Circuit/System Testing

WARNING: This page is about a different car, the 2019 Buick Cascada, 2018 Buick Cascada, and 2017 Buick Cascada. However, it is still accessible from the selected car via links, so may be relevant.

NOTE:

When removing connectors inspect for damage or corrosion. Damage or corrosion in the following requires repair or replacement of the affected.

Multifunction Switch 1 - Instrument Panel.
Multifunction Switch 1 - Instrument Panel on/off indicator wiring harness.

Ignition OFF, disconnect the harness connector at the S48C Multifunction Switch 1 - Instrument Panel. It may take up to 2 minutes for all vehicle systems to power down.
Test for less than 10 Ω between the ground circuit terminal 1 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.
- Go to next step: If less than 10 Ω
Ignition ON, command the passenger air bag OFF indicator OFF with a scan tool.
Test for less than 11 V between the control circuit terminal 2 and ground.
- If 11 V or greater
1. Ignition OFF, disconnect the X1 harness connector at the K36 Inflatable Restraint Sensing and Diagnostic Module, ignition ON.
2. Test for less than 1 V between the control circuit and ground.
  - If 1 V or greater, repair the short to voltage on the circuit.
  - If less than 1 V, replace the K36 Inflatable Restraint Sensing and Diagnostic Module.
- Go to next step: If less than 11 V
Command the passenger air bag OFF indicator ON with a scan tool.
Test for 1 V or greater between the control circuit terminal 2 and ground.
- If less than 1 V
1. Disconnect the X1 harness connector at the K36 Inflatable Restraint Sensing and Diagnostic 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.
  - Go to next step: 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 K36 Inflatable Restraint Sensing and Diagnostic Module.
- Go to next step: If 1 V or greater
Command the passenger air bag ON indicator OFF with a scan tool.
Test for less than 11 V between the control circuit terminal 3 and ground.
- If 11 V or greater
1. Ignition OFF, disconnect the X1 harness connector at the K36 Inflatable Restraint Sensing and Diagnostic Module, ignition ON.
2. Test for less than 1 V between the control circuit and ground.
  - If 1 V or greater, repair the short to voltage on the circuit.
  - If less than 1 V, replace the K36 Inflatable Restraint Sensing and Diagnostic Module.
- Go to next step: If less than 11 V
Command the passenger air bag ON indicator ON with a scan tool.
Test for 1 V or greater between the control circuit terminal 3 and ground.
- If less than 1 V
1. Disconnect the X1 harness connector at the K36 Inflatable Restraint Sensing and Diagnostic 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.
  - Go to next step: 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 K36 Inflatable Restraint Sensing and Diagnostic Module.
- Go to next step: If 1 V or greater
Test or replace the S48C Multifunction Switch 1 - Instrument Panel.