wb02 12v power source

aw11sc · 07-02-2009, 04:49 AM

Hi, I put a wb02 unit in my rear boot near the ECU and I was wondering if anyone can tell me an easy way to perhaps piggy back 12v's off the ECU maybe? Or do I need to run a new relay from the engine bay? Any info or links to how it can be done would be appreciated. I'm sure people need to do it all the time but I can't find info on how (in an aw11 anyway), thanks.

Found this

Is that the fuse box in the engine bay? I couldn't see any wires in mine, just fuses.

So on the ecu there is a wire supplying the voltage? If anyone knows which one ? I just found this page ECU 1990-91 Japan 4A-GZE AE92

Is it the Circuit opening relay G-R FC that i need to use?

toyotaspeed90 · 07-02-2009, 03:16 PM

look up the wiring reference manuals on mr2oc.com...

there are tons of 12V constant and switched wires in the molex....

palos · 07-02-2009, 04:21 PM

Instead of piggy backing off the ECU, the power antenna connection would seem to be an accessible source for power.

mr2tim · 07-03-2009, 10:17 AM

Palos seems to have the right idea. Why makes things hard on the ECU?, it's sooo expensive when it melts.

Going off the antenna harness the red with light-green wire supplies power off the turn-gauges fuse.(7.5amp)

Power is also fed from the Hazard-radio fuse (at 15amps) and uses the light green-w yellow wire.

BTW if you need a ground wire it's the brown which actually grounds behind the ac heater fuse at the passengers feet area, weird huh?

Isn't this Website great?

Tim (mr2tim)

Ahh..what's a molex?

aw11sc · 07-07-2009, 06:53 AM

Thanks for the info tim. I had a quick look when I could but couldn't see a light green with yellow wire so I will check it out with the multi metre tomorrow.

I did start looking into making a new relay or getting into one of the spare engine bay fuses but right now I'll just use this temporarily if it works. The reason being is I thought it I power off the radio unit will it lose power? or does the plug supply a constant 12v?

molex?

toyotaspeed90 · 07-07-2009, 12:26 PM

Quote:

Originally Posted by palos

Instead of piggy backing off the ECU, the power antenna connection would seem to be an accessible source for power.

I wouldn't do that....

1) several aftermarket stereos will turn the antenna off when in CD, AUX, or MP3 mode

2) only T-tops have a power antenna

look on mr2oc.com for year specific wiring diagrams and use one from the molex connector..... it will show you exactly which wires are 12V switched with the COR.

aw11sc · 07-08-2009, 12:55 AM

Yeah found constant 12v on the antenna motor and got the unit powered and working.
O2 logging can commence! Thanks for the info guys.

edit: Moved the unit into the cabin and I'm running it off the cigarette lighter molex connector. I found there was not enough amps in the antenna motor to allow the unit to power up and crank the engine over at the same time.

07-02-2009, 04:49 AM	#1 (permalink)
aw11sc No Skills Join Date: Dec 2008 Posts: 14 Thanks: 0 Thanked 0 Times in 0 Posts iTrader Rating: (0/0% )	wb02 12v power source Hi, I put a wb02 unit in my rear boot near the ECU and I was wondering if anyone can tell me an easy way to perhaps piggy back 12v's off the ECU maybe? Or do I need to run a new relay from the engine bay? Any info or links to how it can be done would be appreciated. I'm sure people need to do it all the time but I can't find info on how (in an aw11 anyway), thanks. Found this Is that the fuse box in the engine bay? I couldn't see any wires in mine, just fuses. So on the ecu there is a wire supplying the voltage? If anyone knows which one ? I just found this page ECU 1990-91 Japan 4A-GZE AE92 Is it the Circuit opening relay G-R FC that i need to use? Last edited by aw11sc; 07-02-2009 at 05:00 AM..

07-03-2009, 10:17 AM	#4 (permalink)
mr2tim SUPERcharZed ToyZ RacZer Join Date: Mar 2008 Location: South Florida Posts: 1,789 Thanks: 8 Thanked 118 Times in 111 Posts My Google Map iTrader Rating: (6/100% )	Antenna power supply-wire ID Palos seems to have the right idea. Why makes things hard on the ECU?, it's sooo expensive when it melts. Going off the antenna harness the red with light-green wire supplies power off the turn-gauges fuse.(7.5amp) Power is also fed from the Hazard-radio fuse (at 15amps) and uses the light green-w yellow wire. BTW if you need a ground wire it's the brown which actually grounds behind the ac heater fuse at the passengers feet area, weird huh? Isn't this Website great? Tim (mr2tim) Ahh..what's a molex? Attached Thumbnails

07-07-2009, 06:53 AM	#5 (permalink)
aw11sc No Skills Join Date: Dec 2008 Posts: 14 Thanks: 0 Thanked 0 Times in 0 Posts iTrader Rating: (0/0% )	Thanks for the info tim. I had a quick look when I could but couldn't see a light green with yellow wire so I will check it out with the multi metre tomorrow. I did start looking into making a new relay or getting into one of the spare engine bay fuses but right now I'll just use this temporarily if it works. The reason being is I thought it I power off the radio unit will it lose power? or does the plug supply a constant 12v? molex? Last edited by aw11sc; 07-07-2009 at 07:31 AM..

07-08-2009, 12:55 AM	#7 (permalink)
aw11sc No Skills Join Date: Dec 2008 Posts: 14 Thanks: 0 Thanked 0 Times in 0 Posts iTrader Rating: (0/0% )	Yeah found constant 12v on the antenna motor and got the unit powered and working. O2 logging can commence! Thanks for the info guys. edit: Moved the unit into the cabin and I'm running it off the cigarette lighter molex connector. I found there was not enough amps in the antenna motor to allow the unit to power up and crank the engine over at the same time. Last edited by aw11sc; 07-09-2009 at 04:09 AM..

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07-02-2009, 03:16 PM	#2 (permalink)
toyotaspeed90 No Skills Join Date: Jun 2006 Location: Bellingham, WA Posts: 2,401 Thanks: 0 Thanked 148 Times in 143 Posts My Google Map iTrader Rating: (0/0% )	look up the wiring reference manuals on mr2oc.com... there are tons of 12V constant and switched wires in the molex....

07-02-2009, 04:21 PM	#3 (permalink)
palos … Join Date: Apr 2009 Posts: 544 Thanks: 0 Thanked 44 Times in 42 Posts iTrader Rating: (0/0% )	Instead of piggy backing off the ECU, the power antenna connection would seem to be an accessible source for power.