Suzuki Grand Vitara JB416 / JB420. Manual - part 288

7B-43 Air Conditioning System: 

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

S5JB0A7204039

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

5V

M

5V

G52-23

G52-29

G52-30

G52-13

GRY/RED

GRY/BLK

RED/WHT

WHT/BLU

BLK/RED

G52-14

[A]

2

3

4

1

13

14

30 29

23

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

No

1

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.

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.

Air Conditioning System:  7B-44

3

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.

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.

5

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.

6

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.

7

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.

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.

9

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

No

7B-45 Air Conditioning System: 

DTC B1520: Temperature Selector and/or Its Circuit Malfunction

S5JB0A7204021

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

No

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

No

1

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.

Intermittent trouble. 
Check for intermittent 
referring to “Intermittent 
and Poor Connection 
Inspection in Section 
00”.

2

HVAC control module terminal check
1) Remove HVAC control module referring to “HVAC 

Control Module Removal and Installation in Section 7A”.

2) Check for proper connection of HVAC control module 

connector at all terminals.

Is it in good condition?

Substitute a known-
good HVAC control 
module and recheck.

Repair faulty condition.

Air Conditioning System:  7B-46

DTC B1521: Blower Speed Selector and/or Its Circuit Malfunction

S5JB0A7204022

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 blower speed selector to the light and left as far as it stops, repeat it 10 seconds.
4) Check DTC.

DTC Troubleshooting

DTC B1530: Air Intake Control Actuator (Position Sensor) and/or Its Circuit Malfunction

S5JB0A7204040

Wiring Diagram

DTC detecting condition

Trouble area

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

HVAC control module (blower speed selector)

Step

Action

Yes

No

1

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 B1521?

Go to Step 2.

Intermittent trouble. 
Check for intermittent 
referring to “Intermittent 
and Poor Connection 
Inspection in Section 
00”.

2

HVAC control module terminal check
1) Remove HVAC control module referring to “HVAC 

Control Module Removal and Installation in Section 7A”.

2) Check for proper connection of HVAC control module 

connector at all terminals.

Is it in good condition?

Substitute a known-
good HVAC control 
module and recheck.

Repair faulty condition.

12V

5V

M

5V

G52-22

G52-31

G52-32

G52-13

RED/WHT

G52-14

BLK/RED

GRN

WHT/GRN

ORN

[A]

2

3

4

1

13

14

22

32 31

I5JB0A720027-01

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

3. To other actuators

1. HVAC control module

4. To other sensors

2. Air intake control actuator