BenzWorld Senior Member
Date registered: Aug 2006
Vehicle: '03 SLK32 AMG
Location: Tulsa, OK
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Hey Mike, welcome to benzworld.
There are a few switches/sensors you need to make sure are activating between each cycle.
Bazzle, please correct me if I'm wrong because I'm doing this from memory and I've slept since last taking the trunk apart.
The trunk latch and trunk cover switches are the obvious ones, if they're not engaged nothing will work, but you knew that, so skipping on...
First sequence is the trunk opens backwards. This hits a sensor located on the passenger (US, so... right side). It's right above the roof motor, it's a little peg a little over an inch long. When that is hit by the roof bar, it activates the next step.
Second sequence, the roof detaches and moves into the trunk. This hits a sensor "somewhere" (bazzle?) and causes the trunk to lower again. When the trunk lowers, it hits a similar switch in the left side (drivers side for US) near the rear of the trunk under the panel (as i said, similar to the other one). When this is hit, cycle is completed.
Similar to going up... BUT, when the final switch is hit, it triggers the small windows to go up. I had the problem where the pump keeps running but the small windows remain down. It seems that last switch went bad. I took it to the dealer and they replaced that switch. Works great now.
From the problem you describe where "the top comes unlatched and then everything stops moving but the pump continues to run" do you mean it just stops immediately after being unlatched or do you mean it stops after being lowered into the trunk? If it stops after being lowered and the trunk never closes, then I would start with the sensor that triggers the trunk lid closing. Conveniently it's the only one I didn't mention, hopefully bazzle or someone can help out finding this sensor.