Component Test
WARNING: This page is about a different car, the 2019 GMC Savana 3500, 2019 GMC Savana 2500, 2019 Chevrolet Express 3500, and 2019 Chevrolet Express 2500. However, it is still accessible from the selected car via links, so may be relevant.
IMPORTANT:
If the switch tests open in any switch position other than Auto, test the switch signal circuits for a short to voltage before replacing the switch.
Headlamp Switch
- Ignition OFF, disconnect the harness connector at the headlamp switch.
- Test for infinite resistance between the signal terminal 3 and the ground terminal 8 with the switch in the Auto position.
- If not the specified value, replace the headlamp switch.
- Test for infinite resistance between the signal terminal 1 and the ground terminal 8 with the switch in the Auto position.
- If not the specified value, replace the headlamp switch.
- Test for less than 2.0 ohms between the signal terminal 3 and the ground terminal 8 with the switch in the Off position.
- If not the specified value, replace the headlamp switch.
- Test for less than 2.0 ohms between the signal terminal 1 and the ground terminal 8 with the switch in the Headlamp position.
- If not the specified value, replace the headlamp switch.