B1601: Incorrect Key Code From Ignition Key Transponder

DTC B1601: PATS RECEIVED INCORRECT KEY-CODE FROM IGNITION KEY TRANSPONDER (UNPROGRAMMED ENCODED IGNITION KEY)

B1601-1 Retrieve The DTCS
- Key OFF.
- Connect NGS to DLC.
- Retrieve and document continuous DTCs.
- Clear continuous DTCs.
- Perform PATS on-demand self-test.
Is DTC B1601 retrieved?
Yes
Go to B1601-2.
No
- System is OK.
- CHECK all other encoded ignition keys with PATS on-demand self-test to verify all other encoded ignition keys are programmed.

B1601-2 Check For Programmed Encoded Ignition Keys

Note: The PATS system is limited to 8 programmed keys.

- Monitor the PATS PID NUMKEYS.
Does the PATS PID NUMKEYS display 8?
Yes
- ERASE and REPROGRAM the key codes; REFER to Key Programming Erase All Key Codes and Program Two Keys. Service and Repair
- CLEAR the DTCs.
- TEST the system for normal operation.
No
Go to B1601-3.

B1601-3 Check The Number Of Encoded Ignition Keys Available
Are at least two currently programmed encoded ignition keys available with the vehicle?
Yes
Go to B1601-4.
No
- CUT new encoded ignition key so that at least two keys are available.
- PROGRAM the encoded ignition keys; REFER to Key Programming Erase All Key Codes and Program Two Keys. Service and Repair
- Go to B1601-5.

B1601-4 Verify The PATS PID SPAREKY Indicates YES
- Monitor the PATS PID SPAREKY. PATS Parameter Identification Index
Does the PATS PID SPAREKY indicate YES?
Yes
- REFER to Key Programming Program a Key Using Two Programmed Keys. Service and Repair
- TEST the system for normal operation.
No
- REFER to Key Programming Spare Key Programming Switch to enable the PID SPAREKY to YES. Service and Repair
- TEST the system for normal operation.
- Once completed, Go to B1601-5.

B1601-5 Check The Encoded Ignition Keys For Proper Operation
- Key OFF.
- Start the vehicle using the first encoded ignition key.
- Start the vehicle using the second encoded ignition key.
Does the vehicle start properly using both encoded ignition keys?
Yes
- System is OK.
- If there are additional keys that need to be programmed, REFER to Key Programming Program a Key Using Two Programmed Keys. Service and Repair
No
Go to B1601-6.

B1601-6 Retrieve The DTCs Check For DTC B1601
- Retrieve and document continuous DTCs.
- Clear continuous DTCs.
- Perform a Self-Test using both ignition keys from Step B1601-5.
Is DTC B1601 retrieved?
Yes
- REPLACE the Passive Anti-Theft System (PATS) Control Module. Service and Repair
- CYCLE the ignition to RUN using two encoded ignition keys.
- Go to Pinpoint Test B2139. B2139: PCM ID Does Not Match Between PATS and PCM
- CLEAR the DTCs.
- TEST the system for normal operation.
No.
- System is OK.
- If other DTCs are retrieved, REFER to PATS Diagnostic Trouble Code (DTC) Index. PATS Diagnostic Trouble Code (DTC) Index