Circuit/System Testing

WARNING: This page is about a different car, the 2013 Chevrolet Spark. However, it is still accessible from the selected car via links, so may be relevant.

NOTE:

Each component with backlighting may need to be disconnected to isolate a short to voltage or short to ground. Use the schematics to identify the following:

Backlighting components the vehicle is equipped with
Each component's control and ground circuit terminals
Component locations on the backlighting control circuit

Ignition OFF, 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 15 Ω between the appropriate ground circuit terminal listed below and ground.
- S13D Door Lock Switch - Driver terminal 3
- S13P Door Lock Switch - Passenger terminal 3
- S36 Instrument Panel Dimmer Switch - terminal 5
- S46B Liftgate Unlatch Switch - terminal 6
- S32D Seat Heating Switch - Driver terminal 5
- S32P Seat Heating Switch - Passenger terminal 5
- S70L Steering Wheel Controls Switch - Left terminal 7
- S70R Steering Wheel Controls Switch - Right terminal 5
- S75 Traction Control Switch - terminal 3
- S3 Transmission Shift Lever - terminal 3
- If 15 Ω or greater
1. Ignition OFF.
2. 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 15 Ω
Connect a test lamp between the appropriate control circuit terminal listed below and ground.
- K33 HVAC control module - terminal 6 X1
- S13D Door Lock Switch - Driver terminal 1
- S13P Door Lock Switch - Passenger terminal 1
- S36 Instrument Panel Dimmer Switch - terminal 4
- S46B Liftgate Unlatch Switch - terminal 5
- S32D Seat Heating Switch - Driver terminal 6
- S32P Seat Heating Switch - Passenger terminal 6
- S70L Steering Wheel Controls Switch - Left terminal 6
- S70R Steering Wheel Controls Switch - Right terminal 4
- S75 Traction Control Switch - terminal 2
- S3 Transmission Shift Lever - terminal 8
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
1. Ignition OFF, disconnect the X2 harness connector at the K9 Body Control Module.
2. 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
3. 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
1. Ignition OFF, disconnect the X2 harness connector at the K9 Body Control Module, ignition ON.
2. 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.