Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSOLDSMOBILE1996EIGHTY-EIGHT LSS FWD V6-3.8L VIN KREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSINFORMATION BUSDESCRIPTION AND OPERATION
1996 Oldsmobile Eighty-Eight LSS FWD V6-3.8L VIN K
Information Bus: Description and Operation
1996 Oldsmobile Eighty-Eight LSS FWD V6-3.8L VIN KSECTION Description and Operation
The serial data line is the means by which the microprocessor controlled modules in the vehicle communicate with each other. There are two different serial data lines on this vehicle, Universal Asynchronous Receiver/Transmitter (UART) and Class 2.
UART Data Line
On UART based communication systems, there is a master of the serial data line and remote transceivers. The master controls the message traffic on the serial data line by polling all of the remotes (control modules) and then waiting for the proper response. The control modules on the UART data line are:
^ Electronic Brake (and Traction) Control Module (EBTCM)
^ Sensing and Diagnostic Module (SDM)
^ HVAC Programmer
Class 2 Data Line
Class 2 data is transmitted at a higher speed and messages are configured differently than UART data. While UART uses a master to control serial data line traffic, Class 2 uses the peer-to-peer method along with message arbitration to manage data line traffic. The control modules on the Class 2 data line are:
^ Powertrain Control Module (PCM)
^ Remote Function Actuator (RFA) Module
UART Data Line
On UART based communication systems, there is a master of the serial data line and remote transceivers. The master controls the message traffic on the serial data line by polling all of the remotes (control modules) and then waiting for the proper response. The control modules on the UART data line are:
^ Electronic Brake (and Traction) Control Module (EBTCM)
^ Sensing and Diagnostic Module (SDM)
^ HVAC Programmer
Class 2 Data Line
Class 2 data is transmitted at a higher speed and messages are configured differently than UART data. While UART uses a master to control serial data line traffic, Class 2 uses the peer-to-peer method along with message arbitration to manage data line traffic. The control modules on the Class 2 data line are:
^ Powertrain Control Module (PCM)
^ Remote Function Actuator (RFA) Module
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.