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System Tests: Notes

NOTE: For connector terminal identification, see Fig 1. For terminal wire color identification, see WIRING DIAGRAMS . For further speedometer testing, see Vehicle Speed Sensor (VSS) related codes in appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE.
CAUTION: When battery is disconnected, vehicle computer and memory systems may lose memory data. Driveability problems may exist until computer systems have completed a relearn cycle. See COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION before disconnecting battery.
Fig 1: Identifying Instrument Cluster Connector
G98C00762Courtesy of GENERAL MOTORS CORP.