Parking Brake Wire Switch for Head unit Install

you could connect it to the switched +12, but that will bypass the brake pedal.

I don't know if the prius has a sensor on the parking brake. usually they are ground based (connect to ground when the brake is on) anyhow..

if there IS a ground based sensor, then you will have to install a relay which switches
+12 using the brake signal to close the relay..

the switched signal goes thru the relay on pins 87 & 30.
the switching goes thu pins 85 & 86.

so you would wire up +12 to 30 & 85,
ground from the brake to 86.
the lead from the radio to 87..

usually those leads require ground tho..

Sam

 

sorry, not thread hijacking, just asking a related question --- (Colonel, I know this is not what you want) if you just ground the wire will the system will work in motion? or does it need to be a (+) source?

don't worry I'm not stupid enough to watch video in motion, I just want my wife to be able to program the NAV while in motion.

 

Parking Brake is hand/foot ratcheting brake used during parking = negative trigger
Brake wire is foot pedal used to slow down the car = positive trigger
The reason they supply such long wire is to anticipate the installers doing the connection at the taillight. You can catch the both parking brake and foot brake wires at the kick panel or at the switch. The parking brake is believe is green and the foot brake is blue. sometimes they have silver dots. Always use a multimeter and not test lights.

Edit: The reason why some units have both + and - parking brake wires is to anticipate installing in a positive trigger parking brakes. The reason why some units have both parking brake and foot brake is to discourage bypassing the safety system. You need to hook up both foot and parking brakes so that you can do a sequence of actions to activate the video screen such as applying the foot brakes twice before parking brake.

 

another thread on it.... http://priuschat.com/forums/gen-iii-2010-prius-audio-electronics/82893-where-wire-parking-brake.html

 

yes, I know -- but for a minute there it seemed like spiderman DID locate it....but apparently nobody has?!?!?

 

cause I don't think it has one.. there is no indication on the console that the parking brake is on..

it is NOT required..
| for the manufacturer to supply a parking brake signal detection wire
|| well, bigger idiot than I thought I was.. there is the word 'brake' right there on the console.. never mind

sam

 

You missed the point. The poster is saying that the *Prius* doesn't have a parking brake sense wire. He bases this on not seeing an indicator light on the dash when the parking brake is set. Not having a Gen III, I cannot say whether this is correct.

Your reply was about your new head unit, which is not related to the poster's comment.

Tom

 

hm.. never saw it over there..

SO, you'd pull off the lower dash, as if doing the fog light mod, and find the wire on the pedal.. its outside the kick panel..altho u may have to remove that too..

I'll find it in a few weeks when I do all those mods..
(parts and a little cooler)..

Sam

 

This is what you have to do to bypass it - buy a switch and hook up that wire to one of the terminals on the switch and run another wire from the other terminal to a ground. When you want to play a DVD just hit the switch and you should be go to go, just don't use while car in in drive.

 

he wants someone to tell him the location and color of the wire connected to the parking brake.. he 'knows' what to DO with it.. just not where it is..

Sam

 

It's at the switch. Did you read post #4? This is where all the install docs tell you to go to get the friction brake and the emergency brake for all the cars, even if they're buried behind loads of other harness, plugs, junction boxes. For the friction brake wires you can sometimes catch it at the driver side kick panel if you know what color it is. You can tell what color it is by accessing the back of the taillight assembly and trace the wires to the brake lights.

 

It never stopped my wife.

Tom