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GMC R 1500 P/U 2WD V8-350 5.7L (1987)17 · Lighting and Horns
17 · Electrical

Backup Lamps/Tailgate Window Release - Inoperative (Backup Lamp Switch)

Make
GMC
Model
R 1500 P/U 2WD
Engine
V8-350 5.7L
Year
1987
Section
Dec › 91 › Backup Lamps/Tailgate Window Release - Inoperative
Lighting and HornsBackup Lamps/Tailgate Window Release - Inoperative
Backup Lamps/Tailgate Window Release - Inoperative (Backup Lamp Switch) – GMC R 1500 P/U 2WD V8-350 5.7L (1987)

Backup Lamp Switch: Customer Interest
Backup Lamps/Tailgate Window Release - Inoperative

GMC NUMBER:

91-8A-170

GROUP:

8A Cab Electrical

DATE:

December, 1991

CORPORATE
NUMBER:

168104

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 tailgate 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

0p.

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

0.2 hrs.

LLV

N2050

Switch, Park/Neutral-Replace

0.4 hrs.

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Parts & tools for this job For 1987 GMC R 1500 P/U 2WD 5.7L

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