Panel Lamps Dimmer Circuit
WARNING: This page is about a different car, the 2012 RAM Pickup and 2012 RAM Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
As part of the exterior lighting failsafe 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 headlamp switch position if the instrument cluster cannot detect an input from the headlamp 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. | 1. Test and replace the lamp bulb 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 headlamp switch. | 1. Test and replace the headlamp switch if required. |
| 2. Ineffective ElectroMechanical Instrument Cluster (EMIC) inputs or outputs. | 2. Use a diagnostic scan tool to test the EMIC inputs and outputs. Refer to the appropriate diagnostic information. | |
| ALL LAMPS ILLUMINATE AT FULL INTENSITY AT IGNITION ON | 1. Loss of data bus communication. | 1. Use a diagnostic scan tool to test the data bus. Refer to the appropriate diagnostic information. |