Suzuki 2006 SX4, Service Manual

Page: 925 / 1478

Air Conditioning System: Automatic Type 7B-60
DTC B1504: Sunload Sensor Circuit Malfunction
S6RW0C7224012
Wiring Diagram
DTC Detecting Condition and Trouble Area
NOTE
When DTC B1502, B1503, B1511 and B1512 are indicated together, it is possible that sensor ground
circuit is open.
3 Evaporator temperature sensor reference voltage check
1) Connect connector to HVAC control module with ignition
switch turned OFF.
2) Turn ignition switch to ON position.
3) Measure voltage between signal terminal and ground
terminal of evaporator temperature sensor connector.
Is voltage 4.5 – 5.5 V?
Go to Step 4. Substitute a known-
good HVAC control
module and recheck.
4 Evaporator temperature sensor check
1) Check evaporator temperature sensor for performance
referring to “Evaporator Temperature Sensor
Inspection”.
Is it in good condition?
Substitute a known-
good HVAC control
module and recheck. Replace evaporator
temperature sensor.
Step Action Yes No
G20
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
PNK
ORN ORN
G20-25
G20-24
2
[S]
[G]
1
5V
3
I7RW01722006-01
[S]: Sunload sensor signal circuit 1. HVAC control module 3. To other sensors
[G]: Sunload sensor ground circuit 2. Sunload sensor
DTC Detecting Condition Trouble Area
• Sunload sensor signal voltage is higher than or lower than specified value
for specified time continuously.
• Without sunlight
• Sunload sensor circuit
• Sunload sensor
• HVAC control module