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Registriert seit: Feb 2014
Beiträge: 11
stranger
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OP
stranger
Registriert seit: Feb 2014
Beiträge: 11 |
hi all,
i have a strange problem with my 93 V8, hoping some of you guys can help me.. when its warm weather (+21 degrees Celsius) the speedometer, radio, cruise control and the on board computer all stop working. everything else seems to work just fine (rpm needle, fuel/oil meters, automatic transmission shifts like normal) when i put the AC on for some time, everything comes back to live again (depends how warm it is, form 10 to 30min driving)
Does anyone knows whats going on here?
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Registriert seit: May 2006
Beiträge: 21,692 Likes: 2
Carpal \'Tunnel
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Carpal \'Tunnel
Registriert seit: May 2006
Beiträge: 21,692 Likes: 2 |
Not really strange...
If the speedometer is down, radio, cruise control an BC got no speedsignal...
The same if the speedometer have a intern loose connection.
It's all about the speedometer, some part in there are sensible to warmth, maybe some (or just one) electrolytic capacitor, but which?
When the slaughter of my silvern V8 is over, I go ahead to check this problem on my own V8, maybe I find something.
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Registriert seit: Feb 2014
Beiträge: 11
stranger
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OP
stranger
Registriert seit: Feb 2014
Beiträge: 11 |
ok... but why does the radio needs the speedometer ?
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Registriert seit: Aug 2003
Beiträge: 2,004 Likes: 3
Pooh-Bah
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Pooh-Bah
Registriert seit: Aug 2003
Beiträge: 2,004 Likes: 3 |
speed signal is needed for automatic radio volume control. It increases the radio volume successively at higher speed.
Beste Grüße Tim
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Registriert seit: Feb 2014
Beiträge: 11
stranger
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OP
stranger
Registriert seit: Feb 2014
Beiträge: 11 |
that makes no sense...
i have a'n after-market radio.. the radio only needs a constant 12v and a switched 12v to work...
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Registriert seit: Aug 2003
Beiträge: 2,004 Likes: 3
Pooh-Bah
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Pooh-Bah
Registriert seit: Aug 2003
Beiträge: 2,004 Likes: 3 |
how should we know, that your car isn't equipped with a factory fitted radio? Your question was about the coherences between the speed signal and the radio.
Beste Grüße Tim
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Registriert seit: May 2006
Beiträge: 21,692 Likes: 2
Carpal \'Tunnel
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Carpal \'Tunnel
Registriert seit: May 2006
Beiträge: 21,692 Likes: 2 |
In Antwort auf:
i have a'n after-market radio.. the radio only needs a constant 12v and a switched 12v to work...
Don't forget ground
In this case it makes really no sense...
Some funny lads don't know how to replace the original connectors for after-market-radios, sometimes the blue/white wire is the problem - the speedometer-signal-wire.... somewere behind the radio... look if it fit well in a (unused) connector.
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Registriert seit: Feb 2014
Beiträge: 11
stranger
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OP
stranger
Registriert seit: Feb 2014
Beiträge: 11 |
sorry, i had to mention that i had an after-market radio, installed it myself
if the tacho signal is mixed up at the radio.. then this means the radio doesn't work if i turn my ignition on (not starting the engine) right? whell... the radio works like normal on colder day's this way...
i think i put my multimeter on de wires, see what i got.. if the voltage is to low, i will go and look i if can bump it up... see what happens
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Registriert seit: May 2006
Beiträge: 21,692 Likes: 2
Carpal \'Tunnel
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Carpal \'Tunnel
Registriert seit: May 2006
Beiträge: 21,692 Likes: 2 |
In Antwort auf:
then this means the radio doesn't work if i turn my ignition on (not starting the engine) right?
Not right!
For after-market-radio it's not relevant, original-radio don't need the signal, but if it's there, it regulates the volume - drive faster it will increase, drive slower it will decrease...
For your radio you need ground, permanent + and ignition +, permanent + you will find on the original connector, ground the same way, ignition + you will find beneath the passanger floor on the back of one (I don't know which) of the big connectors (black/yellow/red)
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Registriert seit: Feb 2014
Beiträge: 11
stranger
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OP
stranger
Registriert seit: Feb 2014
Beiträge: 11 |
i hooked my multimeter on the speedometer wire behind the radio, it gives when the weather is cold like 9 volts, when its hot somewhere around 3 volts... if i put external voltage (cigarette lighter) on it, the speedo comes back to life...
now the next thing is to look where the voltage drops
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Registriert seit: May 2006
Beiträge: 21,692 Likes: 2
Carpal \'Tunnel
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Carpal \'Tunnel
Registriert seit: May 2006
Beiträge: 21,692 Likes: 2 |
Very interesting!
The last two weeks it's seems to get worse... not really high temperatur - no signal... AC lo, eternity for emprovement...
With your description it seems not the signal itself is the problem, more the supply voltage.
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Registriert seit: Sep 2010
Beiträge: 283
enthusiast
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enthusiast
Registriert seit: Sep 2010
Beiträge: 283 |
Don't discount dry joints, solder connections.
Basically, dry joints are where the solder has not created a good contact between component and circuit board. Age only exacerbates the situation. Vehicle electronics are full of mediocre quality components that can seriously suffer with age. I've had anomalies on both my ur and v8. In the V8, a few things have randomly been fussy while warming up.
A good quality soldering iron (butane) can be had fairly cheaply, along with solder and flux.
85 WR quattro 90 V8 Silver, 91 V8 Black, 93 V8 Lago 93 100e quattro V6. Titan, i think
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Link in Zwischenablage kopiert
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