Suzuki Grand Vitara JB416 / JB420 / JB419. Manual — part 392

7B-59 Air Conditioning System:

DTC B1552: Serial Communication Circuit Malfunction

S6JB0A7204025

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

DTC detecting condition

Trouble area

Data received by HVAC control module from BCM is erroneous continuously. • BCM

• HVAC control module

Step

Action

Yes

No

1

Serial communication signal data check
1) Connect scan tool to DLC with ignition switch turned

OFF.

2) Start engine and select “DATA LIST” mode on scan tool.
3) Check “Refrigerant Pressure”, “Vehicle Speed”, “Coolant

Temp” and “Outside Air Temp” varies displayed on scan
tool.

Is displayed each varies described varies in “Scan Tool
Data”?

Intermittent trouble.
Check for intermittent
referring to “Intermittent
and Poor Connection
Inspection in Section
00”.

Go to Step 2.

2

Serial communication signal check
1) Connect connectors to BCM and HVAC control module.
2) Using oscilloscope, check that serial communication

signal at “G30-5” is outputted referring to “Voltage
Check” of “Inspection of BCM and Its Circuits in Section
10B”.

Is serial communication signal outputted at “G30-5” terminal
of BCM connector?

HVAC control module
faulty.

BCM (included in
junction block
assembly) faulty.

Air Conditioning System: 7B-60

DTC B1553: CAN Communication Circuit Malfunction

S6JB0A7204026

DTC Detecting Condition and Trouble Area

DTC Troubleshooting

DTC B1556: Camshaft Position (CMP) Sensor and/or Its Circuit Malfunction

S6JB0A7204027

DTC Detecting Condition and Trouble Area

DTC Troubleshooting

DTC detecting condition

Trouble area

HVAC control module receives error code from BCM continuously.

• CAN communication circuit
• Steering angle sensor (if equipped)
• Keyless start control module (if

equipped)

• 4WD control module (if equipped)
• TCM (if equipped)
• Combination meter
• ABS/ESP

® control module

• BCM
• HVAC control module
• ECM

Step

Action

Yes

No

1

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

OFF.

2) Check ECM and BCM for DTC.

Is there DTC(s)?

Go to applicable DTC
diag. flow.

Substitute a known-
good HVAC control
module and recheck.

DTC detecting condition

Trouble area

HVAC control module receives error code from BCM continuously.

• CMP sensor circuit
• CMP sensor
• HVAC control module

Step

Action

Yes

No

1

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

OFF.

2) Check ECM for DTC.

Is there DTC P0340?

Go to applicable DTC
diag. flow.

Substitute a known-
good HVAC control
module and recheck.

7B-61 Air Conditioning System:

DTC B1557: Wheel Speed Sensor and/or Its Circuit Malfunction

S6JB0A7204028

DTC Detecting Condition and Trouble Area

DTC Troubleshooting

DTC B1561: Engine Coolant Temperature Sensor and/or Its Circuit Malfunction

S6JB0A7204029

DTC Detecting Condition and Trouble Area

DTC Troubleshooting

DTC detecting condition

Trouble area

HVAC control module receives error code from BCM continuously.

• Wheel speed sensor circuit
• Wheel speed sensor
• ABS/ESP

® control module

• HVAC control module

Step

Action

Yes

No

1

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

OFF.

2) Check ABS/ESP

® control module for DTC.

Is there DTC C1021, C1022 / C1025, C1026 / C1031,
C1032 / C1035, C1036?

Go to applicable DTC
diag. flow.

Substitute a known-
good HVAC control
module and recheck.

DTC detecting condition

Trouble area

HVAC control module receives error code from BCM continuously.

• ECT sensor circuit
• ECT sensor
• HVAC control module

Step

Action

Yes

No

1

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

OFF.

2) Check ECM for DTC.

Are there DTC P0115 (diesel engine model), P0116, P0117
or P0118? (petrol engine model)

Go to applicable DTC
diag. flow.

Substitute a known-
good HVAC control
module and recheck.

Air Conditioning System: 7B-62

DTC B1562: Outside Air Temperature Sensor and/or Its Circuit Malfunction

S6JB0A7204030

DTC Detecting Condition and Trouble Area

DTC Troubleshooting

DTC B1563: A/C Refrigerant Pressure Sensor and/or Its Circuit Malfunction

S6JB0A7204031

DTC Detecting Condition and Trouble Area

DTC Troubleshooting

DTC detecting condition

Trouble area

HVAC control module receives error code from BCM continuously.

• Outside air temperature sensor

circuit

• Outside air temperature sensor
• HVAC control module

Step

Action

Yes

No

1

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

OFF.

2) Check BCM for DTC.

Are there DTC B1141, B1142 or B1143?

Go to applicable DTC
diag. flow.

Substitute a known-
good HVAC control
module and recheck.

DTC detecting condition

Trouble area

HVAC control module receives error code from BCM continuously.

• A/C refrigerant pressure sensor

circuit

• A/C refrigerant pressure sensor
• HVAC control module

Step

Action

Yes

No

1

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

OFF.

2) Check ECM for DTC.

Are there DTC P0532 or P0533?

Go to applicable DTC
diag. flow.

Substitute a known-
good HVAC control
module and recheck.