View Full Version : Electrical phenom in the 80 - door locks

10-13-2011, 10:11 AM
I installed a new head unit in my 80 a couple weeks ago, and since the install I've got a couple of new and different behaviors related to my door locks.

1. When I start the truck and put it in gear to back out, the doors lock automatically. When I put it back in park after reaching my destination, the doors unlock.

2. When I use my key fob to lock the doors, they don't lock. The mechanism is activated (I can hear it), but the doors stay unlocked. If I use the switch on the door to lock the doors, they all lock just fine. When I use the fob to unlock the doors, it always works fine.

I don't remember #1 above being functional before I changed head units. Is the auto lock/unlock a feature I uncovered somehow? For #2, I'm wondering if there is a special sensing device for locking the doors via remote that might be failing somehow?

Regarding my head unit install, there wasn't anything crazy or weird for the wiring. I used an after market wire harness that I wired to the head unit wires, and then this harness plugs into the two OEM connectors behind the dash that bypass the factory amp. So I'm using a different harness then what the factory radio used, but still using the factory wiring that exists in the truck. I also spliced into the reverse sensor wire for the backup cam, but that's about it.

Any of you 80 guys seen this or know what's going on?

10-13-2011, 08:14 PM
I chased gremlins for a while. Turned out to be speakers connected to my Alpine unit must not have their frames grounded to body. Cheeseman helped me there. This one I don't get.

10-13-2011, 09:48 PM
yes i belive that the auto lock is factory, its a setting in the body computer. that you can turn on and off. the key fob might be a bad ground or low voltage.

10-14-2011, 12:45 PM
So if I have a key fob, does that imply that I have the factory alarm? I have no dash indicator for the factory Toyota alarm, but someone on Mud is implying that having a fob = having an alarm?

Here's what I have:

10-14-2011, 01:13 PM
That is a key fob.

10-14-2011, 01:13 PM

10-14-2011, 01:59 PM
On my '98 4Runner, that's a key fob for unlocking the doors, and alarm arming device.

Also, if you hold the top button for 3 seconds (or any other random amount of time longer than that required to unlock the doors), the #@$&*$ panic alarm goes off. Any company (Toyota) that integrates the panic alarm button with the door unlock button should be shot.

10-14-2011, 02:07 PM
And I've never figured out what the other button is for. I have the same one on my 2000 Tundra.

10-14-2011, 03:28 PM
I have an aftermarket alarm (Karr) and my locking behavior is just as you describe. Though on #2 it wasn't always like that, pushing the fob used to lock the doors, but now it doesn't lock the doors and instead just sets the alarm. Pushing it again both unlocks the doors and turns the alarm off. I rarely use the thing though, both trucks.. I just stick the key in the door.

10-14-2011, 04:46 PM
The auto lock is a setting in the alarm control unit under the driver seat. I can send you an operating/program manual if you can't find it online.

The not locking thing is a bit odd. Are the speakers grounded with the new head unit?

The second button on the key fob can be programmed just like the top one. I assume is was so you could use the same fob for two different cars. I setup mine to use the bottom button rather than the top to see if it would reduce the random panic alarms. It didn't help - I think the buttons are being pushed and held while the thing is in my pocket. It may also explain some occasionally short lived fob batteries.

10-14-2011, 11:23 PM
that looks to me like its just a keyless entry fob.. but yes it is a fob... :lmao:

10-15-2011, 09:03 AM
Thanks for the multiple confirmations that I do indeed have a key fob. :beer:

I installed new speakers months ago and they worked fine with the old head unit. Wiring had a + and a - wire for each speaker and the sound was fine. The speakers still sound fine in the new unit - no crackling or other strange noises.

I found Peter Parks' write up on the RS3000 on the 'net, so I'll give reprogramming the fob a shot and see if I can get the lock action back on track.

10-15-2011, 09:46 AM
That is a key fob.

I agree 100% with Marco... I am sure of it. :thumb:

10-19-2011, 06:34 PM

Where is your alarm control unit? Under the driver's seat or elsewhere? There was no "Factory" alarm in an 80 as I understand it as they were all installed once they arrived here (as I've read anyway). The most common one has the control unit under the driver's side seat.

On both my LX and the 80 I have what most people would call the "factory" alarms and use the fob like you show (although the LX one is different).

On the LX and the 80, typically when you start the truck the locks will lock. When you shut off the truck the doors will unlock. I say typically because if you get in the truck, start it, then drive to the mailbox and manually unlock the door, drop off the mail (not turning off the truck), and then drive somewhere and shut off the truck the doors won't automatically unlock. Also, if you get to your destination and someone unlocks their door before you shut the truck off again the doors won't unlock when you turn off the truck...Annoys the he!! out of me :hill:

Neither my LX or the 80 have ever locked/unlocked the doors based on shifting out of or into park...only when starting or shutting the truck off so my guess if you have a different alarm system?

Reading through the fob programming instructions I don't ever recall seeing it as an option to have the doors lock/unlock with the shifter position. You can set the beep to on/off, and some other stuff I can't remember.

Oh, and the 2nd button (bottom) on the remote? For both my LX and the 80 those are programmed to the other truck. Unlike most fobs where one button locks the doors and the other unlocks the doors, on mine the top button locks and unlocks. The bottom button is used to program another security system. So my one fob will lock/unlock my LX with the top button and the bottom button will lock/unlock my 80. Comes in handy actually. I set up the 80's fob so the bottom button unlocks the LX.

10-19-2011, 11:03 PM
That was my mistake Jeff - when I originally posted I couldn't remember exactly when it happened. They do indeed lock/unlock when I start/stop the motor. It's just odd that they never did this before I put in the new head unit. Although I've pulled the negative battery cable many times, my latest theory is that having the battery disconnected for a day led to a sort of "system reset" on the alarm system (which is under my seat - I did some digging and found it). I guess I don't mind the lock/unlock behavior, but I wish I knew why I lost the ability to lock the doors with the fob. I haven't reprogrammed it yet, so that's something I'll try when I run out of other things to do.

10-20-2011, 06:51 AM
Have you put a battery in the fob recently? Maybe the old one is getting weak. Have you done the mod to extend the antenna wire? It greatly increases the sensitivity (range) of the system.

10-20-2011, 01:20 PM
Got ya Matt

Not sure if you want to read these threads but here are some helpful threads I had bookmarked on MUD from long ago...Not sure if you have the programming etc. instructions but if not here is a link to them on Slee's site :thumb:

Need new remote (FOB)" thread for FAQ (http://forum.ih8mud.com/80-series-tech/177791-developing-need-new-remote-fob-thread-faq.html)

Alarm remote quetions (http://forum.ih8mud.com/80-series-tech/34469-alarm-remote-quetions.html)

Factory glass break sensor (http://forum.ih8mud.com/80-series-tech/204957-factory-glass-break-sensor.html)

Grey wire mod (extend alarm remote range) (http://forum.ih8mud.com/80-series-tech/233963-grey-wire-mod-extend-alarm-remote-range.html)

Link to RS3000 Alarm Manual (http://www.sleeoffroad.com/technical/tz_alarm_manual.htm) on Slee's website

Programming instructions begin on page 19 of the Owners Guide - page 22 covers enabling/disabling the automatic door locking/unlocking function.

I'm with you that this was disabled in the past and reset to the factory default (automatic locking/unlocking = on) due to the extended time the battery was disconnected.

Not sure why the fob stopped working other than possibly that due to the length of time the battery was disconnected that the system also forgot the fob and you just need to reprogram it. Super simple, 5 min or less job. Only tricky part for you might be the fact that you mentioned you don't have the Toyota status monitor dealyo for the indicator.

12-14-2015, 12:45 PM
So after 4 solid years of service, my Kenwood head unit died when I pulled the battery the other week to fix my alternator bracket. :rolleyes:

Lucky for me, I hung on to the original head unit and reinstalled it. Low and behold, the lock/unlock via the key fob returned to "normal", and I can now lock my doors again with the clicker.

So obviously there is a correlation between the factory stereo and the security/lock/unlock operations. With so many people upgrading their stereos, I'm surprised I wasn't able to find more people having this same issue. I was never able to reprogram the system and get it to work.

As you 80 owners know, there are two wire harnesses behind the dash for the stereo hook up. The single plug is used for the standard US-spec 80 with amplifier. And there is a second pair of plugs that (I believe) bypass the amp and are used in different markets of for a different install. I had my Kenwood plugged into the secondary pair of plugs - so I wonder if that's the problem? Without plugging a stereo through the "primary" wire plug, I'm bypassing so signals to the RS3000 unit and giving it some sort of fault that is causing the behavior?

Anyone dug into this issue, or had similar issues with an aftermarket radio?

12-14-2015, 01:50 PM
My Scion unit is on the second set of plugs and the door lock function in my 80 (RS3000) works fine.

On a somewhat unrelated topic, I replaced my steering with one out of an LS400. The leather was in better condition. It also came with a switch mounted to the left side of the wheel that was originally used for cell phone control in the LS400. It plugged into the factory harness in the 80. I was kinda hoping that I might gain some remote function of the Scion stereo since both devices plugged into the factory harness. But no such luck, I've got 4 buttons that do nothing besides looking odd in an 80.

12-14-2015, 07:49 PM
Glad this thread was revived! I'm really curious about the grounding of the speakers...how exactly do you ground the speakers? This may solve one of my problems as well! I also use the other wiring harness and bypass the amp, but I never grounded my new speakers and I have blown several Kenwood head units ( under warranty). Kenwood stereos are very sensitive to power spikes. My JvC has been in for quite some time without issue, but I really thing I need help to ground the speakers!

Matt...for about the price of a regular remote key fob, I was able to add remote start and get rid of the crappy Toyota key fob. So glad I did that and got rid of the factory alarm crap. The Clifford or alpine (can't remember which) has been awesome and I've never had a problem with it since install about six years ago. Added benefit is that I start my truck from my bedroom window and all the ice is off of it by the time I go outside!

12-14-2015, 08:17 PM
After my Kenwood install everything worked as it should. Auto lock and unlock by engaging transmission into gear. Truck still rejects manual locking if key in ignition (idiot proofing). And the fab worked for years as it should but has been getting temperamental in age. I've pretty much trained myself now to lock manually, well with the door switch. (not each door manually)

I used the primary wiring harness so the OEM amps are still powering the speakers. Crutchfield supplied me a plug and play harness.

I always meant to bypass and remove the OEM amps but never found the motivation. Its not like increasing the sound quality of the stereo was going to drown out all the road noise of a lifted 80 on MT's spinning the crank at 4500 RPM up the mountain :hill:

12-14-2015, 09:10 PM
Its not like increasing the sound quality of the stereo was going to drown out all the road noise of a lifted 80 on MT's spinning the crank at 4500 RPM up the mountain :hill:

So true, Corbet! Unless your in Treeroot's ptarmigan, stereos in lifted 80s on MTs are only impressive at stoplights!