prestige aps620 issue

I  installed a Prestige APS620 in a 2009 Hyundai elantra.  Not my first install, and everything was going pretty smoothly.  I believe the Tach is available in the driver's kick, but I was unable to find it, so I set the RS to voltage.   The car starts OK, the parking lights come on, and then dies after a minute or so.   The diagnostic codes flash twice, indicating "low or no tach".  I reprogrammed the brain for voltage, i.e., reaffirmed it was properly configured, changed setting  to tach and then back again to make sure.  This worked the first time i started the car, subsequent RS activations failed as before.  The car has no transponder, and the car seems to run fine in pit stop mode.   I'm starting to suspect the brain.  

Any guidance would be helpful in locating the Tach and diagnosing the issue.

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Lectric Guy

 Sotrry-  The car is a 2009 Sonata. 

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Lectric Guy

I've heard you could get the tach in the driver's kick on those cars, but I didn't know about it until I did a Kia Optima (pretty much same car) and found a wiring sheet listing the tach wire.

So anyway, I've done dozens and dozens of APS620 installs in a 2007-up Sonatas without trouble.

Do you see there's another setting in the programming, where you can choose "greater than" or "less than" 0.5 volts for the voltage sensing?

Try changing that to the non-default setting, and see if that helps.

I'm thinking that probably with the heater blower on High, maybe the defroster is on (this runs the AC compressor), maybe the car's voltage isn't increasing by the required "greater than .5 volts" and that's why it's shutting down.

Thanks Chris.  Where do you usually grab tach on the Sonatas that you have done?   I've just finished powering down the brain and confirming I have a solid ground.  I'll reaffirm programming & try your suggestion.  I really would prefer Tach to voltage...

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Lectric Guy

Sorry, I was in a hurry and think I left a few words out of my original post!

What I meant to say is that I've installed many, many, APS620s in 2007-2009 Sonatas for dealerships.

All installs were done with voltage sensing, with no tach wire. If I had known tach was available inside the car, I might have hooked it up, but I didn't know and they always worked fine without it anyway.

I usually left the voltage level on the default setting, but some of my co-workers changed it to the other setting on every car.

Thanks for the update and the info Chris.   I tried your voltage setting recommendation and it worked great!   I find the APS620 to be a great product with poor documentation...no real explaination of this voltage setting, the pit stop mode, eliminating chirps, etc., but the product is solid.

The Hyundai  service information identifies the tach wire, which goes to the tach in the dash, in the upper (black) connector (EM11, 33 Pin) in the driver's kick, white wire, pin 28--this appears to bethe wire on the side closest to the firewall and low in the connector.   I measure this to be 7.5Vac, not really varing with engine speed--not certain this is the right wire.  I'll keep looking...

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Lectric Guy

About their instructions and products, I agree. Great product, instructions that a 4 year old could write better.

I even tried contacting Audiovox to see if they were interested in having someone write good manuals for them, but I got nowhere.

They must get lots of products returned as defective, which are really just fine except for poor documentation.

Anyway, your remote starter's tach wire should be "read only," that is, it's only an input, not an output.

You might make a temporary splice to what you think is the tach wire, and try to program it.

If it doesn't program, it's the wrong wire.

If it does program, reset your unit to tach mode and try it out. If it starts and runs, hit the gas and rev the engine way up to see if over-rev protection works as well.

P.S.

techservices.audiovox.com lists your tach wire as white at the PCM under the hood.

bulldogsecurity.com lists it as white or BLACK/ white, at the PCM or instrument cluster.

Chris--Thanks for the info.  

I confirmed that the Tach IS on the black connector as I described earlier.  The Hyundai service info confirms this white wire as the same wire that goes to pin 61 of the 3.3L PCM (or pin 86 of the 2.4L PCM) as identified by the Bulldog website.  The wire also connects to pin 18 of the instrument cluster connector M08-1, the black 20 pin connector on the dash guage cluster for both models.   The Tach is in the Driver's kick, same location for both models;  the white wire in the top black connector, row closest to the firewall.  There are only 3 signals in this row--(From the top going vertically down) blue, gray, two open positions then the white.   Gray is for the sunroof power if equipped.  I connected to this wire and the RS learned the signal, then started under tach control.  It also provides over-rev protection.

Thanks for all your help.

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Lectric Guy