Circuit/System Testing

WARNING: This page is about a different car, the 2018 Cadillac XT5. 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: S48B Multifunction Switch - Overhead Console
Test for less than 10 ohms between the test points: Ground circuit terminal 5 & Ground
- If 10 ohms or greater
1. Disconnect the ground connection:
2. Test for less than 2 ohms between the test points: Ground circuit terminal 5 & 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
Perform the scan tool control function: Green Indicator Command - Off
Test for less than 1 V between the test points: Control circuit terminal 15@Component harness & Ground
- If 1 V or greater
1. Ignition/Vehicle - Off
2. Disconnect the electrical connector: X1@K73 Telematics Communication Interface Control Module
3. Ignition - On / Vehicle - In Service Mode
4. Test for less than 1 V between the test points: Control circuit terminal 15@Component harness & Ground
  - If 1 V or greater - Repair the short to voltage on the circuit.
  - If less than 1 V - Replace the component: K73 Telematics Communication Interface Control Module
- Go to next step: If less than 1 V
Perform the scan tool control function: Green Indicator Command - On
Test for greater than 8 V between the test points: Control circuit terminal 15@Component harness & Ground
- If 8 V or less
1. Ignition/Vehicle - Off
2. Disconnect the electrical connector: X1@K73 Telematics Communication Interface Control Module
3. Test for infinite resistance between the test points: Control circuit terminal 15@Component harness & Ground
  - If less than infinite resistance - Repair the short to ground on the circuit.
  - Go to next step: If infinite resistance
4. Ignition/Vehicle - Off
5. Disconnect the electrical connector:X1@ K73 Telematics Communication Interface Control Module
6. Test for less than 2 ohms between the test points: Control circuit terminal 15@Component harness & Terminal 3@Control module harness
  - If 2 ohms or greater - Repair the open/high resistance in the circuit.
  - If less than 2 ohms - Replace the component: K73 Telematics Communication Interface Control Module
- Go to next step: If greater than 8 V
Test or replace the component: S48B Multifunction Switch - Overhead Console