Suzuki Grand Vitara JB416 / JB420 / JB419. Service manual - part 389

7B-47 Air Conditioning System:

Wire harness check
1) Connect connector to HVAC control module with ignition

switch turned OFF.

2) Measure voltage between “GRY/BLU” wire terminal of

temperature control actuator connector and vehicle body
ground with ignition switch turned ON when temperature
selector is operation to HOT direction.

Is voltage 10 – 14 V?

Go to Step 11.

Go to Step 8.

Wire harness check
1) Disconnect connector from HVAC control module with

ignition switch turned OFF.

2) Check for proper connection to HVAC control module

connector at “G52-27” and “G52-28” terminals.

3) If OK, measure resistance between “GRY/BLU” wire

terminal of temperature control actuator connector and
“G52-28” terminal of HVAC control module connector.

Is resistance below 5

Ω

Go to Step 9.

“GRY/BLU” wire open or
high resistance circuit.

Wire harness check
1) Measure resistance between “GRY/BLU” wire terminal

of temperature control actuator connector and vehicle
body ground.

Is resistance infinity?

Go to Step 10.

“GRY/BLU” wire shorted
to ground circuit.

10 Wire harness check

1) Measure voltage between “GRY/BLU” wire terminal of

temperature control actuator connector and vehicle body
ground with ignition switch turned ON.

Is voltage 0 V?

Go to Step 11.

“GRY/BLU” wire shorted
to other circuit.

11 Position sensor circuit check

1) Check temperature control actuator position sensor

circuit referring to Step 1 to Step 6 and Step 11 to Step
12 of “DTC B1511: Temperature Control Actuator
(Position Sensor) and/or Its Circuit Malfunction”.

Is it in good condition?

Go to Step 12.

Repair circuit.

12 Temperature control actuator check

1) Check temperature control actuator referring to

“Temperature Control Actuator Inspection”.

Is it in good condition?

HVAC control module
faulty.

Temperature control
actuator faulty.

Step

Action

Yes

Air Conditioning System: 7B-48

DTC B1514: Air Flow Control Actuator and/or Its Circuit Malfunction

S6JB0A7204018

Wiring Diagram

DTC Detecting Condition and Trouble Area

DTC Confirmation Procedure

1) Connect scan tool to DLC with ignition switch turned OFF.
2) Turn ON ignition switch and clear DTC using scan tool.
3) Start A/C system and select mode selector at “DEF” position.
4) Select mode selector at “FOOT” position and wait for 1 minute.
5) Check DTC.

DTC Troubleshooting

12V

G52-23

G52-29

G52-30

G52-13

GRY/RED

GRY/BLK

RED/WHT

WHT/BLU

BLK/RED

G52-14

[A]

30 29

I5JB0A720026-01

[A]: HVAC control module connector “G52” (harness side view)

3. To other actuators

1. HVAC control module

4. To other sensors

2. Air flow control actuator

DTC Detecting Condition

Trouble Area

Difference between target opening and actual opening is more than specified
value even though air flow control actuator has operated for 15 seconds.

• Air flow control actuator circuit
• Air flow control linkage
• Air flow control actuator
• HVAC unit
• HVAC control module

Step

Action

Yes

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

OFF.

2) Turn ON ignition switch and check DTC.

Is there DTC B1512?

Go to applicable DTC
diag. flow.

Go to Step 2.

Visual check
1) Check if there is any obstruction in operating range of

actuator linkage and if actuator linkage operates
smoothly.

Is it in good condition?

Go to Step 3.

Obstruction in operating
range of actuator
linkage, actuator linkage
faulty and/or internal
fault of HVAC unit.

7B-49 Air Conditioning System:

Wire harness check
1) Disconnect connector from air flow control actuator with

ignition switch turned OFF.

2) Check for proper connection to air flow control actuator

connector at “GRY/RED” and “GRY/BLK” wire terminals.

3) If OK, measure voltage between “GRY/RED” wire

terminal of air flow control actuator connector and
vehicle body ground with ignition switch turned ON when
air flow selector is operation to VENT direction.

Is voltage 10 – 14 V?

Go to Step 7.

Go to Step 4.

Wire harness check
1) Disconnect connector from HVAC control module with

ignition switch turned OFF.

2) Check for proper connection to HVAC control module

connector at “G51-29” and “G51-30” terminals.

3) If OK, measure resistance between “GRY/RED” wire

terminal of air flow control actuator connector and “G51-
29” terminal of HVAC control module connector.

Is resistance below 5

Ω

Go to Step 5.

“GRY/RED” wire open
or high resistance
circuit.

Wire harness check
1) Measure resistance between “GRY/RED” wire terminal

of air flow control actuator connector and vehicle body
ground.

Is resistance infinity?

Go to Step 6.

“GRY/RED” wire
shorted to ground
circuit.

Wire harness check
1) Measure voltage between “GRY/RED” wire terminal of

air flow control actuator connector and vehicle body
ground with ignition switch turned ON.

Is voltage 0 V?

Go to Step 7.

“GRY/RED” wire
shorted to other circuit.

Wire harness check
1) Connect connector to HVAC control module with ignition

switch turned OFF.

2) Measure voltage between “GRY/BLK” wire terminal of

air flow control actuator connector and vehicle body
ground with ignition switch turned ON when air flow
selector is operation to DEF direction.

Is voltage 10 – 14 V?

Go to Step 11.

Go to Step 8.

Wire harness check
1) Disconnect connector from HVAC control module with

ignition switch turned OFF.

2) Check for proper connection to HVAC control module

connector at “G51-29” and “G51-30” terminals.

3) If OK, measure resistance between “GRY/BLK” wire

terminal of air flow control actuator connector and “G51-
30” terminal of HVAC control module connector.

Is resistance below 5

Ω

Go to Step 9.

“GRY/BLK” wire open or
high resistance circuit.

Wire harness check
1) Measure resistance between “GRY/BLK” wire terminal of

air flow control actuator connector and vehicle body
ground.

Is resistance infinity?

Go to Step 10.

“GRY/BLK” wire shorted
to ground circuit.

Step

Action

Yes

Air Conditioning System: 7B-50

DTC B1520: Temperature Selector and/or Its Circuit Malfunction

S6JB0A7204019

DTC Detecting Condition and Trouble Area

DTC Confirmation Procedure

1) Connect scan tool to DLC with ignition switch turned OFF.
2) Turn ON ignition switch and clear DTC using scan tool.
3) Turn temperature selector to the light and left as far as it stops, repeat it 10 seconds.
4) Check DTC.

DTC Troubleshooting

10 Wire harness check

1) Measure voltage between “GRY/BLK” wire terminal of

air flow control actuator connector and vehicle body
ground with ignition switch turned ON.

Is voltage 0 V?

Go to Step 11.

“GRY/BLK” wire shorted
to other circuit.

11 Position sensor circuit check

1) Check air flow control actuator position sensor circuit

referring to Step 1 to Step 6 and Step 11 to Step 12 of
“DTC B1512: Air Flow Control Actuator (Position
Sensor) and/or Its Circuit Malfunction”.

Is it in good condition?

Go to Step 12.

Repair circuit.

12 Air flow control actuator check

1) Check air flow control actuator referring to “Air Flow

Control Actuator Inspection”.

Is it in good condition?

HVAC control module
faulty.

Air flow control actuator
faulty.

Step

Action

Yes

DTC detecting condition

Trouble area

This DTC will be set when an internal malfunction is detected in the
HVAC control module.
Temperature selector signal voltage is more than or less than
specified value for specified time continuously.

HVAC control module (temperature selector)

Step

Action

Yes

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

OFF.

2) Turn ignition switch ON and clear DTC referring to “DTC

Clearance”.

3) Turn ignition switch OFF position.
4) Turn ignition switch ON and check DTC referring to

“DTC Check”.

Is there DTC B1520?

Go to Step 2.