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.

Ignition OFF, disconnect the connector at the appropriate B306 Parking Assist Alarm Sensor:
- DTC B132B = B306E Parking Assist Alarm Sensor - Rear Left Outer
- DTC B132C = B306F Parking Assist Alarm Sensor - Rear Left Middle
- DTC B132D = B306G Parking Assist Alarm Sensor - Rear Right Middle
- DTC B132E = B306H Parking Assist Alarm Sensor - Rear Right Outer
Verify a test lamp illuminates between low reference circuit terminal 3 and B+
- If the test lamp does not illuminate
1. Test circuit 2379 for an open/high resistance.
  - If an open/high resistance is found, repair the fault on the circuit.
  - Go to next step: If an open/high resistance is not found
2. Replace the K182 Parking Assist Control Module
- Go to next step: If the test lamp illuminates
Ignition ON.
Verify a test lamp illuminates between voltage reference circuit terminal 1 and ground.
- If a test lamp does not illuminate
1. Test circuit 2374 for a short to ground.
  - If a short to ground is found, repair the fault on the circuit.
  - Go to next step: If a short to ground is not found
2. Test circuit 2374 for an open/high resistance
  - If an open/high resistance is found, repair the fault on the circuit.
  - Go to next step: If an open/high resistance is not found
3. Replace the K182 Parking Assist Control Module
- Go to next step: If a test lamp illuminates
Test for 3.5 - 12.0 V between signal circuit terminal 2 and ground.
- If less than 3.5 V
1. Test the appropriate circuit for a short to ground:
  - DTC B132B = Circuit 2375
  - DTC B132C = Circuit 2376
  - DTC B132D = Circuit 2377
  - DTC B132E = Circuit 2378
  - If a short to ground is found, repair the fault on the circuit.
  - Go to next step: If a short to ground is not found
2. Test the appropriate circuit for an open/high resistance:
  - DTC B132B = Circuit 2375
  - DTC B132C = Circuit 2376
  - DTC B132D = Circuit 2377
  - DTC B132E = Circuit 2378
  - If an open/high resistance is found, repair the fault on the circuit.
  - Go to next step: If an open/high resistance is not found
3. Replace the K182 Parking Assist Control Module
- If greater than 12.0 V
1. Test the appropriate circuit for a short to voltage:
  - DTC B132B = Circuit 2375
  - DTC B132C = Circuit 2376
  - DTC B132D = Circuit 2377
  - DTC B132E = Circuit 2378
  - If a short to voltage is found, repair the fault on the circuit.
  - Go to next step: If a short to voltage is not found
2. Replace the K182 Parking Assist Control Module
- Go to next step: If between 3.5 - 12.0 V
Replace the appropriate B306 Parking Assist Alarm Sensor.