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DTC B2560: Remote Keyless Entry Message Validation Error: Testing

  1. Perform remote keyless entry diagnostic system check. See REMOTE KEYLESS ENTRY DIAGNOSTIC SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM. After performing diagnostic system check, go to next step.
  2. If DTC B2560 sets with only one transmitter, go to next step. If DTC B2560 does not set with only one transmitter, go to step  4 .
  3. Replace transmitter battery and reprogram transmitter. See KEYLESS ENTRY TRANSMITTER PROGRAMMING  under PROGRAMMING. After battery replacement and reprogramming transmitter, go to step  5 .
  4. If DTC B2560 sets with both transmitters, go to step  6 .
  5. Turn ignition off. Install scan tool. Turn ignition on, with engine off. Using scan tool, clear DTCs. Operate transmitter through all 4 button functions. Using scan tool, retrieve DTCs. If DTC B2560 resets, go to step  7 . If DTC B2560 does not reset, go to step  8 .
  6. Turn ignition off. Install scan tool. Turn ignition on, with engine off. Using scan tool, reprogram both transmitters. See KEYLESS ENTRY TRANSMITTER PROGRAMMING  under PROGRAMMING. Operate both transmitters through all 4 button functions. Using scan tool, retrieve DTCs. If DTC B2560 resets with both transmitters, go to step  9 . If DTC B2560 does not reset with both transmitters, go to step  8 .
  7. Replace and reprogram transmitter. See KEYLESS ENTRY TRANSMITTER PROGRAMMING  under PROGRAMMING. After transmitter replacement and reprogramming, go to next step.
  8. Verify remote keyless entry system operates properly by performing all 4 functions on transmitter. If RKE system operates properly, system is okay.
  9. Replace BCM. See BODY CONTROL MODULE  under REMOVAL & INSTALLATION. Reprogram BCM. See PROGRAMMING  . After replacement, go to step  8 .
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