Anti-theft system control signal???

[NefariousVW]

So I attempted to install the AVH-P4400 in my 02 jetta wagon using the metra 70-1784 I got from Enfig. His harness has the turn-on lead (blue) connected to connector III pin 5 (anti-theft system control signal). I noticed that pin is constant +12VDC. It's not the new radio is it's constantly hot even with the new radio unplug. I found this out because I used the blue wire for the parking brake bypass relay which I could hear clicking when connecting or disconnecting the blue lead from the relay. So my question is; Should that pin be a constant 12VDC? If so, why would the amp turn-on lead be connected to it?

[NefariousVW]

Here's a pic of the plug/wire in question. Its the second red/wht wire.

[NefariousVW]

I should also note that everything worked but 1.5hrs after install I tried to start the car and i got nothing but clicking relays and flickering cluster lights which is what caused me to double check my wiring and find the relay constantly energized. My guess is the energized relay drained the battery.

[phukenvr6]

U don't need the blue wires on the metra plug. U hook the relay brake bypass wire to the blue white wire coming from the pioneer harness.


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[NefariousVW]

U don't need the blue wires on the metra plug. U hook the relay brake bypass wire to the blue white wire coming from the pioneer harness.


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After digging through my Bentley manual and researching online I came to the same conclusion and clipped the wire. This is the exact harness I started with from Enfig. I don't know why he has the blue turn-on lead tied to pin5 of the black vw plug but clipping it didn't affect anything so that's how it will stay.

[NFrazier]

The vast majority of VW's past 97 are not supposed to have the blue wires hooked up to anything in the harness (there is an exception but it is not worth mentioning here).

To bypass the e-brake safety you use a relay as such:

Terminals:
85: Remote turn-on from the Pioneer.
86: Ground.
30: Ground.
87: E-Brake wire to the Pioneer.