M-benz

Guys,

I need help on the wiring .... I mean got the most speaker wiring match up already but just these wires from 99 civic are confusing me . Please check below ,

99 civic Si.
Pin 10 white/blue (constant power).
Pin 2 YEL/RED (ACC main stereo supply).
Pin 19 Red Dash light brightness.
Pin 9 red/black lights on signal.

89 civic Si


Radio Constant 12V+ Wire: White/Blue
Radio Switched Ignition 12V+ Wire: Yellow/Red
Radio Ground Wire: Black
Radio Illumination Dimmer Wire: Red/Black
Radio Antenna Trigger Wire: N/A
Radio Amplifier Turn On Wire: N/A
Front Speaker Size: N/A
Front Speaker Location: N/A
Left Front Speaker Wire (+): Blue/Green
Left Front Speaker Wire (-): Gray/Black
Right Front Speaker Wire (+): Red/Green
Right Front Speaker Wire (-): Brown/Black
Rear Speaker Size: N/A
Rear Speaker Location: N/A
Left Rear Speaker Wire (+): Blue/Yellow
Left Rear Speaker Wire (-): Gray/White
Right Rear Speaker Wire (+): Red/Yellow
Right Rear Speaker Wire (-): Brown/White


How do I match them up ? Thanks in advance

M-benz

Anyone ?

jdm_rb20

ok...on the 99:

pin 10 "constant" goes to the 89 "constant 12v"
pin 2 "ACC main supply goes to the 89 "switched ignition" power signal

I would not bother with pin 19 and pin 9. A 1989 model car only expects 1 signal dealing with headlights/dimming. The 1 signal comes from the dimmer switch ONLY when the headlights/parking lights are ON. Even on regular CD players, I don't bother hooking up the "dash illumination" wire. It just dims the CD player lights with the car's dashlight dimmer switch (which in older cars, did not require a "lights on" signal). I am not sure exactly how pin 9 is supposed to be wired (according to honda, anyway).

In your case, I am willing to bet that even if you hook up the illumination wire, it may not change brightness by your dimmer switch UNLESS you wire up pin 9 to a wire that gets a signal when the headlights/parking lights are turned on....which, again, is usually the WHOLE POINT of a simple 1wire dimmer switched illumination wire...it wouldn't come on UNLESS you turned on the parking/headlights...

If my ASSSUMPTIONS are right so far, the real question is: Should pin9 receive a POSITIVE or NEGATIVE signal (to let the '99 CD player know that the lights are on). :0

If you have the speaker wires working, and I gave you the correct power wiring (doublecheck with testlight, please)....you should have a working CD player.. Call it a WIN and stop while you are ahead :D

Z0831xiz

great job ^ and I need this wire platform. I think my 89 si has the OEM radio hardness with plug in.. :O


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jdm_rb20

Thanks. But I hope everyone realizes that I am NOT there to confirm (through wire-testing) those wires. He did the research, I am just matching up the wire names he listed and giving a description.

Always research, check, and doublecheck before doing an install. I simply "know the lingo" bc I have been putting in my own stereos/amps/etc since before '99..lol However, to this day, I have never owner anything newer than a '96. (I have never believed in paying $20,000+ for a stock vehicle when I can build one for $500-3,000 depending on my goal. :D

Oh, yeah...just get a wire harness adapter from walmart so your factory wires will be color coded and you won't have to cut the OEM harness to install a different stereo.

M-benz

Ok I did what u said and I got 12V by connected the pin 2 to the 89 switched ignition but when I connected the pin 10 constant 12V to 89 constant one I got .67V ..this is where I'm confused . Any idea?
I used the meter to test them .

schueytenten

Metra sells a female pigtail to plug into the back of the civic radio. Buy the male plug for your stock 89 civic radio plug and splice all the corresponding wires together.

Works great unless your civic plug has been hacked, then you have more work.

g.r.crx

save the trouble i currently have one in my crx. http://www.ebay.com/itm/Honda-OEM-FACTORY-Radio-INSTALL-WIRE-HARNESS-Wiring-Plug-HN-1721M-/200704819655?pt=Motors_Car_Truck_Parts_Accessories&fits=Model%3ACivic%7CSubmodel%3ASi&hash=item2ebaf081c7&vxp=mtrspliced in and call it a day. also hope you have the si radio code.

M-benz

I'm using the same one you have . The weirdest part is I tried to put the stock radio back and it was working fine . Meaning that there is nothing wrong with the wires . This is so frustrated .....

g.r.crx

you sure the si radio is good? go to best buy and buy the female pigtail for your chasis and wire it to the male plug to your radio so it would be a jumper harness kinda like ecu jumper harness,

M-benz

There is possibility that the unit has defect by itself but idk .

jdm_rb20

you had 12v when you connected pin2 to the 1989 switched.......is that with the key on or off. By definition, you should only have 12v on the 1989 switched wire when the key switch is on.

If that is right, check the 1989 constant wire for 12v with the key on and key off....please do this with the 1999 CD player pin10 DISCONNECTED. Since your factory 1989 radio works, I would expect that wire to have 12v at all times. If not, maybe your factory 1989 radio can work with just the voltage supplied by the "switched wire"??

jdm_rb20

If you want to test the 1999 CD player to see if it works, wire the CONSTANT 12v and the SWITCHED 12v wires to a working 12v wire. This will give the CONSTANT wire the power to run the CD player, but it will also tell the SWITCHED wire that the CD player is allowed to power on (because it thinks the key is on).

Anyway, please answer my last questions to check for proper voltages on the factory wiring during proper conditions....then let me know if the CD Player powers on when you give 12v to both wires (constant and switched).

M-benz

i only got .68V on this constant 12V ...key on and off same thing . Looks like your assumption is correct . The stock radio works because it only need the voltage from the trigger wires

I will test the 99 one tomorrow and report back . Thanks for the helps and being patient w me .

M-benz

Where would be the good 12V wires to test this ? And what's the purpose of having this constant 12V wires ? Can the system work w/o it ?

jdm_rb20

Actually, now that you ask me the purpose, I realize the error of what I said earlier: I realized the CONSTANT's primary purpose is to remember settings/stations/etc. So, I correct myself, the SWITCHED wire is the power source that really "powers" the CD player....it is just conveniently turned off by the switch to prevent battery-drain. The miniscule need of power to store those settings is allowed by the use of a CONSTANT wire.

So it is likely that your old radio works but DOES NOT remember stations...try that out. Put it on a specific station, turn the key off for 1 minute, and then turn the radio back on......is it still on the same station?

You said you had 12v on the switched wire. You can hook up both CD player wires to this SWITCHED power source. If the CD player works, it will not be able to store the settings while it is wired this way.

M-benz

Alrity ... Things start to make sense now

jdm_rb20

I've been putting in my own radios for 16 years now, but I have never really studied the INSIDE of a radio.

However, because of technology, what is FACT on 1 day, will be obsolete next week.

I always firmly "believed" that the constant wire was the true POWER wire, so I always put in bigger CONSTANT wires to allow more power. However, I admit I am no expert. If I was in a hurry, I would wire both wires to the SWITCHED power (even though it wouldn't store the settings) or both wires to the CONSTANT wire (even though I would have to manually turn off the radio EVERYTIME I turned off the car).

However, I have never really attempted to install a radio using only 1 of the radio's power wires (that I remember anyway). I am just trying to make sure you understand that I am not an expert on the INSIDE of a radio... I just have the experience with the wiring install.

Hook up both power wires to your switched 12v and the CD player should turn on (but won't remember settings). If the CD player works, leave it as-is, or figure out why the 1989 CONSTANT wire has no voltage...fix it....then wire the CD player correctly.

M-benz

I'm not too worried about the 99 radio but since that I only got .68V out of the constant 12V this question me alot . And if I don't fix this I don't think I will be able to hook up the after market deck either .

jdm_rb20

Hook up both wires to the switched power source. If it works, figure out why the CONSTANT power source isn't providing 12v. Orrrrrrr, if you can't solve it, you can run 1 wire from the fuse box in the car. Just make sure you tap it into a wire that ALWAYS "constantly" has 12volts. My civic EF conveniently has extra spade connectors that I can add an accessory to.

So just run 1 new wire if you can't fix your 1989 "constant" wire.

M-benz

Your the man ... I totally forgot about running a wire straight from the fuse box . Silly me lol.