Diagnostic Aids

WARNING: This page does not describe the selected car, but rather 24 other vehicles, including the 1992 GMC Yukon, 1992 GMC Vandura Special, 1992 GMC Vandura, 1992 GMC Value Van, and 1992 GMC Suburban. However, it is still accessible from the selected car via links, so may be relevant.

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.