Circuit/System Testing

WARNING: This page is about a different car, the 2017 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, disconnect the harness connectors at the components listed below.
- K33 HVAC Control Module
- S48A Multifunction Switch - Instrument Panel
Test for less than 10 Ω between the ground circuit terminal 8 at the K33 HVAC Control Module and ground.
- If 10 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 10 Ω
Ignition ON, place the instrument panel dimmer switch in the HIGH position for high backlighting intensity.
Verify a test lamp illuminates between the appropriate control circuit terminal listed below and ground.
- K33 HVAC Control Module terminal 4
- S48A Multifunction Switch - Instrument Panel terminal 5
- If the test lamp does not illuminate
1. Ignition OFF, disconnect the X1 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 illuminates
Place the instrument panel dimmer switch in the LOW position for low backlighting intensity.
Verify a test lamp does not illuminate at FULL intensity between the appropriate control circuit terminal listed below and ground.
- K33 HVAC Control Module terminal 4
- S48A Multifunction Switch - Instrument Panel terminal 5
- If the test lamp illuminates at full intensity
1. Ignition OFF, disconnect the X1 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 does not illuminate at full intensity
Test or replace the inoperative component.