Suzuki 2006 SX4, Service Manual

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Air Conditioning System: Automatic Type 7B-72
DTC B1552: HVAC Control Module Check Sum Error
S6RW0C7224021
DTC Detecting Condition and Trouble Area
DTC Troubleshooting
DTC B1553: CAN Communication Circuit Malfunction
S6RW0C7224022
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 Was “Air Conditioning System Check” performed? Go to Step 2. Go to “Air Conditioning
System Check”.
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”?
Intermittent trouble.
Check for intermittent
referring to “Intermittent
and Poor Connection
Inspection in Section
00” Substitute a known-
good HVAC control
module and recheck.
If DTC is still detected
substitute a known-
good BCM and recheck.
DTC detecting condition Trouble area
HVAC control module receives error code from BCM continuously. • CAN communication circuit
• BCM
• ECM
• Combination meter
• HVAC control module
Step Action Yes No
1 Was “Air Conditioning System Check” performed? Go to Step 2. Go to “Air Conditioning
System Check”.
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?
Go to applicable DTC
diag. flow. Substitute a known-
good HVAC control
module and recheck.