I have a crown sp3200 series order picker. When the unit is turned on, it never reaches self test. The display module power light comes on, and the error light flashes continually... the display does not come in and no other lights in the display come on. The steer module shows power, and the error light is illuminated, but not flashing.

Unit has no lift or travel. Have unplugged and cleaned every connection I can find.... all fuses and relays appear good. Suspect steer module and/or display module are bad, but have no way to verify.

Any thoughts would be appreciated.