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Service Tips
Email NetworkDo you have a service tip you would like to share? Let us know if there is information you find particularly helpful. If there is something you would like us to cover in this section, send us a message so we may share it with our other customers. Your input is always appreciated!
VISION TURN SIGNAL FAILURE
Vision school buses that are experiencing turn signal malfunctions can be rewired with a conventional relay and flasher system to avoid replacement of the multiplex module. The following parts and schematic can be used to make the repair. If you have any questions please call our Technical Service Department at 1-800-825-8273.
Parts Required: One 20-amp Fuse, Two Relays P/N 30-13317, and Flasher P/N 1868025.
Parts Required: One 20-amp Fuse, Two Relays P/N 30-13317, and Flasher P/N 1868025.
VISION HORN FAILURE
Buses that have experienced horn failure can wire in a conventional relay circuit to avoid replacing the multiplex module. If it has been determined that no out put from the module to the horns on pin 14 connector B1 is present and pin 9 on connector B2 is grounding the circuit when the horn button is pressed use the following parts and schematic to make the repair. I you have any questions call our technical service department at 1-800-825-8273.
WIPER DOESN'T TURN OFF
If the right side wiper continues to run after the wipers have been turned off on a Vision or All American bus, gain access to the wiper switch and remove the heat shrink around the connector to examine the wiring. Look for the yellow low-speed wire diode intruding into the insulation on the green park request wire. If there is damage, the wire needs to be repaired or the switch needs replaced.
FAST IDLE INOPERATIVE
If the fast idle is inoperative, check to make sure the fast idle request wire is correctly located in connector C800 (EJ1 Cat connector number). The orange wire EJ140 may be incorrectly labeled EJ123 and installed in the wrong pin location of 23. If this condition is present verify the cruise request signal with an ohm meter checking for ground when fast idle is engaged. After circuit has been verified, remove the wire and pin from location 23 and install in pin location 40. Please call Jon or Kent in the Technical Support Department at 1-800-825-8273 with any questions.
ENGINE BLOCK HEATER
If your vehicle is equipped with a block heater, keep in mind that it will work best on an engine that is already warm.
CROSSING ARMS
On school buses with crossing control arms, if the base needs to be serviced internally, be sure to reseal the cover to keep out moisture and dirt.