|
07-10-2009, 02:21 PM | #1 |
Steals terrorist's lunch
Drives: 2007 Yaris Liftback Join Date: Mar 2007
Location: Reno, Nevada, USA
Posts: 1,299
|
Request for help: diagramming a relay
In order to work around the issues I'm having with my Pioneer AVH-P3100DVD head unit always prompting the OK screen when the unit is restarted while viewing a DIVX file, and often failing to restart the audio at that time, I am pondering using a relay to keep it powered as long as the 12V accessory bus is powered up but having it draw power directly from the battery rather than the accessory bus.
I think I can do this with a standard 5-pin SPDT automotive relay but would like confirmation. I would wire it as such: 30: fusable link to radio's ACC line 85: ground 86: fusable link to 12V battery 87: not used 87a: fusable link to 12V accessory bus Would that work? And would it be enough, or would I need to yank the "ACC Cut Relay" as well?
__________________
- Brian Share the Road I often carry 2 carpool passengers and mountain bikes or snowboards/skis over a 4,500 foot elevation difference. Click the graphic above to see my detailed mileage logs. |
07-10-2009, 02:30 PM | #2 | |
Start another Oil Thread!
|
if your installer wired your radio properly you shouldn't have this problem. there is a 12V constant already in the wiring harness AT the radio. this is what keeps the radio memory intact.
__________________
Quote:
|
|
07-10-2009, 02:38 PM | #3 | |
Steals terrorist's lunch
Drives: 2007 Yaris Liftback Join Date: Mar 2007
Location: Reno, Nevada, USA
Posts: 1,299
|
Quote:
I am attempting to bypass that by drawing power directly from the battery but only when the 12V accessory bus is powered (so that it will turn off when I turn the key to the off position). I installed it myself, btw, and it works as intended. Now I'm trying to take it beyond what was intended.
__________________
- Brian Share the Road I often carry 2 carpool passengers and mountain bikes or snowboards/skis over a 4,500 foot elevation difference. Click the graphic above to see my detailed mileage logs. |
|
07-10-2009, 02:40 PM | #4 | |
Start another Oil Thread!
|
the constant wire at the radio is just that. constant.
you don't need to do this at the battery.
__________________
Quote:
|
|
07-10-2009, 03:10 PM | #5 |
Steals terrorist's lunch
Drives: 2007 Yaris Liftback Join Date: Mar 2007
Location: Reno, Nevada, USA
Posts: 1,299
|
Good point, but that only changes one connection point on the relay. A way for it to cut out when the accessory bus is not in use is still needed.
__________________
- Brian Share the Road I often carry 2 carpool passengers and mountain bikes or snowboards/skis over a 4,500 foot elevation difference. Click the graphic above to see my detailed mileage logs. |
07-10-2009, 03:11 PM | #6 | ||
Start another Oil Thread!
|
Quote:
why not simply shut off the stereo every time you're done using it? or does it still lose its position if you do this?
__________________
Quote:
|
||
07-10-2009, 03:35 PM | #7 |
Steals terrorist's lunch
Drives: 2007 Yaris Liftback Join Date: Mar 2007
Location: Reno, Nevada, USA
Posts: 1,299
|
I can see myself forgetting to turn it off someday and returning to a dead battery. Hence my desire for it to cycle off when the ACC buss is off.
__________________
- Brian Share the Road I often carry 2 carpool passengers and mountain bikes or snowboards/skis over a 4,500 foot elevation difference. Click the graphic above to see my detailed mileage logs. |
07-10-2009, 03:49 PM | #8 | |
Start another Oil Thread!
|
no, i mean shut it off now, don't change the wiring at all. if it's "off" it should retain the settings thru the constant wire, as opposed to resetting while it's in ON and loses ACC power, right?
__________________
Quote:
|
|
07-10-2009, 04:07 PM | #9 |
Steals terrorist's lunch
Drives: 2007 Yaris Liftback Join Date: Mar 2007
Location: Reno, Nevada, USA
Posts: 1,299
|
Tamago,
I appreciate you trying to help but you're quite far off the mark and don't seem to understand what I'm trying to do here. I asked for help with diagramming a relay so let's stick to that, please.
__________________
- Brian Share the Road I often carry 2 carpool passengers and mountain bikes or snowboards/skis over a 4,500 foot elevation difference. Click the graphic above to see my detailed mileage logs. |
07-10-2009, 05:40 PM | #10 | |
Start another Oil Thread!
|
BailOut, i understand fully what you're trying to do, and i don't appreciate it in the least. I'll hunker down and be helpful now.
__________________
Quote:
|
|
07-10-2009, 05:49 PM | #11 | |
Start another Oil Thread!
|
30: common to battery 12V
87: common to "stereo power wire" 85: common to "starter solenoid 12V" 86: common to GROUND. 87a: not used so, only when the starter solenoid is engaged, the relay is in operation. because you're using 87 (NO contact) you won't be powering anything when the key is turned off. and because you've hooked 30 to "constant" your ACC circuit will be backfed power directly from the battery during the "start" cycle. since the ACC circuit does not power high-draw items such as the windows or AC or fan or defrosters, you should not have an issue with battery draw during the "start" cycle. sound good? also, this can all be done right at the radio (no need to run a feed from the battery itself)
__________________
Quote:
|
|
07-10-2009, 06:28 PM | #12 | |
Steals terrorist's lunch
Drives: 2007 Yaris Liftback Join Date: Mar 2007
Location: Reno, Nevada, USA
Posts: 1,299
|
Quote:
Though it can all be done "at the radio" where would I tap into the "starter solenoid 12V" line? From the engine compartment, I presume?
__________________
- Brian Share the Road I often carry 2 carpool passengers and mountain bikes or snowboards/skis over a 4,500 foot elevation difference. Click the graphic above to see my detailed mileage logs. |
|
07-10-2009, 06:31 PM | #13 | |
Start another Oil Thread!
|
i don't know the actual yaris wiring diagram so i won't say what i think is the obvious answer (at the ignition itself). for all i know the yaris uses sinking switches instead of sourcing to send the "start" signal.
__________________
Quote:
|
|
07-10-2009, 11:29 PM | #14 |
ULTIMATE
Drives: 09 5dr LB, 2x 08 3dr LB Join Date: Oct 2008
Location: USA, CT
Posts: 13,460
|
How about just eliminating the ACC cut relay and jumping the output contact terminals? The service manual says that its purpose is just to keep the clock and meter from flickering during cranking.
You could use a jumper wire with male spade terminals. Jump 3 to 4. ACC Cut Relay.jpg |
07-11-2009, 12:49 AM | #15 | |
Steals terrorist's lunch
Drives: 2007 Yaris Liftback Join Date: Mar 2007
Location: Reno, Nevada, USA
Posts: 1,299
|
Quote:
Thanks for trying, though. Tomorrow afternoon I'll try wiring in a relay.
__________________
- Brian Share the Road I often carry 2 carpool passengers and mountain bikes or snowboards/skis over a 4,500 foot elevation difference. Click the graphic above to see my detailed mileage logs. |
|
07-11-2009, 07:32 AM | #16 | |
ULTIMATE
Drives: 09 5dr LB, 2x 08 3dr LB Join Date: Oct 2008
Location: USA, CT
Posts: 13,460
|
Quote:
|
|
07-11-2009, 10:01 AM | #17 |
Steals terrorist's lunch
Drives: 2007 Yaris Liftback Join Date: Mar 2007
Location: Reno, Nevada, USA
Posts: 1,299
|
I thought of the same based on the diagram you attached but pin 5 isn't used in the ACC cut relay's socket. It's an empty space.
__________________
- Brian Share the Road I often carry 2 carpool passengers and mountain bikes or snowboards/skis over a 4,500 foot elevation difference. Click the graphic above to see my detailed mileage logs. |
07-11-2009, 11:32 AM | #18 | |
ULTIMATE
Drives: 09 5dr LB, 2x 08 3dr LB Join Date: Oct 2008
Location: USA, CT
Posts: 13,460
|
Quote:
If you put a voltmeter on the power wire, do you actually see it still cut out with the jumper in place (or just sag to below 12V)? Looking at the EWD, with that jumped, power should definitely still be applied to ACC during cranking. |
|
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Installing Trailer Light Harness | vandallen | DIY / Maintenance / Service | 7 | 06-10-2024 10:06 AM |
Indicator relay removal | Yariscoyne | DIY / Maintenance / Service | 9 | 01-07-2011 03:42 PM |
Horn Relay? | MGargano | DIY / Maintenance / Service | 7 | 11-14-2009 06:01 PM |
DRL Relay | andru47 | Willing to Buy by private party | 1 | 01-06-2009 05:47 PM |
F/S Micro Relay for foglights. | 1NZYaris1 | Items for Sale by private party | 7 | 12-29-2008 09:32 AM |