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 vehicles systems to power down before an accurate ground or low reference circuit continuity test can be performed.

Ignition OFF, disconnect the connector at the T22 Wireless Accessory Charging Module.
Verify a test lamp illuminates between ground circuit terminal 2 and B+. Ground circuit terminal 2 & Ground
- If the test lamp does not illuminate
  Repair the open/high resistance in circuit 1450 or ground connection.
- Go to next step: If the test lamp illuminates
Ignition ON
Verify a test lamp illuminates between B+ circuit terminal 40 and ground.
- If the test lamp does not turn on and the circuit fuse is OK
1. Test circuit 40 for an open/high resistance.
  - 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.
    Go to next step: Refer to: Retained Accessory Power Malfunction
- If the test lamp does not turn On and the circuit fuse is open
1. Test circuit 40 for a short to ground.
  - 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. Replace the T22 Wireless Accessory Charging Module.
- Go to next step: If the test lamp turns On
Test or replace the component: T22 Wireless Accessory Charging Module