Celica Forums General Discussion Exterior ECU ground wire?

I'm installing my Apexi autotimer and i'm having some problems with getting it to work. I called Apexi and they helped me out a bit.

I need to find the ECU ground wire. Is it near the o2 wire under the carpet and next to the interior fusebox on the passenger side?
I searched the forum for it and found something for the Celica GTS. Says the ECU ground wire is the black/brown one(closest to ecu).

Not sure what the (closest to ecu) part means.
Can anyone help me out here? Thanks in advance.

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Celica GT(europe version), KKK K04 BorgWarner turbo, wiseco 8.8:1 pistons, crower rods, ACT XT clutch, bigger injectors, engine bore at 13.011"(79.5mm), 30cm/20cm/10cm intercooler, oil cooler, TRD SS, Full Kaminari body kit, Laser twin end pipe, HKS SSQV BOV, dual pillar gauge pod, Defi BF oil temp & EGT gauge, Defi control unit II, Greddy E-manage piggyback ECU, Greddy Profec e-01 boostcontroller, Greddy Oil Catch tank, Apexi Autotimer, TTE wing, 17" mb014 rims, Avon 3 215/40/17 tires, lowboost at 0.6bar(around 8PSI), highboost at 0.8bar(around 11-12PSI).
Dyno's to come...

Bing

Why do you need the ECU grounding wire? If you need to ground the autotimer, just ground it to the frame.

Can't. If I connect the o2sensor wire then I'm forced to ground the autotimer to the ECU ground.

Not sure why, but that's what the manual says. Also, I called apexi and they say it requires to be grounded on ECU ground.