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 B19BB = B306A Parking Assist Alarm Sensor - Front Left Outer
- DTC B19BC = B306B Parking Assist Alarm Sensor - Front Left Middle
- DTC B19BD = B306D Parking Assist Alarm Sensor - Front Right Outer
- DTC B19BE = B306C Parking Assist Alarm Sensor - Front Right Middle
Verify a test lamp illuminates between low reference circuit terminal 3 and B+
- If the test lamp does not illuminate
1. Test circuit 5214 for an open/high resistance.
  - If an open/high resistance is found, repair the fault on circuit 5214.
  - 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 6581 for a short to ground.
  - If a short to ground is found, repair the fault on circuit 6581.
  - Go to next step: If a short to ground is not found
2. Test circuit 6581 for an open/high resistance
  - If an open/high resistance is found, repair the fault on circuit 6581.
  - 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 B19BB = Circuit 5215
  - DTC B19BC = Circuit 5216
  - DTC B19BD = Circuit 5217
  - DTC B19BE = Circuit 5218
  - 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 B19BB = Circuit 5215
  - DTC B19BC = Circuit 5216
  - DTC B19BD = Circuit 5217
  - DTC B19BE = Circuit 5218
  - 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 B19BB = Circuit 5215
  - DTC B19BC = Circuit 5216
  - DTC B19BD = Circuit 5217
  - DTC B19BE = Circuit 5218
  - 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.