No outside air temp on display

SURTEESS · #1 02-06-2012, 12:14 PM

OK - so after sitting for the best part of 3 months, decided to take my baby out for a drive.

When turning on the aircon & adjusting air temp up from min - after a few seconds it decides all by itself to return to min temp?
(cannot hold the temp set by me - even has occasional, random - beeping coming from dashboard with no display showing).

Also the outside temp switch will not switch the display (inside/outside).

Any suggestions.

aust92pearl · #2 02-06-2012, 02:30 PM

Quote:

Originally Posted by SURTEESS

OK - so after sitting for the best part of 3 months, decided to take my baby out for a drive.

When turning on the aircon & adjusting air temp up from min - after a few seconds it decides all by itself to return to min temp?
(cannot hold the temp set by me - even has occasional, random - beeping coming from dashboard with no display showing).

Also the outside temp switch will not switch the display (inside/outside).

Any suggestions.

the climate control unit in my first pearlie did the same thing , unsure why but on the odd occasion at extremely random intervals it would work normal for a minute then continue with its tom foolery and go to min temp

icingdeath88 · #3 02-06-2012, 02:49 PM

See this link for discussion on the JDM style A/C controls and how one member fixed his: http://www.svxworldforums.com/view_t...14&forum_id=15

SURTEESS · #4 02-06-2012, 05:05 PM

think the issue must be an oxidised switch - after about 10 minutes it tends to sort itself out - now 4 days in a row without any issues (touch wood!!!)

SURTEESS · #5 02-08-2012, 10:02 AM

Seems to have sorted it'self out - but heading over to see NUTSHL in a few weeks time, he has an SVX in pieces & I am keen to check the condition & see what parts I might need

Thanks PADDLESNZ for the Japanese web link below on how to fix the pcb in the aircon unit - will post some pictures from both units once I get time.

http://genmei.itline.jp/~svx/diary/?date=20040912

Looks like the properble cause is power supply ripple getting through the C2 (inductor) / C9 (Capacitor) line - will trace both back to source & measure both voltage & ripple from each unit supply.
It maybe that replacing both + replacing supply capacitor - upstream (with a bigger/newer one) elsewhere on the pcb may aid with the issue.
C2/C9 also goes to resistor network (pull-ups) from the VCC of Motorola IC MC1401x (could be a buffer driver chip) - will know full number when I get more into it.