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Remotely Open Sliding Doors With No Relays

5951 Views 6 Replies 5 Participants Last post by  xenon2000
Wanted to post my latest Odyssey project in hopes of helping someone wanting more options. I found several diagrams for controlling the power sliding doors using an aftermarket remote, but they all involved several relays and some timing modules. They all basically used the same wirings that are located at the back of the rocker switches on the dash but in slightly different ways. I did not like any of these solutions and came up with my own. My thought was I would use the same logic that the factory keyless module uses to trigger the door to open and close.

I started the project by reverse engineering the way the factory keyless worked and it turned out that it was a little more complex than just grounding a wire. I connected a logic analyzer to the wire from the factory keyless and got a two pulses of 0.3 seconds on time and 0.06 seconds off time. I attached an output of this diagram where channel 1 is the Grn/Blu wire that triggers the door and channel 2 is the Grn/Org wire that gives the status of when the door is in motion.

To recreate these 2 pulses I designed a circuit that uses two 555 timers. The first timer(U1) is a monostable and will turn on the second timer(U2) on when power is applied. The first timer is just long enough to only let 2 pulses out of the second timer. The second timer is an astable. The PNP transistor(Q1) is important because it will only apply power to the timers when grounded for the duration of the 2 pulse cycle. This design characteristic gives approximately no current draw when off. It only draws current(<20mA) when timing.

It is important if you make this circuit you may need to change the values of R2 and C1 if they do not work for you. There are many variables and I had to tweak these last minute after I finished. If set properly you should only get 2 full pulses. You can clearly see this with the LED connected on the output which is an excellent debug feature.

One limitation of this design is it only allows my one AUX output to control both doors. I have made a compromise just before I finished and added a switch that allows either door or both to be selected. I have it set to driver side door now and when more kids come along I will set to both doors. Keep in mind if your remote has multiple AUX outputs you can build two of these circuits and have full control.

For the connections you will need to find a Grn/Blu wire for the driver's side door and a Grn/Blk wire for the passenger's side door. You need to monitor the voltage on these with a DMM to watch if the voltage goes to 0V when you operate the door. The door lock wires share these colors and are on the same harness.

Hopefully someone else out there would also like to have a solid state design like this and try it themselves. I would be happy to answer any questions.

Application should be for 1999-2004 EX models.


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Also in 2002, the Ody had an interior lights timeout feature if a door was left open. IIRC batteries were drained because someone left a reading light switched on. The timeout would not turn off the light in this case. So it would run until the battery was dead.

One solution is to always turn the master interior light switch to off after a drive. Also, switch to LED lights as mentioned by wreckedGT. They run cooler and consume 1/10 the power, so the battery may still be alive when you return to the van.
I know this is an old thread and there are other threads on this subject. But this is the one I found in my search that I want to reply to.

I have to keep my master switch in the off position because mostly other people's kids will mess with the map lights during the day. And I don't notice them as they are normally on with the doors open and I don't look at them when the doors are shut. So our van has been dead 3 times now in 1 year because of this silly design flaw.

My 2001 Grand Am will cut power to the ENTIRE car after 15 mins if the key is not in the ignition. Which is great. My Grand Am has auto headlights so that is nice. But even if I turned them on manually, left map lights on, glove box open, truck open, etc. Anything. If the key is out, then power is shutoff to everything in 15 mins. So I have never had a dead battery on that car due to lights being left on.

So I am pretty shocked my 2003 Ody doesn't have this simply feature and no auto headlights. And no glove box light. lol.

It's pretty lame not having the master light switch left in the "door" position. So at night I have to turn that on manually and turn it off manually as my new habit to make sure we don't have dead van.

And yes, I should swap to LED lights no matter what.

Now, to leave an on-topic comment as well. Thank you so much for a great solid state design for the power doors. I had totally forgotten about the remote doors on my 2003 Ody, now that I am thinking of installing a 2 way remote start alarm that I have had sitting around for years. Guessing I won't be able to just keep using the stock remote for doors only. lol.
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