Diagnostic Aids

When diagnosing intermittent problems, select MALF HISTORY from "Scan" tester ABS menu. Supplemental data can be used to duplicate problem. Ensure terminals make good connection. Measure motor resistance. Resistance should be approximately .5 ohm.

Fig 1: Code 64 Schematic - Rear Motor Circuit Open

Courtesy of GENERAL MOTORS CORP.

Fig 2: Code 64 Flow Chart - Rear Motor Circuit Open

Courtesy of GENERAL MOTORS CORP.