Buick Regal: Radar Sensor Module - Long Range Learn

NOTE: Adaptive Cruise Temporarily Unavailable service message may be displayed if this calibration procedure has to be performed. The radar may have become misaligned.

After replacing and programming the Long Range Radar Sensor Module, it is necessary to perform a calibration procedure to align the radar. This is indicated to the technician by DTC B101E 4B.

Calibration is performed while driving the vehicle with the scantool connected. Calibration is initialized using a scantool and the scantool must remain connected until calibration is complete. During this time the "Service Driver Assist" service message will be displayed. Once the procedure is complete, the service message will turn off and normal operation will resume.

Calibration is not required if the existing module was reprogrammed only. Calibration needs to be conducted if the module was replaced or removed and re-secured.

If calibration is not successful, it could be due to improper driving environment, module and bracket assembly bent out of position or incorrect module mounting. A typical driving environment is usually sufficient to calibrate the module within 10 - 30 minutes. Visually inspect for damaged, bent, or broken Long Range Radar bracket. Brackets out of level more than 2 degrees will not calibrate or self-learn.

Discuss with the customer about vehicle history and possible past accident. Replace bracket if damaged.

Calibration Procedure

1. Verify no other DTCs except for B101E 4B Electronic Control Unit Software are present.

• If other DTCs are present

Refer to service information and repair as necessary.

• Go to next step: If no other DTCs are present

2. Prior to driving the vehicle make sure the surface in front of the radar (Cadillac emblem) is clean.

Also verify the mounting area is not damaged and allows the module to face the intended direction.

3. Prepare scantool to be mobile for Long Range Radar Calibration driving phase. The scantool needs to stay connected during the driving phase of the calibration.

4. Engine running.

5. Initiate calibration using Long Range Radar Sensor Module Learn in the scantool. The driver information display will display "Service Driver Assist" message during calibration.

NOTE: Do not back out of screen or press any other buttons until the calibration is complete.

6. Drive the vehicle within the following conditions for 10 - 30 minutes or until calibration is complete. The "Service Driver Assist" message will turn off when calibration is complete.

• Drive at speeds greater than 56 kph (35 mph)
• Minimize tight curves
• Avoid extreme acceleration or deceleration
• Follow one or multiple vehicles. (typical vehicle traffic is sufficient, but vehicles 30 - 50 m (100 - 165 ft) away are most effective at decreasing the calibration time)
• Drive in an environment that has stationary objects on the side of the road (street signs, guard rails, mail boxes, fences, etc)

7. Verify proper calibration by observing that the "Service Driver Assist" message turns off within 10 - 30 minutes of normal driving.

• If "Service Driver Assist" message fails to turn off

1. Verify correct operating conditions were met
   • If incorrect driving environment, refer to If Slow to Calibrate and repeat calibration procedure following recommended operating conditions.
   • Go to next step: If correct driving environment
2. Verify DTC B390C 66 Incorrect Mounting is not set
   • If B390C 66 is set

     Refer to DTC B390C.

   • Go to next step: If B390C 66 is not set

• Go to next step: If "Service Driver Assist" message turns off

8. Drive at speeds greater than 40 kph (25 mph) and verify engagement of Adaptive Cruise Control (cruise control icon will change from white to green)

• If Adaptive Cruise Control will not engage

Check vehicle for DTCs and correct as required.

• Go to next step: If Adaptive Cruise Control engages

9. All OK.

If Slow to Calibrate

The ideal calibration condition is driving on a freeway or two lane road with medium traffic. One or more of the following conditions may increase the length of time required to complete the self-calibration procedure:

• Visually inspect for damaged, bent, or broken Long Range Radar bracket. Brackets out of level more than 2 degrees will not calibrate or self-learn. Discuss with the customer about vehicle history and possible past accident. Replace bracket if damaged.
• Heavy traffic - following too close behind vehicles for long periods (more than 40 min)
• Stop and go or very slow traffic
• Mountain roads
• Constant sharp curves in roadway
• No traffic - if no traffic is available, may need to add vehicle ahead to support calibration
• Limited or no stationary structures on side of the road - need structures such as street signs, guard rails, mail boxes, parked cars, etc.
• Driving in tunnels

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