REV. LIGHTS OR TAILGATE WINDOW INOPERATIVE-INSTALL NEW SWITCH

SUBJECT: BACKUP LAMPS OR TAILGATE WINDOW RELEASE INOPERATIVE (INSTALL REVISED SWITCH)

MODELS: 1980 - 1991 LIGHT DUTY TRUCKS WITH AUTOMATIC TRANSMISSIONS -----------------------------------------------------------------------------

Owners of some 1980-1991 C/K, 1982-1991 G, 1985-1991 M/L, 1984-1991 P2 and P3, 1987-1991 R/V, and 1983-1991 S/T (including LLV) with automatic transmissions may comment on a condition of inoperative back-up lamps or inoperative tailgate window release. This condition occurs when the vehicle's gear shift lever is placed in the "reverse" position but the back-up lamps do not illuminate. In addition, on the S/T utility vehicles, the electric tail- gate window release does not release when the transmission gear shift lever is placed in the "park" or "neutral" position and the endgate window release button is depressed. The park/neutral and back-up lamp switch comes out of adjustment, which does not allow for the contact points to remain engaged.

To correct these conditions, the contact carrier on the park/neutral and back-up lamp switch has been modified to increase switch carrier travel.

SERVICE PROCEDURE:

1. Disconnect the negative battery cable from the battery.

2. Disconnect the switch assembly harness.

3. Place the gear selector in neutral.

4. Squeeze the tangs on the switch together and remove the switch assembly.

5. Install the new switch assembly (P/N 15679680) by:

- aligning the actuator with the cutout in the steering column jacket.

- inserting the tangs into the rectangular holes and pushing down on the switch assembly .

6. Adjust the switch by moving the gear selector to park.

7. Connect the switch assembly harness.

8. Connect the negative battery cable.

9. Check for proper switch operation. Readjust the switch as necessary.

SERVICE PARTS INFORMATION:

Part Number Description ---------- ----------- 15679680 Park/Neutral and Back-up Lamp Switch

Parts are currently available from GMSPO.

WARRANTY INFORMATION:

For vehicles repaired under warranty use:

Labor Labor Model Op. Description Time ----- ----- ----------- ----- S/T N2050 Switch, Park/Neutral-Replace 0.4 hrs. C/K N2050 Switch, Park/Neutral-Replace 0.3 hrs. M/L N2050 Switch, Park/Neutral-Replace 0.3 hrs. P N2050 Switch, Park/Neutral-Replace 0.2 hrs. G N2050 Switch, Park/Neutral-Replace 10.2 hrs. LLV N2050 Switch, Park/Neutral-Replace 10.4 hrs.

General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.