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DTC B2597: Traction Control Switch Circuit: Diagnosis

  1. Perform BCM DIAGNOSTIC SYSTEM CHECK in appropriate BODY CONTROL MODULES article. After performing diagnostic system check, go to next step.
  2. Install scan tool. Turn ignition switch to ON position, engine off. Using scan tool, observe TCS SWITCH parameter in BCM data list. If scan tool displays INACTIVE, go to next step. If scan tool does not display INACTIVE, go to step  4 .
  3. Activate TCS switch. Using scan tool, observe TCS SWITCH parameter. If TCS SWITCH parameter changes state, see DIAGNOSTIC AIDS  . If TCS SWITCH parameter does not change states, go to next step.
  4. Turn ignition switch to OFF position. Disconnect TCS switch. Turn ignition switch to ON position, engine off. Using scan tool, observe TCS SWITCH parameter. If scan tool displayed INACTIVE, go to step  7 . If scan tool does not display INACTIVE, go to next step.
  5. Check Brown/White wire between BCM and TCS switch for short to ground. If problem was found, repair as necessary. After repairs, go to step  10 . If problem was not found, go to next step.
  6. Check BCM connector for poor connections. If problem was found, repair as necessary. After repairs, go to step  10 . If problem was not found, go to step  8 .
  7. Check TCS switch for poor connections. If problem was found, repair as necessary. After repairs, go to step  10 . If problem was not found, go to step  9 .
  8. Replace BCM. See appropriate BODY CONTROL MODULES article in ACCESSORIES & EQUIPMENT. After repairs, go to step  10 .
  9. Replace TCS switch. See TRACTION CONTROL SWITCH  under REMOVAL & INSTALLATION. After repairs, go to next step.
  10. Using scan tool, clear DTCs. Operate vehicle. If DTC does not reset, system is okay.
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