LeSabre V6-231 3.8L VIN B FI (1986)
Radio/Stereo: Customer Interest
Radio - Ignition Noise
Bulletin
86-9-9
Date
June '86
Ref. No.
86-111-9
SUBJECT:
IGNITION NOISE IN RADIO
MODELS AFFECTED:
1986 LESABRE AND ELECTRA WITH DELCO BOSE RADIO (UU8)
An electrical interference, ignition type, noise on Delco Bose radio equipped 1986 LeSabres and Electras may be due to the radio ground wire routing. If
the interference is engine speed related, in all four speakers, and interference disappears with radio operated in ignition accessory position; then the
following procedure should be followed:
1.
Remove instrument panel trim panel for access to radio, right lower instrument panel close out panel, and glove box.
2.
Remove radio mounting screws and pull radio out far enough to unplug radio antenna. Unplug radio antenna, turn ignition to accessory position
and turn radio on.
3.
Disconnect grounds under hood at right front fender ground stud, one at a time, until radio ground is found. Leave radio ground off ground stud.
Reinstall other grounds and torque ground stud nut to 6-9 N-m (4-7 ft.lbs.). Clip off radio ground ring screw terminal, and tape back radio ground
wire at fender.
NOTE:
Ground ring screw terminal may be reused in fabricating new ground harness.
4.
Turn ignition off. Turn radio off. Disconnect battery.
5.
Pull radio out far enough to disconnect black connector (C1) at rear of radio. De-pin black ground wire out of connector (in cavity G). Tape back
wire.
FABRICATED GROUND HARNESS
6.
Make new ground harness per illustration using .8 black wire.
7.
Install new ground harness radio end in cavity G of black connector (C1). Reinstall black connector into back of radio. Route new ground wire
with Air Conditioning/Heater vacuum harness. Tie wire to vacuum harness to prevent rattles. Run to right side of instrument panel.
8.
On LeSabre: Locate Bose Relay (Bosch style) behind glove box. Splice 8 inch long section of new ground harness to black ground wire of relay
(terminal 85 and/or D of relay).
On Electra:
Attach 8 inch long section of new ground harness to radio power plug ground ride at junction block C201. Locate correct power
plug on left side of C201 junction block (behind, glove box). Radio power plug should be third from bottom. Remove old black
ground wire at power plug and splice in new ground wire.
9.
Install new ground harness ring screw terminal end to 10 mm bolt at right side instrument panel support bracket. Use external tooth lock washer to
obtain good ground.
10.
Connect battery. Torque terminals to 16-20 N-m (12-15 ft.lbs.).
11.
Install antenna connector at back of radio. Check operation of radio.
