The Subaru SVX World Network   SVX Network Forums
Live Chat!
SVX or Subaru Links
Old Lockers
Photo Post
How-To Documents
Message Archive
SVX Shop Search
IRC users:

Go Back   The Subaru SVX World Network > SVX Main Forums > Technical Q & A

Reply
 
Thread Tools Display Modes
  #16  
Old 06-07-2007, 07:34 AM
ItsPeteReally ItsPeteReally is offline
Registered User
 
Join Date: Feb 2006
Location: Ipswich, Suffolk
Posts: 143
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.
__________________
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
Reply With Quote
  #17  
Old 06-07-2007, 02:21 PM
Nomake Wan's Avatar
Nomake Wan Nomake Wan is offline
Retired
 
Join Date: Jan 2007
Location: Orange, CA
Posts: 1,031
Send a message via AIM to Nomake Wan Send a message via MSN to Nomake Wan Send a message via Yahoo to Nomake Wan Send a message via Skype™ to Nomake Wan
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?
Reply With Quote
  #18  
Old 06-07-2007, 02:43 PM
b3lha's Avatar
b3lha b3lha is offline
Phil & Belha
 
Join Date: Aug 2001
Location: Alcyone Limited, Buckinghamshire UK
Posts: 2,671
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.
__________________
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.
Reply With Quote
  #19  
Old 06-07-2007, 04:59 PM
Nomake Wan's Avatar
Nomake Wan Nomake Wan is offline
Retired
 
Join Date: Jan 2007
Location: Orange, CA
Posts: 1,031
Send a message via AIM to Nomake Wan Send a message via MSN to Nomake Wan Send a message via Yahoo to Nomake Wan Send a message via Skype™ to Nomake Wan
I tested all four, and all four came out around 12V. So they're active...

Time Control Unit eh?
Reply With Quote
  #20  
Old 06-08-2007, 12:56 AM
b3lha's Avatar
b3lha b3lha is offline
Phil & Belha
 
Join Date: Aug 2001
Location: Alcyone Limited, Buckinghamshire UK
Posts: 2,671
Quote:
Originally Posted by Nomake Wan
Time Control Unit eh?
Yep, time for a new one.
__________________
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
Reply With Quote
  #21  
Old 06-08-2007, 07:05 AM
Nomake Wan's Avatar
Nomake Wan Nomake Wan is offline
Retired
 
Join Date: Jan 2007
Location: Orange, CA
Posts: 1,031
Send a message via AIM to Nomake Wan Send a message via MSN to Nomake Wan Send a message via Yahoo to Nomake Wan Send a message via Skype™ to Nomake Wan
Thanks for all of your help. One mystery down, 1 to go.
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -6. The time now is 07:53 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
© 2001-2015 SVX World Network
(208)-906-1122