Suzuki GRAND VITARA User Manual

7B-51 Air Conditioning System:
DTC B1551: Serial Communication Circuit Malfunction
S5JB0A7204043
Wiring Diagram
DTC Detecting Condition and Trouble Area
DTC Confirmation Procedure
1) Connect scan tool to DLC with ignition switch turned OFF.
2) Turn ON ignition switch and clear DTC using scan tool.
3) Check DTC.
4 Refrigerant pressure sensor check
1) Check refrigerant pressure sensor referring to “A/C
Refrigerant Pressure Sensor and Its Circuit Inspection: ”.
Are refrigerant pressure sensor and/or its circuit in good
condition?
Go to Step 5. Repair circuit and/or
replace refrigerant
pressure sensor.
5 Outside temperature sensor check
1) Check outside temperature sensor referring to “Outside
Air Temperature Sensor Inspection (If Equipped): in
Section 9C”.
Is outside temperature sensor in good condition?
Replace HVAC control
module.
Replace outside
temperature sensor.
Step Action Yes No
5V
G52-10
G30-5
YEL/RED
[A]
21
3
10
I5JB0A720029-01
[A]: HVAC control module connector “G52” (harness side view) 2. BCM
1. HVAC control module 3. Information display
DTC detecting condition Trouble area
Serial communication signal is more than or less than specified value for
specified time continuously.
• Serial communication line of BCM
•BCM
• Information display
• HVAC control module

Suzuki GRAND VITARA Specifications

General

Brand	Suzuki
Model	GRAND VITARA
Category	Automobile
Language	English