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Saturday 13 June 2009

Discovery 2 parking sensor controls

That didn't last long. I am not keen on the parking sensors coming on automatically whenever I select reverse gear.

By removing a single green/brown wire, the sensors can still be activated by the button on the dash but selecting reverse gear does not activate them.

How I Did This

The reversing sensor control unit is behind the trim in the rear left hand corner.
It can be easily reached by removing the small grill by the back door catch.

The buzzer is separate connected using a pink and brown wire.  This goes back to the larger beige
connector on the unit.

The smaller black connector on the unit is connected to the sensors on the rear bumper.

The other larger beige connector has the power and connections to the switches.

To disconnect the reverse gear switch remove the Green with brown stripe wire.
Be careful, there is a bright green with yellow stripe which looks similar but is the live feed.

The Green/Brown wire goes to 12V when the gear lever selects reverse gear.

To remove the wire:
1. unplug the larger connector and bring it through the trim panel.
2. Cut the cable tie
3. Carefully prise apart the top part of the casing and fold back the small flap of plastic
4. With a small screwdriver or two pull apart the outer casing of the connector and push the
    white part out one end.  Only one end is open so it is obvious which way it can slide.
    Pushing a screwdriver in the other end while pulling both sides apart is fiddly but easy enough.
5. With the white part out use a tiny watchmakers screwdriver to push the metal catch on the
    socket connected to the Green/Brown wire while gently pulling on that wire.  It will come out
    easily if you have pushed the tiny metal catch far enough in.
6. With the socket out, wrap it in insulation tape making sure that tape will not come off.
    The wire goes live when on so you don't want an accidental short to the chassis in the future.
    I like to double wrap it and secure it back to the other wire so it does not dangle.
7.  Reassemble in reverse of the above.  You'll need a new cable tie to finish the job.

Larger connector wiring:
Side One pins
Pink - to buzzer

Side two pins
Black - probably ground to the chassis (always has zero resistance and zero volts when tested)
Green/Brown - To reverse gear lever switch
Brown - to buzzer
Green/Yellow - 12V when ignition on


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