check the connection of over the mast cable and ohm out each of the wire. i am pretty sure is the over the mast cable bad.

Intellispeed manager not communicating to vehicle manager

MAKE SURE ALL EPROM STUFF AND FIRMWARE IS SEATED WELL. CHEXK THE TWO TINY FUSES ON VM FU 20 AND FU21

Check heart beat on I M. IF STEADY REPLACE IT AND FIRMWARE. IF OFF CH3CK THE CABLE BETWEEN IT AND VM

The Vehicle Manager has not received a message over the
BUS+/BUS- communication lines, containing height and
weight information in over 0.1 seconds from the
intellispeed™ Manager.


1. Check the "heartbeat" LED on intellispeed™ Manager. If on steady,
replace the intellispeed™ Manager and firmware. If light is off, then
check the cable between the intellispeed™ Manager and the Vehicle
Manager (JPY5 to JPS16) for continuity or other defects.
If the intellispeed Manager is replaced, be sure to run Configure
Mode then Learn Mode (See "Code A9" on page 7-102 for more
information).
1. Disconnect the POD at JPC18. If the error code no longer occurs,
the problem is in the cable between the Carriage Manager and the
POD or within the POD itself.
2. The Vehicle Manager Distribution Board may not be functioning
properly. Observe the code and troubleshoot. Replace the Vehicle
Manager Distribution Board.
3. The Vehicle Manager VFC Card may not be functioning properly.
Replace the Vehicle Manager VFC Card and firmware.
NOTE: On truck with software version 4.0 and up, FU20 and FU21 are
located within the Vehicle Manager enclosure, near the ribbon
connector on the distribution board. To check or change these
fuses, the Vehicle Manager cover must be removed. Observe the
cautions shown above.
For FU20 and FU21 locations in trucks with software versions
below 4.0, See Appendix B, page B-41.
4. If code is intermittent, check for shorts to frame per page 7-12.
5. Check the CAN BUS Fuses FU20 and FU21.