Grounding the parking brake? - Toyota RAV4 Forums
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#1 (permalink) Old 01-08-2012, 09:00 AM
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Grounding the parking brake?

Hey all, my GPS needs to tap into the parking brake and VSS so it can tell when the parking brake is on for safety reasons. There are lots of bypass kits on eBay, I'm just not sure if they are safe to use and where in fact they actually tap into (location-wise)

Does anyone have any information on this? My current unit plugs into the factory locations and when I apply the parking brake it thinks the brake is off. Am I missing something? Is there any easy fix for this?

This is what I'm seeing on eBay, where does it plug into? Back of the radio? Kickpanel?

ECLIPSE VIDEO BYPASS AVN7000 AVN20D AVN4430 AVN30D | eBay

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#2 (permalink) Old 01-08-2012, 09:15 AM
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Please explain to me because i do think i totally not understand your question.

A global positioning system (used for moving around and finding directions, also for seeing where your car might be in case of theft if it's a very advanced system, the system however is at best 2 meters off) needing to tap into your parking brake for safety reasons?

Also tapping it into a vehicle's speed sensor is ridiculous. It gets it's info from satellites circling around earth and is more precise at higher speed then your VSS (off by max 5% instead of your VSS 10%).
Erm, right... Please tell me why. I cannot quite understand it.
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#3 (permalink) Old 01-08-2012, 09:42 AM
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The unit I have relies on connection to VSS for turn-by-turn directions. It is advertised are more accurate in the unit manual. The unit will only allow for playing of DVDs and setting navigation coordinates when the parking brake is applied. Again, this is for safety reasons by the manufacturer.

This 3-wire hookup bypass is designed to make the unit think the parking brake is always engaged. Without the parking brake connection, the unit grays out most of the functionality. I need a way to either wire up the parking brake or get a bypass unit like mentioned above that will ground out the parking brake and fool the unit.

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#4 (permalink) Old 01-08-2012, 12:37 PM
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'The unit' is referring to something else then GPS then? Have you tried the forum of the manufacturer or some tuning forum? Because this is not related to the Toyota RAV4 but an aftermarket system.

And why on earth would you want to watch a DVD while driving? Navigation i can understand tough.
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#5 (permalink) Old 01-08-2012, 07:15 PM
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Sorry, this should be in the 4.2 section. To answer your question, the unit is a dvd/gps combo system. You can only adjust the gps settings while the parking break is on

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#6 (permalink) Old 01-08-2012, 11:44 PM
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Cool Lets make this a simple answer

The brake wire is green/white wire at the brake pedal switch. The VSS or speed sensor is purple/white at the ECM behind glove box. Hope this helps.

Last edited by dtalk; 01-08-2012 at 11:46 PM. Reason: add
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#7 (permalink) Old 01-09-2012, 09:02 AM
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Originally Posted by 03rav4inPA View Post
Sorry, this should be in the 4.2 section. To answer your question, the unit is a dvd/gps combo system. You can only adjust the gps settings while the parking brake is on
So are you trying to defeat the park brake safety feature or make it work as intended?
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#8 (permalink) Old 01-09-2012, 09:09 AM
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Originally Posted by Dr. Dyno View Post
So are you trying to defeat the park brake safety feature or make it work as intended?

Trying to fool the headunit into thinking the parking brake is always on. Otherwise I can't change my destination on my gps without parking and engaging the parking brake. I bought a bypass kit that is supposed to come in the mail this week. 3-wire setup. We'll see what the instructions say...

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#9 (permalink) Old 01-09-2012, 09:09 AM
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Quote:
Originally Posted by dtalk View Post
The brake wire is green/white wire at the brake pedal switch. The VSS or speed sensor is purple/white at the ECM behind glove box. Hope this helps.
Thanks for the info!

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#10 (permalink) Old 01-09-2012, 02:42 PM
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Okay, lets think about how it must be designed to work. All the features are supposed to work only when the car is stopped with the parking brake on. Under those conditions the VSS, vehicle speed sensor, signal would be zero and the parking brake would be 12V with it on. So unless it has some sophisticated thinking built in, simply grounding the VSS wire and putting 12V on the park wire would fool it.
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