For 1990-2009 cars

# INCORRECT DAY-OF-WEEK DISPLAYED FOR ETA. REVISED

#### VEHICLES AFFECTED: 1988-1989 CUTLASS CALAIS

Customers of a 1988 Cutlass Calais equipped with the Driver Information System (DIS) may comment that the incorrect day is displayed when using the ETA (estimated time of arrival) mode only. This condition is caused by a software error programmed into the DIS unit and only occurs during a leap year (1988, 1992, 1996, etc.).

******************************* OR *****************************

Customers of a 1988 or 1989 Cutlass Calais built from February 1, 1988 - September 1, 1988 (VIN's JM252060 - JM310276 and VIN's KM200021 - KM205204), equipped with the Driver Information System may comment that an incorrect tach display occurs between the following:

2950 RPM - 3000 RPM DIS Reads 2:00 3950 RPM - 4000 RPM DIS Reads 3:00 4950 RPM - 5000 RPM DIS Reads 4:00

This condition is also caused by a software error programmed into the DIS unit.

If any of the above conditions occur they can be repaired by replacing the Driver Information System Unit with Part Number 22548166.

#### NOTICE: When removing or installing the Driver Information System make sure the ignition is in the OFF position to avoid possible software initialization problems.

General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.