CL Electrics - First parking, then thermometer, now locks

[WCA]

My CL electrics have started to play up.

First the parking sensors stopped working. Instead of the displays showing nothing and then the individual bars lighting up as i approached something, now the 2 red bars light up immediately and stay on with an irritating beep until I turn off the parking sensors. This first happened immediately after it was in for some work with a local Merc specialist. I took it back, he plugged in the computer and reset everything and it seemed to work for a while and then the fault started happening intermittently at forst but is now permenant.

In this recent cold snap the thermometer has started to play up. Recently after scraping thick frost off the car I turned on the ignition and discovered that it was showing 12.5 degrees outside despite being parked on the drive all night and the ice on the bonnet.

Now I have just tried to lock the car and the little black button on the door didn't work. I tried the key fob and that didn't work. I ended up using the little metal key and that only locked the drivers door. Strangely when I used the button on the boot, the central locking worked fine.

Just remembered, occassionally the windows don't raise the little bit they drop when you open the door. If you press the window button they close fine. This is an intermittent issue.

Any suggestions of what I should look at before I take it to a garage and get my wallet raped?

 

[WCA]

7 views and no replies :-(

Either the forum is quiet or this is going to be expensive

 

[television]

Just give a little time to think about this, many faults and not sure yet of an answer.

You will get a reply

 

[WCA]

Cheers - Just fearing the bills

 

[Xtractorfan]

I wonder did your merc guy have the front bumper off ..this would explain possibly the temp fault and the parking sensors, many guys remove these bumpers forgetting that they are hard wired to the car and end up pulling the connectors apart..

 

[television]

As Xtractorfan , thats a thought, defiantly there is one or two sensors either with a poor connection or faulty.

The thermometer probe is also under the bumper.

Before any more on the central locking,,what did the car go in for

 

[WCA]

Right Guys. The bumper suggestions makes sense as the car was resprayed a day or so before I took it to the garage and the spray shop would have had the bumper off. I think that should fix the parking sensors and the thermostat.

Looks like we are just trying to solve the central locking now. The symptoms are:

Door button doesn't lock the doors.
Key fob doesn't lock or unlock the doors.
Touching the door handle while using the proximity card doesn't unlock the doors.
The boot opens and locks via the proximity sensor.
Locking the boot also (correctly) locks the doors.

Is there something that controls the doors but not the boot locks?

 

[television]

Try this,,press any button on the remote and put it in the ignition switch with a few seconds, cant remember if you turn the key to 2, but try it both ways

 

[meanie]

Re the last 2 problems-I've had similar faults with a number of XK 8s',& each time It's been sorted by replacing the vehicle battery,apart from on 1 occasion when it was down to a tired alternator.
Apparently,these systems are over sensitive to low battery voltage,which occurs when the battery is subjected to the heavy load required by the starter,so,although the car seems to start ok,the voltage drops to below what these systems deem to be critical.
Not saying that the same applies to your Merc,but it may be worth a check of your battery condition & charging circuit all the same.

 

[television]

Re the last 2 problems-I've had similar faults with a number of XK 8s',& each time It's been sorted by replacing the vehicle battery,apart from on 1 occasion when it was down to a tired alternator.
Apparently,these systems are over sensitive to low battery voltage,which occurs when the battery is subjected to the heavy load required by the starter,so,although the car seems to start ok,the voltage drops to below what these systems deem to be critical.
Not saying that the same applies to your Merc,but it may be worth a check of your battery condition & charging circuit all the same.

Certainly a battery off and on 5 mins later may re set it

 

[WCA]

Right then. Thanks foir the advice so far. I have spent some time trying what you suggest and it appears to have fixed some of the issues. A couple of questions though:

1) Where is the connections to the bumper for the parking and thermometer and can I check/fix that myself easily?

2) The only bit of the locking still not working is the botton on the door handle - any suggestions.


The stuff that fixed the rest of the locking issues was simply using the key in the ignition while driving for a couple of hours. This appeared to recharge/resynch the key so the doors lock and unloack with the remote blipper. Not sure how this also fixed the doors unlocking when I touched them and had the proximity card in my pocket but it did.

 

[television]

It is not permissible to have a number plate holder on cars with parktronic code 220

Incorrectly painted sensor can give false alarms, and actuation of the display.

The fault codes need to be read out, this wil tell you what sensor is faulty.

It is a bumper off job to get to them, less sensitive sensors are available.

The temp sensor is pushed into the front bumper, and pulls out

 

[WCA]

Okay, next time it is in for a service I will get it checked out. I was working for a while and then stopped so I guess it is probably something loose or something that has moved.

I will have a quick poke about to see if anything is obvious but otherwise leave it to the garage.

Thanks for all the help.

 

[television]

Okay, next time it is in for a service I will get it checked out. I was working for a while and then stopped so I guess it is probably something loose or something that has moved.

I will have a quick poke about to see if anything is obvious but otherwise leave it to the garage.

Thanks for all the help.

Hard to say, but as you have the two individual problems both in the same area, something could be disturbed, may be a parking bump, good luck, nice cars.

 

[WCA]

I think it is probably that something may have worked loose. I had to replace the rear tyres so was 'enthusiastic' for a short while to use up the last few mil of rubber ;-)

Amazing what the car can do when you really push it.

 

[WCA]

I think it is probably that something may have worked loose. I had to replace the rear tyres so was 'enthusiastic' for a short while to use up the last few mil of rubber ;-)

Amazing what the car can do when you really push it.