Allspark Auto Electrical

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Below are just some of the more common faults I’ve come across and solutions I’ve provided.

Please note that I cannot accept liability for any damage or injuries received or inflicted as a result of any repairs attempted.

The window/door control module is built onto the bottom of the drivers door window motor. Due to its mounting location and angle, water can penetrate the connector and cause shorting.

You’ll know straight away if this is the culprit as when you disconnect the plug, orange water will usually run out of the joint.

Examine the pins and receivers for corrosion damage. If you’re lucky and you catch the problem soon enough it should clean up with some WD40 and a toothbrush.

If you find you have no power to the ignition circuit, no warning lights on the dash etc. it would be very easy to assume that the immobiliser has developed a fault. There is an additional megafusebox hidden under the carpet in the drivers foot-well. One of the fuses contained therein governs power to the ignition and fuel pump circuits. It’s an absolute swine to get at and requires the drivers seat be removed. If one of the fuses has blown, check the megafusebox in the boot as some models often have redundant ones there that can be utilised.

A poorly fitted replacement windscreen can result in water leaking down the firewall. There are 3 wiring loom connector joints at the bottom of the firewall on the passenger side that with water ingress can short resulting in a variety of intermittent faults and battery drain conditions. Evidence of this problem will be lots of water under the carpet in passenger side front and rear foot-wells. The leak must be cured before thoroughly drying and cleaning the joints to resolve the faults.

Mk3 onwards: If your fitting an after-market radio in one of these you may have a problem finding an ignition switched live feed. As with many modern cars the switched feed has been replaced with a pulsed feed which won’t work an after-market radio. An ignition switched 12v feed can be found at a relay holder (vacant on some models) on the fusebox behind the glove compartment.

If you find you have erratic or no tail lights you’ll need to get down and crawl around under the flat-bed. The wiring loom where it passes just above the rear axle on the driver side chassis leg can chafe and fray leading to open circuits and shorts. The exposed/broken cables will need to be cut back and new sections of cable soldered in place.