Suzuki Swift Sport 2004 User Manual

7B-64 Air Conditioning System: Automatic Type
DTC Detecting Condition and Trouble Area
DTC Troubleshooting
DTC B1552: Serial Communication Signal Malfunction
S7RS0B7224020
DTC Detecting Condition and Trouble Area
DTC detecting condition Trouble area
Serial communication signal is higher than or lower than specified value for
specified time continuously.
• Serial communication line of BCM
• BCM (included in junction block
assembly)
• Information display
• HVAC control module
Step Action Yes No
1 DTC check
1) Connect scan tool to DLC with ignition switch turned
OFF.
2) Disconnect connector from information display.
3) Turn ignition switch ON and check DTC.
Is there DTC B1551?
Go to Step 2. Information display
faulty.
2 Wire harness check
1) Disconnect connectors from BCM and HVAC control
module.
2) Measure resistance between “G37-11” terminal of BCM
connector and “G51-7” terminal of HVAC control module
connector.
Is resistance below 5
Ω ?
Go to Step 3. “YEL” wire open or high
resistance circuit.
3 Wire harness check
1) Measure resistance between “G51-7” terminal of HVAC
control module connector and vehicle body ground.
Is resistance infinity?
Go to Step 4. “YEL” wire shorted to
ground circuit.
4 Wire harness check
1) Measure voltage between “G51-7” terminal of HVAC
control module connector and vehicle body ground with
ignition switch turned ON.
Is voltage 0 V?
Go to Step 5. “YEL” wire shorted to
other circuit.
5 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?
HVAC control module
faulty.
BCM (included in
junction block
assembly) faulty.
DTC detecting condition Trouble area
Data received by HVAC control module from BCM is erroneous continuously. • BCM (included in junction block
assembly)
• HVAC control module

Suzuki Swift Sport 2004 Specifications

General

Brand	Suzuki
Model	Swift Sport 2004
Category	Automobile
Language	English