Circuit/System Verification

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.

Ignition ON.
Verify there are no DTCs set related to the forward collision alert or lane keep assist system
- If any DTC's are set
  Refer to Diagnostic Trouble Code (DTC) List - Vehicle
- Go to next step: If no DTC's are set
Verify the B174W Front View Camera - Windshield is properly installed. Refer to Diagnostic Aids for details about identifying a properly installed B174W Front View Camera - Windshield.
- If the B174W Front View Camera - Windshield is not properly installed
  Repair as necessary
- Go to next step: If the B174W Front View Camera - Windshield is properly installed
Verify the are on the windshield in front of the B174W Front View Camera - Windshield is not blocked. Refer to Diagnostic Aids for details about identifying a blocked B174W Front View Camera - Windshield.
- If the windshield is blocked
  Repair as necessary
- Go to next step: If the windshield is not blocked
Verify the scan tool Lane Departure Warning Switch Status parameter is Off.
- If the parameter is not Off
  Refer to Circuit/System Testing - Test 1.
- Go to next step: If the parameter is Off
Verify the scan tool Lane Departure Warning Switch Status parameter is On while pressing the lane keep assist switch.
- If the parameter is not On
  Refer to Circuit/System Testing - Test 1.
- Go to next step: If the parameter is On
Press and release the lane keep assist switch. Verify the lane keep assist indicator on the lane keep assist switch turns on and off with each button press.
- If the indicator does not turn on and off
  Refer to Circuit/System Testing - Test 2.
- Go to next step: If the indicator turns on and off
Drive the vehicle at speed greater than 37 mph (60 km/h) in good weather conditions on a road with good lane markings. Verify the green lake keep assist indicator illuminated on the P16 Instrument Panel Cluster Control Module Control Module and the lane keep assist system is functioning properly.
- If the lane keep assist system does not function
  Refer to Diagnostic Aids to identify conditions that can cause the lane keep assist system to become inoperative and diagnose these systems as necessary.
- Go to next step: If the lane keep assist system functions as normal
All OK. A fault is currently not present and may be an intermittent condition. Refer to Diagnostic Aids. It may be helpful to discuss with the customer the conditions present when the concern occurred, as it might be a normal system response to the driving environment or road conditions.