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Obviously if the faults relate to OEM equipment and the car is still under warranty then head for your dealers and let them sort it out. Assuming that is not the case, at this stage its difficult to offer any sensible advice without more information about your vehicle, and a better description of when/how the problem arose - for instance whether the fault(s) appeared separately or when/just after you carried out any modifications to the vehicle. <o:p></o:p>

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So can you please start by posting up all the usual stuff - model, trim & year, and name/specs of the modification equipment you were installing. <o:p></o:p>

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As you mention problems with the door locking and headlights, it would be good to know for certain if these working OK originally. Likewise did you carry out a pre-installation check of the add-on equipment prior to installing it in the car or did you assume the stuff in the box was serviceable? <o:p></o:p>

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Assuming we are talking about only electrical problems which arose after you carried out a modification to the car, then its best to try and be methodical. Start by checking carefully to identify what if any other electrical faults exist in the car - not just things you upgraded but other electricals heaters/wipers etc. Knowing what works and what does not, can sometimes help narrow down where a fault lies especially if the circuit diagram shows they all depend on some common component - eg a relay or fuse. In which case focus you attention there.<o:p></o:p>

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If you are lucky you may find all the faulty items are covered by the same fuse, relay or multi-pin connector and replacing/refitting the item will get things going.<o:p></o:p>

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If all the fuses are OK then its seems likely you have inadvertently disconnected, or failed to reconnect something, or worse still got wires mixed up whilst wiring in your upgrades, so if you are not confident of your work then you really should consider calling in an auto electrician.<o:p></o:p>

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If you are feeling brave you will need to carefully retrace your steps checking everything you altered is right - it can be easy to connect terminals the wrong way round. Don't just focus on wires/connectors you had to disconnect - its easy to disturb adjacent wiring or connectors so just check any neighbouring connectors are snug, with no wires hanging loose.<o:p></o:p>

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Obviously its very difficult to offer advice on aftermarket add ons as there are so many out there, but if the problems relate to an aftermarket kit your best bet is usually to check the manufacturers website FAQs or contact them direct.<o:p></o:p>

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Good luck

Skimad
 
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