Circuit/System Testing

WARNING: This page is about a different car, the 2020 Buick Regal TourX, 2020 Buick Regal, 2019 Buick Regal TourX, and 2019 Buick Regal. However, it is still accessible from the selected car via links, so may be relevant.

Ignition/Vehicle & All vehicle systems - Off
Disconnect the appropriate electrical connector: F107 Steering Wheel Air Bag
Test for greater than 25 ohms between the test points: Control circuit terminal 1 & Control circuit terminal 2
- If 25 ohms or less
1. Disconnect the electrical connector: K36 Inflatable Restraint Sensing and Diagnostic Module
2. Test for infinite resistance between the test points: Control circuit terminal 1 & Control circuit terminal 2 @ Component harness
  - If less than infinite resistance - Repair the short between the circuits.
  - If infinite resistance - Replace the component: K36 Inflatable Restraint Sensing and Diagnostic Module
- Go to next step: If greater than 25 ohms
Ignition - On/Vehicle - In Service Mode
Test for less than 11 V between the test points:
- Control circuit terminal 1 & Ground
- Control circuit terminal 2 & Ground
- If 11 V or greater
1. Ignition/Vehicle & All vehicle systems - Off
2. Disconnect the electrical connector: K36 Inflatable Restraint Sensing and Diagnostic Module
3. Ignition - On/Vehicle - In Service Mode
4. Test for less than 1 V between the test points:
  - Control circuit terminal 1 @ Component harness & Ground
  - Control circuit terminal 2 @ Component harness & Ground
  - If 1 V or greater - Repair the short to voltage on the circuit.
  - If less than 1 V - Replace the component: K36 Inflatable Restraint Sensing and Diagnostic Module
- Go to next step: If less than 11 V
Ignition/Vehicle & All vehicle systems - Off
Test for greater than 25 ohms between the test points:
- Control circuit terminal 1 & Ground
- Control circuit terminal 2 & Ground
- If 25 ohms or less
1. Disconnect the electrical connector: K36 Inflatable Restraint Sensing and Diagnostic Module
2. Test for infinite resistance between the test points:
  - Control circuit terminal 1 @ Component harness & Ground
  - Control circuit terminal 2 @ Component harness & Ground
  - If less than infinite resistance - Repair the short to ground on the circuit.
  - If infinite resistance - Replace the component: K36 Inflatable Restraint Sensing and Diagnostic Module
- Go to next step: If greater than 25 ohms
Ignition/Vehicle & All vehicle systems - Off
Connect a 3 A fused jumper wire between the test points: Control circuit terminal 1 & Control circuit terminal 2
Ignition - On/Vehicle - In Service Mode
Verify the appropriate scan tool parameter: Deployment Loop 1 - 20 Resistance = Less than 2 ohms
- If 2 ohms or greater
1. Ignition/Vehicle & All vehicle systems - Off
2. Disconnect the electrical connector:
  - X85 Steering Wheel Air Bag Coil
  - K36 Inflatable Restraint Sensing and Diagnostic Module
3. Test for less than 2 ohms between the test points:
  - Control circuit terminal 1 @ X85 Steering Wheel Air Bag Coil & The other end of the circuit
  - Control circuit terminal 2 @ X85 Steering Wheel Air Bag Coil & The other end of the circuit
  - If 2 ohms or greater - Repair the open/high resistance in the circuit.
  - If less than 2 ohms - Replace the component: K36 Inflatable Restraint Sensing and Diagnostic Module
- Go to next step: If less than 2 ohms
Ignition/Vehicle & All vehicle systems - Off
Connect the electrical connector: F107 Steering Wheel Air Bag
Ignition - On/Vehicle - In Service Mode
Clear the DTCs.
Operate the vehicle within the Conditions for Running the DTC.
Verify the DTC does not set.
- If the DTC sets
  Replace the component: F107 Steering Wheel Air Bag
- Go to next step: If the DTC is not set
All OK.