pioneer deh 45dh car stereo
Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=125759
Printed Date: July 13, 2025 at 11:43 AM
Topic: pioneer deh 45dh car stereo
Posted By: alklb
Subject: pioneer deh 45dh car stereo
Date Posted: January 20, 2011 at 11:27 AM
I have a Pioneer DEH-45DH in dash CD / Stereo unit. I would like to install this in my 1989 Cadillac. The car has a Power Antenna. I have searched all over for a user manual. All I have found is the service manual which has no installation information. Does anyone know if I can install this radio using the wiring harness adapters and use the power antenna?
Thanks for the help!
Alan NYS
Replies:
Posted By: itsyuk
Date Posted: January 20, 2011 at 11:45 PM
on that pioneer model there is a blue w/white stripe wire in the harness. it is used to turn on amps and power antennas.
if you are going to hook up more than 2 devices, say you have a main amp, a sub amp and the antenna, use that wire to operate a relay (a diagram is on this site) that will turn those devices on. you only get one chance to mess up blow that blue w/white stripe wire circuit ... so make sure you do it right.
here is the manual on the pioneer website.
https://www.pioneerelectronics.com/pio/pe/images/portal/cit_11221/49927891installation%20manual%20deh-p4600mp.pdf ------------- yuk
quiet rural missouri, near KC.
If your system moves you physically and not emotionally, you have wasted your money.
Posted By: itsyuk
Date Posted: January 20, 2011 at 11:47 PM
ooops .. i posted the wrong manual ..
but it pretty much is the same. use the blue/white wire.
if you go to the pioneer-electronics.com site you can probably find a manual. ------------- yuk
quiet rural missouri, near KC.
If your system moves you physically and not emotionally, you have wasted your money.
Posted By: alklb
Date Posted: January 21, 2011 at 8:52 AM
Thanks! I am not using any amp. The only wire with any blue off the radio is a meduim solid blue with an in-line fuse. There is no manual to be found for this model. Going from top left across the top row : black /green stripe, BLACK/ white stripe, black to a clip with another black in lower row, red w/ acc tag, yellow w/ ILL tag, gray/black stripe, GREEN/ blac stripe.
Second row from the left: GREEN/ red stripe, gray/white stripe, black to the clip with the black in the top row, orange w/ battery tag and inline atc fuse, med blue w/ in line .5 old fashioned glass fuse, solid gray, solid green.
I bought a adapter to plug into the caddy. Here is a pic if it helps.
This is the link if pic does not load: https://www.breslow.net/cadcable.htm

Thanks! Alan
Posted By: itsyuk
Date Posted: January 21, 2011 at 10:41 AM
print this. it might give you everything you want.
https://www.bcae1.com/temp/deh45.pdf ------------- yuk
quiet rural missouri, near KC.
If your system moves you physically and not emotionally, you have wasted your money.
Posted By: alklb
Date Posted: January 21, 2011 at 2:48 PM
It looks good! Thank you!
Posted By: alklb
Date Posted: January 22, 2011 at 1:18 PM
Last q's please.
On the harness to the car it says on the wire: dimmer. Do I need to hook this up?
On the harness to the car it says on a wire: 12 volt ignition switched and on the radio harness it says: acc. Are these the same?
On the harness to the car it has one black wire and on the radio harness it has two black wires that end together. Do i join all three or do I find a metal spot on the car to put all of these grounds?
Thanks!
Posted By: itsyuk
Date Posted: January 22, 2011 at 1:33 PM
dimmer sometimes on those old pioneers made the buttons light up when you hade the headlights on ... i dont know if that would be yours or not.
i believe you are right on the switched and acc being the same. it should be the red wire on the radio and end up connected to the yellow in the actual caddy harness...is that right?
i odnt understand thet third question. if there is a wire that has a "c" connector for grounding i would ground it.
if you have a meter to test ohms. see if the ohms between the other black wires and the regular ground is less than one(dont be touching the wires yourself for this test). if it is, i think i would ground them. if not, i would tape them seperatly so they cannot short to anything. ------------- yuk
quiet rural missouri, near KC.
If your system moves you physically and not emotionally, you have wasted your money.
Posted By: alklb
Date Posted: January 22, 2011 at 5:40 PM
i odnt understand thet third question. if there is a wire that has a "c" connector for grounding i would ground it.
I wrote:
On the harness to the car it has one black wire and on the radio harness it has two black wires that end together. Do i join all three or do I find a metal spot on the car to put all of these grounds?
better expl:
The caddy harness adapter has one black wire. On the radio harness there are two black wires. One in the top row and one in the bottom row, both being attached from the factory to a end with a hole in it for a bolt.
Posted By: itsyuk
Date Posted: January 22, 2011 at 11:15 PM
probably ground them to some good clean metal is best. ------------- yuk
quiet rural missouri, near KC.
If your system moves you physically and not emotionally, you have wasted your money.
Posted By: itsyuk
Date Posted: January 22, 2011 at 11:17 PM
sounds like one strange pioneer harness.
have you hooked that radio up on a bench to make sure it works good and plays burned cds (if that is what you plan on playing) ------------- yuk
quiet rural missouri, near KC.
If your system moves you physically and not emotionally, you have wasted your money.
Posted By: alklb
Date Posted: January 23, 2011 at 11:40 AM
It worked in an old car a while ago. I do not have a bench or testing equip. I am not a mechanic or anyhing of the sort.
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