Hummer H1 Service Manual page 930

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STEP ACTION
1 Turn ignition switch to the "Run" position.
Turn radio "On".
Insert 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 volume at normal listening level.
While playing the combination test tone
from cassette or compact disc, use a
DVOM to backprobe the speaker connec-
tor between terminals "A" and "B".
Is the voltage greater than 0v AC?
2 Check for a poor connection at the inop-
erative speaker.
If OK, replace the speaker.
Is the repair complete?
3 Check the + and - speaker circuits for a
short to B+ or ground between the
speaker and amplifier.
Is there a short?
4 Turn the ignition switch to the "Off" position.
Disconnect connector C62.
Using a DVOM set to measure resis-
tance, probe the amplifier connector
between the + and - speaker circuits of
the inoperative speaker (see schematics).
Is the resistance approximately 2-4
ohms?
5 Using a DVOM, check the resistance at
the speaker connection between termi-
nals "A" and "B".
Is the resistance 2-4 ohms?
6 Check for poor connection at connector
C62.
Is connection OK?
05745159
NO SOUND FROM ONE SPEAKER (DELCO MONSOON)
CHART #3
YES
VALUE(S)
> 0v AC Go to step 2.
System OK.
Repair short to ground or
B+.
2-4 ohms Go to step 6.
2-4 ohms Repair open in speaker +
or - circuit between
speaker connection and
amplifier connection.
Replace amplifier.
Electrical System
NO
Go to step 3.
Go to step 4.
Go to step 5.
Replace the speaker.
Repair connection.
12-153
3-1-01