Adaptive Cruise Control Aligning Forward Looking Sensor (FLS) DTC C1002 - keywords ACC adaptive cadillac control cruise FLS GMX215 inoperative radar learn relearn sensor

The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.

When aligning the Forward Looking Sensor (FLS), it is important to follow SI document 1746467. The procedures listed for the 2007 model year is incorrect. The steps below were taken from SI document 1746467. However an additional Adaptive Cruise Control Horizontal Adjustment Table is available in the document 1746467.

Please refer to the procedures below and document 1746467 when aligning a Forward Looking Sensor (FLS).

1. Place a bubble level against the front of the radar. Adjust the vertical control until the radar is level.
2. For horizontal adjustment, measure the back of the horizontal adjuster. Adjust the horizontal until 6 mm (0.25 in) of the adjuster is protruding out behind the radar. This method should work assuming that the bracket and frame have not been damaged in a collision.
3. Use a scan tool to perform a Factory Reset of the adaptive cruise module (ACM). Ensure that the Auto Alignment Learn Status parameter indicates Not Aligned. This allows the forward looking sensor (FLS) to automatically align itself during vehicle driving.
4. Drive the vehicle at speeds of at least 56 kph (35 mph), so that the automatic alignment process can operate. The process requires the radar to observe stationary targets along the edge of the road (i.e. mail boxes, parked cars, poles, signs, etc.). Do not follow other vehicles too closely, since this obscures the view for the radar.
5. Use a scan tool to monitor the Auto Alignment Learn Status parameter. Continue driving until the Auto Alignment Learn Status parameter indicates Aligned. Typically, it will require less than 10 miles of driving. If not proceed to step #4. If the resulting Alignment Error is within -1.5 and 1.5 degrees, the alignment is within specification. Otherwise, proceed to step #6.
6. Adjust the horizontal adjuster according to the Alignment Error chart provided below. Then, repeat steps 3, 4, and 5.

Note: It is important when performing a wheel alignment service on a vehicle equipped with the ACC System, to change the Auto Alignment Learn Status parameter in the DSCC scan tool data list to not Aligned. The Auto Alignment Learn Status parameter of the DSCC needs to read Not Aligned to allow the FLS to automatically align to the vehicles new wheel alignment setting. Driving the vehicle in an area with stationary objects will cause the FLS to automatically align horizontally to the vehicles new wheel alignment setting.

Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.