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Home › Saturn › 2002 › L100 › Repair and Diagnosis › Engine Performance › System › Engine Controls - Self-Diagnostics › Diagnostic Tests › DTC P0724: Brake Switch Circuit Low › Diagnostic Procedures

Diagnostic Procedures

  1. Turn ignition on, with engine off. Using scan tool, monitor BRAKE SWITCH while depressing and releasing brake pedal. If scan tool does not indicate RELEASED when brake pedal is applied, problem is intermittent. See DIAGNOSTIC AIDS  . If scan tool indicates RELEASED when brake pedal is applied, go to next step.
  2. Check BRAKE fuse (15-amp). Replace and retest if open. If fuse continues to open, repair short in Orange wire or Light Blue wire between underhood fuse block and PCM. Remove left side lower instrument panel cover. Disconnect stoplight switch. Connect jumper wire between Orange wire and Light Blue wire at stoplight switch connector. If scan tool consistently indicates APPLIED, check stoplight switch connector and adjustment. If connector and adjustment are okay, replace stoplight switch. If scan tool does not consistently indicated APPLIED, go to next step.
  3. Connect test light between stoplight switch connector terminal No. 4 (Orange wire) and ground. If test light is on, check Light Blue wire between stoplight switch and PCM for open. If wire is okay, replace PCM. If test light is off, repair open in Orange wire between stoplight switch and underhood fuse block.
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