Service Bulletin No. 457
MODEL

TYPE

J4500
SUBJECT

SECTION/GROUP

Field Change Program

DATE

7-Electrical

Dec. 29, 2017

PARKER MULTIPLEX SYSTEM LOW-POWER SLEEP FUNCTION

CONDITIONS

Customer Complaint:
Motor Coach Industries ("MCI") has become aware that some customers have experienced coach battery
drain due to the Parker multiplex system not initiating the low-power sleep function when the coach is parked
and the main battery disconnect is not turned to the OFF position.

Cause:
Incorrect programming of the multiplex controller.

Corrective Action:
MCI will remedy the affected coaches at no cost to owners by updating the multiplex program. However, proper
repairs will require the use of specialized equipment and therefore MCI strongly urges owners of the MY2018
J4500 coaches listed in this bulletin to make an appointment as soon as possible by calling the MCI Customer
Service Line at 1-800-241-2947, in order to have the repair performed by trained technicians who have the
necessary equipment.

68300

68383 to 68386

68394

68396

68400

68406 to 68409

68422 to 68425

68427 to 68432

68440

68453 to 68467

68469 to 68482

68485 to 68502

Service Procedure:

Read this entire procedure before beginning work.
Use Safe Shop Practices At All Times.
1. Turn the main battery disconnect switch to the OFF position.
2. Chock both sides of the tires.
3. Connect a laptop, equipped with the latest version of VMM Software 7, and download the new control logic.
4. Using the VMM software, query the modules again and verify that the logic revision has been updated to
the latest version.

Service Bulletin No. 457
Date Dec. 29, 2017

Page 2

5. Turn the main battery disconnect switch to the ON position.
6. Position the ignition switch to the OFF position.
7. Exit the coach cabin and close the entrance door.
8. Visually inspect the modules in the front and rear junction boxes to ensure the diagnostic LED’s are
illuminated and/or flashing.

Allow thirty ( 30 ) minutes to expire prior to visually re-inspecting the modules.
9. After thirty ( 30 ) minutes, visually re-inspect the modules in the front and rear junction boxes, for all
diagnostic LED activity to be extinguished indicating low-power sleep mode function.
10. Turn the main battery disconnect switch to the OFF position.
Procedure Complete.

Mail or fax the completed limited warranty claim form and verification form to MCI’s warranty department, or photocopy and mail to:
MCI Fleet Support
Attn: Warranty Department
7001 Universal Coach Drive
Louisville, KY 40258
Fax Number 1-800-360-8886

to receive credit for the hours used to complete this task. Contact the MCI Fleet Support Technical Center at
1-800-241-2947 for any further information.

Field Change Program Conditions:
Specialized programming equipment is required to perform this retrofit.
A labor allowance of 0.2 hours will be granted for the procedure described in this bulletin on applicable J4500
Series coaches.
This labor allowance will be credited to your MCI Fleet Support Parts Account on receipt of the attached “MCI Field
Change Program Verification Form” and a “Warranty Claim Form” as detailed in your Owner Warranty manual to
MCI’s Warranty department. A “MCI Field Change Program Verification Form” needs to be submitted for each VIN
affected. Photocopy the attached “MCI Field Change Program Verification Form” as required for the number of
affected coaches in your fleet.
This program will end on July 20, 2018.
Motor Coach apologizes for any inconvenience resulting from this campaign, but urges you to implement this
change as soon as possible.
Sincerely,
Motor Coach Industries

MCI FIELD CHANGE PROGRAM (FCP) VERIFICATION
CONTACT INFORMATION
CUSTOMER NAME:
____________________________________________________
(PLEASE PRINT

FCP INFORMATION – ONE FORM PER UNIT
FCP#: _________

Coach Model ___________

COACH SERIAL #:
(At least the last 5 digits)

Model Year _____________

DATE COMPLETED __

/ __ /__

MILEAGE:
IMPORTANT: TO RECEIVE CREDIT FOR ANY ALLOWABLE LABOR CHARGES, THIS VERIFICATION FORM
MUST BE RETURNED TO MCI UPON COMPLETION OF THE FCP.
SUBMITTED BY: (Please Print)
________________________________________________________________

DATE

__ / __ /__

TITLE: (Please Print) ____________________________________________

SIGNATURE:
________________________________________________________________

COMMENTS:

F A X T O : 800-360-8886
MAILING ADDRESS:
MOTOR COACH INDUSTRIES
ATTN: WARRANTY DEPT.
7001 UNIVERSAL COACH DRIVE
LOUISVILLE, KY 40258

MCI part # 03-15-7738C