Dtc B1504: Sunload Sensor Circuit Malfunction - Suzuki 2006 SX4 Service Manual

Step
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?
4 Evaporator temperature sensor check
1) Check evaporator temperature sensor for performance
referring to "Evaporator Temperature Sensor
Inspection".
Is it in good condition?

DTC B1504: Sunload Sensor Circuit Malfunction

Wiring Diagram
2
[S]
ORN
3
[S]: Sunload sensor signal circuit
[G]: Sunload sensor ground circuit
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.
• Sunload sensor signal voltage is higher than or lower than specified value
for specified time continuously.
• Without sunlight
Action
1
5V
PNK G20-25
ORN G20-24
[G]
1. HVAC control module
2. Sunload sensor
DTC Detecting Condition
Air Conditioning System: Automatic Type 7B-60
Go to Step 4.
Substitute a known-
good HVAC control
module and recheck.
14 13 12 11 10 9 8
30 29 28 27 26 25 24
Yes
Substitute a known-
good HVAC control
module and recheck.
Replace evaporator
temperature sensor.
G20
7 6 5 4 3
23 22 21 20 19 18 17
3. To other sensors
Trouble Area
• Sunload sensor circuit
• Sunload sensor
• HVAC control module
No
S6RW0C7224012
2 1
16 15
I7RW01722006-01