My sunroof close perfect but it do not open at once I have to press and press the botton several times becouse it stops and stops!, it do not move more than 3 inches every time that I press the botton to open it!, but it close perefect at once!.
It´s a Mercedes-Benz C230 2004
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Sunroof Description and Operation (One Connector System)
This diagnostic procedure is to be used for the 1 connector Sunroof System that combines the sunroof control module with the sunroof motor/actuator.
The Sunroof System consists of the following components:
• BATT MAIN 2 Fuse 50 A
• Body control module (BCM)
• RAP relay
• S/Roof Fuse 20 A
• Sunroof module (includes sunroof motor/actuator)
• Sunroof switch
The Sunroof System is controlled by the sunroof switch and the sunroof motor/actuator assembly.
When the ignition is turned to RUN or ACCESSORY, or when the retained accessory power (RAP) system is active, the body control module (BCM) applies a ground to the RAP relay in the instrument panel (I/P) fuse block. This activates the RAP relay and allows battery positive voltage to be applied through the SUNROOF Fuse to the sunroof module. Ground for the sunroof module is supplied from G302.
The sunroof can be placed in 3 preset positions:
When the sunroof switch is placed in the OPEN position, a ground is applied from the sunroof switch low reference circuit , through the sunroof switch and to the sunroof switch open signal circuit. The sunroof motor/actuator then applies voltage to the sunroof motor open control circuit and applies a ground to the sunroof motor close circuit. The sunroof motor then opens the sunroof to the full open position.
When the sunroof switch is placed in the VENT position, a ground is applied from the sunroof switch low reference circuit , through the sunroof switch and to the sunroof switch open signal circuit. The sunroof module then applies voltage to the sunroof motor open control circuit and applies a ground to the sunroof motor close circuit. The sunroof motor then opens the sunroof to the VENT position.
When the sunroof switch is placed and held in the CLOSED position, a ground is applied from the sunroof switch low reference circuit , through the sunroof switch and to the sunroof switch close signal circuit. The sunroof module then applies voltage to the sunroof motor close control circuit and applies a ground to the sunroof motor open circuit. The sunroof motor then closes the sunroof.
The sunroof can be placed in any preferred open position when:
• The sunroof is in the fully opened position by pressing and holding the sunroof switch in the CLOSE position until the panel has reached the desired position then release the CLOSE switch in order to stop the sunroof
• The sunroof is opening, it can be stopped by momentarily pressing either side of the switch.
The sunroof control module, sun roof actuator, and the sunroof motor are integral parts of the sunroof module assembly and are not service separately.
Your best bet , take it to a qualified repair shop or buick dealer .
I had a friend with a similar problem. the gears in the motor are plastic they tend to wear down to the point they stop making contact. Have someone press the botton and you can pull on the sunroof in the derection to close it. This is what i did for my friend and it worked out fine.
I have just repaired a similar problem on a 2003 F150 crewcab sunroof. It opened and would not close. Pressing the switch to open made a click(no bad fuse or breaker.) Pressing it to close made no noise. I checked the switch with a VOM, it was fine. I used jumper wires to reverse polarity on the motor leads (purple and blue) between plug from express open module (black box) and motor connector (excluding limit switch.) I was hoping just to close the roof until Monday. Pressing the switch made the roof closed perfectly both ways (no problem with regulator or motor.) I focused on the limit switch in side the gearcase on the motor. The grease was melted and had swamped the switch with oil. I cleaned the limit switch with electronic cleaner and reassembled the gearcase, paying close attention to the alignment of the sequencing cams (there's a window to check the marks.) With everything hooked up and the headliner back in place it seems to work perfect.
I think I know the answer....your gear has slipped on the cable a few teeth. Set the roof to the desired closed position, flush with your roof. Then open the panel above the mirror by first prying off the switch plate and removing the two 10mm bolts holding the mirror. Remove the sunroof motor gear, or rather just lower it out so it is disengaged with the cables. Now connect the switch and hit the auto open button as if you wanted to open the roof with single flick of the switch. Now hit the auto close button (same button of course, but the single touch method). The motor will advance and stop to where it thinks the roof should be, closed, which it is. Reassemble the gear into the slot, test it if all good, replace the mirror and panel.
press and hold botton down till the window get to the botton and stops then without stopping press and hold up and when the window gets to the top wait 2 seconds the the display should say window set then you can let go