Circuit/System Testing

WARNING: This page is about a different car, the 2019 Buick Cascada, 2018 Buick Cascada, and 2017 Buick Cascada. 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: S48A Multifunction Switch - Instrument Panel
Test for less than 10 ohms between the test points: Ground circuit terminal 1 & Ground
- If 10 ohms or greater
1. Ground Connection - Disconnect
2. Test for less than 2 ohms between the test points: Ground circuit terminal 1@Component harness & Ground Connection
  - 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: Central Door Lock Switch on Center Console = Inactive
- If not the specified state
1. Ignition/Vehicle - Off
2. Disconnect the electrical connector: X2@K9 Body Control Module
3. Test for infinite resistance between the test points:
  - Signal circuit terminal 9@Component harness & Ground
  - Signal circuit terminal 11@Component harness & Ground
  - If less than infinite resistance - Repair the short to ground on the circuit.
  - If infinite resistance - Replace the component: K9 Body Control Module
- Go to next step: If the specified state
Connect a 3 A fused jumper wire between the test points: Signal circuit terminal 11 & Ground circuit terminal 1
Verify the scan tool parameter: Central Door Lock Switch on Center Console = Lock
- If not the specified state
1. Ignition/Vehicle - Off & Remove - Jumper wire(s)
2. Disconnect the electrical connector: X2@K9 Body Control Module
3. Ignition - On / Vehicle - In Service Mode
4. Test for less than 1 V between the test points: Signal circuit terminal 11@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 11@Component harness & Terminal 19 X2@Control module harness
  - If 2 ohms or greater - Repair the open/high resistance in the circuit.
  - If less than 2 ohms - Replace the component: K9 Body Control Module
- Go to next step: If the specified state
Connect a 3 A fused jumper wire between the test points: Signal circuit terminal 9 & Ground circuit terminal 1
Verify the scan tool parameter: Central Door Lock Switch on Center Console = Unlock
- If not the specified state
1. Ignition/Vehicle - Off & Remove - Jumper wire(s)
2. Disconnect the electrical connector: X2@K9 Body Control Module
3. Ignition - On / Vehicle - In Service Mode
4. Test for less than 1 V between the test points: Signal circuit terminal 9@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 9@Component harness & Terminal 15 X2@Control module harness
  - If 2 ohms or greater - Repair the open/high resistance in the circuit.
  - If less than 2 ohms - Replace the component: K9 Body Control Module
- Go to next step: If the specified state
Test or replace the component: S48A Multifunction Switch - Instrument Panel