A19030B

ServiceNews Article
December 2019
A19030B Version 3
Popping or Crackling from the Speakers? Check the MOST Bus
Network
AFFECTED VEHICLES
Year
Model
Trim
2018- 20
Odyssey
ALL except LX
2019- 20
Passport
ALL except Sport
2019- 20
Pilot
ALL except LX
EDITOR'S NOTE: This article replaces the one posted in May 2019.
Are you hearing a popping or crackling from the speakers? This may be due to a connection issue in the MOST bus
network or a harness/wiring issue.
To save you troubleshooting time, check the vehicle's repair history. Most reported cases of this issue happened after an
earlier repair was made to the system.
Check the MOST Bus Network Failure Log in the vehicle to help narrow down failure areas in the system, including
damaged connections. See S/B 19-097, Service Manual Update: MOST Bus Network Failure Log for details. If you don't
see any events listed, inspect all of the MOST connections.
CONNECTION ISSUES
Be sure to inspect the red and green MOST connectors of all infotainment system components and any connections
between the harnesses. If you find a damaged connector, like you see here, you must replace the entire harness. These
connectors are not repairable.
NOTICE
When unplugging these connectors during inspection or replacement, never use the cables for leverage. You can easily
damage the connectors.
©
2019 American Honda Motor Co., Inc. — All Rights Reserved
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If you want more info on what the MOST bus network does, look up the Tech2Tech ® video "Let's Talk MOST Bus
Network and ECL Diagnostics." And if you want to know how to check for damaged or loose connections, be sure to
check out the video "A Look at MOST Bus Network Connectors."
HARNESS ROUTING
During vehicle assembly, the harness for the infotainment unit could have been misrouted, causing tension on the
MOST connectors. This could cause a break in the signal during operation.
To fix this, disconnect the MOST connector and reroute the harness wire so the tension goes away.
We've also found that the MOST connectors on the DVD player may get pinched between the unit and the air ducting
box. We don't have a permanent fix for this, but you can try adjusting the wires to take pressure off of them.
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