pulled fuses and lost key synchronisation - Mercedes-Benz Forum

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post #1 of 11 (permalink) Old 05-04-2009, 10:04 AM Thread Starter
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Question pulled fuses and lost key synchronisation

Hi Folks,
I pulled a few fuses (all back in correct position ) looking for a problem with the power to my panoramic roof.

The internal cover rides back and forth but the glass part does not open.
I can hear a relay operating.
Unfortunately in pulling fuses both keys no longer operate remotely but do start the car ok.

To get in the car I am having to use the metal key.

Incidently all fuses ok.

model C200k sporte coupe panoramic roof year 2001

Thanks in anticipation
Tim in UK http://www.benzworld.org/forums/images/icons/icon5.gif
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post #2 of 11 (permalink) Old 05-04-2009, 11:20 AM
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Hi

Here's something from the WIS about a stuck panoramic roof - but it doesn't make much sense to me! It suggests that you can 'assist' the movement from inside.

Re the keys, there is a method to re-set the ECU for my CLK. I wonder if that holds the codes for the keys? Worth a try?

1. Turn the ignition key to the 'ON' (not start) position.

2. Press the gas pedal to the floor and hold for five seconds.

3. Turn the key to the "OFF" position (don't remove the key), then release the gas pedal.

4. Wait at least two minutes for ECU to reset.
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post #3 of 11 (permalink) Old 05-04-2009, 12:16 PM Thread Starter
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Quote:
Originally Posted by keyhole View Post
Hi

Here's something from the WIS about a stuck panoramic roof - but it doesn't make much sense to me! It suggests that you can 'assist' the movement from inside.

Re the keys, there is a method to re-set the ECU for my CLK. I wonder if that holds the codes for the keys? Worth a try?

1. Turn the ignition key to the 'ON' (not start) position.

2. Press the gas pedal to the floor and hold for five seconds.

3. Turn the key to the "OFF" position (don't remove the key), then release the gas pedal.

4. Wait at least two minutes for ECU to reset.
Thanks Keyhole for the suggestion, will try a little brute force and not so much ignorance.
Appropriate username for this problem eh?

Something or nothing but the radio seems to have lost its signal strength at the same time. Reception on all stations is v. poor. wonder if the roof aerial is amplified.

I am going to try taking off the battery for a few minutes to reset everything.

I have a code reader but no error codes present.

I suspect I have taken a fuse out of a supply to a volatile memory.

As for the roof, in pulling back the roof switch there is no attempt to move at all, I have tried assisting but wary of smashing the glass.

Fuse 9 is the feed for the roof so I will try removing and see if the relay still goes.

I am familiar with electronics but Mercedes use so many protected methods I expect I will need to touch the wiper with my foot whilst operating the horn and flashing sos with the glove compartment light.

I will try a few more combinations and report back.
Thanks for taking the time.
Tim
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post #4 of 11 (permalink) Old 05-04-2009, 02:05 PM
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Quote:
Originally Posted by timbosss View Post

I am going to try taking off the battery for a few minutes to reset everything.

I suspect I have taken a fuse out of a supply to a volatile memory.
Ref memory loss with the battery disconnected, I spent a few quid at Halfords last year and bought a little gismo called Computer Memory Saver (Draper CMS 1) It runs off a 9v batttery and goes into the AUX socket. I have used it just once, but it did the trick and saved me resetting all my windows, sunroof, steering etc.

good luck with the roof.
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post #5 of 11 (permalink) Old 05-05-2009, 02:18 PM Thread Starter
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Confirmation from wife (driver) that the radio has lost its aerial as if the roof aerial is powered, only faint reception.
There must be a common feed that links all these together.
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post #6 of 11 (permalink) Old 05-07-2009, 10:53 AM Thread Starter
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Thumbs up

Fixed !!

Spoke to an auto electronics dealer, not MB but better because he told me what I needed to know rather than entice me in to spend lots of money.

I checked the fuses already in to make sure they were fully home.
Then checked the spaces against the fuse map and found one missing that had wires going to that slot. 21, 22, 32, 33 were showing under central locking but only 21 and 22 were in place.
Many of the listed fuses were missing but checking revealed that those positions were not wired anyway so this must have been one of the many options.


The sparky told me that once keys were synchronised to the car they stay that way.
If the car battery went flat you would not expect to have to program everything again would you?

The fuse missing was 8 and this position coincides with the hinged boot liner tab so I must have knocked it out trying to fit the fuse flap in the boot.

As for the roof if fuse 9 is removed the inside roof does not work nor does the relay come in.
When fitted the relay comes in, but drops out after a few seconds, due to the motor load detection, i.e. the relay is energised and current fed to the roof motor but being stiff with old grease it loads the motor which is detected so the relay drops out preventing the burning of the armature.

The only way to open the roof it to push the button and lift / push the back part of the window to give it some assistance, then when open re-grease .

All done !
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post #7 of 11 (permalink) Old 05-07-2009, 11:46 AM
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Well done!

Especially confusing as you had 2 faults together - missing fuse + stuck roof. I hope you did 50 repeat openings, as per WIS above!

And good to know that your M-B system protects the motor effectively from burning out if jammed. Did you have to 'reset' your windows and steering, as well?

What about the radio now?
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post #8 of 11 (permalink) Old 05-08-2009, 08:42 AM Thread Starter
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Thumbs up Radio now also OK

Hi Keyhole,
Yes radio working but don't ask me why.
The fuse is Convenience locking via fuses 8, 9, 21, 22, 32, 33.
I would expect they use an aerial amplifier from the windscreen which is powered via this fuse.

As for the roof I did try pushing quite hard but did not see any movement.
I may try WD40 despite the smell (wife will have to wear a stronger perfume)

I have ordered a dvd workshop manual from sunny climes so hope it shows the roof motor position and access.
I will cut and paste a few bits if it turns out to be useful.
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post #9 of 11 (permalink) Old 05-08-2009, 08:40 PM
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Not sure about all your car's details - the WIS is specific about these for the drawings. However could this be close enough to locate the roof motor?
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post #10 of 11 (permalink) Old 05-09-2009, 04:25 AM Thread Starter
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Thumbs up Roof Motor looks same or similar

Hi Keyhole,
Many thanks, the roof console looks the same so I would expect the mechanics to be as near as.

The gearbox and motor are so well shrouded I think it would be worth removing one of the motor wires and powering it independent from the car and give it plenty of current.
I am sure I can get away with 12 seconds or so before damage is done, this may be enough to start the roof movement.

Thank you again for the picture.
It looks like your manual is a pdf so you have to screen dump to export it?
Regards
Tim
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