GM Service Manual Online
For 1990-2009 cars only
  1. Place a bubble level on top of the radar. Adjust the vertical control until the radar is level.
  2. For horizontal adjustment:
  3. 2.1. Measure the back of the horizontal adjuster.
    2.2. Adjust the horizontal until 6 mm (0.25 in) of the adjuster is sticking out behind the radar.
  4. At this point the radar will do an automatic adjustment to align the radar. Use a Tech 2 and check the Auto Alignment Learn Status. The Tech 2 should indicate Aligned. If not, proceed to step 4.
  5. Use a Tech 2 and the Adaptive Cruise Control Horizontal Adjustment Table. Using the Tech 2 Alignment Error, adjust the horizontal until the alignment error is between -2.5 and +2.5 degrees.
  6. Cycle the ignition. Use a Tech 2 and check the Auto Alignment Learn Status. The Tech 2 should indicate Aligned. If not, repeat step 4 until aligned.

Adaptive Cruise Control Horizontal Adjustment Table

Tech 2 Alignment Error - Degrees

Number of Turns of Adjuster

RHT (Right-Hand Turn)

LHT (Left-Hand Turn)

Lower Limit

Upper Limit

-5.85

-5.549

9 ½

RHT

-5.55

-5.249

9

RHT

-5.25

-4.949

8 ½

RHT

-4.95

-4.649

8

RHT

-4.65

-4.349

7 ½

RHT

-4.35

-4.049

7

RHT

-4.05

-3.749

6 ½

RHT

-3.75

-3.449

6

RHT

-3.45

-3.149

5 ½

RHT

-3.15

-2.849

5

RHT

-2.85

-2.549

4 ½

RHT

-2.55

-2.249

4

RHT

-2.25

-1.949

3 ½

RHT

-1.95

-1.649

3

RHT

-1.65

-1.349

2 ½

RHT

-1.35

-1.049

2

RHT

-1.05

-0.749

1 ½

RHT

-0.75

-0.449

1

RHT

-0.45

-0.149

½

RHT

-0.15

0.149

0

--

0.15

0.449

½

LHT

0.45

0.749

1

LHT

0.75

1.049

1 ½

LHT

1.05

1.349

2

LHT

1.35

1.649

2 ½

LHT

1.65

1.949

3

LHT

1.95

2.249

3 ½

LHT

2.25

2.549

4

LHT

2.55

2.849

4 ½

LHT

2.85

3.149

5

LHT

3.15

3.449

5 ½

LHT

3.45

3.749

6

LHT

3.75

4.049

6 ½

LHT

4.05

4.349

7

LHT

4.35

4.649

7 ½

LHT

4.65

4.949

8

LHT

4.95

5.249

8 ½

LHT

5.25

5.549

9

LHT

5.55

5.849

9 ½

LHT