BMW 318i boot locked can’t get into

[ArunNewmark]

Hi, my BMW has no power at all going to it. The boot is locked with about £500 worth of tools and stuff in but the other doors are unlocked. I recently replaced ecu and when I did that the car started once and then stopped starting so I tried jump starting it and no luck and then I tested the battery it was on 8Volts. I shut the boot and it locked and then all the other doors diddnt. I thought it could’ve been the new ecu I put in so I put the old one back but it diddnt seem to make a difference. I can’t access the battery as it’s in the boot and I can’t get into the boot through the back seats or unlock it manually with a key. I don’t know what to do.

[Ossie D]

Can you charge the battery or use a jump box by connecting to the positive and negative terminals under the hood on the right side? Also check for a valet switch in the glove box.

[Greydog]

Morning Arun

Welcome to the Forum

As Ossie has pointed out you can open the bonnet and access the Charging points under the bonnet that should allow power to the boot. You should never charge a BMW direct to the Battery terminals (unless it is disconnected as damage can occur due to voltage surge.

However I think your issue may be deeper than just a dead battery. You say you changed the ECU ? when you did, did you also change or re-program the EWS to recognise the new ECU ? If not the EWS has probably activated the immobiliser. If you did register the ECU to your chassis and match it to the EWS then reregister the keys with luck it is just the dead battery

Dave

[Greydog]

Sorry Ossie

Welcome to the Forum

Dave