Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Circuit/System Description
Voltage for the interior backlighting components is supplied from the CHMSL/DIMR Fuse in the instrument panel I/P electrical center to the body control module (BCM).
The BCM applies a voltage reference through the instrument panel (I/P) dimming voltage reference circuit to the interior lamp dimming switch, which is part of the headlamp switch. When the dimming switch is placed in the desired position, the dimmed voltage setting is applied from the interior lamp dimming switch through the I/P dimming return circuit to the BCM. The BCM then applies the dimmed voltage to the I/P lamps supply voltage circuit and they dim to the correct level.
The IP lamps are located in the following components:
- Cigar lighter
- Driver Information Center DIC switch
- Door lock switches
- Fog Lamp switch
- Headlamp switch (turn signal multifunction switch)
- Hazard switch
- HVAC Control
- Rear HVAC Control if equipped
- I/P cluster
- Power window switch
- Power mirror switches
- PRNDL
- Radio
- Rear Seat Audio if equipped
- Steering Wheel Controls
- Sunroof switch
- Sunshade switch
- TCS switch
- Universal garage door opener switch
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.