audiovox aps997a, 06 scion xb

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roxxor

Member - Posts: 10

Joined: February 28, 2006

Location: United States

Posted: May 16, 2008 at 2:13 PM / IP Logged

Hi all. I have been installing car audio/video for several years, and this is my first attempt at an alarm install on my wife's 06 Scion xB. After reading the Scion xB wiring diagrams and the Audiovox APS-997a, I mapped out all the wiring and started at it. All my wires for the alarm/remote start are connected and the car starts when I use the key, however I have come across two problems that I am having, and I'm not sure if it's just the wrong wires I'm using or what, hopefully someone can help.

First, The Audiovox instructions list the tach wire for my alarm as the "Tachometer Input Wire" and states that the "wire will be routed to the vehicle ECM tach input or run to the engine compartment and connect to the negative side of the ignition coil." I connected the wire to the black wire at pin 9 going to the ODBII connector and tried the tach learning program for my alarm multiple times, and it still registers as not reading a tach signal. Since all the wires/relays are connected correctly and the car start normally, is there any possibility this could be the incorrect wire? Or is there a different tach wire I could try?

Secondly, I am having trouble with the door lock/unlock. I connected the negative door trigger wire to the RED / white (-), and connected the (-) lock and unlock wires to the correct wires in the wiring diagram to match what is needed for my alarm. However, the alarm will not unlock the doors when they are locked, and the lock sequence locks all the doors, but then automatically unlocks the driver's door again, and will not lock it. Any thoughts on this one, I'm not sure where to begin with it.

Thanks for any input!!

Scott

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Mike M2

Platinum - Posts: 2,652

Joined: June 29, 2005

Location: United States

Posted: May 16, 2008 at 5:45 PM / IP Logged

You always know a Toyota tach wire as they sit alone in a corner of the OBD2 plug(the shorter row of pins but away from the other wires). If the black wire you are getting is like this it is right. It should connect to the GREEN/ orange wire on your alarm. An alternative is to go directly to a coil. It will always be the second wire from the left if you are looking at it from the wires(there are 4 coils). I have never had the OBD2 wire not work tho.

Either you are not trying the locks with the door pin closed(this will make the door unlock after lock) or you have a wiring issue. The lock wires are as follows

Power Lock	blue/white	-	driver kick, 14 pin plug
Notes: Meter this wire while turning the key in the driver door key cylinder.
Power Unlock	yellow/black (double pulse)	-	driver kick, 14 pin plug
Notes: Meter this wire while turning the key in the driver door key cylinder.

Connect the green and RED / black wires together and both to the yellow/black. Go into programming and turn on 2 step unlock. This will give you unlock on the drivers door the first press of the remote and unlock the others on the second.

Mike M2

Tech Manager

CS Dealer Services

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roxxor

Member - Posts: 10

Joined: February 28, 2006

Location: United States

Posted: May 26, 2008 at 3:02 PM / IP Logged

Ok. I was able to get the door problem corrected, however I am still having issues with the system learning the tach. I have tried both the coil wires and the ODBII wire and still cannot get it it read. I am wondering if I am just not able to get the unit into tach learning mode because I cannot access any of my other program modes either. I connected all wires that needed to be connected, but I am wondering if maybe I am missing something?

Thanks again for your help.

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audiovox aps997a, 06 scion xb

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