Suzuki Grand Vitara JB627. Manual — part 282

7B-44 Air Conditioning System:

DTC B1520: Temperature Selector and/or Its Circuit Malfunction

S6JB0B7204019

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-45

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

S6JB0B7204020

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 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.

7B-46 Air Conditioning System:

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

S6JB0B7204021

Wiring Diagram

DTC Detecting Condition and Trouble Area

NOTE
When DTC B1502, B1503, B1511 and B1512 are indicated together, it is that “BLK/RED” wire circuit
open.

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

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

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

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

Step

Action

Yes

No

1

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

ignition switch turned OFF.

2) Check for proper connection to air intake control actuator

at “RED/WHT”, “WHT/GRN” 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 intake 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-47

3

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

ignition switch turned OFF.

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

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

Is voltage 4 – 6 V?

Air flow 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”, “G52-22” and “G52-13”
terminals.

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

terminal of air intake 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 intake 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/GRN” wire terminal of

air intake 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/GRN” wire terminal

of air intake control actuator connector and “G52-22”
terminal of HVAC control module connector.

Is resistance below 5

Ω

?

Go to Step 9.

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

9

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

of air intake control actuator connector and vehicle body
ground.

Is resistance infinity?

Go to Step 10.

“WHT/GRN” wire
shorted to ground
circuit.

Step

Action

Yes

No