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Go to the link Kenbu sent you and scroll down the page, "old cajun" has it all laid out
John Deere 997 Seat Safety Not Working
- Thread starter jshep1102
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The screenshots of ways to check the timer module are for a type different than mine. It shows a square 4 pin plug in a 2x2 configuration. Mine is a 1x4 flat configuration. I attached pics of the 2 different styles I've found.
I was wishing Kenbu's pic showed wire colors so I could check to see if mine had the same colors.
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StarTech
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Here is a hint from the 777, 797 that uses the same delay module.
1. A delay module might be installed in place of wire 477 yellow. The
delay module prevents errant engine shut-off caused by the seat switch
being momentarily disengaged due to operating on very rough terrain.
if this is correct and the Z997 is using the wiring numbers then you can remove the delay module and install a test jumper to see if the module is the problem area. Just make sure you jump the right two wires. There will be 12v on one of the wires which what activates the module which in turn activates the magneto stop and keeps the fuel solenoid active during about a 2 sec delay. This circuit controls the magneto stop relay and the fuel solenoid on the 777, 797 mower.
But as I said I don't have the SM for the International version of the Z997 at hand. So this is just a guess.
1. A delay module might be installed in place of wire 477 yellow. The
delay module prevents errant engine shut-off caused by the seat switch
being momentarily disengaged due to operating on very rough terrain.
if this is correct and the Z997 is using the wiring numbers then you can remove the delay module and install a test jumper to see if the module is the problem area. Just make sure you jump the right two wires. There will be 12v on one of the wires which what activates the module which in turn activates the magneto stop and keeps the fuel solenoid active during about a 2 sec delay. This circuit controls the magneto stop relay and the fuel solenoid on the 777, 797 mower.
But as I said I don't have the SM for the International version of the Z997 at hand. So this is just a guess.
If it is a failed delay module, it has failed in the "energized" condition and is keeping the fuel solenoid and/or magneto stop from killing the engine when the operator leaves the seat for >2sec. It's a rainy day today so I'll have to do some more testing tomorrow afternoon when the rain is supposed to stop. Thanks for the help Star!
masterchief davis
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its probably the buttons under the seat not adjusted for making contact with seat raised try pushing the buttons with seat raised,
StarTech
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This system uses 12 vdc thru the seat switch and the time delay to activate a relay and the fuel solenoid so the engine will start and run. It must become an open circuit to disengage the relay and to deactivate the fuel solenoid. This means the seat switch is NO and not a NC switch.
Correct, switch is open with nobody in the seat. It closes with relatively light pressure on the seat so i'm confident this switch is not the issue.
I stopped at 2 local shops today trying to find an electrical schematic to aid in troubleshooting but neither could access it. The closest john deere dealer is over an hour away.
StarTech
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I emailed one of my JD dealers to see if I can get a diagram or at least the correct tech manual PN so I can search for it on the net.
OK, the rain finally stopped and I got to dig a little deeper. I found a picture of a 2x2 pin configuration delay module that showed wire colors and I checked resistance reading that Kenbu posted on my 1x4 pin configuration delay module. They were very similar readings as shown in the attached pic so I don't think I have a bad delay module. More digging ensued.
Aha!, I found some more wire modification shenanigans put in place by a previous owner. Under the control panel, i found another jumper that picked up power off of one lead coming from to the ignition switch and fed it to a solenoid on the hydraulics pump. The other leg of the plug at the solenoid was jumpered to a wire on the PTO switch. Again, no idea why someone put this and the other jumper (delay module to fuel cutoff solenoid) in place. Not sure if the previous owner was a genius fixing a problem I haven't found yet or a hack just finding power/ground somewhere and using it willy-nilly to get something to work rather than fixing what was really wrong. Use of these blue piggyback splice connectors probably eliminates the genius probability.
I think I found the service manual on Ebay for this mower that should have schematics I can use to figure it out. I'll write the seller to confirm it covers my particular mower.
The saga continues...!
Aha!, I found some more wire modification shenanigans put in place by a previous owner. Under the control panel, i found another jumper that picked up power off of one lead coming from to the ignition switch and fed it to a solenoid on the hydraulics pump. The other leg of the plug at the solenoid was jumpered to a wire on the PTO switch. Again, no idea why someone put this and the other jumper (delay module to fuel cutoff solenoid) in place. Not sure if the previous owner was a genius fixing a problem I haven't found yet or a hack just finding power/ground somewhere and using it willy-nilly to get something to work rather than fixing what was really wrong. Use of these blue piggyback splice connectors probably eliminates the genius probability.
I think I found the service manual on Ebay for this mower that should have schematics I can use to figure it out. I'll write the seller to confirm it covers my particular mower.
The saga continues...!
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oops, didn't see your post before I ordered the ebay service manual. It is TM2259 and it says it covers s/n 010001- up. It was only $25 (digital copy) so I'm not out much if I ordered the wrong one. Thanks for all your help.