318 Electrical System
Once the updated program is loaded and verified to be working correctly the original uploaded file
should be deleted from the PC to avoid future confusion.
J1939 Baud Rate
Starting in 2016, chassis manufacturers increased the J1939 communication data bus baud rate from
250 Kbps to 500 Kbps. If the baud rate is incorrectly set, the chassis may generate multiple and
various fault codes.
If re-programming the system or replacing node 10, the baud rate should be recorded prior to the
work being performed, then checked/adjusted after the work is performed to match the previous
setting. Failure to do so may result in chassis fault codes.
To ensure the baud rate setting is correct and the chassis is communicating with the Labrie multiplex
system, it may be checked and adjusted using the Labrie multiplex display screen. With the engine
running, depress the menu button to access the main menu. Use the directional pad to highlight I/O
STATUS, and press OK.
In the Module I/O Status menu, use the directional pad to highlight J1939, and press OK.
The J1939 screen shows the values that Labrie’s multiplex system is sampling from the chassis
multiplex system. Verify that these systems are correctly communicating by accelerating the engine;
the Engine RPM value on the Labrie J1939 screen should match the chassis dash tachometer.
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