Dimmer Switch Circuit Test
WARNING: This page is about a different car, the 2011 Chevrolet Volt. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition OFF, disconnect the harness connector at the S16 Driver Information Center Switch.
- Test for less than 5 Ω between the ground circuit harness connector terminal 4 and ground.
- If greater than the specified value, test the ground circuit for an open/high resistance.
- Ignition ON, connect a test lamp between the 12 V reference circuit terminal 11 and ground.
- If the test lamp is always OFF, test the 12 V reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K9 BCM.
- Ignition ON, test for less than 0.3 V between dimming signal circuit terminal 10 and ground.
- If greater than the specified range, test the dimming signal circuit for a short to voltage. If the circuit tests normal, replace the K9 BCM.
- Ignition OFF, reconnect the harness connector to the S16 Driver Information Center Switch.
- Ignition ON, put the S78 Turn Signal/Multifunction Switch in the park lamps position and set the interior to maximum dim.
- Disconnect the harness connector at the S16 Driver Information Center Switch.
- Install a 3 A fused jumper wire between the signal circuit terminal 10 and the 12 V reference circuit terminal 11. The interior backlighting should now be dimmed.
- If the interior backlighting is not dimmed, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K9 BCM.
- If all circuits test normal, test or replace the S16 Driver Information Center Switch.