Auto-On Headlights System On-Vehicle Inspection

Turn ignition switch to ON position and release parking brake and turn lighting switch to OFF position.
Cover the sensor lens of auto-on headlight controller (1) with a hand and check headlights come ON after 5 seconds. If headlights do not come ON, go to Step 4 ).

Fig 1: Covering Sensor Lens Of Auto-On Headlight Controller
Courtesy of SUZUKI OF AMERICA CORP.
Light the sensor lens of auto-on headlight controller (1) with a light (2) and check headlights go out after 20 seconds. If headlights do not go out, go to Step 4).
If check result is of Step 1 ) to 3) is OK, this system is OK.

Fig 2: Lighting Sensor Lens Of Auto-On Headlight Controller With Light
Courtesy of SUZUKI OF AMERICA CORP.
Disconnect auto-on headlights controller coupler (1) with ignition switch OFF.
Check the voltage between terminals are as follows.
If check result is not satisfactory, repair and recheck.

Auto-on headlight system circuit specification

Terminal G34-6 and G34-1 (ignition switch OFF): 0 V

Terminal G34-6 and G34-1 (ignition switch ON): 10 - 14 V

Terminal G34-6 and G34-4: 10 - 14 V

Terminal G34-6 and G34-5: 10 - 14 V

Fig 3: Checking Headlight Voltage
Courtesy of SUZUKI OF AMERICA CORP.
If check result of step 5 ) is OK, replace controller and recheck.