I5JB0A710012-02