Hummer H1 Service Manual page 931

12-154 Electrical System
NO SOUND FROM ANY SPEAKER, RADIO DISPLAY OPERATES NORMALLY (DELCO MONSOON)
STEP
1 Disconnect connector C62.
Turn ignition switch to the "Run" position.
Turn radio "On".
Insert the cassette or compact disc from Delco
Audio System Diagnostic Kit J–39916-A.
Set radio balance and fade controls to the
detente (center) position.
Set radio volume at normal listening level.
While playing the combination test tone
from the cassette or compact disc, use a
DVOM to measure AC voltage between
connector C62 terminals "E6" and "E7".
Is the voltage greater than 0v AC?
2 Check for a poor connection at the connec-
tor C62 terminals "E6" and "E7".
Was a poor connection found?
3 Using a DVOM, check for +12v between
the light green wire and the black wire (ckts
829 and 59) at the amplifier connection.
4 Turn the ignition switch to the "Run" position.
Turn the radio to the "On" position.
Insert the cassette or compact disc from Delco
Audio System Diagnostic Kit J–39916-A.
Set radio balance and fade controls to the
detente (center) position.
Set radio volume at normal listening level.
While playing the combination test tone
from the cassette or compact disc, use a
DVOM and backprobe connector C56
between terminals "16" and "15".
Is the voltage greater than 0v AC?
5 Check for a bad connection at connector
C56 terminals "16" or "15".
Is bad connection found?
3-1-01
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ACTION
CHART #4
VALUE(S) YES
> 0v AC Go to step 2.
Repair connection.
+12v Replace amplifier.
> 0v AC Repair the open or short
in ckts 821 or 820
between radio and
amplifier.
Repair connection.
NO
Go to step 4.
Go to step 3.
Repair open or poor con-
nection in ckts 829 and 59.
Go to step 5.
Replace radio.
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