Circuit/System Testing
WARNING: This page is about a different car, the 2012 Buick Verano. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
Each component supplied by the LED backlight dimming control circuits may need to be disconnected to isolate the short to ground. Use the schematics to identify the following:
- Each component control and ground circuit terminals
- Component locations on the LED backlight dimming control circuits
Interior Backlighting Malfunction
- Ignition OFF, scan tool disconnected, all doors closed, all accessories OFF, disconnect the harness connector at the component with inoperative backlighting. It may take up to 2 minutes for all vehicle systems to power down.
- Test for less than 5 Ω between the appropriate ground circuit terminal listed below and ground.
- S30 headlamp switch - terminal 6
- E37F dome/reading lamps - front - terminal 6
- E1D accent lamp - driver door - terminal 2
- E1P accent lamp - passenger door - terminal 2
- E1Q accent lamp - console cupholder left - terminal 2
- E1QS accent lamp - console cupholder right - terminal 2
- S88 sunroof tilt switch - terminal 3
- S72 sunroof switch - terminal 3
- S13D door lock switch - driver- terminal 4
- S13P door lock switch - passenger - terminal 4
- S70R steering wheel controls switch - right - terminal 5
- S70L steering wheel controls switch - left - terminal 7
- S91 park brake control switch - terminal 8
- S48A multifunction switch - instrument panel - terminal 1
- S52 outside rearview mirror switch - terminal 5
- S38 ignition mode switch - terminal 1
- S58B rear compartment lid unlatch switch - interior - terminal 1
- S79P window switch - passenger - terminal 1
- If 5 Ω or greater
- Ignition OFF.
- Test for less than 2 Ω in the ground circuit end to end.
- If 2 Ω or greater, repair the open/high resistance in the circuit.
- If less than 2 Ω, repair the open/high resistance in the ground connection.
- If less than 5 Ω
- Connect a test lamp between the appropriate control circuit terminal listed below and ground.
- S30 headlamp switch - terminal 7
- E37F dome/reading lamps - front - terminal 3
- E1D accent lamp - driver door - terminal 1
- E1P accent lamp - passenger door - terminal 1
- E1Q accent lamp - console cupholder left - terminal 1
- E1QS accent lamp - console cupholder right - terminal 1
- S88 sunroof tilt switch - terminal 2
- S72 sunroof switch - terminal 2
- S13D door lock switch - driver- terminal 1
- S13P door lock switch - passenger - terminal 1
- S70R steering wheel controls switch - right - terminal 4
- S70L steering wheel controls switch - left - terminal 6
- S91 park brake control switch - terminal 6
- S48A multifunction switch - instrument panel - terminal 8
- S52 outside rearview mirror switch - terminal 10
- S38 ignition mode switch - terminal 2
- S58B rear compartment lid unlatch switch - interior - terminal 2
- S79P window switch - passenger - terminal 2
- Verify the test lamp turns ON and OFF when commanding the LED Backlight Dimming ON and OFF with a scan tool.
- If the test lamp is always OFF
- Ignition OFF, disconnect the appropriate harness connector at the K9 body control module.
- Test for infinite resistance between the control circuit and ground.
- If less than infinite resistance, repair the short to ground on the circuit.
- If infinite resistance
- Test for less than 2 Ω in the control circuit end to end.
- If 2 Ω or greater, repair the open/high resistance in the circuit.
- If less than 2 Ω, replace the K9 body control module.
- If the test lamp is always ON
- Ignition OFF, disconnect the appropriate harness connector at the K9 body control module, ignition ON.
- Test for less than 1 V between the control circuit terminal and ground.
- If 1 V or greater, repair the short to voltage on the circuit.
- If less than 1 V, replace the K9 body control module.
- If the test lamp turns ON and OFF
- Test or replace the component with inoperative backlighting.