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#16
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You've made some fine progress Nomake, but don't get another switch just yet.
It's unfortunate, in this circumstance, that none of the individual circuit diagrams/connector layouts give all the information you might need on a single sheet of paper. Indentifying each individual conductor in each connector is, as you have found, exceedingly difficult and potentially error prone. That's why I have been excessively cowardly and not told you exactly what to do b3lha has made some good recommendations for further testing, it seems to be a pretty convincing argument too.
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I often say that when you can measure what you are speaking about, and express it in numbers, you know something about it; but when you cannot measure it, when you cannot express it in numbers, your knowledge is of a meagre and unsatisfactory kind; it may be the beginning of knowledge, but you have scarcely in your thoughts advanced to the state of Science, whatever the matter may be. Sir William Thomson |
#17
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I hate being wrong sometimes.
It is indeed a problem with the Time Control Unit. Pins 12 and 13 have a 000.4 resistance to a known good ground, connecting pins 4 and 14 do not activate the lights, and resistance changes when reading pins 4 and 14 and moving the dimmer knob. So... guess that means I'm in the market for a new Time Control Unit. Anybody got one laying around? |
#18
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One final test you could do:
As far as I can tell, the time control unit is not a single circuit. It's several completely separate circuits that just happen to be inside the same box. That's why the other functions of the time control unit still work. Only the circuit that provides the duty cycle to dim the dash lights has failed. The dimmer duty-cycle circuit , inside the time control unit, requires power to do its thing. There are four power connections on the time control unit: a3 (red), a7(blue/white), b2(blue/red) and b9(red/white) [a=B91, b=B90]. I don't know which of these is the right one, but it could be worthwhile to check that they are all live. Just set your meter to volts, connect the black probe to ground and the red probe to each one in turn.
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Subaru ECU and TCU Website 1992 Alcyone SVX Version L 1992 Alcyone SVX Version L 1994 Alcyone SVX S40-II 2004 Subaru Legacy 2.5 SE Sports Tourer 1996 Subaru Legacy 2.2 GX Wagon 1988 Subaru Justy J12 SL-II Last edited by b3lha; 06-07-2007 at 02:46 PM. |
#19
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I tested all four, and all four came out around 12V. So they're active...
Time Control Unit eh? |
#20
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Quote:
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Subaru ECU and TCU Website 1992 Alcyone SVX Version L 1992 Alcyone SVX Version L 1994 Alcyone SVX S40-II 2004 Subaru Legacy 2.5 SE Sports Tourer 1996 Subaru Legacy 2.2 GX Wagon 1988 Subaru Justy J12 SL-II |
#21
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Thanks for all of your help. One mystery down, 1 to go.
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