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Where is the speed sensor buffer for a 1989 Chevy 1500 pickup?

The 1989 Chevy 1500 pickup doesn't have a dedicated "speed sensor buffer." The speed signal from the Vehicle Speed Sensor (VSS) goes directly to the PCM (Powertrain Control Module). There's no intermediary buffer component. Any signal processing or manipulation happens within the PCM itself.

If you're experiencing issues with speed-related functions (speedometer, cruise control, transmission shifting), the problem is likely one of the following:

* VSS itself: This is the most common culprit. It's located in the transmission.

* Wiring between the VSS and PCM: Check for breaks, shorts, or corrosion in the wiring harness.

* PCM: The PCM may be malfunctioning and not properly interpreting the signal from the VSS.

Therefore, there's no specific location to look for a "speed sensor buffer"; the troubleshooting should focus on the VSS, its wiring, and the PCM.

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