SERVICE MANUAL UPDATE SEC. 8A CELL 81 VEHICLE SPEED INPUT

VEHICLES AFFECTED: 1988-90 OLDS W CAR

Cell 81 Vehicle Speed Input - Short Circuit

The attached pages (8A-81-34 and 8A-81-35) are replacement pages for the 1988 Oldsmobile W-Car Service Manual.

Cell 81 Vehicle Speed Input - Short Circuit

The attached pages (8A-81-34 and 8A-81-35) are replacement pages for the 1989 and 1990 Oldsmobile W-car Service Manual.

Please update your Manuals.

CODE 1009 VEHICLE SPEED INPUT-SHORT CIRCUIT

Code 1009 will set if the Ignition is in RUN and the serial data link speed is 5 MPH or greater than the vehicle speed input for 5 seconds and the Vehicle Speed Input at the Electronic Instrument Cluster is LO.

TEST EXPLANATIONS

The circled numbers refer to the test procedures in the trouble tree.

(1) This step checks if a short to ground exists in CKT 389 or the Electronic Instrument Cluster is at fault.

(2) This step determines if the short exists in the Cruise Control Module.

(2) This step determines if the short exists in the Chime Module.

(4) This step determines if the short exists in the Electronic Control Module or in CKT 389.

CODE 1009 VEHICLE SPEED INPUT-SHORT CIRCUIT

Code 1009 will set if the Ignition is in RUN and the serial data link speed is 5 MPH or greater than the vehicle speed input for 5 seconds and the Vehicle Speed Input at the Electronic Instrument Cluster is LO.

TEST EXPLANATIONS

The circled numbers refer to the test procedures in the trouble tree.

(1) This step checks if a short to ground exists in CKT 389 or the Electronic Instrument Cluster is at fault.

(2) This step determines if the short exists in the Passive Restraint Control Module, Cruise Control Module, HUD Unit, Chime Module or Driver Information Center.

(3) This step determines if the short exists in the Electronic Control Module or in CKT 389.

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.