reversing lights - Ford C-Max Forum
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post #1 of 3 Old 10-13-2011, 11:55 AM Thread Starter
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Join Date: Oct 2011
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Can anyone help? First problem with c max in 12 months.
Reverse lights not working, fuses & bulbs fine. what to do next?
petrol 1.8lx 2004.
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post #2 of 3 Old 10-13-2011, 12:38 PM
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Firstly do you know that despite the fuse being OK that you are getting voltage to the protected side
Have you got access to a multimeter that checks resistance that you can check between the fuse and the eart at the rear lights.

It does sound like the gearbox switch has failed which I think I remember is in the upper part of the gearbox to the Near side (passenger UK) under the air intake pipework

54 Plate 1.6 TDCI LX ~aspiring to be something else
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post #3 of 3 Old 10-13-2011, 03:14 PM
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According to Haynes bible, the wires to the switch should be green/black
and green/white with the green/white being the live feed via F84 in the
passengers footwell fusebox. Removing the plug from the switch and
shorting acrossthe contacts with a piece of wire should cause the lamps
to come on. If they do, the switch is faulty. The ignition switch will
need to be in the "on" position. Looking at the drawing, it would appear
that Fuses 11,12 and 25 in the engine compartment fuse box could also
cause the reversing lamps to stop working. Although if F11 has blown, nothing will work! Relay No 41 is also part of
the circuit, and if it's failed there will be no power at F84 or the
switch. F12 feeds the power (Battery live) to the relay, F25 protects
the control side (Via F11 and the ignition key). If F12 has failed there
will be no power to the relay (and F84 and the switch). If F25 has
failed the relay won't work and you will not hear it clicking when you
turn the key. If the fuses are all OK and the relay doesn't click, it's
the relay. There is also a GEM (General Electronic module) Control unit
in the Passengers Footwell box which may be part of the problem but I'm
uncertain as to what it does exactly! Any clues gratefully accepted.
Hope this isn't too involved. Best of luck!

2008 2.0 TDCi Zetec
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