Delco Bose Sound System Speakers - Popping Noise
87olds3SUBJECT POPPING NOISE - DELCO BOSE SOUND SYSTEM NUMBER: 87-T-24
SPEAKERS ENCLOSURES
DATE: May 22, 1987
MODELS/YEARS 1986-87 DELTA 88, NINETY-EIGHT AND
TORONADO MODELS SECTION: 9A
Some 1986 and early 1987 Delta 88, Ninety-Eight and Toronado models equipped with the Delco Bose system may experience a popping noise heard through the speaker enclosures as the power seat switch or power window switch is released or the brake is applied. The noise in the Delco Bose tuned enclosures is due to back current from one or more of these switches. To suppress popping, follow the procedures in this bulletin as needed.
1986-87 - Ninety-Eights and Toronados
Popping When Releasing Power Seat Switch
Parts Required Quantity
Part Number 1644291 (Do Not Substitute) 3 per Power Seat
FIGURE 1:
Procedure - Refer to Figure 1
1. With the ignition "off," disconnect the negative battery cable.
2. Remove left power seat trim as described in Section 9 of the Body Service Manual.
3. Disconnect power seat motor six-way connector.
4. Remove left power seat.
5. Using terminal pins, remove blue and yellow wires from connector. (Terminals A and B)
FIGURE 1A:
6. Solder capacitor part number 1644291 to the back of the terminals as shown in Figure 1-A. Position capacitor leads on top of terminal so that the capacitor is as far from the terminal as possible.
FIGURE 1B:
7. Tape capacitor leads to wires as shown in Figure 1-B. Be sure to securely wrap capacitor leads so that they are completely insulated.
FIGURE 1C:
8. Reinstall terminals into connector. See Figure 1-C.
9. Repeat steps 5-8 for the dark green and dark blue wires. (Terminals G and H)
10. Repeat steps 5-8 for the light green and tan wires. (Terminals D and E)
11. Reinstall power seat.
12. Connect power seat six-way connector to harness.
13. Reinstall power seat trim.
14. Repeat steps 1-13 for right seat.
For warranty purposes, use labor operation T4302 at .8 hrs. R.H. T4303 at .8 hrs. L.H.
Popping when releasing window switch
Parts Required Quantity
Part Number 20700250 - Jumper Harness 2
Part Number 3816659 - Strap 2
FIGURE 2:
Procedure - Refer to Figure 2
1. With ignition off, disconnect the negative battery cable, 2. Remove left door trim as described in Section 5 of the Body Service Manual.
3. Disconnect cross car harness from window motor.
4. Reroute cross car harness window motor lead from behind sheet metal and out the wide oblong opening to the right of the window motor.
5. Connect appropriate end of jumper harness to the cross car harness window motor lead.
6. Reroute the free end of the jumper harness behind the cross car harness and behind the sheet metal. Connect the jumper to the window motor.
7. Secure the jumper harness by strapping the middle of the jumper to the sheet metal between the wide oblong opening and the nearest narrow oblong opening.
NOTICE: Jumper harness should form a smooth curve as shown in Figure 2 below.
8. Reinstall left door trim.
9. Repeat steps 2-8 for the right door.
10. Reconnect the battery.
For warranty purposes, use labor operations T4304 at .5 hrs. R.H. T4305 at .5 hrs. L.H.
Popping when applying brake switch
Parts Required Quantity
Part Number 1644291 - Capacitor 2
Procedure
1. With the ignition "off," disconnect the negative battery cable.
2. Turn ignition off and remove left-hand sound insulator as described in section 8C of the service manual.
3. Disconnect electrical connector from brake switch and remove two terminals A and B from brake switch connector body. Remove any existing capacitors if present.
4. Install a capacitor part number 1644291 between terminals "A" and "B".
5. Remove terminal "C" and install the 2nd capacitor as shown between terminals B and C.
FIGURE 1A:
FIGURE 1B:
FIGURE 1C:
6. Solder connections and tape all exposed wires. (Figure 1A - 1C)
FIGURE 3:
7. Reinstall terminals in connector body (WHT Term. "A", ORN Term. "B" and LT. BLU/BLK in Terminal "C") (Figure 3)
8. Connect three cavity jumper harness connector to brake switch. Reinstall left-hand sound insulator.
For warranty purposes, use labor operation T4306 at .3 hours.