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#1
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Strange speaker wires in RAV4
I am trying to install a new head unit in a japanese model 94 Rav4.
There is something strange going on with the wires that were going into the back of the previously installed head unit. The plug on the back of the old unit wasn't the same as that on the new (Panasonic) unit. So I cut the old plug off and installed push on connectors on each of the wires. I've found the gnd wire and the always on and on-with-ignition 12V wires. But I am having trouble with the remaining 9 wires. I tried connecting the output of one side of the head unit to every combination of pairs of wires (I known not a good idea). That sometimes resulted in sound at each of the speakers, but overlaid on top of that was a heavy rumble of electrical engine noise. On further investigation there was 5V present at 5 out of 9 of the remaining wires. That left 4 wires with 0V present (as I would expect for speaker wires) However as there are 4 speakers I should expect to see 8 wires available. I tried outputting a signal between each wire and earth, but that produced no result. I also opened up the door panel and checked for continunity between the speaker in the door and each of the wires. None of them showed a connection. So there is something strange going on with the speaker wiring. The old radio (a Mitsu****a or something I think) worked fine (well for a Cr*ppy old radio at least). Anyone seen anything like this before? Pete -- Remove pants from email address to reply. |
#2
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Strange speaker wires in RAV4
The only thing I can think of is there is a factory amplifier in the vehicle. Easy way to know is if there was only one plug behind the radio. Typically most US models of Toyota's will have two plugs for non-amplified systems and one for amplified systems.
"Peter Grooby" wrote in message .. . I am trying to install a new head unit in a japanese model 94 Rav4. There is something strange going on with the wires that were going into the back of the previously installed head unit. The plug on the back of the old unit wasn't the same as that on the new (Panasonic) unit. So I cut the old plug off and installed push on connectors on each of the wires. I've found the gnd wire and the always on and on-with-ignition 12V wires. But I am having trouble with the remaining 9 wires. I tried connecting the output of one side of the head unit to every combination of pairs of wires (I known not a good idea). That sometimes resulted in sound at each of the speakers, but overlaid on top of that was a heavy rumble of electrical engine noise. On further investigation there was 5V present at 5 out of 9 of the remaining wires. That left 4 wires with 0V present (as I would expect for speaker wires) However as there are 4 speakers I should expect to see 8 wires available. I tried outputting a signal between each wire and earth, but that produced no result. I also opened up the door panel and checked for continunity between the speaker in the door and each of the wires. None of them showed a connection. So there is something strange going on with the speaker wiring. The old radio (a Mitsu****a or something I think) worked fine (well for a Cr*ppy old radio at least). Anyone seen anything like this before? Pete -- Remove pants from email address to reply. |
#3
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Strange speaker wires in RAV4
Yikes... stop everything and review a shop manual or do a little www
research before you fry something. Id hate to see you wire the 5V+ potential across the head units amp outputs. I think they sell wire harness kits at Crutchfield. Those usually come with a wire color code diagram. Good Luck!! Garrett Peter Grooby wrote: I am trying to install a new head unit in a japanese model 94 Rav4. There is something strange going on with the wires that were going into the back of the previously installed head unit. The plug on the back of the old unit wasn't the same as that on the new (Panasonic) unit. So I cut the old plug off and installed push on connectors on each of the wires. I've found the gnd wire and the always on and on-with-ignition 12V wires. But I am having trouble with the remaining 9 wires. I tried connecting the output of one side of the head unit to every combination of pairs of wires (I known not a good idea). That sometimes resulted in sound at each of the speakers, but overlaid on top of that was a heavy rumble of electrical engine noise. On further investigation there was 5V present at 5 out of 9 of the remaining wires. That left 4 wires with 0V present (as I would expect for speaker wires) However as there are 4 speakers I should expect to see 8 wires available. I tried outputting a signal between each wire and earth, but that produced no result. I also opened up the door panel and checked for continunity between the speaker in the door and each of the wires. None of them showed a connection. So there is something strange going on with the speaker wiring. The old radio (a Mitsu****a or something I think) worked fine (well for a Cr*ppy old radio at least). Anyone seen anything like this before? Pete |
#4
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Strange speaker wires in RAV4
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#7
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Strange speaker wires in RAV4
i can tell you right now as a professional installer (well certified at
least) that cutting the factory harness off was real dumb. you should've made sure you couldnt find a factory adapter before doing that.. and another thing, it was probly even dumber to start connecting random wires. But i'm not one to put someone else down so i'm going to try to help you here. Obviously this particular vehicle has an external amplifer for the head unit.. probly burried in the car somewhere.. these are usually not easily by-passed with tearing things up in the car so i'd recommend you put the factory harness back together by soldering and heat shrinking to make it nice and tight again then i'd keep looking for a factory plug adapter Just what i'd do. DJ TecThreat "Peter Grooby" wrote in message .. . I am trying to install a new head unit in a japanese model 94 Rav4. There is something strange going on with the wires that were going into the back of the previously installed head unit. The plug on the back of the old unit wasn't the same as that on the new (Panasonic) unit. So I cut the old plug off and installed push on connectors on each of the wires. I've found the gnd wire and the always on and on-with-ignition 12V wires. But I am having trouble with the remaining 9 wires. I tried connecting the output of one side of the head unit to every combination of pairs of wires (I known not a good idea). That sometimes resulted in sound at each of the speakers, but overlaid on top of that was a heavy rumble of electrical engine noise. On further investigation there was 5V present at 5 out of 9 of the remaining wires. That left 4 wires with 0V present (as I would expect for speaker wires) However as there are 4 speakers I should expect to see 8 wires available. I tried outputting a signal between each wire and earth, but that produced no result. I also opened up the door panel and checked for continunity between the speaker in the door and each of the wires. None of them showed a connection. So there is something strange going on with the speaker wiring. The old radio (a Mitsu****a or something I think) worked fine (well for a Cr*ppy old radio at least). Anyone seen anything like this before? Pete -- Remove pants from email address to reply. |
#8
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Strange speaker wires in RAV4
In article , "DJ TecThreat"
beaniATcharter.net says... i can tell you right now as a professional installer (well certified at least) that cutting the factory harness off was real dumb. you should've made sure you couldnt find a factory adapter before doing that.. and another thing, it was probly even dumber to start connecting random wires. But i'm not one to put someone else down so i'm going to try to help you here. Obviously this particular vehicle has an external amplifer for the head unit.. probly burried in the car somewhere.. these are usually not easily My current thoughts are that if I can't find the amp easily, I'll just run a new set of wires to each speaker, shouldn't be a big job hopefully. Pete -- -- Remove pants from email address to reply. |
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