Passenger Air Bag Disable Switch Circuit/System Testing (C99)

WARNING: This page is about a different car, the 2017 GMC Acadia. However, it is still accessible from the selected car via links, so may be relevant.

Ignition OFF.
Disconnect the harness connector at the S40 passenger air bag disable switch.
Test for less than 30 Ω between the ground circuit terminal 3 and ground.
- If 30 Ω or greater
1. Disconnect the 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.
  - If infinite resistance
3. Test for less than 2 Ω in each control circuit end to end.
  - If 2 Ω or greater, repair the open/high resistance in the circuit.
  - If less than 2 Ω
4. Replace the K36 inflatable restraint sensing and diagnostic module.
- If less than 30 Ω
Ignition ON, test for 4.75-5.25 V between the signal circuit terminal 1 and ground.
- If less than 4.75 V
1. Disconnect the 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.
  - If infinite resistance
3. Test for less than 2 Ω in the low reference 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.
  - If greater than 5.25 V
1. Ignition OFF.
2. Disconnect the harness connector at the K36 inflatable restraint sensing and diagnostic module.
3. Ignition ON, test for less than 1 volt between the signal 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.
- If between 4.75-5.25 V
Replace the S40 passenger air bag disable switch.