Tech Tips: Collision Avoidance Systems - BodyShop Business

Tech Tips: Collision Avoidance Systems

ALLDATA offers a brief sampling of OE information for some Cadillac and Mercedes-Benz models.

Collision avoidance used to mean being watchful and reacting quickly in
order to brake or steer out of harm’s way. These days, some vehicles
also “watch,” and when they detect an impending crash, they can
automatically avoid or minimize damage by reacting faster than the
driver can.

The National Highway Traffic Safety Adminstration
recommends that all new cars include collision avoidance systems, and as
these systems become more common, detailed information for removing and
replacing components and/or reprogramming them will be a necessity. Of
course, vehicle manufacturers all have their own systems, requiring
specific procedures for every make and model you see in your shop.

avoidance encompasses many technologies, including automatic braking,
self-steering, drowsiness alarms, pedestrian impact detection and blind
spot scanning. How can you possibly understand these complex systems
without the diagrams and information generated by each OE?

Below –
as an example only – is a brief sampling of OE collision avoidance
information for some Cadillac and Mercedes-Benz models. These may not be
the complete articles or procedures.

Service Procedure
refer to ALLDATA Collision S3500 for safety procedures, identification
of material types, recommended refinish materials, removal and
installation procedures. Always refer to the manufacturer for questions
relating to applicable or non-applicable warranty repair information.

Example One
2012 Cadillac CTS Wagon AWD: Pedestrian impact detection module replacement

Preliminary procedure: Remove the instrument panel compartment assembly.

Parts Required

1. Pedestrian impact detection module bolt/screw (Qty 3). Tighten to 10 Nm (89 lb. in.) (1) (Figure 1).
2. Pedestrian impact detection module (2) (Figure 1).

Caution: Refer to Fastener Caution.

Repair Procedure
1. Disconnect the electrical connectors.
2. Refer to Control Module References for programming and setup procedures.

figure 2Example Two
2012 Mercedes-Benz E 350 Coupe (model 207.359): Remove/install Distronic Sensor (DTR) (distance sensor)

Refer to information on preventing damage to electronic components due to electrostatic discharge.

1. Switch off ignition.
2. Remove radiator grille.
3. Unlock and detach electrical connector (1) on Distronic electric controller unit (A89) (Figure 2).
4. Remove Distronic electric controller unit (A89) from bracket (2) by unscrewing nuts (3) (Figure 2).
5. Install in the reverse order.
6. Perform initialization of Distronic electric controller unit (A89) with Star Diagnosis. Initialization is necessary after:

  • Replacement of or detachment/attachment of the Distronic electric controller unit (A89).
  • Replacement of steering column tube module control unit (N80).
  • Replacement of yaw rate sensor for lateral and longitudinal acceleration (B24/15).
  • Mechanical damage to the Distronic electric controller unit (A89).
  • Accident repairs in front end.
  • Alterations on the camber, track width, caster or of the level of the vehicle at the front or rear axle.
  • Connect Star Diagnosis and read out fault memory.

7. Perform calibration with Star Diagnosis when replacing the Distronic electric controller unit (A89).
8. Read out fault memory with Star Diagnosis and erase if necessary.

Figure 3Example Three
2012 Mercedes- Benz E 350 Coupe (model 207.3): Remove/install sensors for Blind Spot Assist

  • A86/2b1: Right outer radar sensor, rear bumper
  • A86/2b4: Left outer radar sensor, rear bumper

Refer to information on preventing damage to electronic components due to electrostatic discharge.

1. Lift vehicle on lifting platform.

  • Danger!
    Risk of death caused by vehicle slipping/ toppling off the lifting
    platform. Align vehicle between columns of vehicle lift and position
    four support plates at lift support points specified by vehicle

2. Remove cover (1) (Figure 3) when removing the outer right radar sensor on the rear bumper (A86/2b1) with engine 271, 651.
3. Detach
electrical connector (2) from outer right radar sensor on rear bumper
(A86/2b1) or outer left radar sensor on rear bumper (A86/2b4) (Figure
4. Extend outer right radar sensor on rear bumper (A86/2b1)
or outer left radar sensor on rear bumper (A86/2b4) out of bracket (3)
and remove (Figure 3).
5. Install in reverse order.

Example Four
2012 Cadillac Truck Escalade/ESV AWD: Rear object alarm control module replacement

Preliminary Procedure: Remove the front passenger bucket seat.

Parts Required

1. Rear object alarm module nut (Qty 3). Tighten to 2 Nm (18 lb. in.).
2. Rear object alarm module.
Caution: Refer to Fastener Caution.


1. Position carpet in order to access module.
2. Disconnect the electrical connector.
3. Reprogram the rear object alarm module after replacement. Refer to Control Module References.

Kirschenman, ALLDATA collision product manager, holds a bachelor of
science in communication. He has more than 10 years of experience in the
collision industry.

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