Circuit/System Testing
WARNING: This page is about a different car, the 2018 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the S48A Multifunction Switch - Instrument Panel. It may take up to 2 minutes for all vehicle systems to power down.
- Test for less than 10 Ω between the ground circuit terminal 2 and ground.
- If 10 Ω or greater
- Test for less than 2 Ω in the ground circuit end to end.
- If 2 Ω or greater, repair the open/high resistance in the circuit.
- If less than 2 Ω, repair the open/high resistance in the ground connection.
- Go to next step: If less than 10 Ω
- Ignition ON.
- Verify the scan tool Lane Departure Warning Switch Status parameter is Open.
- If not Open
- Ignition OFF, disconnect the harness connector at the K109 Frontview Camera Module.
- Test for infinite resistance between the signal circuit terminal 4 at the S48A Multifunction Switch - Instrument Panel and ground.
- If less than infinite resistance, repair the short to ground on the circuit.
- If infinite resistance, replace the K109 Frontview Camera Module.
- Go to next step: If Open
- Reconnect the harness at S48A Multifunction Switch - Instrument Panel. Ignition ON.
- Verify the scan tool Lane Departure Warning Switch Status parameter while pressing and releasing the vehicle direction warning switch. The parameter should change between Open and Closed.
- If the parameter does not change
Test or replace the S48A Multifunction Switch - Instrument Panel.
- Go to next step: If the parameter changes
- If the parameter does not change
- All OK.