Circuit/System Testing

WARNING: This page is about a different car, the 2015 Cadillac SRX. However, it is still accessible from the selected car via links, so may be relevant.

Ignition OFF. Disconnect the harness connector at the appropriate B59 Front Impact Sensor. It may take up to 2 min for all vehicle systems to power down.
Test for less than 10 Ω between the low reference circuit terminal 2 and ground.
- If 10 Ω or greater
1. Disconnect the X2 harness connector at the K36 Inflatable Restraint Sensing and Diagnostic Module.
2. 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 less than 10 Ω
Test for greater than 50k Ω between the signal circuit terminal 1 and ground.
- If 50k Ω or less
1. Disconnect the harness connector at the K36 Inflatable Restraint Sensing and Diagnostic Module.
2. Test for infinite resistance between the signal circuit and ground.
  - If less than infinite resistance, repair the short to ground on the circuit.
  - If infinite resistance, replace the K36 Inflatable Restraint Sensing and Diagnostic Module.
- If greater than 50k Ω
Ignition ON, wait 1 min, test for less than 1 V between the signal circuit terminal 1 and ground.
- If 1 V or greater
1. Ignition OFF, disconnect the harness connector at the K36 Inflatable Restraint Sensing and Diagnostic Module, ignition ON.
2. Test for less than 1 V between the signal circuit and ground.
  - If greater than 1 V, repair the short to voltage on the circuit.
  - If less than 1 V, replace the K36 Inflatable Restraint Sensing and Diagnostic Module.
- If less than 1 V

NOTE:

When using the MIN MAX function, autorange on the DMM may not function properly. To ensure accurate test results, turn off autorange and manually set the DMM range to 000.0 V.

Ignition OFF, install a DMM between the signal circuit terminal 1 and ground. Set the DMM to capture DC voltage using the MIN MAX function. Turn off autorange and manually set the DMM range to 000.0 V. Ignition ON.
Verify the MAX voltage captured by the DMM is between 4-9V.
- If less than 4 V
1. Disconnect the X2 harness connector at the K36 Inflatable Restraint Sensing and Diagnostic Module.
2. Test for infinite resistance between the signal 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 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 Inflatable Restraint Sensing and Diagnostic Module.
- If greater than 9V
1. Ignition OFF. Disconnect the X2 harness connector at the K36 Inflatable Restraint Sensing and Diagnostic Module. Ignition ON.
2. Test for less than 1 V between the signal circuit terminal 1 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 4-9V
Ignition OFF, connect all harness connectors, press in the CPA (if equipped) until an audible and/or tactile click is heard.
Ignition ON, clear DTCs. Operate the vehicle within the Conditions for Running the DTC.
Verify DTC B0083 or B0084 does not set.
- If the DTC sets
1. Replace the B59 Front Impact Sensor.
2. Verify the DTC does not set.
  - If the DTC sets, replace the K36 Inflatable Restraint Sensing and Diagnostic Module.
  - If the DTC does not set.
3. All OK.
- If the DTC does not set
All OK.