Skip the auto shop - Our mechanics make house calls

Q: Key will lock doors and trunk, but not unlock doors on 2004 BMW 645Ci

asked by on

I am having difficulties with the passenger window and also the key control.

Passenger window: It is possible to lower the passenger window using the window control, but it will not bring the window up.

Key control: I can use my key to lock the car’s doors, however the key will not unlock the doors.

It will open the trunk, lock all doors, and also will set the alarm. But even if I push the key more, it will not unlock the doors.

In your professional experience, what are the causes to these two problems and how can they be repaired?

A: Hi there. The first thing I would do is try...

Hi there. The first thing I would do is try another key to see if you get the same results from the key control. If the separate key works, then it is the key that is the problem.

If not, then I usually start by reprogramming the receiver module first. If that does not help, then the module may need to be replaced.

As for the window, if a window will go down and not up then the left actuator is bad. It takes more effort to close a window, so a failing actuator cannot close the window. If you need to have this repaired, consider YourMechanic, as a certified mechanic can come to your home or office to diagnose your door locks and windows so that you can have the correct repairs done.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Save up to 30%

Get a quote

What others are asking

Q: How do I replace the battery in my key?

Your key is electronic. That’s what allows the remote to communicate with the various systems on the car. Like all batteries, it will eventually die and need to be replaced. It should last for several years between replacements, though. Here’s...

Q: Fuel door stuck.

How do you open your fuel door? Is there a button that pops it open or to you pull a lever? It is possible that there may be a problem with the switch or cable that opens your fuel door....

Q: Key does not always start car

The issue might not be the lock cylinder. The issue could be your key is worn. Worn keys will not depress the tumbler enough to engage the lock cylinder correctly. When you wiggle the key you depress the tumbler enabling...

Related articles

How to Renew Your Car Registration in Oklahoma(DELETED)
Having your car registered with the Oklahoma Tax Commission is an important part of driving legally in this state. You will need to do this within 30 days of moving to Oklahoma...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...