Diagnostic Test
- 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 five 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 that the FOBIK in use is the FOBIK causing this DTC to set.
- Turn the ignition on.NOTE:
Before continuing, review and check for the following:
- Review the repair history of the vehicle.
- Make sure that the vehicle has the correct PCM and WIN installed by verifying the part numbers.
- With the scan tool, make sure that the PCM and WIN are programmed correctly. Compare the PCM VIN to the WIN VIN and make sure the two VINs match.
- With the scan tool, record and erase the DTCs.
- Perform two ignition cycles, leaving the ignition switch on for a minimum of one minute per cycle.
- 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.
No
- Perform the WIN INTERMITTENT TEST. Refer to Standard Procedure .
- Turn the ignition on.
- ENGINE DOES NOT CRANK NOTE:
When diagnosing any WIN system concern, all the FOBIKS should be present
- 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.
BUSSED OUTPUTS Ignition Status Good Key Bad Key (Failed) Wrong Key New Key (Blank) Ignition Position = Lock -------------- or Lock -------------- -------------- -------------- or Lock Ignition Position = Acc. Off/Acc. -------------- -------------- Off/Acc. Ignition Position = Run Or ON Run Lock Lock Run Ignition Position = Start
Engine Off - Trans. in GearStart or Run Lock Lock Run SKREEM Status Normal Status Service SKREEM Invalid Key SNA (Signal Not Available) Valid Skim Key Yes/True No/False No/False No/False Trouble Code (DTC) B1A35 B1A6C, B1A25 B1A24 Does the key (FOBIK) pass All Six Comparisons that are in the "Good Key" column?
Yes
- Replace and program the Wireless Ignition Node (WIN). Refer to RECEIVER, Wireless Ignition Node , Removal .
- Perform the WIN VERIFICATION TEST. Refer to Standard Procedure .
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 Keys or Key FOBs" routine. If the key fails, replace the key (FOBIK) and program using the scan tool.
- Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST for 1500, 2500 & 3500, or BODY VERIFICATION TEST for 3500 CAB & CHASSIS, 4500 & 5500 .
- 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.