2012 Jeep Wrangler JK Factory Service Manual 28 - DTC-Based Diagnostics

B1A25-INVALID KEY

B1A25-INVALID KEY

For a complete wiring diagram, refer to the Wiring Information.



Possible Causes
KEY THAT HAS BEEN PREVIOUSLY PROGRAMMED FOR ANOTHER VEHICLE
MULTIPLE KEY OPERATION
IGNITION KEY
WIRELESS CONTROL MODULE (WCM)/SENTRY KEY REMOTE ENTRY MODULE (SKREEM)
INTERMITTENT WIRING HARNESS PROBLEM

1. DETERMINING IF DIAGNOSTIC TROUBLE CODE (DTC) IS CURRENT



NOTE: An external Radio-Frequency Identification (RFID) key (and/or pass/radio key), such as one used to gain access to a 24 hour gym, can cause this DTC to set and create a no start condition. Inspect the customer's key chain for any type of RFID key. If one is not found, question the customer to see if a spare key chain has this RFID key on it or if it was removed from the original key chain before the vehicle was released for service. If a RFID key is present, remove the ignition key from the vehicle and remove the RFID key from the key chain. For GPEC equipped vehicles, disconnect the battery and wait a minimum of 5 minutes, reconnect and attempt to start the vehicle. For NGC equipped vehicles, turn the ignition on a minimum for one hour, and then attempt to start the vehicle. If the vehicle does not start, continue with the diagnostic test.

NOTE: Verify the key being used is the proper key for this vehicle and a blank key. If the key being programmed is not blank (one that has been programmed for another vehicle) this fault will set.
1. With the scan tool, read and record the WCM DTCs.
2. With the scan tool, erase the WCM DTCs.

NOTE: Perform the following test several times to make sure the DTC is current.
3. Turn the ignition off.
4. Wait 10 seconds.
5. Turn the ignition on.
6. With the scan tool, read the WCM DTCs.


Does the scan tool display the DTC that was previously erased?

Yes


No


2. CHECKING FOR MULTIPLE KEYS



Are there multiple vehicle ignition keys available?

Yes


No


3. MULTIPLE KEY OPERATION



NOTE: Perform the following steps using one of the vehicle ignition keys. When finished, repeat the procedure using each of the other vehicle keys, one at a time.
1. With the scan tool, erase the WCM DTCs.
2. Turn the ignition off.
3. Wait 10 seconds.
4. Turn the ignition on.
5. With the scan tool, read the WCM DTCs.


Is the DTC present for all ignition keys?

Yes


No


4. REPROGRAM KEY

1. With the scan tool, attempt to reprogram the ignition key to the WCM.
2. With the scan tool, erase the WCM DTCs.
3. Wait 10 seconds.
4. Turn the ignition on.
5. With the scan tool, read the WCM DTCs.


Does the DTC set again?

Yes


No


5. PROGRAM NEW IGNITION KEY

1. Replace the ignition key with a new key.
2. With the scan tool, program the new ignition key to the WCM.
3. With the scan tool, erase the WCM DTCs.
4. Turn the ignition off.
5. Wait 10 seconds.
6. Turn the ignition on.
7. With the scan tool, read the WCM DTCs.


Does the DTC set again?

Yes


No


6. INTERMITTENT WIRING HARNESS PROBLEM

1. Turn the ignition off.


NOTE: Check the following items:

  • Visually inspect the related wiring harness. Look for any chafed, pierced, pinched, or partially broken wires.
  • Visually inspect the related wiring harness connectors. Look for broken, bent, pushed out, or corroded terminals.
  • Perform any Technical Service Bulletins (TSB) that may apply.


Were any problems found?

Yes


No