Alarm ECU

As stated in S.I. 02/90-1216, a running change was made in early-1990 9000 production to an improved alarm system ECU. This new ECU, P/N 40 92 037, features improved resistance to inadvertent owner entry into the "Diagnostic" mode as well as a revised default level for the motion detector sensitivity. Please note that, despite, the change in default level, the motion detector sensitivity should be adjusted to minimize the risk of false alarms (see page 2 of this S.I.).

Because of these improvements, certain customer complaints regarding the operation of the early-design alarm ECU (P/N 95 66 100) should be remedied by installing the improved alarm ECU. These complaints include:

^ Inadvertent entry into the "Diagnostic" mode (car will not start)

^ Erratic motion detector operation and resultant false alarms

^ Any other ECU-related faults

Parts Required:

Alarm ECU P/N 40 92 037