Exterior Lights Circuit Description. Buick Riviera 1998

For 1990-2009 cars only

Makes 🢒 Buick 🢒 1998 🢒 Riviera 🢒 Body and Accessories 🢒 Lighting Systems 🢒 Exterior Lights Circuit Description

Turn Lights

With the ignition switch in the RUN or START position, battery positive voltage (B+) is applied through the instrument panel (IP) fuse block TURN LAMPS fuse via CKT 539 (PNK) to the turn signal flasher. Battery positive voltage (B+) is then applied to each turn switch in the turn/hazard switch assembly via CKT 16 (PPL). With the turn switch in the LH TURN position, battery positive voltage (B+) is applied through the turn/hazard switch assembly through 2 paths to the lamps. One path is through the left front park/turn lamps and the side marker lamps. The second path is applied through the left tail/stop/turn lamps. The lamps turn on immediately. The lamps begin to flash when both of the following conditions exist:

•	The current heats the timing element in the turn signal flasher.

•	The flasher repeatedly opens and closes the circuit.

A similar procedure is followed when the turn switch is in the RH TURN position.

Hazard Lights

Battery positive voltage (B+) is applied at all times through the right rear fuse block HAZD/STOP LPS fuse and the hazard flasher to the normally open switch in the turn/hazard switch assembly. With the hazard switch in the HAZARD position, battery positive voltage (B+) is applied through the turn/hazard switch to all 4 paths used by both the front and the rear turn lights. In the HAZARD position, the following conditions exist:

•	The turn circuit is always open.

•	The hazard flasher controls the flashing of the lamps.

Stop Lights

Battery positive voltage (B+) is applied at all times through the right rear fuse block HAZD/STOP LPS fuse to the stoplamp/BTSI switch. When the brake pedal is pressed, battery positive voltage (B+) is applied through the stoplamp/BTSI switch to the following components:

•	The tail/turn/stop lamps

•	The high mounted stop lamp

This condition causes all of the stop lamps to light.

Park/Tail/Marker/License Lights

Battery positive voltage (B+) is applied at all times through the right rear fuse block PARK LP fuse to the lamp control module (LCM). Under specific conditions, battery positive voltage (B+) is applied from the LCM through the instrument panel (IP) fuse block LH EXT LP fuse and the RH EXT LPS fuse to the following components:

•	The park/turn lamps

•	The tail/stop/turn lamps

•	The side marker lamps

•	The license lamps

This condition causes the lamps to light.

The following conditions are necessary for turning on the park lights:

•	The headlamp switch is in the PARK or ON position.

•	The ignition switch is in the RUN position.

•	The gear selector is not in the PARK position.

•	The ambient light sensor indicates darkness.

•	Perimeter lighting is present.

Cornering Lights

With the park lamps on, battery positive voltage (B+) is applied to each turn switch in the turn/hazard switch assembly. The left cornering lamp is permanently grounded to G104. The right cornering lamp is permanently grounded to G103. When a turn is indicated, that switch closes and battery positive voltage (B+) is applied to the respective cornering lamp. The cornering lamps do not flash during the turn signal operation.