Distance Sensor: Adjustments

STANDARD PROCEDURE - ACC SENSOR ALIGNMENT

Special Tools:






The adaptive speed control sensor (also known as the Adaptive Cruise Control/ACC sensor or module, or the radar sensor or module) requires alignment whenever the ACC sensor is removed and reinstalled, whenever front end structural repairs are performed or whenever a Diagnostic Trouble Code (DTC) indicates ACC sensor adjustment is required. Sensor alignment consists of performing the mechanical vertical alignment described in the following procedure, followed by the electronic horizontal alignment that is performed with a diagnostic scan tool and the appropriate diagnostic information during a 10 minute drive while maintaining a steady, predetermined vehicle speed.

VEHICLE PREPARATION FOR SENSOR VERTICAL ALIGNMENT

1. Repair or replace any ineffective, worn or damaged body or suspension components that could hinder proper sensor alignment.
2. Verify proper tire inflation pressures.
3. Remove any accumulations of mud, snow or ice from the vehicle underbody.
4. Verify that there is no load in the vehicle (cargo or passengers), except for the driver.
5. The fuel tank should be FULL. Add 2.94 kilograms (6.5 pounds) of weight over the fuel tank for each estimated gallon of missing fuel.
6. Verify correct vehicle suspension height.

NOTE: The vehicle MUST be placed on a known level horizontal surface such as a wheel or frame alignment rack to achieve satisfactory sensor vertical alignment results.

7. Rock the vehicle side-to-side three times to allow the suspension to stabilize.
8. Jounce the front suspension three times by pushing downward on the front bumper and releasing.

SENSOR VERTICAL ALIGNMENT





NOTE: The graphic shows Special Tool No. installed on the adaptive speed control sensor with the front fascia removed for clarity; however, it is NOT necessary to remove the front fascia to install the special tool or to perform the following procedure.

1. The adaptive speed control sensor (4) (also known as the Adaptive Cruise Control/ACC sensor or module and the radar sensor or module) is located on a bracket (6) secured near the center of the underside of the front bumper support member of the Front End Module (FEM) behind the front fascia.
2. Unsnap and remove the molded plastic bezel in the center of the grille texture insert of the lower air intake opening of the front fascia.
3. If equipped, unsnap the plastic bezel (mirror cover) from over the front of the sensor housing.
4. Clean any dirt or road salt from the convex molded dark plastic lens (radar dome) on the face of the sensor as well as from the suction cup of the vertical alignment tool (3) (Special Tool No. ).
5. Carefully slide the vertical alignment tool through the front fascia lower air intake opening and over the sensor housing until the suction cup rests against the lens of the sensor.
6. Depress the plunger (1) of the vertical alignment tool to engage the suction cup and attach the special tool securely to the lens of the sensor.
7. Use the 3.5 millimeter hex nut driver (Special Tool No. ) to rotate the two adjustable ball studs (5) that secure the sensor to the mounting bracket as necessary to center the bubble of the spirit level (2) between the two center marks on the vial of the level located on the top of the vertical alignment tool.
8. Depress the center release button (7) to release the suction cup from the sensor lens and remove the special tool from the sensor.
9. If equipped, reinstall the plastic bezel (mirror cover) over the front of the sensor housing.
10. Reinstall the molded plastic bezel into the center of the grille texture insert of the lower air intake opening of the front fascia.
11. Use a diagnostic scan tool and the appropriate diagnostic information to perform the horizontal sensor alignment procedure.