Suzuki GRAND VITARA User Manual

7B-53 Air Conditioning System:
DTC B1552: Serial Communication Circuit Malfunction
S5JB0A7204044
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 B1553: CAN Communication Circuit Malfunction
S5JB0A7204045
DTC Detecting Condition and Trouble Area
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.
DTC detecting condition Trouble area
HVAC control module receives error code from BCM continuously. • CAN communication circuit
•BCM
•ECM
• HVAC control module
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.

Suzuki GRAND VITARA Specifications

General

Brand	Suzuki
Model	GRAND VITARA
Category	Automobile
Language	English