1999 Mercedes Benz CLK320 convertible top

Your convertible top hydraulic pump is not operating. The reason the trunk is not opening with the remote is because the top is not closed. Here is a way you may get it operating again. You need to perform a hard reset of the computers. You will need to disconnect your battery for roughly 15 min. This will hard reset all computers and may allow your pump to reset. After performing this it will be necessary to renormalize your steering angle sensor and windows. Please let me know when you are ready and I will walk you through this.

I have the same problem and I’m ready for the walkthrough the steering angle and window procedure

For the windows it's a simple process. Key on, pull up on the switch until the window stops at fully closed. Hold the switch up for at least 2 more seconds. That will set the up parameters. Now push the window button down and once it's fully down, hold the switch for 2 more seconds. The auto up and down should now be reset.
For the steering angle reset, start the engine. at an idle turn the steering wheel fully from lock to lock 2 times. That should turn off the light on the dash and reset the sensor.