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Central Locking Frustration


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Car: 2002 C2 cab. Driver side latch was replaced last year as was the front hood latch.

 

Symptoms:

1. Double beep when I try to lock with the key fob, and locks to do not lock.

2. Central locking switch LED on.

3. Unlock possible with key fob.

 

Using Durametric, I get the following codes:

47 - Control locking synchronization

60 - Central locking limit position Lock not reached
61 - Central locking limit position Unlock not reached
 

Here's what I've done so far:

1. Assumed it was the passenger side latch causing an issue and replaced it. No change, so put the old one back.

2. Removed driver's seat and removed and inspected alarm control module (exterior and interior). No water incursion found. Circuit board looks OK: no burns or visible defects.

3. Followed the Bentley and Porsche workshop manual troubleshooting for these error codes (Workshop Manual is far more useful). No issues found.

4. Reviewed the schematics and tested continuity to ground and continuity between driver side and alarm module and passenger side and alarm module. No issues found.

 

Put it all back together and initially it seemed fine. Then it started to repeat the double beep.

 

At this point I'm not sure what to do... I see conflicting information about whether the exterior and interior door handle microswitches will cause a double beep or a single beep. Can anyone advise? I'd rather troubleshoot these than sending off the alarm module, DME and keys for diagnosis, which seems to be the next step according to the Workshop Manual.

 

I now also have an airbag failure light supposedly caused by the driver seatbelt receptacle. Will post separately about this.

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I just changed the battery on my 996, it was dead so i tried all the methods in the manual to jump the system with the connector in the fuse box, no good, all efforts failed.

I then went into the wheel arch and pulled the stainless cable to pop the bonnet.

Changed the battery.

Now, i have the following issues;

Porsche Software Number [I48]
3 Alarm system
    54 Radio reciever faulty
    34 Passenger compartment monitoring sensor
    46 Control locking synchronization
    14 Right door secured, but not locked
    60 Central locking limit position lock not reached
    59 Central locking limit position secure not reached
    10 Voltage failure at terminal 30 with alarm system active
    11 Voltage failure during alarm output
 
I cant erase codes, when i try this happens;
 
    Negative response Key:33
    Press "OK" to Continue OR Stop With Button "CANCEL" !
 
Any suggestions from this point would be appreciated..... I suspect the issue is the module,... if there is one, as before the battery i have never had an issue with the car.
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1 hour ago, Jamesengineering said:

I just changed the battery on my 996, it was dead so i tried all the methods in the manual to jump the system with the connector in the fuse box, no good, all efforts failed.

I then went into the wheel arch and pulled the stainless cable to pop the bonnet.

Changed the battery.

Now, i have the following issues;

Porsche Software Number [I48]
3 Alarm system
    54 Radio reciever faulty
    34 Passenger compartment monitoring sensor
    46 Control locking synchronization
    14 Right door secured, but not locked
    60 Central locking limit position lock not reached
    59 Central locking limit position secure not reached
    10 Voltage failure at terminal 30 with alarm system active
    11 Voltage failure during alarm output
 
I cant erase codes, when i try this happens;
 
    Negative response Key:33
    Press "OK" to Continue OR Stop With Button "CANCEL" !
 
Any suggestions from this point would be appreciated..... I suspect the issue is the module,... if there is one, as before the battery i have never had an issue with the car.

 

:welcomeani:

Most of those codes are from the battery change.

It is best to tell us the exact model and year of your car and what diagnostic tool/software you are using.

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Ok, great.  Thx.  :-)

I am using Autel MaxiDiag Elite tool.

I just tried a few more things, i removed the B8 and C3 fuses and ran diags again, no errors.

so then, put C3 back in, no errors.

then put B8 back in, errors are back. Trying to use power of deduction.

One of the reads i had an abs error thrown up but was able to clear that no problem.

Also just removed the alarm module and inspected it, looks ok, no blown fuses or resistors.

James

NOTE: on the bonnet hood latch, i noticed when i used the cable to pull the latch with no batter, it remained tight and wouldnt spring back to return, i had to do that manually, maybe that is something to do with the issue from Gromit?

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  • 2 weeks later...

Purchased the durametric cable, plugged in, cleared codes.  Car is now running again but I am back to the central locking key not working.  I suspect its related to the last 2 codes I cant get rid of, instrument cluster and tiptronic codes.

I will start to work on them later, just happy to have it running again and I can use it via locking with the key in the door, old school.

Special thanks to Loren and Durametric.  :-)

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