Sovereign L6-4.0L (1991)
Speaker: All Technical Service Bulletins
Radio Bass Speaker - Poor Operation
86-115
Radio-Poor Bass Speaker Operation - Replace Rear Speakers
MODEL
91-92 MY Sedans
DATE
7/92
SUPERSEDES: TECHNICAL BULLETIN 86-91
ISSUE:
Cut or trapped bass speaker wiring resulting in the following conditions:
^
A loud "thump" noise when the radio is switched on or off.
^
No radio/tape sound.
^
Poor bass speaker operation.
ACTION:
At VIN 644136 a new bass speaker (DBC 110597) with shorter flyleads was introduced.
When diagnosing the above conditions, first check the routing of the heelboard bass speaker wiring prior to replacing the radio.
NOTE:
Replacing the radio before correcting a faulty wiring condition will result in damage to the replacement radio.
If the wiring is trapped between the speaker housing retaining clips (fig. 1) and the steel heelboard panel, the insulation may wear away allowing the wire
to ground.
BEFORE replacing the radio, check both speakers for correct wire routing (fig. 2) using the following procedure:
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Gently pry the rear bass speaker grill from the speaker housing.
^
Remove the four retaining screws securing the speaker assembly to the housing. Remove the speaker.
