DTC B1504-H

Precautions: Precautions for Diagnosing Trouble · General safety (00)

DTC Detecting Condition and Trouble Area

DTC detecting condition	Trouble area
B1504-H: Sunload Sensor and/or Its Circuit Malfunction Signal voltage of position sensor in sunload sensor is higher than specified value (4.9 V) for specified time continuously.	•Sunload sensor circuit •Sunload sensor •HVAC control module

Circuit Diagram

[A]:	HVAC control module connector (View: [a])	A2.	Ground for sensors circuit	2.	HVAC control module
A1.	Sunload sensor signal circuit	1.	Sunload sensor

DTC Confirmation Procedure

1)Start engine and operate A/C system.

DTC Troubleshooting

NOTE:

•When DTC B1502-H is indicated together, it is possible that sensor ground circuit is open.
•DTC B1504 is detected even though there is not any malfunction if sunload sensor is not lit by an incandescent light. Light the sunload sensor with a light.

Step	Action	Yes	No
1	Scan tool parameter check 1)Apply light to sunload sensor vertically, holding incandescent light of approximately 100 W about 100 mm (3.94 in.) away from sunload sensor. 2)Check “Sun Load” using “Data list” mode on SUZUKI scan tool. Is sun load value 0 W/m²?	Go to Step 2.	Intermittent trouble.
2	Sunload sensor signal circuit check 1)Disconnect sunload sensor connector. 2)Connect the “A1” and “A2” circuit terminals of sunload sensor connector using service wire. 3)Check “Sun Load” using “Data list” mode on SUZUKI scan tool. Is sun load value 0 W/m²?	Go to Step 3.	Replace sunload sensor.
3	Sunload sensor signal circuit check 1)Connect the “A1” and “A2” circuit terminals of “G20” connector using service wire. 2)Check “Sun Load” using “Data list” mode on SUZUKI scan tool. Is sun load value 0 W/m²?	Replace HVAC control module and recheck DTC.	Replace instrument panel harness.