Identifying Sentry Key Immobilizer System (Skis) Problems
- Ensure battery is fully charged. Using scan tool, select THEFT ALARM, then SKIM. If scan tool displays NO RESPONSE, go to TEST 16A in appropriate VEHICLE COMMUNICATIONS article.
- Using scan tool, read and record SKIM DTCs (fault messages). Erase SKIM DTCs. Cycle ignition switch to OFF, then RUN/START position. Leave ignition in RUN/START position for 3 minutes. Read SKIM DTCs to verify that codes displayed are current faults. See SKIS DIAGNOSTIC TEST DIRECTORY table. If no codes (fault messages) are present, go to PRE-EXISTING FAULT MESSAGE TEST DIRECTORY table.SKIS DIAGNOSTIC TEST DIRECTORY
Fault Message Perform Antenna Failure (1) EEPROM Failure (1) Transponder communication Failure TEST 2A Transponder Cyclic Redundancy Check (CRC) Failure TEST 2A Transponder ID Mismatched TEST 3A Transponder ID Mismatched & EEPROM Failure (1) Transponder Response Mismatch TEST 3A Transponder Response Mismatch & EEPROM Failure (1) VIN Mismatch TEST 4A VIN Mismatch & PCM Has An EEPROM DTC Stored In Memory (2) VIN Mismatch & Roll Code Failure With Or Without An EEPROM Failure TEST 4A Internal SKIM Failure (1) Serial Link External Failure (3) TEST 9A Serial Link External Failure TEST 10A Serial Link Internal Failure (1) PCM Status Failure (4) TEST 10A Rolling Code Failure (5) TEST 10A (1) Replace SKIM and perform SKIM INITIALIZATION PROCEDURE . (2) See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE. After repair, go to SKIS TEST 4A . (3) When attempting to send secret key to PCM. (4) Fault maturity time is approximately 20 seconds. (5) Fault maturity time is approximately 4 seconds. PRE-EXISTING FAULT MESSAGE TEST DIRECTORYProblem Perform Antenna Failure (1) VIN Mismatch & EEPROM Failure TEST 5A EEPROM Failure TEST 6A Internal SKIM Failure TEST 7A Serial Link External Failure TEST 8A Serial Link Internal Failure (1) PCM Status Failure TEST 8A Rolling Code Failure TEST 8A Transponder ID Mismatched & EEPROM Failure TEST 11A Transponder Response Mismatch & EEPROM failure TEST 11A Transponder ID Mismatched TEST 12A Transponder Response Mismatch TEST 12A Transponder Communication Failure TEST 12A Transponder Cyclic Redundancy Check (CRC) Failure TEST 12A (1) Replace SKIM and perform SKIM INITIALIZATION PROCEDURE .
NOTE:
Ensure all of the customer's keys are obtained before beginning SKIS diagnosis and repair. If the Sentry Key Immobilizer Module (SKIM) requires replacing, all keys must be reprogrammed to new SKIM.