2005 monte carlo door locks

I am installing a Viper 791 in a 2005 Monte Carlo. I have everything hooked up and working minus the power door locks. According to the wiring diagram the ORANGE / black wire at the PCM controls the door locks. If a straight negative pulse is sent the doors are unlocked. If a negative pulse is sent through a 470ohm resistor, the doors are locked. I have the ORANGE / black wire t-tapped once and have both the unlock (straight -) and the lock (wired up with 470 ohm resistor) connected into the ORANGE / black wire. However, the doors will only unlock. They will lock when the unlock wire is disconnected so I know the resistor is wired correctly, but for some reason when both the lock and unlock wires are present only the unlock works. Any ideas on how to get this wired up?

I looked through the examples on here and found a dodge caravan that required a negative pulse through a resistor for both unlock and lock and that appears to be wired up the same way as mine, only my setup isn't working. Thanks!

This is an LS model Monte Carlo. Forgot to add that to the above info.

Not real familiar with the Viper 791 but I see from the install guide that it does (-) / (+) pulses from the lock outputs...   Diodes might work or

Have you tried using relays as per the top diagram on this link ?   https://www.bulldogsecurity.com/diagrams/extrainfo/diagrams/14301_MONTE-CARLO_MONTE%20CARLO%201%20WIRE%20JBS%20UNITS.pdf

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Soldering is fun!

Thanks, kreg, I'll give that a shot. What a pain in the ass...two relays! I bought the XK01 hoping that it would do door triggers, trunk release, PASSLOCK bypass and door unlock/lock all over the data bus...that didn't work looks like this is going to be a much more time consuming way.

The 791 with flip flop lock outputs won't have enough current to fire past the resistor.
Use a DEI 451 module or a pair of relays (which gets rid of the need for diodes)
Take the relay lock out put and wire in the resistor, then join to the unlock output then to the vehicle wire and by the way don't T tap, solder. Your probably losing half the current that way.

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Amateurs assume, don't test and have problems; pros test first. I am not a free install service.
Read the installation manual, do a search here or online for your vehicle wiring before posting.

You can try this, usually works.  470 Ohm resistor on the lock wire (green)  and a diode on the (blue) unlock wire, band towards the 791module.  Then connect that to the Org/Blk wire.   Old trick for malibus, grand ams, ETC.

Mark, you will still need relays both sides, the 791 output isn't strong enough to overcome the resistance, in fact directwire for that car says use relays, I've had to on Euro VWs which use a similar mux system. Once you use relays you won't need any diodes.

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Amateurs assume, don't test and have problems; pros test first. I am not a free install service.
Read the installation manual, do a search here or online for your vehicle wiring before posting.

I worked on an '04 Monte Carlo not long ago. It required 2 relays and a resistor for the lock.

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OK.

Directwire says that "needs relays" for the Malibus, MonteCarlos...  etc.   and it works on them.  Maybe not the Org/Blk vehicles. 

Chris Luongo turned me onto that trick in the DEI froum way back, and I've used it many times.

Mark, much as I wouldn't argue with you and Chris, two of the Gods of this business there's an easy test to prove or disprove what I say:-
If our original poster simply runs the two leads, one with the resistor and the plain lead back to ground one at sat time with either the driver's door shut or the lock catch thrown over it should work the locks.
The poster then makes sure the 791 is putting out a neg each time.
If so relays are required.



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Amateurs assume, don't test and have problems; pros test first. I am not a free install service.
Read the installation manual, do a search here or online for your vehicle wiring before posting.

I am not a god!  Somewhat kknowledgable, yeah, maybe.  But GOD, no.  (thank you anyway)

But you're right Howie, just a resistor and a diode.

I did 160XV's 791"s,  ETC, they were all the same..

I still do this on the single (White) wire GMs, (cobalt etc).  at the pass side BCM,

I'm being silly, if you've done it and it works, fine, sorry Mark.

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Amateurs assume, don't test and have problems; pros test first. I am not a free install service.
Read the installation manual, do a search here or online for your vehicle wiring before posting.

Mark Mizenko wrote:

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You can try this, usually works.  470 Ohm resistor on the lock wire (green)  and a diode on the (blue) unlock wire, band towards the 791module.  Then connect that to the Org/Blk wire.   Old trick for malibus, grand ams, ETC.

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I'll give this a shot! Thank ya sir!

Quick question....did you have a problem with the door triggers and/or trunk trigger? I have a problem with the alarm going off after exactly 10 mins. I think its the BCM shutting down. Im gonna wire in relays for it...see if it helps. And I worked on an '04 Monte Carlo.

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Mark Mizenko wrote:
You can try this, usually works. 470 Ohm resistor on the lock wire (green) and a diode on the (blue) unlock wire, band towards the 791module. Then connect that to the Org/Blk wire.   Old trick for malibus, grand ams, ETC.

Mark, This worked amazingly....thank you thank you thank you!

godd dan it wrote:

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Quick question....did you have a problem with the door triggers and/or trunk trigger? I have a problem with the alarm going off after exactly 10 mins. I think its the BCM shutting down. Im gonna wire in relays for it...see if it helps. And I worked on an '04 Monte Carlo.

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I am having a problem with the driver's door triggering alarm, but not the passenger door...any ideas?

godd dan it wrote:

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Quick question....did you have a problem with the door triggers and/or trunk trigger? I have a problem with the alarm going off after exactly 10 mins. I think its the BCM shutting down. Im gonna wire in relays for it...see if it helps. And I worked on an '04 Monte Carlo.

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I am having a problem with the driver's door triggering alarm, but not the passenger door...any ideas?[/QUOTE]

What do you mean by triggering? The alarm goes off after a certain period of time? Or do you mean the passenger door doesnt work at all?

First thing, there is 2 different door triggers (one for the driver's, and one for the passenger's door). You need to diode isolate both door triggers. Did you do that? I did that, but im still having problems. So thats why im going to keep the diodes in and wire in relays. There's actually a wiring diagram for it.

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OK I bow to your knowledge oh great Guru, bet you wouldn't have touched one I was given the other day, front end conversion of a 2000 M/B SL 5.0 to 2010 spec.
Just think 2 x new fuseboxes with processors, extra looms, HID, CAN, self levelling etc. Even the plugs were different!
Ref. the question about 10 minute triggering, refer to DEI 1076, it's somewhere on this site.

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Amateurs assume, don't test and have problems; pros test first. I am not a free install service.
Read the installation manual, do a search here or online for your vehicle wiring before posting.

You're right Howie, I would'nt have wanted that one.  Sounds like it was a project.  Everything work out allright?  (i know the answer to that by the way).  You dont get 5000 posts by being wrong.  Stop bowing.

Godd.... like Howie said Doc 1076.   You NEED this.

I ran away from it, confident that no one would touch it! The trick is to know what's do-able.
So first I lay out $7000 for a Bosch full on diagnostics kit but it's still go to go to a dealer to have the lights turned on etc etc. one of the many reasons M/Benz and VW/Audi have been losing ground to Kia Lexus etc.
DEI have bought out CAN only alarms, working off the OEM remote for all the latest Euro Cars, you simply flash it with the right software, I refuse to use anything else on post 02 Audis for instance.

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Amateurs assume, don't test and have problems; pros test first. I am not a free install service.
Read the installation manual, do a search here or online for your vehicle wiring before posting.

Mark Mizenko wrote:

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Godd.... like Howie said Doc 1076.   You NEED this.

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Ok thanks and thanks Howie. I really hate working on these GM cars. Now I have to post a new topic about a Cadillac I worked on.

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godd dan it wrote:

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What do you mean by triggering? The alarm goes off after a certain period of time? Or do you mean the passenger door doesnt work at all?
First thing, there is 2 different door triggers (one for the driver's, and one for the passenger's door). You need to diode isolate both door triggers. Did you do that? I did that, but im still having problems. So thats why im going to keep the diodes in and wire in relays. There's actually a wiring diagram for it.

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Triggering meaning when the system is armed and I manually unlock the drivers door and open the door it sets the alarm off (like its supposed to). However, when I arm the system and manually unlock the passenger door and open it the alarm doesn't go off. I did diode isolate BOTH door triggers (band on diode facing towards car), but the passenger door still doesn't work. Suggest relay for the passenger door? Thanks!

No, meter the alarm to see if it responds when the passenger door is opened, i.e set meter to low ohms or continuity buzzer, one probe to either the ECU that correct wire goes to other probe to the door trigger terminal or wire on your unit (green wire). Then open that door.If open circuit you've made a mistake.
Then to double check place one probe end to a good ground, other end to the same green wire.
Again should go to ground when door opens.
You will NOT need a relay.

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Amateurs assume, don't test and have problems; pros test first. I am not a free install service.
Read the installation manual, do a search here or online for your vehicle wiring before posting.

Actually, reverse the order of the above tests,
The first tells you if the factory switch is O.K.
the second tells you if your wiring is O.K.

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Amateurs assume, don't test and have problems; pros test first. I am not a free install service.
Read the installation manual, do a search here or online for your vehicle wiring before posting.