Alarm not unlocking doors?

Hello everyone , well like the title says , my alarm isn’t unlocking my doors anymore . I have to disengage the alarm THEN unlock my doors manually . Anyone know what could be the issue or where I can Start looking? Thanks in advance !

 

Factory/OEM alarm, or aftermarket alarm?

If you say "factory/OEM", are you 100% positive no previous owner installed an alarm - i.e. no extra wiring under the driver's side dash, in the driver side kick panel, and/or no mysterious black or blue colored electrical boxes under the driver side dash, around the steering column, etc.?

Are you using a factory/OEM fob? If yes, have you tried changing your battery, in case maybe it's low?

 

Also, when you recently swapped over to the new Sequoia engine because your old engine was 'seized', did you move over any harnesses or ECU from the donor vehicle? Did the fob ever work to unlock after the swap? Do the door lock controls on the door cards work on both sides of the vehicle?

 

It’s aftermarket ! Sorry for now specifying , this issue was before my engine took a crap on me . I had a shop do the swap for me though. The fob worked for a couple months unlocking the doors. Yes ALL door controls work to lock and unlock the truck . Could it be a fuse ?

 

With all the 'smoking battery' details you provided from the engine-seize post, that sounds sketchy.

You should have the RS3200 system in your truck, the instructions for programming it are here if you wanted to fiddle with it.

If the system is chirping when you use the buttons on the fob (it is, right?), it means the RS3200 system is recognizing the remote control, receiving its signal, and disarming the unit as it should. This would suggest the core of the RS3200 system is functioning, just not the door lock trigger.

Likewise, if the door lock controls on the armrests are operating as expected, unlocking/locking the doors, there's no problem with the actuators in the doors, and that system is functioning as it should.

The RS3200 system should be using the same wires to energize the door lock actuators as the door controls do, Toyota didn't run separate wires for the system. It sort of limits the field of possible problems, you'd think:

1. A problem with the fob (got a spare to test?),
2. A problem with the RS3200 system failing (I assume it has a controller like the older RS3000 system, maybe you have a water leak, maybe from the prior accident you suspect and the control box took on water?),
3. A problem with the wiring to/from the RS3200 system, either the the signal wire it uses to trigger door locks got pinched, or if it uses one, maybe an electronic relay for the RS3200 box uses to trip the doors has fried? (I'm not aware of any relays used for it, this is just a wild guess)
4. A problem of previous-owner-hackery into the system, like this guy found in his doors, where someone previously had an aftermarket alarm, and left all the aftermarket relays wired in, and it eventually glitched his system.
5. It's possible a fuse is blown, I suppose, but ... that would've been the 1st thing I checked.

I dunno man.. not sure what to tell you on how to move forward. I'd need to dig hard on RE3200 to figure out where the brain box is located, check the wire pinouts, etc. But I got way too much going on today for that.

 

Im gonna start with replacing the remote fob , the fob engaged my alarm and now I can’t disengage it and i just replaced the batteries . I need to go to work so I removed the fuses for now .

 

It's entirely possible the TVIP brain shit itself, also.

I checked the FSM, and it appears the brain/ECU for RS3200 ("TVIP") system is in the dash, between the steering column and radio. It's not clear to me exactly where it is, but there's only three parts I see, the ECU (black box) itself, the wiring harness, and the (optional) glass break sensor that some people have in the dash. But the FSM says "except Double Cab", suggesting maybe things are different for DC trucks.

For diagnostics, it's saying it needs to go to diagnostics page "DI-2317" for details on troubleshooting the system. This is the first time I've seen or read this happening to anyone and I'm not finding anything else on the internet.

I would probably try and program in another fob as a troubleshooting step. I have 2 spare fobs in case the one I regularly use dies. Easy for me to say, right?

 

I’ll try the replacing the fob route ! Thanks bro ! I have lots of other questions about this lovely truck gonna search through the forums first !

 

@Marco05Tundy a lot of your questions are potentially already answered here: https://www.tundras.com/threads/so-you-wanna-buy-just-bought-a-1st-gen-tundra-eh.115928/