Delco Bose Sound System - Popping Sound: Overview

Bulletin No. T 87-82
File in Group 9
Number 34
Corp. Ref. No. 719001
Date March '87

SUBJECT: POPPING NOISE - DELCO BOSE SOUND SYSTEM

MODELS AFFECTED: 1986-1987 ELDORADOS AND SEVILLES

Some 1986 and early 1987 Eldorados and Sevilles equipped with the Delco Bose System may experience a popping noise heard through the speaker enclosures as the brake is applied or the power seat switch or power window switch is released. 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.

NOTE: Separate procedures are required for vehicles equipped with astro-roofs to correct popping due to seat switches.

SEAT SWITCH POPS WITH ASTRO-ROOF OPTION

Parts Required Quantity
P/N 1644291 (Do Not Substitute) 3/Power Seat

Figure 1 - Seat Switch Pop Suppression With Astro-Roof Option:

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 9D of the Body Service Manual.

3. Disconnect power seat motor six-way connector.

4. Remove left power seat.

5. Using terminal pins, remove blue stripe wires from connector.

6. Solder capacitor P/N 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 leads as possible.

7. Tape capacitor leads to wires as shown in Figure 1-B. Be sure to securely wrap tape around capacitor leads so that they are completely insulated.

8. Reinstall terminals into connector. See Figure 1-C.

9. Repeat steps 5-8 for the green stripe wires.

10. Repeat steps 5-8 for the white stripe wires.

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 T6194 at 1.6 hours.