View Full Version : Would this relay be suitable for parking brake bypass on Pioneer avh-2400bt

12-20-2012, 08:08 AM
Hey all,

I know the Pioneer AVH's need a Relay for the parking brake bypass to work (as it cant see ground when it comes on or it will fail to work)

I am just wondering, would this relay I have found be fit for purpose?

maplin co uk sealed-reed-relays-2605

Reed Relay 12V SPST

Also, I have heard it is wise to put a diode in on the amp power on wire. Would any do? For example:

maplin co uk 0.5w-zener-diodes-19089

Thanks to any one that can help :)

12-20-2012, 09:11 AM
Just remembered it actually needs to be a SPDT

Would a 30Amp one be too much?

30A SPDT Auto 12Vdc
Order Code: N00AW ?


12-20-2012, 01:28 PM
Just remembered it actually needs to be a SPDT

Would a 30Amp one be too much?

No, that's fine.

12-20-2012, 01:42 PM
I'd recommend getting a Microbypass instead. Much easier to fit behind the HU when all is said and done. Mine has worked great since October.

12-20-2012, 01:48 PM

Pioneer AVH P3400BH AVH P3400DVD Parking Brake Bypass No Switch Auto DVD Video | eBay (http://www.ebay.com/itm/PIONEER-AVH-P3400BH-AVH-P3400DVD-PARKING-BRAKE-BYPASS-NO-SWITCH-AUTO-DVD-VIDEO-/120859970465)

u can probably find a cheaper one than this, but heres an example

12-21-2012, 07:31 AM
Are these "Microbypass" things just smaller Relays? Like the reed relays i found? Would a SPDT Reed Relay do the trick, is there any reason not to use one.

if not what is the microbypass, does any one have schematics for it?

thanks for the replies so far!

12-21-2012, 10:53 AM
Picked up a 20/30A 5 Pin Relay from the local Car Parts store. Hopefully that will do the trick

Thanks All

12-21-2012, 10:55 AM
it will and there not eben big easy to toss behind the radio and forget about