avital 4x03 remote start, 98 lexus gs400

An ignition wire will remain powered while starting the car. Acc will drop then come back. What are you using to bypass the chip key ? You can try placing a key in the ignition cylinder ( just in not turning it on) and try the remote start. If it works your bypass isn't working (if you have one) Now that you have the remote start powered correctly you can try the take over and make sure the car stays running. That will verify the rest of your install is goodIf i Can't Install it    I Don't need it   Joe

I've done the take over mode once I got it working. That worked, also I don't have any kind of bypass hooked up. Is there one I need that I'm not aware of? Now after I tried to change something in the program mode, the remote start isn't working again..?? So aggravating!

You should have a chip in your key. You will need a bypass to simulate the key. I personally like idatalink products. As far as the remote start not working what is it doing ? What did you change ?If i Can't Install it    I Don't need it   Joe

Is that the fix for the 6 second crank an no start problem? An what exactly is the name of what I need? Well I was trying to change the unlock from 1 pulse to a 2 pulse setting. Followed the manual but wasn't sure if it even changed it. After that I tried remote start- no go, not even take over mode.

The car won't start without seeing a valid key signal. You can go to idatalinks web site put in your car and it will show you what works with it. As far as not starting now I'm not sure what you could have changed to make it not start. To change the unlock pulses you should be on menu 1 ( 1 horn honk or led flash). Option 5. To get to option 5 you need to press and release the programming button 5 times then once more and hold the button down. (the horn should beep 5 times and the led should flash 5 times) then use the remotes lock and unlock buttons to change options. 1 beep/led flash for one, 2 beeps/led flashes for two and so on. Recheck all your connections make sure nothing came looseIf i Can't Install it    I Don't need it   Joe

I'll check out that website. I figured out the no start. I went to menu 2 instead of menu 1 an changed the activation input pulse to 3. That's fixed now. now I need to figure out the door unlock situation. I have the green unlock wire (-) run to the driver's door, which is why I changed setting to 2 pulse unlock. But right now, with car running, no unlock. ?? Do I have to install a relay?

Still need to figure out my unlock setup. I have the green (-) unlock wire running from the remote start module to my drivers door. In the door I'm running two wires with diodes to the specified factory wires. Nothing happening?? Any advice would be appreciated...

A few thoughts.  The Avital 4113 is a one button remote start system.  This is not the ideal system to use on a Toyota / Lexus

vehicle as they turn off their RKE FOB's while the engine is running.  Also remember that the Avital 4113 unlock feature willonly work while the engine is running under a remote start.  Just pressing the Avital button for 1/2 second will not unlock thedoors if the vehicle was not already running from a remote start up. 

Probably just a typo but the Avital 4113 Unlock output wire is Blue, not Green.

Check to ensure that the two diodes have their bands towards the R/S unit.  Verify the correct wires in the door and a quality

solder connection.  It is possible that the R/S's (-) 200mA Unlock output is not "strong" enough to actuate the unlock.  You cantest and verify everything by unplugging the Avitals' 3 Pin Lock harness and briefly jumping the Blue unlock wire to a solidchassis ground.  With the unlock connections in the Drivers door you might have to program the Avital 4113 to a double unlockpulse as a single pulse will only unlock the Drivers door due to the vehicles "progressive unlock" feature.

Their appears to be conflicting info on the vehicles lock system.  ReadyRemote ( DEI ) suggests that TechTip 1070 is necessary

for the 1998 while Bulldog and Audiovox don't.  The 1999 LS400 is listed in TechTip 1070 but not the 1998 LS400.

ReadyRemote

Power Unlock     Pink/Green (key unlock) and Gray (lock detection)  TecDoc1070  Driver Door ECU, gray 18 pin plug, pins 5 and 3

Bulldog Security

Power Unlock       GREEN/ BLACK  (-)  NEGATIVE TRIGGER

Audiovox

POWER UNLOCK      GREEN/ BLACK (TYPE B)        @ ECU, INSIDE PASSENGER DOOR 

P.S.  Please ignore the above paragraph.  Somehow I thought it was a LS400 and not the GS400 you mentioned.    Thanks to HarryHarris for catching my error.

Soldering is fun!

Finally got to mess with it, an no that wasn't a misprint..I don't know what I was thinking at the time. The unlock wire is the blue wire. I have it on double pulse setting. I switched wires to correct color, an checked to make sure wire is getting signal. When I manually unlocked the driver's door, the remote (with car running) would unlock all other doors. With drivers door locked it would do nothing..I also changed the setting on my lexus to unlock all doors with one pulse from factory key remote. Still the same

Almost sounds like you're not on the right Gray Lock Detection wire.  Double check this wire & connection. 

Maybe a bad diode on the branch going to the Grey wire?

Might be worth a try with a chassis ground double pulse manually applied directly to the Blue Unlock wire in the (unplugged) Avital lock harness.

Here is a link to another diagram, similar to the DEI 1070 document : http://documents.audiovox.com/710624.pdf

Soldering is fun!