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:

It may take up to 2 min for all vehicle systems to power down before an accurate ground or low reference circuit continuity test can be performed.

Ignition/Vehicle & All vehicle systems - Off
Disconnect the electrical connector: B172LF Front Disc Brake Pad Wear Sensor - Left
Test for less than 10 ohms between the test points: Ground circuit terminal 2 & Ground
- If 10 ohms or greater
1. Test for less than 2 ohms between the test points: Ground circuit terminal 2 @ Component harness & The other end of the circuit
  - If 2 ohms or greater - Repair the open/high resistance in the circuit.
  - If less than 2 ohms - Repair the open/high resistance in the ground connection.
- Go to next step: If less than 10 ohms
Ignition - On / Vehicle - In Service Mode
Verify the scan tool parameter: Front Brake Pad Wear Sensors = Greater than 10.5 V
- If not the specified state
1. Ignition/Vehicle - Off
2. Disconnect the electrical connector: K160 Brake System Control Module
3. Test for infinite resistance between the test points: Signal circuit terminal 1 @ Component harness & Ground
  - If less than infinite resistance - Repair the short to ground on the circuit.
  - If infinite resistance - Replace the component: K160 Brake System Control Module
- Go to next step: If the specified state
Connect a 3 A fused jumper wire between the test points: Signal circuit terminal 1 & Ground circuit terminal 2
Verify the scan tool parameter: Front Brake Pad Wear Sensors = 0 V
- If not the specified state
1. Ignition/Vehicle - Off & Remove - Jumper wire (s)
2. Disconnect the electrical connector: K160 Brake System Control Module
3. Ignition - On / Vehicle - In Service Mode
4. Test for less than 1 V between the test points: Signal circuit terminal 1 @ Component harness & Ground
  - If 1 V or greater - Repair the short to voltage on the circuit.
  - Go to next step: If less than 1 V
5. Ignition/Vehicle - Off
6. Test for less than 2 ohms between the test points: Signal circuit terminal 1 @ Component harness & The other end of the circuit @ Control module harness
  - If 2 ohms or greater - Repair the open/high resistance in the circuit.
  - If less than 2 ohms - Replace the component: K160 Brake System Control Module
- Go to next step: If the specified state
Test or replace the component: B172LF Front Disc Brake Pad Wear Sensor - Left