Diagnostic Test

WARNING: This page is about a different car, the 2017 Jeep Cherokee. However, it is still accessible from the selected car via links, so may be relevant.

CHECK FOR AN ACTIVE DTC
NOTE:
A secure and unmodified mounting location is critical to the proper operation of the Adaptive Cruise Control (ACC) system.

NOTE:
To help in the service of the Adaptive Cruise Control (ACC) system, it is recommended to communicate with the customer to obtain the environmental conditions they were driving in when the cruise control concern took place. Heavy rain, snow, ice, and fog can cause the ACC system to become inoperative. This is considered as a normal operational reaction of the ACC system and no repair is necessary.

NOTE:
Vehicles that have had the suspension modified and/or an aftermarket grill installed that blocks the ACC Module can cause the ACC system to not function properly.
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 STANDARD PROCEDURE .
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 and the mounting bracket and location.
2. Check for:
  - Bent mounting bracket
  - Damage to the ACC Module
  - Damaged, obscured, or out of alignment lens
  - ACC Module not fully seated or broken/missing securing clips
  Were there any problems found?
  
  Yes
  - Repair as necessary in accordance with the Service Information.
  - Perform the ADAPTIVE CRUISE CONTROL VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Align the Adaptive Cruise Control (ACC) Module/sensor lens in accordance to the Service Information. If the alignment is correct, and the DTC continues to set, replace and program the Adaptive Cruise Control (ACC) Module in accordance with the Service Information. Refer to MODULE, ADAPTIVE CRUISE CONTROL (ACCM), REMOVAL .
  - Perform the ADAPTIVE CRUISE CONTROL VERIFICATION TEST. Refer to STANDARD PROCEDURE .