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Greetings, everyone.

I need assistance. Yesterday, I changed the gaskets in the oil filter housing. In order to create more space, I disconnected the wire to the alternator and removed the negative terminal of the battery. The battery remained disconnected for a significant amount of time, about a couple of hours, while I completed the task.
Subsequently, I reattached the negative battery terminal and started the vehicle's engine. Here is when the problems began.
The vehicle starts and maintains a stationary engine speed. However, the dashboard is not functioning. The only indicator on the dashboard is the letter P, which stands for Parking. The windows are inoperable and the key's lock/unlock function is non-functional. The inside lights are not functioning. The On-Board Diagnostics (OBD) system is malfunctioning, preventing me from connecting to the ISTA+ diagnostic tool. Activating the volume button triggers the display of the iDrive system screen.
The automobile will operate well, however it is unable to shift out of the park position.

Seeking assistance, I resorted to using carrier bags to shield the windows from rain last night due to my inability to shut the windows or secure the vehicle.

Additionally, it is worth noting. Regrettably, I inadvertently closed the trunk after attaching the battery, and now I am unable to reach the trunk since the button is non-functional.

I attempted to connect a jumper pack to the terminals in the engine compartment, but the issue persists.


Is it possible that this issue is caused by a fuse or a relay?

Assistance from anybody would be much appreciated. Assistance in getting access to the boot would be very appreciated, as it would allow me to inspect the fuse box located in the back. The seats in my 5 series cannot be folded down, therefore it may need the use of an angle grinder to do this task.

Thank you in advance.

Check the status of fuse 58 to see whether it is functioning properly. I had a similar issue in the past and resolved it by removing the fuse, hearing a beep, and then reinserting it. As a result, the indicators, dashboard, and speedometer were restored. This occurred with my E92 335d from 2007.

Alternatively, the issue may simply be related to the battery. I suggest disconnecting it once again for a duration of 20 minutes and attempting to restart. If the problem persists, I recommend testing both the battery and the alternator.

Thank you, I will attempt to locate fuse 58 and see whether it is the cause of the issue. I urgently want a method to get entry to the trunk without the requirement to remove the rear seats.
Is it feasible to apply a 12-volt electrical current to the cable at any point?

I am certain that there is information available on how to open the trunk. Please verify whether there is a physical lock located behind the rear number plate area. I am aware that such a lock existed on the E46 model, but I am uncertain if it was discontinued after 2005.

I am considering the possibility that the automobile may see the replacement battery as new and hence need the registration procedure.

The registration procedure for new batteries just modifies the charging parameters and does not address the specific problem you are experiencing.
To activate the boot solenoid, you may supply a 12v voltage to the JBE module. In e9x automobiles, this can be done by connecting the grey/green wire in the large flat connector closest to the bulkhead. I presume that the f1x vehicles would have the same characteristics, however in order to verify this, a circuit schematic would be necessary.

Do I need to locate the wire responsible for the boot lock and provide a 12-volt current to those wires? Can I apply a 12-volt current to the fuse spur in order to activate the boot lock?

The output wire from the JBE is responsible for delivering power to the solenoid after it gets an open request from the button or key fob.

I will attempt it this evening. Thank you. Do you have any insights on the possible causes of the power problems that occur after the boot process?