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Rostra Rear Obstacle Sensing System ROSS Pro 250-1594
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Description: Rostra’s Rear Obstacle Sensing System (ROSS) kit is a microwave-based motion sensing system that mounts behind the rear bumper fascia. The system provides four levels of audible and visual alerts as objects approach the rear of the vehicle while backing up. Since the closest sensor zone is approximately three feet off the bumper, this system is not particularly well suited as a parking aide. But unlike most ultrasonic-based parking aide systems, microwave-based systems such as the Rostra ROSS do not change the appearance of the bumper and aren’t effected by the weather.

This review details the installation of the “ROSS Pro” universal installation kit (p.n. 250-1594) on a 2003 Mercury Marauder. General installation instructions for the universal kit can be found here: Universal Installation Manual

Kit was purchased online at

Tools needed:
- 10mm wrench
- Wire strippers/crimpers and (2) insulated 18-gauge butt splice connectors
- One foot each of blue and black 18-gauge twisted copper wire
- Phillips screwdriver
- Utility knife

Additional Parts (recommended)
- Black electrical tape
- (2) 6mm x 20mm thread 10mm hex head bolts
- (2) 6mm lock washers

Installation Steps:
1- Unpack and inspect contents of kit
Major components: Control module, two sensors, audio controller and LED strip. The control module and sensors are weatherproof. Other than the additional bolts and lockwashers recommended above (long bolts provided with kit are too long and must be cut if used), all the mounting hardware required comes with the kit in a bag. Note that the two universal mounting brackets are not used in this installation.

2- Preparing and mounting the control module
Bundle the audio control wires (purple and white) and power wires (blue and black) coming out of the module’s wiring harness by wrapping together with black electrical tape until only approximately 12" of the power wires are exposed. This will aid in running these wires inside the trunk as a set.

Insert a provided long 6mm threaded bolt and flat washer into the control module’s mounting slot.

From under the car and looking towards the rear, locate the round hole in the rear bumper bracket just to the left and above of the rear fascia’s drivers-side lower mounting bracket. Using a flat washer, serrated washer and 6mm nut, secure the control module to the rear bumper bracket through this hole. Tighten nut with 10mm wrench.

3- Mounting the sensors
Locate and remove the threaded inserts on the outboard side of both rear fascia lower mounting brackets.

(driver’s side shown)

Insert a recommended 6mm x 20mm threaded bolt (or a provided long 6mm bolt cut to 20mm in length) and a flat washer into the sensor’s mounting slot similar to control module. Using a flat washer and a recommended lock washer (or provided serrated washer) and 6mm nut, secure the control module to the rear bumper bracket through this hole. Tighten nut with 10mm wrench. Connect sensor wire to module, matching the tape colors on the weatherproof connectors. Secure sensor wires with wire ties.

4- Run audio and power wire bundle into trunk
Remove trunk CD changer trunk liner cover (if equipped) and pull back lower driver’s side trunk liner (various trim retainers). Remove driver’s side trunk rubber grommet / drain plug and cut a small hole in the center large enough to pass audio and power wire bundle through. Insert wire bundle into drain plug and reinstall. Pull wire bundle into trunk.

Route wire bundle to driver’s side trunk hinge area and reinstall trunk liner.

5- Hook up control module power wires
Locate factory wire loom running down driver’s side trunk hinge. Open loom and pull out the black and black/red wires (2003 Marauder). Verify that these wire colors are the same as going to the reverse tail light bulb connector on the inside of the trunk lid. Extend the control module’s blue and black power wires with butt splice connectors and extra wire to reach factory wires. Using provided scotch locks, connect the control module’s blue power wire to the factory black/red wire and the control module's ground wire to the factory black wire (2003 Marauder or as verified at the reverse tail light bulb connector).

6- Mount audio controller, LED strip and connect wiring
Remove third brake light cover mounting screws located on either side of the cover with a phillips screwdriver. Remove the third brake light cover from mounting tabs by pulling up and towards the front of the car. Route the control module’s purple and white audio controller wires under the package tray from inside the trunk and up into the interior next to factory third brake light harness. Connect the control module wires to the audio controller. Peel the adhesive backing off the LED strip and mount as desired to front of third brake light cover. Connect the LED strip to the audio controller. Place a strip of cellophane tape over audio controller’s buzzer to reduce sound level (if desired). Place audio controller under the third brake light cover and reinstall cover.

7- Testing
The system is only active when the key is in the “ON” position with the shifter in “R”. To test the system, park car on level driveway or parking lot, block the tires from rolling and engage emergency brake. With the engine off and the key on, place car into reverse while holding brake and have an assistant walk behind the vehicle at various distances. Observe LED and buzzer actions. Coverage can be adjusted somewhat by changing the side-to-side angle of sensors.

Refer to the ROSS operating manual for safe operation and additional user information: Operating Manual

Click image below to view a short demo:

Keywords: Rear Obstacle Sensing System

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