GM Service Manual Online
For 1990-2009 cars only

Front and Rear Side Marker Lamps, Park/Turn Signal Lamps, Stop/Taillamps, Middle Taillamp and Rear License Lamps

When the headlamp switch is in the HEAD position, the park lamp relay K130 is energized and B+ is supplied to fuses #23, #26 and #30. Fuse #23 supplies B+ to the LH park/turn signal lamp, the LH stop/taillamp and to the LH rear side marker lamp. Fuse #26 supplies B+ to the LH and RH front side marker lamps, the middle taillamp and the LH and RH rear license lamps. Fuse #30 supplies B+ to the RH park/turn signal lamp, the RH stop/taillamp and to the RH rear side marker lamp. The LH and RH park/turn signal lamps are permanently grounded to G103. The LH and RH stop/taillamps are permanently grounded to G400. The front side marker lamps are permanently grounded to G400 through the stop/taillamps. The middle taillamp and the LH and RH rear license lamps are permanently grounded to G400.

Stop Lamps and Auxiliary Brake Lamp

Fuse #12 supplies B+ to the stop lamp switch at all times. When the brake pedal is pressed, the stop lamp switch supplies B+ to the LH and RH stop lamps and also to the auxiliary brake lamp. The LH and RH stop lamps and the auxiliary brake lamp are permanently grounded to G400.

Turn Signal Lamps

Fuse #3 supplies B+ to the turn signal lamp flasher K10 through the hazard warning switch. When the turn signal switch is engaged to the "TURN LEFT" position, pulsating voltage is supplied from the turn signal lamp flasher K10 to the LH turn indicator, to the LH park/turn signal lamp and to the LH stop/taillamp through the turn signal switch. When the turn signal switch is engaged to the "TURN RIGHT" position, pulsating voltage is supplied from the turn signal lamp flasher K10 to the RH turn indicator, to the RH park/turn signal lamp and to the RH stop/taillamp through the turn signal switch. The LH and RH turn indicators are permanently grounded within the instrument cluster to G103. The LH and RH park/turn signal lamps are permanently grounded to G103. The LH and RH stop/taillamps are permanently grounded to G400.

Cornering Lamps

When the low beam relay K131 is energized, B+ is supplied to fuse #31. Fuse #31 supplies B+ to the turn signal switch. When the turn signal switch is engaged to the "TURN RIGHT" position, B+ is supplied to the RH cornering lamp through the turn signal switch. When the turn signal switch is engaged to the "TURN LEFT" position, B+ is supplied to the LH cornering lamp through the turn signal switch. The LH and RH cornering lamps are permanently grounded to G103.

Hazard Warning Lamps

Fuse #12 supplies B+ to the hazard warning switch at all times. When the hazard warning switch is pressed to the ON position, pulsating voltage is supplied from the turn signal lamp flasher K10 to the LH and RH turn indicators, to the LH and RH park/turn signal lamps and to the LH and RH stop/taillamps through the hazard warning switch. The LH and RH turn indicators are permanently grounded within the instrument cluster to G103. The LH and RH park/turn signal lamps are permanently grounded to G103. The LH and RH stop/taillamps are permanently grounded to G400.