Suzuki Grand Vitara JB627. Manual - part 281

7B-40 Air Conditioning System: 

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.

Air Conditioning System:  7B-41

7

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.

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.

9

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

No

7B-42 Air Conditioning System: 

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

S6JB0B7204018

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-43

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