Circuit/System Verification

WARNING: This page is about a different car, the 2015 GMC Terrain and 2015 Chevrolet Equinox. However, it is still accessible from the selected car via links, so may be relevant.

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.
- If the parameter changes
Verify all backlighting components turn ON and OFF while commanding the LED Backlight Dimming ON and OFF with a scan tool.
- If all backlighting components do not turn ON and OFF
  Refer to Interior Backlighting Malfunction.
- If all backlighting components 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.
- If the transmission shift lever position indicator backlighting turns 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.
- If the phrase PASSENGER AIR BAG is illuminated
All OK.