B1A25
B1A25-INVALID KEY
Theory of Operation
Whenever a Fob-Integrated-Key (FOBIK) is inserted in the Wireless Ignition Node (WIN) basestation, the WIN performs a self test and
resynchronization routine. During the routine, the WIN interrogates the FOBIK, performing various validity and performance tests. The repair of this
fault condition relies on whether the ID of the FOBIK is recognized as valid in the WIN.
- When Monitored:
During interrogation, the FOBIK sends a radio frequency (RF) signal to the WIN that includes the programmed FOBIK ID.
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- Set Condition:
This DTC sets if the WIN receives an ID from the FOBIK that does not match any of the eight possible FOBIK IDs programmed in the WIN.
This DTC will remain active until a valid, programmed FOBIK is inserted in the basestation and rotated through the ON position.
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. . See: Verification Tests/Vehicle Theft Security
Verification Tests/Wireless Ignition Node (WIN) Verification Test
1. VERIFY THAT THE DIAGNOSTIC TROUBLE CODE (DTC) IS ACTIVE
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.
1. Turn the ignition on.
NOTE: Before continuing, review and check for the following:
- Review the repair history of the vehicle.
- Ensure that the vehicle has the correct PCM/ECM and WIN installed by verifying the part numbers.
- With the scan tool, ensure that the PCM/ECM and WIN are programmed correctly. Compare the PCM VIN to the WIN VIN and
ensure the two VINs match.
2. With the scan tool, record and erase the DTCs.
3. Perform three ignition cycles, leaving the ignition switch on for a minimum of one minute per cycle.
4. With the scan tool, read the active DTCs.
Does the scan tool display; B1A25-INVALID KEY as active?
Yes
- If the engine does not crank, Go To 2
- If the engine does crank, Go To 2 and answer "Yes" to the question in step 2.
No
- Perform the WIN INTERMITTENT TEST. . See: Verification Tests/Vehicle Theft Security Verification Tests/Wireless Ignition Node (WIN)
Verification Test
2. ENGINE DOES NOT CRANK
NOTE: When diagnosing any WIN system concern, all the FOBIKS should be present
1. If this vehicle does not crank, use the table below to determine if the key is functional or not. With the scan tool under Data Display, Bussed
Outputs, put the key in each position and check the "Ignition Status". Then with the key in the Run position, check "Valid Skim Key" and
"SCREEM Status" reported by the WIN (or WCM). Compare all six readings with the "Good Key" column.
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Does the key (FOBIK) pass All Six Comparisons that are in the "Good Key" column?
Yes
- Replace the Wireless Ignition Node (WIN). If this vehicle is equipped with a Steering Column Lock Module (BUX), it must also be
replaced. When replacing the WIN and the Steering Column Lock Module, the Win MUST be programmed before the Steering
Column Lock Module (ELV) is programmed. .
- Replace and program the Wireless Ignition Node (WIN). See: Powertrain Management/Ignition System/Sensors and Switches - Ignition
System/Ignition Switch/Service and Repair/Wireless Ignition Node Receiver - Removal
- Replace and program the Steering Column Lock Module (ELV). See: Steering and Suspension/Steering/Steering Column/Steering Column
Lock/Service and Repair/Shaft Lock Module - Removal.
- Perform the WIN VERIFICATION TEST. See: Verification Tests/Vehicle Theft Security Verification Tests/Wireless Ignition Node (WIN)
Verification Test.
No
- If the customer affirms that the FOBIK being used in this test is the correct one for this vehicle, use the scan tool and perform the "Program
Ignition Key" routine. If the key fails, replace the key (FOBIK) and program using the scan tool.
- Perform the BODY VERIFICATION TEST. See: Verification Tests/Body Verification Test.
