Circuit/System Testing
WARNING: This page is about a different car, the 2013 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
The ignition circuit controls multiple modules/components. Each of the modules will need to be disconnected if the ignition circuit test fails for a short to voltage or short to ground. Disconnect one module/component at a time while testing the ignition circuit for a short to voltage or short to ground. If the fault is no longer present when disconnecting a module/component replace that module/component. If the fault is still present with all the module/component disconnected repair the circuit.
- Ignition OFF, disconnect one of the connectors listed below at an inoperative module/component:
- Antenna Module
- Radio/HVAC Display X1
- Radio/HVAC Display X2
- Audio Amplifier X3 (UQA only)
- Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal listed below and ground.
- Antenna Module - terminal 1
- Radio/HVAC Display X1 - terminal 4
- Radio/HVAC Display X2 - terminal 3
- Audio Amplifier (UQA only) - terminal 8
- If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance. If the circuit tests normal replace the Radio.
- If all circuits test normal, replace the module/component that was disconnected in step 1.