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 and all vehicle systems OFF. Disconnect the connector at the appropriate B161 Vertical Suspension Acceleration Sensor:
- DTC C102E = B161LF Vertical Suspension Acceleration Sensor - Left Front
- DTC C1030 = B161LR Vertical Suspension Acceleration Sensor - Left Rear
- DTC C1031 = B161RF Vertical Suspension Acceleration Sensor - Right Front
- DTC C1032 = B161RR Vertical Suspension Acceleration Sensor - Right Rear
Test for less than 10 Ω between the low reference circuit terminal 2 and ground.
- If 10 Ω or greater
1. Test the appropriate circuit for an open/high resistance:
  - DTC C102E = Circuit 1099
  - DTC C1030 = Circuit 1833
  - DTC C1031 = Circuit 1105
  - DTC C1032 = Circuit 1108
  - If an open/high resistance is found, repair the circuit fault.
  - Go to next step: If an open/high resistance is not found
2. Replace the K19 Suspension Control Module.
- Go to next step: If less than 10 Ω
Ignition ON.
Test for 4.8 - 5.2 V between the 5 V reference circuit terminal 1 and ground.
- If less than 4.8 V
1. Test the appropriate circuit for a short to ground:
  - DTC C102E = Circuit 1817
  - DTC C1030 = Circuit 1818
  - DTC C1031 = Circuit 1819
  - DTC C1032 = Circuit 1820
  - If a short to ground is found, repair the circuit fault.
  - Go to next step: If a short to ground is not found
2. Test the appropriate circuit for an open/high resistance:
  - DTC C102E = Circuit 1817
  - DTC C1030 = Circuit 1818
  - DTC C1031 = Circuit 1819
  - DTC C1032 = Circuit 1820
  - If an open/high resistance is found, repair the circuit fault.
  - Go to next step: If an open/high resistance is not found
3. Replace the K19 Suspension Control Module.
- If greater than 5.2 V
1. Ignition OFF, disconnect the connector at the K19 Suspension Control Module, ignition ON.
2. Test the appropriate circuit for a short to voltage:
  - DTC C102E = Circuit 1817
  - DTC C1030 = Circuit 1818
  - DTC C1031 = Circuit 1819
  - DTC C1032 = Circuit 1820
  - If a short to voltage is found, repair the circuit fault.
  - Go to next step: If a short to voltage is not found
3. Replace the K19 Suspension Control Module.
- Go to next step: If between 4.8 - 5.2 V
Verify the appropriate scan tool Vertical Wheel Acceleration parameter is less than 1 V.
- If 1 V or greater
1. Test the appropriate circuit for a short to voltage:
  - DTC C102E = Circuit 1100
  - DTC C1030 = Circuit 1103
  - DTC C1031 = Circuit 1106
  - DTC C1032 = Circuit 1109
  - If a short to voltage is found, repair the circuit fault.
  - Go to next step: If a short to voltage is not found
2. Replace the K19 Suspension Control Module.
- Go to next step: If less than 1 V
Install a 3 A fused jumper wire between the 5-volt reference circuit terminal 1 and the signal circuit terminal 3, engine RUNNING.
Verify the appropriate scan tool Vertical Wheel Acceleration parameter is greater than 4.8 V.
- If less than 4.8 V
1. Test the appropriate circuit for a short to ground:
  - DTC C102E = Circuit 1100
  - DTC C1030 = Circuit 1103
  - DTC C1031 = Circuit 1106
  - DTC C1032 = Circuit 1109
  - If a short to ground is found, repair the circuit fault.
  - Go to next step: If a short to ground is not found
2. Test the appropriate circuit for an open/high resistance:
  - DTC C102E = Circuit 1100
  - DTC C1030 = Circuit 1103
  - DTC C1031 = Circuit 1106
  - DTC C1032 = Circuit 1109
  - If an open/high resistance is found, repair the circuit fault.
  - Go to next step: If an open/high resistance is not found
3. Replace the K19 Suspension Control Module.
- Go to next step: If 4.8 V or greater
Test or replace the appropriate B161 Vertical Suspension Acceleration Sensor.