2009? RXV brakes will not disengage

55 chevy · 12-29-2021, 04:11 PM

First, I cannot verify year, serial number lookup (serial not found) My serial Number is 5033787.
I think it is a 2009 via date code on tag. My EZGO RXV brakes will not disengage, electric brake tested 25.8 ohms, brakes lights stay on, battery solenoid clicks when key to forward, positive continuity through the run plug, batteries charged to 45.8 volts, EZGO charger has two sort red blinks. Any help where to look next would be greatly appreciated. Thanks in Advance

ojo · 12-29-2021, 04:39 PM

My serial of a '09 starts with 506... there is a tag behind driver side front wheel showing a date code. The pack voltage you mentioned is much too low, below 10% SOC! Fully charged the batteries should read at least 50.9v. With a volt meter, check each individual battery. There could be one bad? The ohms of the parking brake is good.

55 chevy · 12-29-2021, 04:42 PM

would the low voltage cause no movement. Just my thought process says you would not get very far if this is the case.

ojo · 12-29-2021, 05:05 PM

The RXV is a 48v cart and the controller is expecting this voltage. On start up, it's performing a self test of various things and If something out of specs, the controller won't disengage the magnetic parking brake. Red led from charger probably indicating the low voltage ( too low to kick in ). You could charge each single battery with a 12v car charger to bring them up.

55 chevy · 12-29-2021, 05:10 PM

Thanks will try charging individually

cartdoc1969 · 12-29-2021, 06:44 PM

Quote:

Originally Posted by 55 chevy

would the low voltage cause no movement. Just my thought process says you would not get very far if this is the case.

A 2009 would have a Danaher controller and I believe they cut out at 20% SOC. Charge up the pack and I bet it works.

55 chevy · 12-30-2021, 03:11 PM

got all batteries over 12.5 volts, still same results.

sthreatt · 12-30-2021, 04:00 PM

With a volt ohm meter, check for power on the plug at the motor brake. Connect the negative lead of the meter to battery ground. With the cart switched on you should read battery pack voltage going to the motor brake. If you don't, then you likely have a bad sonic weld in the harness.

Ryokuro · 12-30-2021, 04:19 PM

I can confirm that you do have a 2009. Have you tried doing this from the troubleshooting guide?

ojo · 12-30-2021, 04:35 PM

Here's the complete Danaher Troubleshooting Guide:

12-29-2021, 04:11 PM	#1
55 chevy Not Yet Wild Join Date: Dec 2021 Posts: 13	2009? RXV brakes will not disengage First, I cannot verify year, serial number lookup (serial not found) My serial Number is 5033787. I think it is a 2009 via date code on tag. My EZGO RXV brakes will not disengage, electric brake tested 25.8 ohms, brakes lights stay on, battery solenoid clicks when key to forward, positive continuity through the run plug, batteries charged to 45.8 volts, EZGO charger has two sort red blinks. Any help where to look next would be greatly appreciated. Thanks in Advance
55 chevy Not Yet Wild Join Date: Dec 2021 Posts: 13

12-29-2021, 04:39 PM	#2
ojo Gone Wild Join Date: Sep 2020 Location: Germany Posts: 1,999	Re: 2009? RXV brakes will not disengage My serial of a '09 starts with 506... there is a tag behind driver side front wheel showing a date code. The pack voltage you mentioned is much too low, below 10% SOC! Fully charged the batteries should read at least 50.9v. With a volt meter, check each individual battery. There could be one bad? The ohms of the parking brake is good.

12-29-2021, 04:42 PM	#3
55 chevy Not Yet Wild Join Date: Dec 2021 Posts: 13	Re: 2009? RXV brakes will not disengage would the low voltage cause no movement. Just my thought process says you would not get very far if this is the case.
55 chevy Not Yet Wild Join Date: Dec 2021 Posts: 13

12-29-2021, 05:05 PM	#4
ojo Gone Wild Join Date: Sep 2020 Location: Germany Posts: 1,999	Re: 2009? RXV brakes will not disengage The RXV is a 48v cart and the controller is expecting this voltage. On start up, it's performing a self test of various things and If something out of specs, the controller won't disengage the magnetic parking brake. Red led from charger probably indicating the low voltage ( too low to kick in ). You could charge each single battery with a 12v car charger to bring them up.

12-29-2021, 05:10 PM	#5
55 chevy Not Yet Wild Join Date: Dec 2021 Posts: 13	Re: 2009? RXV brakes will not disengage Thanks will try charging individually
55 chevy Not Yet Wild Join Date: Dec 2021 Posts: 13

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12-30-2021, 03:11 PM	#7
55 chevy Not Yet Wild Join Date: Dec 2021 Posts: 13	Re: 2009? RXV brakes will not disengage got all batteries over 12.5 volts, still same results.
55 chevy Not Yet Wild Join Date: Dec 2021 Posts: 13

12-30-2021, 04:00 PM	#8
sthreatt Gone Wild Join Date: Jul 2015 Location: Central South Carolina Posts: 939	Re: 2009? RXV brakes will not disengage With a volt ohm meter, check for power on the plug at the motor brake. Connect the negative lead of the meter to battery ground. With the cart switched on you should read battery pack voltage going to the motor brake. If you don't, then you likely have a bad sonic weld in the harness.

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