For 1990-2009 cars

Step | Action | Value(s) | Yes | No
--- | --- | --- | --- | ---
Important: A short to ground will cause an open fuse(s). Before performing this diagnostic procedure, inspect the fuse(s) for an open.
1 |

1. Turn the headlamp switch to the PARK position.
2. Use a DMM in order to backprobe the panel dimmer switch and measure the voltage between terminal B and ground.
3. Adjust the panel dimmer switch between full dim and full intensity.

Is the voltage equal to the specified value?

4 V, B +

Go to Step 2

Go to Step 3

2 |

1. Disconnect the lamp dimmer module connector.
2. Use a DMM in order to measure the resistance between terminal B of the panel dimmer switch and terminal B of the lamp dimmer module connector.

Is the value within the specified range?

0-2ohms

Go to Step 4

Go to Step 5

3 | Replace the panel dimmer switch. Refer to Instrument Panel Lamp Dimmer Switch Replacement in Instrument Panel, Gauges and Console. Is the repair complete? | -- | Go to Interior Lights Dimming System Check | --
4 | Replace the lamp dimmer module. Refer to Instrument Panel Lamp Dimmer Replacement in Instrument Panel, Gauges and Console. Is the repair complete? | -- | Go to Interior Lights Dimming System Check | --
5 | Repair the open in CKT 44 between the panel dimmer switch and the lamp dimmer module. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Interior Lights Dimming System Check | --