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Parking Bypass question

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Old 02-26-2013 | 07:49 PM
  #11  
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So, there are a couple of ways to wire up a parking brake bypass for a Pioneer. For other decks, you can just directly ground the wire (most of the time), but Pioneer sees a constant ground on power up and locks you out of video this way:

1) A switch.

- Wire the green parking brake wire from your aftermarket headunit to a toggle switch, and the other end to a ground. Switch on after the vehicle is on.

2) A relay.

- This method is a little more complicated than a switch, but requires no input from you. Let me start this out with an explanation of a relay if you are unaware. If you are, skip this.

What you are going to use is a SPDT relay. There are 5 terminals on a SPDT Bosch relay, 85, 86, 30, 87 and 87a. 85 and 86 are the coil terminals, 30 is a common terminal, 87 is normally open, and 87a is normally closed. In a SPDT relay at rest, terminals 30 and 87a are in contact. When current flows between 85 and 86 the relay engages and terminals 30 and 87 are now in contact.

So, how to wire it. There are multiple ways, but the easiest is going to be to wire it to the blue/white amp turn on wire coming out of the stereo wiring harness. Run the stereo side of the blue/white to 85, with 86 running to your amplifier, or a ground. Terminal 30 will be running to a ground, 87a will not be connected to anything, and 87 will be connected to your green parking brake wire.

When the stereo turns on, the blue/white wire will be active with 12v, and cause the relay to click over the contacts.

3) Normally Closed Momentary Switch

You could buy a normally closed momentary switch. When the stereo turns on it will see the ground and you will be unable to see video. Push the button and the ground is broken, then it reconnected when you let go. Video works.

Choose and perish!
Old 02-27-2013 | 07:37 AM
  #12  
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Aideon pretty much covers the best ways to do it. I personally would combine the automatic parking brake faking relay with a switch on it's input so I can disable it as you want. Wire the switch to break the remote connection to the relay and the relay will release.

The reason for the relay is Pioneer got smart with always grounded setups, so it waits to sense the change after power is applied. Hooking your relay to the blue remote output gives it sufficient delay to trick the radio.

Obligatory note: Watching videos yourself while driving is still highly illegal and dangerous, I take the assumption you intend for passengers to watch the video :p
Old 02-27-2013 | 06:03 PM
  #13  
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Demp is correct on that. I *do not* do parking brake bypasses at work for that exact reason, and adding one voids our labor warranty. In most states it is illegal for the driver to be able to view video while the vehicle is in motion. Use my instructions how you will, but if you drive into a ditch and get stuck, I'm not coming to pull you out!
Old 02-27-2013 | 06:15 PM
  #14  
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Most people I know do the bypasses for Nav use and not for video.
Old 03-01-2013 | 07:58 AM
  #15  
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When I did it on my TJ with the Pioneer headunit I didn't have nav, but I did have bluetooth. While in motion I couldn't even use it to call out, which prompted the bypass. I find it Ironic that doing the bypass for that use made it safer for me to drive compared to digging out my phone and dialing then telling it to go to bluetooth.......




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