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Tail lights flash on and go straight off


wgg
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12 plate Ford Focus estate. When I sue the key to unlock the car or when I turn the dial to switch on my tail lights. They come on momentarily then go off again.

Brake lights and all other lights function just fine.

Any help on this matter would be much appreciated. 

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1 hour ago, wgg said:

When I sue the key to unlock the car or when I turn the dial to switch on my tail lights. They come on momentarily then go off again.

Do the front sidelights (Parking lights as they are now called) work ?

The rear tail lights and the front parking lights are controlled by the Body Control Module (BCM) which on some models is known to get water in to the connector and cause corrosion.

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1 hour ago, unofix said:

Do the front sidelights (Parking lights as they are now called) work ?

The rear tail lights and the front parking lights are controlled by the Body Control Module (BCM) which on some models is known to get water in to the connector and cause corrosion.

Yeah the front ones work just fine, where can I find the BCM?

But the fact that it flashes on without fail when unlocking or switching on then goes out straight away is strange

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The BCM is a mini computer for want of a better description.

It is part of the main passenger compartment Fuesbox located under the glovebox.

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2 hours ago, unofix said:

The BCM is a mini computer for want of a better description.

It is part of the main passenger compartment Fuesbox located under the glovebox.

Okay thanks I'll have a look, any other thoughts? 

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Has anyone else got any suggestions on this? Or a wiring diagram or anything? TIA

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