BMTW-SVN01F-EN 199
Chapter 10
BCU Operation and
Communication Status
Light emitting diodes (LEDs) on the BCU indicate both operation status
of the BCU and communication status with UCMs. Operation status of
the BCU is indicated by a seven-segment LED display located at U11 on
the BCU logic board. Communication status with UCMs is indicated by a
row of green, yellow, and red LEDs, identified by designators beginning
with CR. These LEDs are located to the left of the TB2 terminal block on
the BCU logic board. See Figure 93 on page 200 for locations of both types
of LEDs.
The information provided by the LEDs is explained in the following
sections:
• “LED Indicators for BCU Communication Status” on page 200
• “LED Codes for BCU Operation Status” on page 201
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