Suzuki Grand Vitara JB416 / JB420. Manual — part 275

7A-6 Heater and Ventilation:

Description for Each Step
Step 1. Customer complaint analysis
Talk to customer, and then record details of the problem.

Customer questionnaire (example)

NOTE
The form is a standard sample. It should be modified according to conditions characteristic of each
market.

Step 2. Visual inspection
As a preliminary step, be sure to perform visual check of the items that support proper function of the heater and
ventilation referring to “Visual Inspection”.

Step 3. DTC check
Check DTC referring to “DTC Check”.

Step 4. Troubleshooting malfunction
Based on the DTC, perform an applicable DTC diagnostic flow and locate the cause of the trouble, namely in a sensor,
wire harness, connector, actuator, HVAC control module or other part and repair faulty parts.

Step 5. Heater and ventilation system symptom diagnosis
Check any part or system suspected to be a possible cause referring to “Heater and Ventilation Symptom Diagnosis”.

Step 6. Check for intermittent problem
Check any part where an intermittent trouble is easy to occur (e.g., wire harness, connector, etc.), referring to
“Intermittent and Poor Connection Inspection in Section 00” and related circuit of trouble cord recorded.

Step 7. Final confirmation test
Confirm if the problem symptom is troubleshooting and the heater and ventilation system is free from any abnormal
conditions. If there existed DTC, clear the DTC. Then, check if the DTC is still detected and if there is any other DTC.

Customer’s Name:

Model:

VIN:

Date of Issue:

Date of Reg.

Date of Problem:

Mileage:

Problem Symptoms

• REC indicator lamp and/or FRE indicator lamp abnormal: fails to turn on / fails to turn

off / flashes

• Abnormal noise while is working: from blower motor / from HVAC unit / from engine

room, other_______________

• Air intake selector dose not work:
• Blower speed selector dose not work:
• Temperature selector dose not work:
• Other:

Frequency of Occurrence

• Continuous / Intermittent (_____ times a day, a month) / other_______________

Conditions for Occurrence of
Problem

• Vehicle at stop & blower motor is working:
• For some time after blower speed selector is ON:
• When outside air temperature is high:
• When outside air temperature is low:
• All the time:

Environmental Condition

• Weather: fair / cloudy / rain / snow / other_______________
• Temperature: _____

°F (_____ °C)

Diagnostic Trouble Code

• First check: Normal code / malfunction code (__________)
• Second check: Normal code / malfunction code (__________)

Heater and Ventilation: 7A-7

Visual Inspection

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Check visually the following parts and systems.

DTC Check

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DTC check is the same as vehicle equipped with A/C system.
Refer to “DTC Check in Section 7B”.

DTC Clearance

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DTC clearance is the same as vehicle equipped with A/C system.
Refer to “DTC Clearance in Section 7B”.

DTC Table

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DTC table is the same as vehicle equipped with A/C system.
Refer to “DTC Table in Section 7B”.

Fail-Safe Table

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Fail-safe table is the same as vehicle equipped with A/C system.
Refer to “Fail-Safe Table in Section 7B”.

Scan Tool Data

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Scan tool data is the same as vehicle equipped with A/C system.
Refer to “Scan Tool Data in Section 7B”.

Inspection item

Correction

• Engine coolant
• Heater pipe and/or hose
• Battery
• Connectors of electric wire harness
• Fuses
• Parts
• Other parts that can be checked visually

• Leakage
• Disconnection, looseness and deterioration
• Fluid level and corrosion of terminal
• Disconnection and friction
• Burning
• Installation and damage

7A-8 Heater and Ventilation:

Heater and Ventilation Symptom Diagnosis

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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

I5JB0A710006-03

I5JB0A710007-01

1

I5JB0A710008-01