Dtc B1552: Hvac Control Module Check Sum Error; Dtc B1553: Can Communication Circuit Malfunction - Suzuki 2006 SX4 Service Manual

7B-72 Air Conditioning System: Automatic Type

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.
DTC Troubleshooting
Step
1 Was "Air Conditioning System Check" performed?
2 DTC check
1) Connect scan tool to DLC with ignition switch turned
OFF.
2) Check DTC in BCM.
Is DTC U0073 (No.0073), U0100 (No.0100) and/or U0155
(No.0155) detected?
DTC detecting condition
Action
DTC detecting condition
Action
Trouble area
• HVAC control module
Yes
Go to Step 2.
Intermittent trouble.
Check for intermittent
referring to "Intermittent
and Poor Connection
Inspection in Section
00"
Trouble area
• CAN communication circuit
• BCM
• ECM
• Combination meter
• HVAC control module
Yes
Go to Step 2.
Go to applicable DTC
diag. flow.
S6RW0D7224021
No
Go to "Air Conditioning
System Check".
Substitute a known-
good HVAC control
module and recheck.
If DTC is still detected
substitute a known-
good BCM and recheck.
S6RW0D7224022
No
Go to "Air Conditioning
System Check".
Substitute a known-
good HVAC control
module and recheck.