Dtc B1552: Hvac Control Module Check Sum Error; Dtc B1553: Can Communication Circuit Malfunction - Suzuki SX4 Service Manual
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Also See for SX4:
- Owner's manual (47 pages) ,
- Owner's manual (18 pages) ,
- Owner's manual (16 pages)
Table of Contents
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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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Chapters
Table of Contents
Troubleshooting
Need help?
Do you have a question about the SX4 and is the answer not in the manual?
Questions and answers
Adjust throttle motor
The idle speed on a Suzuki SX4 should be controlled by the Idle Air Control Valve (IACV) rather than adjusting the idle screw on the throttle body, as the screw is factory set. Before using compressed air in the idle-air-bypass passages, the IACV should be removed to prevent damage to its delicate mechanism. If there is an issue with idle speed, checking the IACV function and referring to the SX4 service manual is recommended.
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I have an issue of crank but not starting When I scan it brought this codeU0100 Which means no communication thou crank sensor wire was cut off but it was fix back What could be wrong and what could be the solution,
My heater stopped working the blower **** is good, control unit ?
Possible issues with the heater in a Suzuki SX4 if the blower is working but the heater is not include:
1. Incorrect Temperature Output
- Temperature control cable broken or bent (non-A/C and manual A/C) → Check the temperature control cable.
- Temperature selector faulty (non-A/C and manual A/C) → Check the temperature selector.
- Incorrect installation of the temperature control cable (non-A/C and manual A/C) → Check and adjust the position as necessary.
- Temperature control door assembly broken → Repair the temperature control door assembly.
- Air ducts clogged → Repair air ducts.
- Heater core leaked or clogged → Replace the heater core.
- Heater hoses leaked or clogged → Replace heater hoses.
- Thermostat faulty → Check the thermostat.
- Temperature control actuator faulty (auto A/C) → Check the temperature control actuator.
- HVAC control module faulty (auto A/C) → Check the HVAC control module.
- Wiring or grounding faulty (auto A/C) → Repair as necessary.
2. Other Possible Causes
- Air flow control cable broken or bent → Check the air flow control cable.
Checking and addressing these components should help identify and resolve the heater issue.
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دلایل بالا رفتن مصرف بنزین در مدل اتومات
increasing revs when changing gears
The Suzuki SX4 may have increasing revs when changing gears due to its drive-by-wire system and the difference in final drive ratios between the manual (4.41) and automatic (2.81) transmissions. This difference causes high cruising RPMs in the manual version and sluggishness in the automatic. Additionally, if the revs climb while going uphill, it may be due to the transmission downshifting or kicking out of overdrive. Other possible causes include low transmission fluid, abuse, or a faulty transmission design.
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