Circuit/System Testing
WARNING: This page is about a different car, the 2008 Cadillac DTS. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition OFF, disconnect the harness connector at the cellular microphone.
- Ignition ON, test for greater than 9 volts between the signal circuit terminal B and ground.
- If less than specified value, test the cellular microphone signal circuit for a short to ground, open/high resistance. If the circuit tests normal, replace the VCIM.
- Test for greater than 9 volts between the cellular microphone signal circuit terminal B and the drain circuit terminal A.
- If less than specified value, test the drain wire for an open/high resistance. If the circuit tests normal, replace the VCIM.
- If all circuit test normal, test or replace the cellular microphone assembly.