Dtc B1553: Can Communication Signal Malfunction; Dtc B1557: Vehicle Speed Sensor Signal Malfunction - Suzuki Swift Sport 2004 Service & Repair Manual

DTC Troubleshooting
Step
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"?
2 Serial communication signal check
1) Connect connectors to BCM and HVAC control module.
2) Using oscilloscope, check that serial communication
signal is outputted referring to "Reference waveform
No.8" of "Inspection of BCM and its Circuits in Section
10B".
Is serial communication signal outputted at "G37-11"
terminal of BCM connector?

DTC B1553: CAN Communication Signal Malfunction

DTC Detecting Condition and Trouble Area
HVAC control module receives error code from BCM continuously.
DTC Troubleshooting
Step
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)?

DTC B1557: Vehicle Speed Sensor Signal Malfunction

DTC Detecting Condition and Trouble Area
HVAC control module receives error code from BCM continuously.
DTC Troubleshooting
Step
1 DTC check
1) Connect scan tool to DLC with ignition switch turned
OFF.
2) Check ECM for DTC.
Is there DTC P0500?
Action
DTC detecting condition
Action
DTC detecting condition
Action
Air Conditioning System: Automatic Type 7B-65
Yes
Intermittent trouble.
Check for intermittent
referring to "Intermittent
and Poor Connection
Inspection in Section
00".
HVAC control module
faulty.
• CAN communication circuit
• BCM (included in junction block
assembly)
• ECM
• HVAC control module
Yes
Go to applicable DTC
diag. flow.
• VSS circuit
• VSS
• HVAC control module
Yes
Go to "DTC P0480: Fan
1 (Radiator Cooling
Fan) Control Circuit in
Section 1A".
No
Go to Step 2.
BCM (included in
junction block
assembly) faulty.
S7RS0B7224021
Trouble area
No
Substitute a known-
good HVAC control
module and recheck.
S7RS0B7224022
Trouble area
No
Substitute a known-
good HVAC control
module and recheck.