Suzuki Grand Vitara JB419. Service manual - part 122

 

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Suzuki Grand Vitara JB419. Service manual - part 122

 

 

7A-1 Heater and Ventilation: 

HVAC

Heater and Ventilation

General Description

Additional Heater System Description

S5JB0B7101005

This system, consisting of ECM, additional heater 
assembly and 3 relays, warms up the engine coolant 
which flows through the heater core while the engine is 
warmed up, thereby promoting interior heating. It is not 
activated during pre/post heating by glow plug. Not 
during pre/post heating by glow plug, it is activated on 
the following conditions.
• Ten seconds have passed after the engine start.
• The battery voltage is more than 12.2 V.
• The engine speed is more than 700 rpm.
• The engine coolant and the intake air temperature is 

as shown in the graph below.

Schematic and Routing Diagram

Electronic Control Input / Output Diagram (for Vehicle without A/C)

S5JB0B7102002

[A]: Engine coolant temperature (

°C)

[C]: ON

[B]: Intake air temperature (

°C)

[D]: OFF

0

0

5

10

10

-10

20

30

40

50

60

70

75

15

25

20

[B]

[A]

[C]

[D]

I5JB0B710001-03

Temperature selector

MODE (air flow) selector

Blower speed selector

Air intake selector

Wheel 
speed 
sensor

Blower motor controller

Temperature control actuator

Air flow control actuator

Air intake control actuator

BCM

ABS control module or
ESP

®

 control module

Data link connector

HVAC control module

CPU

ECT sensor

ECM

CMP sensor

*

*

Additional heater relay

I5JB0B710002-02

*: CAN communication

Heater and Ventilation:  7A-2

Additional Heater System Input / Output Diagram

S5JB0B7102004

Component Location

Additional Heater System Component Location

S5JB0B7103002

Additional heater relay No.1 

Additional heater relay No.2 

Additional heater relay No.3 

CKP senser

IAT sencer

Battery voltage

ECT senser

ECM

I5JB0B710003-02

1

3

4

5

2

I5JB0B710004-01

1. Additional heater assembly

3. Additional heater relay No.1

5. Additional heater relay No.3

2. ECM

4. Additional heater relay No.2

7A-3 Heater and Ventilation: 

Diagnostic Information and Procedures

Heater and Ventilation Symptom Diagnosis

S5JB0B7104008

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 in related manual”.

Blower motor relay faulty

Check relay referring to “Blower Motor Relay 
Inspection in related manual”.

Blower motor controller faulty

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

Blower speed selector faulty

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

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 in related manual”.

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 in 
related manual”.

Temperature selector faulty

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

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 in related manual”.

Air flow control actuator faulty

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

Mode selector faulty

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

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 in related manual”.

Air intake selector faulty

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

Wiring or grounding faulty

Repair or replace as necessary.

 

 

 

 

 

 

 

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