CRUISE CONTROL SET OR RESUME INOPERATIVE

MODELS AFFECTED: 1988 DE VILLES, FLEETWOODS, ELDORADOS, AND SEVILLES

Some 1988 DeVilles, Fleetwoods, Eldorados, or Sevilles may experience one or more of the following symptoms:

- Cruise control is inoperative with an ECM code E67 stored (neither the "service now" nor "service soon" telltale will illuminate when a code E67 is stored). This condition may be caused by depressing the set/coast and resume/accel. buttons at the same time or by simultaneously switching the cruise on/off switch to "on" while depressing either the set/coast or resume/accel. button. When this occurs, the code E67 will be stored and the cruise control will be inoperative for the entire ignition cycle.

- Cruise control will not always resume to the previous set speed. This condition may result if the resume button has been depressed and held for too long. If this happens, the cruise control will engage instead of resuming.

These symptoms may be caused by an ECM MEM-CAL with a PROM I.D. of:

- 701 DeVille/Fleetwood Federal vehicles - 702 DeVille/Fleetwood California vehicles - 861 Eldorado/Seville Federal vehicles - 862 Eldorado/Seville Califomia vehicles

The ECM PROM I.D. can be checked by entering diagnostics and selecting the ECM PROM I.D. parameter as described in Section 8D of the appropriate 1988 Service Information Manual. To repair these conditions, replace the ECM MEM-CAL with the appropriate part number listed below:

Emission Service PROM Vehicle System P/N I.D. ------- -------- ------- ---- DeVille/Fleetwood Federal 16089317 850 DeVille/Fleetwood California 16089322 851 Eldorado/Seville Federal 16089308 1000 Eldorado/Seville Califomia 16089313 1001

This MEM-CAL will only repair the conditions stated above. If a code E67 was being set, the new MEM-CAL will not disable cruise control during the entire ignition cycle, but only while the condition is present.

If the MEM-CAL does not repair the condition; or a code E67 is set without engaging both the set/coast and resume/accel. at the same time; or by simultaneously switching the cruise on/off switch to "on" while depressing either the set/coast or resume/accel. button; or the resume function is inoperative for any other reason, refer to the appropriate Service Information Manual for diagnosis.

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.