Genie GR-20:
no power

Hi, I have a 2010 Runabout gr 20. I put new batteries in it and a new ecu. I get 2 codes 01 and 02 on the basket controller, but the ecu doesn't light up. I have no power and nothing is working. Any ideas.
  • Posted 24 Dec 2021 01:52
  • Discussion started by Andy1
  • Virginia, United States
Showing items 1 - 10 of 10 results.
hi andy,
according to the A5 and 30 code you have software revision A5 and the function code is 30 which indicates that by default -non-slab option, -motion alarm, -lift/drive cutout is enabled.
i figured you might find some wiring issues, hopefully you replaced the harness?
repairing it may or may not work if there is any damage elsewhere in the harness.
that quick flash of the 01 is probably normal on startup, it may do that until it sees the ecm configuration and passes it. as long as the code goes out the ecm should be functional.
as for the alarm sounding on every function? that is what it's supposed to do, it's part of the motion alarm function while operating the unit.
If you're still not getting any motor operation but the indicators are sounding when you activate a function you should go to the motor circuit and check to see if it is being commanded to turn on. also check the motor brushes etc and make sure there is no problems with those, wear, excessive carbon buildup, etc.
if you've been messing with the relays and have moved any connections make sure you put them back the way they were. get the service book from genie's website and make sure it is number 84700 version. There are diagrams in it that will show you the wiring connections for each relay and everything else.
  • Posted 17 Jan 2022 23:52
  • Reply by swoop223
  • North Carolina, United States
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Update. Found broken wires in the wiring going to the controller in the basket. The lights come on and the alarm sounds with every function, but the motor doesn't come on. I still get a quick flash of a 01 code. When I put the new ecm on it I get the same. Also when I use the up and down on the ground switch I get A5 and 30 come up on the ecm.
  • Posted 17 Jan 2022 11:29
  • Reply by Andy1
  • Virginia, United States
Back to the drawing board. Replaced relays and that did not change. I guess I'll start chasing wires.
  • Posted 2 Jan 2022 04:18
  • Reply by Andy1
  • Virginia, United States
i'd be careful just moving wires on those relays around, you may get something to work but then cause something else to not work. If you've moved wires and got the ecm to power on then you may have discovered the problem. Go back and trace out that power circuit and find the bad path.
check those relays
check that key switch
check the power supply wires to the ecm (and ground)
one is open, it should be obvious
  • Posted 29 Dec 2021 02:58
  • Reply by swoop223
  • North Carolina, United States
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I was able to move a couple wires around on the relays and get the ecm to come on and the lights to come on. Still get the 02 code. Think I will replace the relays and go from there.
  • Posted 28 Dec 2021 11:47
  • Reply by Andy1
  • Virginia, United States
ok no problem, i was looking at the right service book then. You can view it too and even download it from genie if you like. Their literature is free to the public.
But there isn't much to understand different than any other DC powered system.
12, 24, the concept is the same, just understanding how this one or most of these work isn't too difficult. You have a 24v system but it is divided into 12 and 24v. The 24v circuits are usually reserved for the drive power circuit and pump motor power circuit, the big cables. Now the lower voltages 12 or even 5 in some cases is dedicated to the control circuits, the small wiring. You may see a 24v reading on certain circuits like at the keyswitch but having the service book and schematics helps there. And yes you can use the B- as a ground test point, you can use frame ground too but using the B- is better. Checking for voltages is fine but you may also want to check continuity/resistance through the wire you're checking too to make sure you do not have any bad connections like a bad crimp on a terminal or a broken wire.
  • Posted 27 Dec 2021 13:04
  • Modified 27 Dec 2021 13:06 by poster
  • Reply by swoop223
  • North Carolina, United States
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The model # is GR 20 and the serial# GR10-16323. The part # on the ecm' s are the same.
I'm good with 12 volt systems but the 24 volt is throwing me off. I've been hooking my test light to the b- on the controller to test what is hot. Thanks
  • Posted 27 Dec 2021 12:27
  • Reply by Andy1
  • Virginia, United States
ok well first off i need the full model and serial number before i can give any decent help on this.
Other than the usual checks for good connections, make sure no fuses are blown.
One suggestion is to check the power at the CR48 relay, this relay turns on when you pull out the estop and have the key turned on, this relay powers on the ecm and platform box (depending on what positon the key switch is turned, the ecm should power on either way. According to the diagram in the service book it is the relay located closest to the tilt sensor. It may be labeled as such.
Check your estop switches and mounts for those switches and make sure they are seated properly and the switches are actually turning on/off like they should. Also make sure all your connections from the key switch are good, wiring to the ecm as well. Check the red wire (terminal 2 & 4 jumpered), from the key switch to the CR48 relay and make sure there is power on it at the ecm connection.
Also there is an orange wire (terminal 1) from the key switch to the ecm to check the same way. Terminal B and B1 (jumpered) from the key switch supply power to the estop switch #2 terminal, this supplies power to the 7Amp motor controller circuit breaker terminal. Terminal 3 is for the up/down control so you can ignore that for now.

If you still have the old ecm check the part number on it to the one you currently have installed and make sure they are the same part number.
  • Posted 27 Dec 2021 08:13
  • Modified 27 Dec 2021 08:14 by poster
  • Reply by swoop223
  • North Carolina, United States
You've been swooped!
swoop223@gmail.com
Thanks for the replay. I'll take a look and see what I have, but I have no power it seems to the ecm. So basically I can't do anything with the ecm or the controller
  • Posted 27 Dec 2021 06:45
  • Reply by Andy1
  • Virginia, United States
although knowing the year mfg might be helpful to some degree having a full model and serial number off of the data plate would be better.
But with that said i can look up some general info that may or may not be accurate. Also the revision letter makes a difference too. From what i can find after looking through the different literature this one may be a Rev C unit.
The codes it is displaying indicates 01 - Internal ECM error - EPROM not programmed, replace ECM.
The 02 indicates ECM/Platform communication error. - Malfunctioning control cable OR malfunctioning platform controls. - troubleshoot control cable OR troubleshoot platform controls.

My guess is you did not program the ECM when you installed it, or got an incorrect revision. (if you look on the old ECM it should have a part number on it and that number should have been what you ordered). All genie parts have part numbers on them. Also when ordering ECM's genie always asks for specific information like model, serial and revision number and most likely the software revision level currently.
When you install a new ECM you always have to program it on startup, i'm pretty sure it will force you to do this which is what it is probably attempting to do.
There is a proceedure in the service literature that instructs how to change the software configuration on page 4-9 (assuming i am looking at the correct manual for your machine). If you follow that it should allow you to check and reset the correct configuration.
When you get new ECM's they have a general base setup that may or may not be correct for your machine, it is up to the installer to make sure the configuration is correct for THAT machine and do the proper calibrations for lift and travel before putting the machine in service.
You can go on genie's website and get the service literature for your machine by serial number which is only obtainable by serial number lookup method.
There was a change in the ECM's so having the correct literature will be the only way you can get the right info to get past this.
  • Posted 26 Dec 2021 02:35
  • Modified 26 Dec 2021 02:38 by poster
  • Reply by swoop223
  • North Carolina, United States
You've been swooped!
swoop223@gmail.com

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