Suzuki Grand Vitara JB627. Manual - part 283

7B-48 Air Conditioning System: 

DTC B1531: Air Intake Control Actuator and/or Its Circuit Malfunction

S6JB0B7204022

Wiring Diagram

DTC Detecting Condition and Trouble Area

10 Position sensor signal circuit check

1) Measure voltage between “WHT/GRN” wire terminal of 

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

Is voltage 0 V?

Go to Step 11.

“WHT/GRN” 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 intake control actuator connector and vehicle body 
ground.

Is resistance below 5 

Ω

?

Go to Step 12.

Go to Step 13.

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 intake control actuator check

1) Check air intake control actuator referring to “Air Intake 

Control Actuator Inspection”.

Is it in good condition?

HVAC control module 
faulty.

Air intake control 
actuator faulty.

Step

Action

Yes

No

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 

DTC Detecting Condition

Trouble Area

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

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

Air Conditioning System:  7B-49

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 air intake selector at “FRE” position.
4) Select air intake selector at “REC” position and wait for 1 min. or more.
5) Check DTC.

DTC Troubleshooting

Step

Action

Yes

No

1

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 2.

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

2

Wire harness check
1) Disconnect connector from air intake control actuator 

with ignition switch turned OFF.

2) Check for proper connection to temperature control 

actuator connector at “ORN” and “GRN” wire terminals.

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

temperature control actuator connector and vehicle body 
ground with ignition switch turned ON when air intake 
selector is operation to FRE position.

Is voltage 10 – 14 V?

Go to Step 6.

Go to Step 3.

3

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 “G52-31” and “G52-32” terminals.

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

of air intake control actuator connector and “G52-31” 
terminal of HVAC control module connector.

Is resistance below 5 

Ω

?

Go to Step 4.

“ORN” wire open or high 
resistance circuit.

4

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

intake control actuator connector and vehicle body 
ground.

Is resistance infinity?

Go to Step 5.

“ORN” wire shorted to 
ground circuit.

5

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

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

Is voltage 0 V?

Go to Step 6.

“ORN” wire shorted to 
other circuit.

6

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

switch turned OFF.

2) Measure voltage between “GRN” wire terminal of air 

intake control actuator connector and vehicle body 
ground with ignition switch turned ON when temperature 
selector is operation to REC position.

Is voltage 10 – 14 V?

Go to Step 10.

Go to Step 7.

7B-50 Air Conditioning System: 

7

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 “G52-31” and “G52-32” terminals.

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

of air intake control actuator connector and “G52-32” 
terminal of HVAC control module connector.

Is resistance below 5 

Ω

?

Go to Step 8.

“GRN” wire open or high 
resistance circuit.

8

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

intake control actuator connector and vehicle body 
ground.

Is resistance infinity?

Go to Step 9.

“GRN” wire shorted to 
ground circuit.

9

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

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

Is voltage 0 V?

Go to Step 10.

“GRN” wire shorted to 
other circuit.

10 Position sensor circuit check

1) Check air intake control actuator position sensor circuit 

referring to Step 1 to Step 6 and Step 11 to Step 12 of 
“DTC B1530: Air Intake Control Actuator (Position 
Sensor) and/or Its Circuit Malfunction”.

Is it in good condition?

Go to Step 11.

Repair circuit.

11 Air intake control actuator check

1) Check intake air control actuator referring to “Air Intake 

Control Actuator Inspection”.

Is it in good condition?

HVAC control module 
faulty.

Air intake control 
actuator faulty.

Step

Action

Yes

No

Air Conditioning System:  7B-51

DTC B1546: A/C Refrigerant Pressure Malfunction

S6JB0B7204023

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 engine and warm up to normal operating temperature.
4) Start A/C system for 1 min. or more.
5) Check DTC.

DTC Troubleshooting

DTC Detecting Condition

Trouble Area

Outside temperature is more than specified value. However, refrigerant 
pressure is less than specified value.

• Refrigerant shortage
• Refrigerant pressure sensor circuit
• Refrigerant pressure sensor
• Outside air temperature sensor circuit
• Outside air temperature sensor
• HVAC control module
• ECM
• BCM

Step

Action

Yes

No

1

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

OFF.

2) Turn ON ignition switch and clear DTC.
3) Ignition switch turned OFF position.
4) Turn ON ignition switch and check DTC.

Is there DTC B1546?

Go to Step 2.

Confirm that vehicle A/C 
system condition 
referring “A/C System 
Performance 
Inspection”, and 
recheck DTC.

2

Refrigerant pressure check
1) Connect scan tool to DLC with ignition switch OFF.
2) Ignition switch ON turned ON position.
3) Check refrigerant pressure displayed on scan tool.

Is it 340 kPa or more?

Go to Step 3.

Charge refrigerant and 
Confirm that vehicle A/C 
system condition 
referring to “A/C System 
Performance 
Inspection”. And then 
recheck DTC.

3

A/C system check
1) Confirm that vehicle A/C system condition referring to 

“A/C System Performance Inspection”.

Is A/C system in good condition?

Go to Step 4.

Repair and/or replace.

4

Refrigerant pressure sensor check
1) Check refrigerant pressure sensor referring to “A/C 

Refrigerant Pressure Sensor and Its Circuit Inspection”.

Are refrigerant pressure sensor and/or its circuit in good 
condition?

Go to Step 5.

Repair circuit and/or 
replace refrigerant 
pressure sensor.

5

Outside temperature sensor check
1) Check outside temperature sensor referring to “Outside 

Air Temperature Sensor Inspection (If Equipped) in 
Section 9C”.

Is outside temperature sensor in good condition?

Replace HVAC control 
module.

Replace outside 
temperature sensor.