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DTC B2597: TCS Switch Circuit (Short To Ground): Testing

  1. If BCM diagnostic system check was performed, go to next step. If BCM diagnostic system check was not performed, go to BCM DIAGNOSTIC SYSTEM CHECK  .
  2. Turn ignition off. Disconnect BCM connector C2. Using a test light connected to battery, probe BCM harness connector terminal D15 (Brown/White wire). If test light illuminates, go to next step. If test light does not illuminate, go to step 5).
  3. Ensure ignition is off. Disconnect TCS switch. Using a test light connected to battery, probe BCM harness connector terminal D15 (Brown/White wire). If test light illuminates, go to step 6). If test light does not illuminate, go to step 7).
  4. Turn ignition off. Reinstall all components and connectors. Turn ignition on. Clear DTCs. Wait 60 seconds and check for DTCs. If DTC B2597 is current, go to step 9). If DTC B2597 is not current, system is operating properly.
  5. Check for intermittent in TCS switch circuit. See DIAGNOSTIC AIDS. If no problem is found, go to step 4). If problem is found, go to step 8).
  6. Repair short to ground in Brown/White wire between BCM connector C2 and TCS switch. Go to step 10).
  7. Replace TCS switch. See appropriate ANTI-LOCK BRAKES article in BRAKES section. Go to step 10).
  8. Repair intermittent in TCS switch circuit. Go to step 10).
  9. Replace BCM. See REMOVAL & INSTALLATION  . Reprogram BCM. See BCM PROGRAMMING/RPO CONFIGURATION  . Go to next step.
  10. Turn ignition off. Reinstall all components and connectors. Turn ignition on. Clear DTCs. Perform BCM DIAGNOSTIC SYSTEM CHECK  .
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