Suzuki Grand Vitara JB627. Manual — part 279

7B-32 Air Conditioning System:

DTC Troubleshooting

NOTE
When DTC B1502, B1511, B1512 and B1530 are indicated together, it is possible that “BLK/RED” wire
circuit open.

Step

Action

Yes

No

1

Evaporator temperature sensor signal circuit check
1) Disconnect evaporator temperature sensor connector

with ignition switch turned OFF.

2) Check for proper connection to evaporator temperature

sensor at “WHT/BLK” and “BLK/RED” wire terminals.

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

terminal of evaporator temperature sensor connector
and vehicle body ground with ignition switch turned ON.

Is voltage 4 – 6 V?

Go to Step 5.

Go to Step 2.

2

Evaporator temperature sensor signal 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 “G52-19” and “G52-13” terminals.

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

terminal of evaporator temperature sensor connector
and “G52-19” terminal of HVAC control module
connector.

Is resistance below 5

Ω

?

Go to Step 3.

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

3

Evaporator temperature sensor signal circuit check
1) Measure resistance between “WHT/BLK” wire terminal

of evaporator temperature sensor connector and vehicle
body ground.

Is resistance infinity?

Go to Step 4.

“WHT/BLK” wire
shorted to ground
circuit.

4

Evaporator temperature sensor signal circuit check
1) Measure voltage between “WHT/BLK” wire terminal of

evaporator temperature sensor connector and vehicle
body ground with ignition switch turned ON.

Is voltage 0 V?

Go to Step 5.

“WHT/BLK” wire
shorted to other circuit.

5

Evaporator temperature sensor ground circuit check
1) Connect HVAC control module connector with ignition

switch turned OFF.

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

evaporator temperature sensor connector and vehicle
body ground.

Is resistance below 5

Ω

?

Go to Step 7.

Go to Step 6.

6

Evaporator temperature 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.

7

Evaporator temperature sensor check
1) Check evaporator temperature sensor referring to “A/C

Evaporator Temperature Sensor Inspection”.

Is it in good condition?

HVAC control module
faulty.

Evaporator temperature
sensor faulty.

Air Conditioning System: 7B-33

DTC B1504: Sunload Sensor and/or Its Circuit Malfunction

S6JB0B7204014

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

5V

PNK

YEL

G52-18

G52-12

[A]

2

1

12

18

I5JB0A720022-01

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

1. HVAC control module

2. Sunload sensor

DTC Detecting Condition

Trouble Area

Sunload sensor signal voltage is more than or less than specified value for
specified time continuously.

• Sunload sensor circuit
• Sunload sensor
• HVAC control module

Step

Action

Yes

No

1

Sunload sensor power supply circuit check
1) Disconnect sunload sensor connector with ignition

switch turned OFF.

2) Check for proper connection to sunload sensor at “PNK”

and “YEL” wire terminals.

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

sunload sensor connector and vehicle body ground with
ignition switch turned ON.

Is voltage 4 – 6 V?

Go to Step 5.

Go to Step 2.

2

Sunload 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 “G52-12” and “G52-18” terminals.

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

of sunload sensor connector and “G52-12” terminal of
HVAC control module connector.

Is resistance below 5

Ω

?

Go to Step 3.

“PNK” wire open or high
resistance circuit.

3

Sunload sensor power supply circuit check
1) Measure resistance between “PNK” wire terminal of

sunload sensor connector and vehicle body ground.

Is resistance infinity?

Go to Step 4.

“PNK” wire shorted to
ground circuit.

4

Sunload sensor power supply circuit check
1) Measure voltage between “PNK” wire terminal of

sunload sensor connector and vehicle body ground with
ignition switch turned ON.

Is voltage 0 V?

Go to Step 5.

“PNK” wire shorted to
other circuit.

7B-34 Air Conditioning System:

DTC B1511: Temperature Control Actuator (Position Sensor) and/or Its Circuit Malfunction

S6JB0B7204015

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.

5

Sunload sensor signal circuit check
1) Disconnect HVAC control module connector with ignition

switch turned OFF.

2) Measure resistance between “YEL” wire terminal of

sunload sensor connector and vehicle body ground.

Is resistance infinity?

Go to Step 6.

“YEL” wire shorted to
ground circuit.

6

Sunload sensor signal circuit check
1) Measure resistance between “G52-12” terminal of HVAC

control module connector and “YEL” wire terminal of
sunload sensor connector.

Is resistance below 5

Ω

?

Go to Step 7.

“YEL” wire open or high
resistance circuit.

7

Sunload sensor signal circuit check
1) Measure voltage between “YEL” wire terminal of sunload

sensor connector and vehicle body ground with ignition
switch turned ON.

Is voltage 0 V?

Go to Step 8.

“YEL” wire shorted to
other circuit.

8

Sunload sensor check
1) Check sunload sensor referring to “Sunload Sensor

Inspection”.

Is it in good condition?

HVAC control module
faulty.

Sunload sensor 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

I5JB0A720023-02

[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

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

• Temperature control actuator circuit
• Temperature control actuator
• HVAC control module

Air Conditioning System: 7B-35

DTC Troubleshooting

NOTE
When DTC B1502, B1503, B1512 and B1530 are indicated together, it is possible that “BLK/RED” wire
circuit open.

Step

Action

Yes

No

1

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

ignition switch turned OFF.

2) Check for proper connection to temperature control

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

3) If OK, 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?

Go to Step 6.

Go to Step 2.

2

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

temperature 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 3.

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”, “G52-27” and “G52-21”
terminals.

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

terminal of temperature 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 temperature 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

temperature 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.