Circuit/System Verification

WARNING: This page is about a different car, the 2019 GMC Savana 3500, 2019 GMC Savana 2500, 2019 Chevrolet Express 3500, and 2019 Chevrolet Express 2500. However, it is still accessible from the selected car via links, so may be relevant.

NOTE:

Refer to Diagnostic Aids before performing Circuit/System Verification.

Ignition ON.
Ignition - On / Vehicle - In Service Mode
Verify there are no DTCs set related to the following system/component:
- Forward Collision Alert
- Lane Departure Warning
- If any DTC is set
  Refer to:Diagnostic Trouble Code (DTC) List - Vehicle
- Go to next step: If no DTC is set
Verify the following component is properly installed:B174W Frontview Camera - Windshield
- If the component is not properly installed
  Repair as necessary
- Go to next step: If the component is properly installed
Verify the condition does not exist:B174W Frontview Camera - Windshield - DirtyorBlocked by debris
- If the condition exists
  Clean the components as necessary.
- Go to next step: If no condition exists
Verify the scan tool Frontview Camera Disable History 1 - 4 parameters do not have any current malfunctions. Refer to Control Module References for scan tool information.
- If the parameter indicates a malfunction
  Diagnose the system that set the malfunction.
- Go to next step: If the parameter is normal
Press and release the switch:Forward Collision Alert Switch
Verify the A5 Driver Information Center=Far/Medium/Near/OFF - The value should change when selecting the different switch positions.
- If not the specified values
  Refer to: Circuit/System Testing - Test 1
- Go to next step: If the specified values
Perform the appropriate scan tool control function:All Indicators
Verify the component activates:Collision Alert - Indicators
- If the component does not work as specified
  Refer to: Circuit/System Testing - Test 2
- Go to next step: If the component works as specified
All OK.