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 Verification
- Ignition ON.
- Verify the scan tool LED Backlight Dimming Command parameter changes between a high percentage to a low percentage while operating the dimmer switch from high to low.
- If the parameter does not change
Refer to Dimmer Switch Malfunction below.
- Go to next step: If the parameter changes
- If the parameter does not change
- Verify the backlighting components turn ON and OFF while commanding the LED Backlight Dimming ON and OFF with a scan tool.
- If the backlighting components do not turn ON and OFF
Refer to Interior Backlighting Malfunction below.
- Go to next step: If the backlighting components turn ON and OFF
- If the backlighting components do not turn ON and OFF
- Verify the switch indicator amber LED's for all of the components listed below turn ON and OFF while turning the associated switches ON and OFF.
- K33 HVAC Control Module - Left Rear
- P43 Collision Alert Indicator
- S48E Multifunction Switch - Center Console
- S70L Steering Wheel Controls Switch - Left
- If any of the switch indicator amber LED's do not turn ON and OFF
Refer to Switch Indicator LED Backlighting Malfunction below.
- Go to next step: If the switch indicator amber LED's turn ON and OFF
- Verify the transmission shift lever position indicator backlighting turns ON and OFF while turning the park lamps ON and OFF with the headlamp switch.
- If the transmission shift lever position indicator backlighting does not turn ON and OFF
Refer to Transmission Shift Lever Position Indicator Backlighting Malfunction below.
- Go to next step: If the transmission shift lever position indicator backlighting turns ON and OFF
- If the transmission shift lever position indicator backlighting does not turn ON and OFF
- Verify the phrase PASSENGER AIR BAG is illuminated on the Passenger Air Bag Disable Indicator.
- If the phrase PASSENGER AIR BAG is not illuminated
Refer to Passenger Air Bag Disable Indicator Backlighting Malfunction below.
- Go to next step: If the phrase PASSENGER AIR BAG is illuminated
- If the phrase PASSENGER AIR BAG is not illuminated
- All OK.
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.