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Electronics In Car Entertainment (ICE), Sat-Nav, lighting, wiring etc.

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post #1 of 35 (permalink) Old 1 Week Ago Thread Starter
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07 Megane totaly dead

Hi All.
I am new to the forum and hoping somebody can help with an electrical/electronic problem I have. I have read through similar experiences but cant find anything total like my issue.
I started off when I was unable to open the door using the key card so I used the manual key instead. I got in the car and started as normal. I tried to use the indicators but they were not working. On the dashboard display were various warning messages such as brake failure, steering unlocked. I stopped the engine and called roadside assistance. While waiting for the recovery vehicle, I started the engine again, The same warning messages were there so I tried to stop the engine bit it wouldn't so I had to stall it in gear. Now all the lights came on ( I couldnt turn them off), indicator lights on but not flashing and electric windows not working.
When the recovery vehicle arrived, he started the car but he also had to stall it to stop it. He plugged in the computer diagnostics which came up with a fault with the glow plug module control circuit. The car was taken back to my home and nothing at all was working, I assumed because the battery was now flat.
5 minutes after the recovery vehicle left, all the lights suddenly came on again without me touching the vehicle. I had to disconnect the battery (earth first) to turn everything off.
The next day, while i was in work, a friend had a quick look for me. He suspected a faulty battery so went out and bought a new one but it was still totaly dead. He also bought a new battery for the keycard.
I have read all the similar faults with the warning messages and damp in the ecu /fuse box. I have checked the fuses on the battery and there is good continuity across theses terminals. Full battery power is going to the big bolt terminal at the engine bay fuse box and also to the ECU and everything is looking clean with no sign of any water corrosion to the terminals. However, absolutely nothing is working electrically.
Sorry about the long winded first post but I know with fault finding its important to get all the facts.
Does anybody have any suggestions of what it could be. Would an ECU failure show up as this intermittent fault followed by the vehicle being totally.
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Re: 07 Megane totaly dead

Check the earth straps. It might be worth checking the BSI for any loose connectors and fuses.
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Re: 07 Megane totaly dead

And for damp inside car..... floor, underfloor cubby holes and up behind dash.
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Re: 07 Megane totaly dead

Thanks for the replies. I get full battery voltage between the battery +ve terminal and the engine and bodywork earth. Where Would I find the BSI. Is this the body control module? What function does it have?
I have checked inside the car and its bone dry and all the fuses are intact.
If there was a fault with the ECU , would I not be able to switch on anything- interior lights, hazard lights, radio.
I dont get any reaction at all on the central locking when using the key card either.
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Re: 07 Megane totaly dead

ECU Stands for ENGINE control Unit. So NOT that.
BCM (UCI French name) Is the BODY control module.
WTF is a BSI?
Have you checked the Fuses on the Battery +Ve Connection?

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Give a n00b the answer he will be learn for a day; show him the search button, he will learn for life.
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