Diagnostic Test

WARNING: This page is about a different car, the 2020 Jeep Renegade. However, it is still accessible from the selected car via links, so may be relevant.

CHECK FOR AN ACTIVE DTC
NOTE:
When servicing the Adaptive Cruise Control (ACC) System, try to determine the operating conditions when the concern took place. Heavy rain, snow, ice, fog or an excessively high ambient temperature can cause the ACC system to become unavailable. This is considered normal. Under such conditions, no repair is necessary.

NOTE:
A secure, unmodified mounting location is critical to the proper operation of the Adaptive Cruise Control (ACC) system. A vehicle with modified suspension or an aftermarket grill that blocks the ACC Module can cause the system to not functioning correctly.
1. Start the engine.
2. Wait a minimum of one minute.
3. With the scan tool, read ACC DTCs and record on the repair order.
  Is the DTC active?
  
  Yes
  - Go To 2
  No
  - Make sure the lens is free of dirt, damage, and other obstructions. If no problems are found, clear the DTC and verify proper operation of the ACC system. Test complete.
  - Perform the ADAPTIVE CRUISE CONTROL VERIFICATION TEST. Refer to ADAPTIVE CRUISE CONTROL (ACC) VERIFICATION TEST .
INSPECT ACC MODULE MOUNTING AND LENS ALIGNMENT
NOTE:
Make sure the ACC Sensor lens is free from dirt and debris (mud, dirt, ice, road debris) that would compromise the function of the ACC system.
1. Perform a thorough visual and physical inspection of the ACC Module, mounting bracket and location.
2. Check for:
  - Bent mounting bracket
  - Damage to the ACC Module
  - Lens damaged, obscured, or out of alignment
  - ACC Module not fully seated
  - ACC Module securing clips broken or missing
  Were any problems found?
  
  Yes
  - Repair as necessary in accordance with the Service Information.
  - Perform the ADAPTIVE CRUISE CONTROL VERIFICATION TEST. Refer to ADAPTIVE CRUISE CONTROL (ACC) VERIFICATION TEST .
  No
  - Perform the Adaptive Cruise Control (ACC) Module alignment procedure in accordance to the Service Information. Refer to MODULE, ADAPTIVE CRUISE CONTROL (ACC), MODULE PROGRAMMING .
  - If the alignment is correct and the DTC continues to return, replace and program the Adaptive Cruise Control (ACC) Module in accordance with the Service Information. Refer to MODULE, ADAPTIVE CRUISE CONTROL (ACC), REMOVAL AND INSTALLATION .
  - Perform the ADAPTIVE CRUISE CONTROL VERIFICATION TEST. Refer to ADAPTIVE CRUISE CONTROL (ACC) VERIFICATION TEST .