DeVille V6-260 4.3L DSL (1985)
Ambient Light Sensor: Technical Service Bulletins
Headlamp Light Sensor Module - New Design
NO.: 91-I-26
DATE: Jan. 1991
GROUP: 9
CORP. NO.: 019018
SUBJECT: NEW TWILIGHT SENTINEL MODULE SERVICE PART
A new twilight sentinel module, P/N 5976634, has been released to service 1985-1989 DeVilles and Fleetwoods, 1984-1989 Broughams, 1984-1985
Eldorados and Sevilles, and 1984-1987 Cimarrons. This module has been revised to prevent repeat failures due to electrical system transients.
IMPORTANT. A twilight sentinel module failure will not cause a loss of headlights while driving.
Parts are currently available from GMSPO.