Something or Nothing?
Thread Starter
Racer
Joined: Jun 2003
Posts: 433
Likes: 0
From: Aspenden Hertfordshire U.K.
Something or Nothing?
Quick question on auto door locking after start up, are the door locks supposed to engage each time you start the motor and move off? reason for asking is sometimes mine lock every time but then sometimes decide not to bother for the rest of the day, but Ok again on start up next day.
Is the controle module for the locks in the trunk just above the LH wheel? there is a black plastic box there which seems to be very lose fitting, is that normal?
The car is a 2001 Euro Spec coupe, however I noted after changing tyres recently the TPMS are the early type so presumably the control module wil be different also?as I believe its the same module for TPMS and door locks etc?
Thanks
Mike.
Is the controle module for the locks in the trunk just above the LH wheel? there is a black plastic box there which seems to be very lose fitting, is that normal?
The car is a 2001 Euro Spec coupe, however I noted after changing tyres recently the TPMS are the early type so presumably the control module wil be different also?as I believe its the same module for TPMS and door locks etc?
Thanks
Mike.
Thread Starter
Racer
Joined: Jun 2003
Posts: 433
Likes: 0
From: Aspenden Hertfordshire U.K.
Still need to know if the door locks should engage automatically after start up?
I did pull some codes last year which suggest there is or has been a problem with communication from both doors to the RFA so probably not a new issue just want to know if I need to worry or a way of fixing?
Codes Pulled
AO LDCM B2282/B2284/B2278 U1064/U1096
A1 RDCM B2283/B2285 U1064/U1096
BO RFA U1096/U1064/U1016 C2105/C2120
Is the RFA the small black box above the left wheel in the trunk? and if so should it be fixed tightly as mine seems very loose? where does this unit run to earth is it G401 or G301? or somewhere else?
Some advice please.
I did pull some codes last year which suggest there is or has been a problem with communication from both doors to the RFA so probably not a new issue just want to know if I need to worry or a way of fixing?
Codes Pulled
AO LDCM B2282/B2284/B2278 U1064/U1096
A1 RDCM B2283/B2285 U1064/U1096
BO RFA U1096/U1064/U1016 C2105/C2120
Is the RFA the small black box above the left wheel in the trunk? and if so should it be fixed tightly as mine seems very loose? where does this unit run to earth is it G401 or G301? or somewhere else?
Some advice please.
Race Director
Joined: Jan 2006
Posts: 10,554
Likes: 33
From: Not on either liberal coast.
Do you have an owners manual? If not, download one for free courtesy of GMPARTSHOUSE... http://www.gmpartshouse.com/. It might give you some help.
Read Section2: Features and Controls. Read through that entire section, specifically Section 2-101 on how to Auto Lock and Auto Unlock. You change the settings in the DIC to your preference.
Read Section2: Features and Controls. Read through that entire section, specifically Section 2-101 on how to Auto Lock and Auto Unlock. You change the settings in the DIC to your preference.
Team Owner
Joined: Jul 2006
Posts: 22,150
Likes: 4,165
From: Kannapolis NC
The RFA is the box behind the driver's seat that you are talking about. The purpose is to receive the signals from the TPMS and FOB. It doesn't communicate directly with the door locks or cause the lock or unlock. It only receives the signal and sends it on to the correct module. (I think it's the PCM and that commands the door control module, but I don't want to tell you the wrong destination for the RFA.)
The fact that is loose will not cause what you are seeing. The auto lock/unlock has nothing to do with the RFA.
The fact that is loose will not cause what you are seeing. The auto lock/unlock has nothing to do with the RFA.
Thread Starter
Racer
Joined: Jun 2003
Posts: 433
Likes: 0
From: Aspenden Hertfordshire U.K.
Yes I have an owners manual and appreciate you can set the auto door locking, but what I am seeing is intermittant, sometimes the doors lock each and every time I restart the car, then another day they will lock first time only and then not for the rest of the day, but I will try and reset the system to see if that works.
Cheers
Mike.
Cheers
Mike.
Racer
Joined: Apr 2009
Posts: 488
Likes: 2
From: Myrtle Beach SC
The lock/unlock ACTION is carried out by the respective door control module (DCM). When another module sends the signal (such as to unlock when the key is removed from the ignition), that signal is transmitted across the serial data (SDL) system. The same holds true for using your key fob...the command goes from the RFA receiver to the DCM via the SDL.
An intermittent malfunction of your door locks suggests a communication issue.
I would look at the serial data wire that goes into the doors via the accordion tubes. Check the connector and ensure the tabs are not bent out of shape, causing a loose connection. You can fix such an issue with a small screwdriver or pick...but be careful not to damage the tabs.
Hope this helps...good luck.
An intermittent malfunction of your door locks suggests a communication issue.
I would look at the serial data wire that goes into the doors via the accordion tubes. Check the connector and ensure the tabs are not bent out of shape, causing a loose connection. You can fix such an issue with a small screwdriver or pick...but be careful not to damage the tabs.
Hope this helps...good luck.
Drifting
Joined: Mar 2010
Posts: 1,628
Likes: 15
From: Seattle WA
His codes show multiple communication failures. OP, you need to check the wiring harness inside the door accordions. There are two connectors inside, one for the DCM and one for the speaker; the DCM module tends to get kind of beat up, take a look at it and see if you can find a bent female pin or other bad connection. Sometimes just wiggling the accordion is all it takes to show the problem.
Thread Starter
Racer
Joined: Jun 2003
Posts: 433
Likes: 0
From: Aspenden Hertfordshire U.K.
I will check the connectors as reccomended, but the communication codes were history codes and go back to when i had problems with the after market alarm and was pulling fuses, disconnecting the battery etc. turned out to be the alarm siren being faulty and drawing 200ma at rest, but all sorted now.
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Drifting
Joined: Mar 2010
Posts: 1,628
Likes: 15
From: Seattle WA
Reset the codes and see if any of them come back, then. I try and reset any code after I think I have a problem 'solved' so I can verify it easily.
Intermittent problems will show as history except when they're causing problems, and sometimes they won't even show current then. That's part of the hassle with troubleshooting them.
Intermittent problems will show as history except when they're causing problems, and sometimes they won't even show current then. That's part of the hassle with troubleshooting them.
Thread Starter
Racer
Joined: Jun 2003
Posts: 433
Likes: 0
From: Aspenden Hertfordshire U.K.
Finally got round to resetting all of my codes plus checked the door lock seetting on the DIC, it was set to the "OFF" position so even more worrying now why the doors still auto lock on occasions, I have alternated the setting a couple of times and will see how that affects it, but I suspect this may be a Euro spec phenomonon combined with the after market alarm, I know with the C6 that if you try to install a euro alarm it drives the electrics crazy so people keep well away, perhaps the C5 has similar issues but to a lesser degree?
Anyway will leave the door locking alone for now and concentrate on fitting some new batteries to my TPMs, oh what fun it is to own a C5.
Anyway will leave the door locking alone for now and concentrate on fitting some new batteries to my TPMs, oh what fun it is to own a C5.