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Diagnostic Aids

If code is intermittent, see INTERMITTENTS in TESTS W/O CODES article. Check customer driving habits and/or unusual traffic conditions (i.e. stop and go expressway traffic).

Fig 1: Brake Signal Circuit Check, Schematic

Courtesy of GENERAL MOTORS CORP.

Fig 2: Brake Signal Circuit Check, Flow Chart

Courtesy of GENERAL MOTORS CORP.