Quote:
Originally Posted by SVXdc
But I am surprised it needs +12V Battery, when a normal ASWC doesn't. I wonder what they're doing with that? (in what situation would you want the RF SWCs to work while your key (+12V ACC) is off?). The module shouldn't be needing constant power to maintain memory (normal ASWCs don't).
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Apparently, +12V battery is needed to maintain the pairing between the RF transmitter and receiver - if the power to the module is disconnected, they have to be paired again by pressing "volume up" on the transmitter. I have a feeling that the OESWC is actually a simplified version of ASWC, at least it looks like there is no non-volatile memory in the unit, as all the commands are pre-set and static for all OEM HUs and can be stored in ROM. And there is no usb port (the place where it is supposed to be is glued shut).
When the module gets the +12 acc power, it starts looking for the HU and apparently can't find it. The LED on the module lights up when the buttons on the remote are pressed, but the resistance between ground and any of the SWC pins doesn't change when I press the buttons (it's a poor test, I know - if the unit sends only short commands, they may be too short to be detected by my cheap multimeter). I've checked the resistance between SWC1 and SWC2 on the HU and it was infinity - which leaves me with not too many other things to try.
I'll take a look when I get home and try to simulate specific commands, but I do remember the HU reacting when I shorted one of the SWC pins to the ground (I think it was the "Seek+" command), so at least it is responding.
Quote:
Originally Posted by SVXdc
The module is looking for particular voltages on the wires that connect to the HU. It may also be looking at which pins were used on the 12-pin harness to determine the HU brand (potentially one of several different OEM types -- Toyota, GM, Chrysler, etc.).
I'm wondering if your choosing the OESWC-8113H is throwing off that logic
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Judging by the looks, the only difference between Toyota harnesses is that 8113H draws power from a 20pin connector and 1761H from a 10pin connector, the same as the one on the FT HU.
The other pair of 20pin connectors, where the SWC pins are, are identical on both harnesses, and the remaining part with a 12-pin module connector is also the same.
Anyway, thank you for the hints and the encouragement -- at least now I have a plan!
PS: Do I understand correctly that ASWC-1 can be manually forced to use a specific set of commands and not try to do the whole "auto-detect" thing with a FT HU? If I won't be able to make the OESWC module work, then at least I will have another option!