Panel Lamps Dimmer Circuit
WARNING: This page is about a different car, the 2013 RAM 3500 HD and 2013 RAM 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
As part of the exterior lighting fail-safe feature, upon ignition ON all of the panel lamps dimmer circuit lamps will illuminate at full intensity and the exterior park lamps and headlamp low beams will illuminate regardless of the left multi-function switch control knob and sleeve positions if the Steering Control Module (SCM) cannot detect an input from the left multi-function switch, or if there is a loss of data bus communication.
| CONDITION | POSSIBLE CAUSES | CORRECTION |
|---|---|---|
| A SINGLE LAMP DOES NOT ILLUMINATE | 1. Ineffective or missing bulb or Light Emitting Diode (LED) unit. | 1. Test and replace the lamp bulb or LED unit if required. |
| 2. Ineffective ground circuit. | 2. Test and repair the open lamp ground circuit if required. | |
| 3. Ineffective feed circuit. | 3. Test and repair the open lamp feed circuit if required. | |
| A SINGLE LAMP DOES NOT EXTINGUISH | 1. Ineffective feed circuit. | 1. Test and repair the shorted lamp feed circuit if required. |
| ALL LAMPS DO NOT ILLUMINATE | 1. Ineffective ground circuit. | 1. Test and repair the open lamp ground circuit if required. |
| 2. Ineffective feed circuit. | 2. Test and repair the open lamp feed circuit if required. | |
| 3. Ineffective BCM inputs or outputs. | 3. Use a diagnostic scan tool and the appropriate diagnostic information for further BCM diagnosis. | |
| ALL LAMPS ILLUMINATE AT FULL INTENSITY AT IGNITION ON | 1. Ineffective dimmer module. | 1. Test and replace the dimmer module if required. |
| 2. Ineffective BCM inputs or outputs. | 2. Use a diagnostic scan tool and the appropriate diagnostic information for further BCM diagnosis. | |
| 3. Loss of data bus communication. | 3. Use a diagnostic scan tool to test the data bus. Refer to the appropriate diagnostic information. |