Suzuki Grand Vitara JB416 / JB420 / JB419. Manual - part 388

7B-43 Air Conditioning System: 

DTC B1512: Air Flow Control Actuator (Position Sensor) and/or Its Circuit Malfunction

S6JB0A7204016

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) Check DTC.

DTC Troubleshooting

NOTE
When DTC B1502, B1503, B1511 and B1530 are indicated together, it is possible that “BLK/RED” wire 
circuit open.

 

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

I5JB0A720024-02

[A]: HVAC control unit 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

Air flow control actuator position sensor signal voltage is more than or less 
than specified value for specified time continuously.

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

Step

Action

Yes

No

1

Position sensor power supply circuit check
1) Disconnect air flow control actuator connector with 

ignition switch turned OFF.

2) Check for proper connection to air flow control actuator 

at “RED/WHT”, “WHT/BLU” and “BLK/RED” wire 
terminals.

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

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

Is voltage 4 – 6 V?

Go to Step 6.

Go to Step 2.

2

Position sensor power supply circuit check
1) Disconnect temperature control actuator connector with 

ignition switch turned OFF.

2) Measure voltage between “RED/WHT” wire terminal of 

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

Is voltage 4 – 6 V?

Temperature control 
actuator faulty.

Go to Step 3.

Air Conditioning System:  7B-44

3

Position sensor power supply circuit check
1) Disconnect air intake control actuator connector with 

ignition switch turned OFF.

2) Measure voltage between “RED/WHT” wire terminal of 

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

Is voltage 4 – 6 V?

Air intake control 
actuator faulty.

Go to Step 4.

4

Position sensor power supply circuit check
1) Disconnect connector from HVAC control module with 

ignition switch turned OFF.

2) Check for proper connection to HVAC control module 

connector at “G52-14”, “G52-13” and “G52-23” 
terminals.

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

terminal of air flow control actuator connector and “G52-
14” terminal of HVAC control module connector.

Is resistance below 5 

Ω

?

Go to Step 5.

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

5

Position sensor power supply circuit check
1) Measure resistance between “RED/WHT” wire terminal 

of air flow control actuator connector and vehicle body 
ground.

Is resistance infinity?

Go to Step 6.

“RED/WHT” wire 
shorted to ground 
circuit.

6

Position sensor power supply circuit check
1) Measure voltage between “RED/WHT” 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.

“RED/WHT” wire 
shorted to other circuit.

7

Position sensor signal circuit check
1) Connect HVAC control module connector with ignition 

switch turned OFF.

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

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

Is voltage 4 – 6 V?

Go to Step 11.

Go to Step 8.

8

Position sensor signal circuit check
1) Disconnect connector from HVAC control module with 

ignition switch turned OFF.

2) Measure resistance between “WHT/BLU” wire terminal 

of air flow control actuator connector and “G52-23” 
terminal of HVAC control module connector.

Is resistance below 5 

Ω

?

Go to Step 9.

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

9

Position sensor signal circuit check
1) Measure resistance between “WHT/BLU” wire terminal 

of air flow control actuator connector and vehicle body 
ground.

Is resistance infinity?

Go to Step 10. 

“WHT/BLU” wire 
shorted to ground 
circuit.

Step

Action

Yes

No

7B-45 Air Conditioning System: 

DTC B1513: Temperature Control Actuator and/or Its Circuit Malfunction

S6JB0A7204017

Wiring Diagram

DTC Detecting Condition and Trouble Area

10 Position sensor signal circuit check

1) Measure voltage between “WHT/BLU” 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.

“WHT/BLU” wire 
shorted to other circuit.

11 Position sensor ground circuit check

1) Connect HVAC control module connector with ignition 

switch turned OFF.

2) Measure resistance between “BLK/RED” wire terminal of 

air flow control actuator connector and vehicle body 
ground.

Is resistance below 5 

Ω

?

Go to Step 13.

Go to Step 12.

12 Position sensor ground circuit check

1) Measure resistance between “G52-13” terminal of HVAC 

control module connector and vehicle body ground.

Is resistance below 5 

Ω

?

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

HVAC control module 
faulty.

13 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

12V

5V

M

G52-21

G52-27

G52-28

GRY

GRY/BLU

WHT/RED

G52-13

G52-14

5V

RED/WHT

BLK/RED

[A]

2

3

4

1

13

14

21

27

28

I5JB0A720025-02

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

3. To other actuators

1. HVAC control module

4. To other sensors

2. Temperature control actuator

DTC Detecting Condition

Trouble Area

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

• Temperature control actuator circuit
• Temperature control linkage
• Temperature control actuator
• HVAC unit
• HVAC control module

Air Conditioning System:  7B-46

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 temperature selector at “MAX COOL” position or “MAX HOT” position.
4) Wait for 1 minute.
5) Check DTC.

DTC Troubleshooting

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 B1511?

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.

3

Wire harness check
1) Disconnect connector from temperature control actuator 

with ignition switch turned OFF.

2) Check for proper connection to temperature control 

actuator connector at “GRY” and “GRY/BLU” wire 
terminals.

3) If OK, measure voltage between “GRY” wire terminal of 

temperature control actuator connector and vehicle body 
ground with ignition switch turned ON when temperature 
selector is operation to COOL 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 “G52-27” and “G52-28” terminals.

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

of temperature control actuator connector and “G52-27” 
terminal of HVAC control module connector.

Is resistance below 5 

Ω

?

Go to Step 5.

“GRY” wire open or high 
resistance circuit.

5

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

temperature control actuator connector and vehicle body 
ground.

Is resistance infinity?

Go to Step 6.

“GRY” wire shorted to 
ground circuit.

6

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

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

Is voltage 0 V?

Go to Step 7.

“GRY” wire shorted to 
other circuit.