Stop Lamp Warning Lamp - ON When Using Telephone

90porsche08 December 14, 1990
Subject: Bulb Check Control Unit
Model Group

928 S4/GT 9

Part Identifier Number

9152 9006
ATTENTION: Service Manager/Service Technician

Models Affected: 928 S4 and 928 GT, from model year 1987

Concern: Stop lamp warning lights up when using car telephone.

Vehicle Information: A modified bulb check control unit has been installed as of production date May 2,1990.

Parts Information: Bulb check control unit: Part Number 928 641 603 10

Service Information: The new bulb check control unit can be installed in 928 series vehicles from Model Year 1987 up to the above production date if the stop lamp warning lights up in conjunction with the operation of a mobile telephone.

For additional information, refer to Technical Bulletin Group 9, Number 9003, dated June 22, 1990.