Equalizer Systems Auto-Level Basic Troubleshooting

Basic Trouble Shooting for Auto-Level
For Systems Using Current Controller/Keypad
Control Panel (Keypad)
Often times the keypad is condemned as defective when it is not. The keypad is nothing more
than switches and lights. The keypad communicates with the controller (black box mounted
under and center of vehicle). More often than not, a complaint on the keypad is an issue with the
controller or another item- such as wiring. See the topics below for help in determining the true
issue. Also note that some applications will not allow extension of the jacks if the key is in the
wrong position. Most systems will not allow the extension of the jacks if the key is in the on
position. However, there are some that will only allow extension if the key is on. Also there is a
park brake disable that will deny extension if the park brake is not applied. This park brake
disable is not connected in all applications.
Keypad will not power up
The keypad should power up with the key in the on or off position. There is a power indicator
light next to the power switch that should come on when the power button is pressed. If it does
not then there is a power supply issue or the keypad and/or controller is defective. There could
also be an issue with the harness that connects the keypad to the controller. The keypad receives
its power from (and is turned on) by the controller. There are 4 wires that connect the keypad to
the controller. Often times the keypad will be condemned as it has power and ground measured
to it at the red and black wires. Measure for voltage (there should be voltage across these two
wires regardless of the keypad power button/light or ignition key status) across the red
(12VDC+) and black (12VDC-). The other two wires (green and brown) are data communication
between the keypad and the controller. Do not attempt to measure to or across these two wires
for voltage. Appling voltage + or – to the green or brown wire could damage the keypad or
controller. They may be checked for continuity end to end if the connector is unplugged from the
keypad and the controller.