Auto-On Headlight Sensor On-Vehicle Inspection

WARNING: This page is about a different car, the 2003 Suzuki XL-7 and 2003 Suzuki Grand Vitara. However, it is still accessible from the selected car via links, so may be relevant.

Disconnect negative (-) cable at battery.
Remove auto-on headlight sensor (1) located on the passenger side of the dashboard (2). Be careful not to damage the sensor (1) and dashboard by using rag (3).

Fig 1: Removing Auto-On Headlight Sensor
Courtesy of SUZUKI OF AMERICA CORP.
Measure voltage between white wire terminal and black wire terminal at the following condition. If measured voltage is out of specification, replace sensor.
Auto-on headlight sensor voltage specifications

Cover the sensor lens with hand: 0.4 V

Light the sensor lens with incandescent lamp 100 W: 3 -4.5 V

Fig 2: Measuring Voltage Between White Wire Terminal And Black Wire Terminal
Courtesy of SUZUKI OF AMERICA CORP.