Instrument Panel - Illumination Feature Operation

9223buick05

Bulletin 91-8-9

Date Nov. '90

Ref. No. 91-059-8

Corp. Ref. No. 038138


SUBJECT:
SERVICE MANUAL UPDATE - SECTION 8A - INSTRUMENT PANEL ILLUMINATION FEATURE OPERATION

MODELS AFFECTED:
1991 REGAL


SERVICE MANUAL UPDATE (Section 8A)

The 1991 Regal is equipped with an instrument panel illumination feature which is a function of the light switch. This illumination feature operates as follows:

With any door open or with the light switch in the "DOME" or "INT" position, terminal C, early production or terminal D, late production, of the light switch receives a ground signal from the door jamb switch through the WHT (156) wires (see page 8A-114-2) or internally through the light switch. When the last door is closed and the light switch is not in the "DOME" or "INT" position, or when the light switch is moved from the "DOME" or "INT" position with all doors closed, ground is removed from terminal D of the light switch. The light switch then supplies voltage for about 30 seconds through the GRY (8) wires to illuminate the instrument cluster, radio, heater and A/C control assembly, console PRNDL, ashtray, (steering wheel controls if equipped) and the front door lock and window switches (see pages 8A-117-0, 8A-117-1, 8A-117-2 and 8A-117-4).