Re: E39 - Radio has no volume?!?!

["J. Cash" <j.cash@xxxxxxxxxxxx>]

E39 - Radio has no volume?!?!

Strange - the radio seems to be functioning ok, but no volume at all?
Cassette plays, CDs change - just no sound...any ideas?

Thanks,
Dave
98 540/6 w/DSP

Since you have "no" sound, regardless of input source, and since you say
that the tape and CD's are operating (I am also assuming that you are seeing
normal information displayed in the MID display panel where you control the
audio system and OBC etc.)

Then the only common point will be the amp in the trunk.

Suggest you check "all" the audio fuses, especially the one in the trunk.

Radio - Glove Box #25,  7.5amp

Radio - Glove Box #43,  5amp

Radio - Glove Box #44,  5amp

Radio - Trunk #55, 20amp


Also check the connectors at the trunk amp.

If nothing obvious then I would suspect an amp fault. It does cut out if it
overheats. It has a blower fan outlet on the bottom of the amp but some of
the early DSP units had brackets that obstructed the outlet hole for the
fan.

If you can not find anything obvious then suggest you have the system
checked by a dealer. All the components in the system are separate with
their own internal software, but the work together by communicating across
the common digital bus - so very difficult to diagnose some types of faults.


Another thing you might try is rebooting the car. Disconnect the battery
cables and short the loose ends together (away from the battery). With them
still shorted turn on the ignition switch and also hit the on buttons for
the audio system. Of course nothing will operation but you will be draining
any power that may be causing a component to retain a memory glitch. Leave
for about 2 minutes then reconnect the battery and try again.

Everything will reboot from base memory - you may loose radio and DSP preset
settings, as well as your OBC info such as consumption, but this method
sometimes restores function to things that have gone into electronic limbo.

Cheers
Jim Cash

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