Circuit/System Testing

WARNING: This page is about a different car, the 2022 Cadillac CT4. However, it is still accessible from the selected car via links, so may be relevant.

NOTE:

Refer to SIR Service Precautions .
Refer to SIR Disabling and Enabling .

Ignition OFF. Disconnect the harness connector at the B60 Passenger Seat Belt Reminder Occupant Presence Sensor, wait 120 seconds.
Test for less than 30 Ω between the low reference circuit terminal 1 and ground.
- If 30 Ω or greater
1. Ignition OFF.
2. Verify the SIR system is disabled.
3. Disconnect the X2 harness connector at the K36 Restraints Control Module.
4. 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 Restraints Control Module.
- Go to next step: If less than 30 Ω
Ignition ON.
Test for 4.75 - 5.25 V between the signal circuit terminal 2 and ground.
- If less than 4.75 V
1. Verify the SIR system is disabled.
2. Disconnect the X2 harness connector at the K36 Restraints Control Module.
3. Test for infinite resistance between the signal circuit and ground.
  - If less than infinite resistance, repair the short to ground on the circuit.
4. Test for less than 2 Ω in the signal 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 Restraints Control Module.
- If greater than 5.25 V
1. Ignition OFF.
2. Verify the SIR system is disabled.
3. Disconnect the X2 harness connector at the K36 Restraints Control Module. Ignition ON.
4. Test for less than 1 V 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 Restraints Control Module.
- Go to next step: If between 4.75 - 5.25 V
Replace the B60 Passenger Seat Belt Reminder Occupant Presence Sensor.