B1A35
B1A35-UNIDENTIFIED KEY COMMUNICATION ERROR
For a complete wiring diagram, refer to the Wiring Information.
Theory of Operation
Whenever a Fob-Integrated-Key (FOBIK) is inserted in the Wireless Ignition Node (WIN) base station, 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 FOBIK ID is received by the WIN.
- When Monitored:
During interrogation, the FOBIK sends a radio frequency (RF) signal to the WIN that includes the programmed FOBIK ID.
- Set Condition:
This Diagnostic Trouble Code (DTC) sets if a FOBIK is inserted in the WIN base station but the WIN does not receive or is unable to read an ID from the FOBIK. This DTC will remain active until a valid, programmed FOBIK is inserted in the base station and rotated through the ON position.
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Wireless Ignition Node (WIN) Verification Test .
1. CHECK FOR AN INTERMITTENT CONDITION
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.
2. With the scan tool, record and erase the WIN DTCs.
3. Cycle the ignition switch from on to off and wait five seconds.
4. Turn the ignition on.
5. With the scan tool, read the active WIN DTCs.
Does the scan tool display: B1A35-UNIDENTIFIED KEY COMMUNICATION ERROR as active?
Yes
- If the engine does not crank, Go To 2
- If the engine does crank, Go To 3
No
- Perform the WIN INTERMITTENT TEST. Wireless Ignition Node (WIN) Verification Test.
2. ENGINE DOES NOT CRANK
NOTE: When diagnosing any WIN system concern, all 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.
Does the key (FOBIK) pass All Six Comparisons that are in the "Good Key" column?
Yes
- Go To 3
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 perform the "Program Ignition Key" routine.
- Perform the BODY VERIFICATION TEST. Body Verification Test.
3. VERIFY THE WIN HAS BEEN PROPERLY INITIALIZED
1. Using the scan tool, read the Number of Key/Fobs Programmed under Data Display.
Does the scan tool show 2 or more Key/Fobs Programmed?
Yes
- Go To 4
No
- With the scan tool, program 2 FOBIKS.
- Perform the BODY VERIFICATION TEST.Body Verification Test.
4. CHECK OPERATION OF THE FOBIK IN USE
NOTE: Verify the FOBIK in use is the FOBIK causing the DTC to set.
1. Replace the FOBIK currently in use.
2. Using the scan tool, program the new FOBIK to the WIN.
3. Use the scan tool and erase all DTCs in the WIN.
4. Turn the Ignition Off, and wait 15 seconds before turning the Ignition On.
5. Wait one minute.
6. Use the scan tool and read the active DTCs.
Does the scan tool display: B1A35-UNIDENTIFIED KEY COMMUNICATION ERROR as active?
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). Wireless Ignition Node Receiver - Removal
- Replace and program the Steering Column Lock Module (ELV). Shaft Lock Module - Removal.
- Perform the WIN VERIFICATION TEST. Wireless Ignition Node (WIN) Verification Test.
No
- Repair is complete.
- Perform the BODY VERIFICATION TEST.Body Verification Test.