Diagnostic Aids

Check for problem with one or more of following components: fuse, power supply circuit, brake switch or wire before splice. Check for wire or circuit problem between splice and PCM/TCM, poor connection to PCM/TCM or faulty PCM/TCM.

Fig 1: Brake Circuit Check Schematic - 1993

Courtesy of GENERAL MOTORS CORP.

Fig 2: Brake Circuit Check Flow Chart - 1993

Courtesy of GENERAL MOTORS CORP.