Circuit/System Verification

WARNING: This page is about a different car, the 2018 Chevrolet Sonic. 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 below.
- Go to next step: If the parameter changes
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
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
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
All OK.