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Dtc B1552: Hvac Control Module Check Sum Error; Dtc B1553: Can Communication Circuit Malfunction - Suzuki SX4 Service Manual

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Step
4
Serial communication signal check
1) Connect connectors to BCM and HVAC control module
with ignition switch turned OFF.
2) Turn ignition switch to ON position.
3) Check that serial communication signal is outputted from
BCM referring to "Voltage Check" under "Inspection of
BCM and Its Circuits in Section 10B".
Is serial communication signal outputted?
5
Communication data check
1) Connect connector to information display with ignition
switch turned OFF.
2) Check that serial communication signal is outputted from
BCM referring to "Voltage Check" under "Inspection of
BCM and Its Circuits in Section 10B".
Is serial communication signal outputted?

DTC B1552: HVAC Control Module Check Sum Error

DTC Detecting Condition and Trouble Area
Data received by HVAC control module from BCM is erroneous continuously. • BCM
DTC Troubleshooting
Step
1
Was "Air Conditioning System Check" performed?
2
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" displayed on scan tool.
Are values of A/C refrigerant pressure sensor and outside air
temperature within specified ranges indicated in "Scan Tool
Data"?

DTC B1553: CAN Communication Circuit Malfunction

DTC Detecting Condition and Trouble Area
HVAC control module receives error code from BCM continuously.
Action
DTC detecting condition
Action
DTC detecting condition
Air Conditioning System: Automatic Type 7B-69
Yes
Replace information
display.
Substitute a known-
good HVAC control
module and recheck.
• HVAC control module
Yes
Go to Step 2.
Intermittent trouble.
Check for intermittent
referring to "Intermittent
and Poor Connection
Inspection in Section
00"
• CAN communication circuit
• BCM
• ECM
• Combination meter
• HVAC control module
No
Go to Step 5.
Substitute a known-
good BCM and recheck.
S7RW0A7224021
Trouble area
No
Go to "Air Conditioning
System Check:
Automatic Type".
Substitute a known-
good HVAC control
module and recheck.
If DTC is still detected
substitute a known-
good BCM and recheck.
S7RW0A7224022
Trouble area

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