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djdobbins1 · 10-06-2013, 06:04 AM

When my coach is sitting with the ignition switch off and the key removed, the row of color warning lights all flash continuously. I turning off the chassis master switch for several minutes and the lights stop flashing, but they started flashing again when I turned the chassis switch back on. Any trouble shooting ideas?

vtbigdog · 10-07-2013, 01:57 PM

Guessing here, but I'd say you either have a chafed wire under the dash or a bad ground in the same location. If you wiggle the wires does it go away?

Pelledan · 10-07-2013, 02:16 PM

If your chassis is Freightliner, this is copied from TSB 54-12 dated June, 2004: MC refers to Message Center. The fix appears to be involved and probably best left to Freightliner to repair.

Dan

Problem—The MC Lights Scroll or Chase in a Circular Pattern With the Ignition Key in the OFF Position
Diagnostic Check Remedy
Measure for 10-12 v at pin 8 of the MC
15-pin connector (circuit 339 A).
NOTE: Be sure to measure for 10-12 v
with the key in the OFF position. Nothing
less than 10-12 v is acceptable.
If 10-12 v is not measured, unplug the VDC 10-pin connector and measure for
10-12 v at pin G (circuit 339 A). If 10-12 v is measured, the VDC is faulty.
If 10-12 v is not measured at pin G of the VDC 10-pin connector with it
unplugged, then unplug the MC 15-pin connector. Check continuity between
pin 8 (circuit 339 A) of the 15-pin connector and pin G (circuit 339 A) of the
10-pin connector. If continuity is read, then check for continuity to ground. If
the circuit is grounded, install a new circuit 339 A wire between the VDC and
the MC. If the wire is not grounded, but there still is no voltage measured at
either connector when connected, unplug the 15-pin connector and remove
wire 339 A from the pin 8 cavity. Reconnect the connector and measure for 12

v in the empty pin 8 cavity. If 10-12 v is not measured, replace the MC.

EngineerMike · 10-07-2013, 02:30 PM

DJ- The lights are driven (on your model year) by the Medallion brand VDC, or Vehicle Data Center gizmo that is attached to the rear facing side of the rear battery bulkhead ahead of your air cleaner.
The action you describe is analogous to the later model Actia gauge elements cycling endlessly if they have lost input signal. I believe Medallian bought the system (both ends, the VDC & idiot light cluster product lines) from its original mfgr, and offers service diagnostic assistance as well as service parts. If you cannot follow the cabling coming out the back of the light cluster & find a connector that has become partially or wholly unseated, broken or chaffed wire, etc: Medallian in Muskegon, MI, try Tom at 800 828-8127 X358 or ask for service & let us know what happens.

EngineerMike · 02-17-2014, 12:05 PM

Dan- did you ever resolve the "message center" lights flashing w/KeyOff?

djdobbins1 · 02-18-2014, 08:20 AM

Quote:

Originally Posted by EngineerMike

Dan- did you ever resolve the "message center" lights flashing w/KeyOff?

No, I have not found the problem yet. I have disconnected, inspected and reconnected all connectors I can find around the VDC and the the message center. I did not find any problems. I also have the fuel gauge inop problem and will continue to trouble shoot and report findings. Thanks for all of your help with both systems.