| Subject: | Diagnostic Information for No Audio Out of Speakers
on One or More Channels |
| Models: | 2003 Cadillac Escalade, Escalade EXT |
| 2003 Chevrolet Silverado, Suburban, Tahoe |
| 2003 GMC Sierra, Yukon, Yukon XL |
| with Premium (Bose®) Sound Systems |
Important: Before disconnecting the Bose® amplifier for an audio system speaker
diagnostic procedure, the 30 Amp Amplifier fuse must be removed from
the Underhood Bussed Electrical Center (UBEC).
When diagnosing a condition of no audio from one or more channels, the
30 Amp Amplifier fuse must be removed from the UBEC before beginning
any speaker/wire diagnosis.
Failure to remove the 30 Amp fuse from the UBEC can result in
a damaged Bose® amplifier. When the wires are reconnected to the amplifier
with the fuse in place, the resulting electrical surge can cause a failure
of the Bose® amplifiers internal components.
