Suzuki 2006 SX4, Service Manual

Page: 935 / 1478

Air Conditioning System: Automatic Type 7B-70
DTC B1546: A/C Refrigerant Pressure Malfunction
S6RW0C7224019
DTC Detecting Condition and Trouble Area
DTC Troubleshooting
DTC B1551: Serial Communication Circuit Malfunction
S6RW0C7224020
Wiring Diagram
DTC detecting condition Trouble area
• A/C refrigerant pressure sensor signal voltage is lower than specified value
even though outside air temperature is higher than specified value for
specified time continuously.
• Insufficient refrigerant in A/C system
• Insufficient of refrigerant
• A/C refrigerant pressure sensor
• Outside air temperature sensor
• 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) Turn ignition switch to ON position and check DTC in
BCM.
Is DTC B1141 or B1142 (BCM) detected?
Go to applicable DTC
diag. flow. Go to Step 3.
3 DTC check
Check DTC in ECM.
Is DTC P0532 or P0533 detected?
Go to applicable DTC
diag. flow. Go to Step 4.
4 A/C refrigerant pressure and outside air temperature
data check
1) Start engine and select “DATA LIST” mode on scan tool.
2) Check “Refrigerant Pressure” 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”?
Substitute a known-
good HVAC control
module and recheck. Check the amount of
refrigerant and system
for leaks.
12V
G20
G20-13 YEL
1 2 3 4 5 6 7 8 9 10 11 12 13 14
15 16 17 18 19 20 21 24 23 22 25 26 27 28 29 30
1
2
3
[S]
WHT/RED
WHT
G20-7
12V
5V
[B]
4
4
I7RW01722012-02
[B]: Back-up power supply circuit 1. HVAC control module 3. Information display
[S]: Serial communication circuit 2. BCM 4. Circuit fuse