B1A6C
B1A6C-SECRET KEY MISMATCH
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 for the secret key information. The repair of this fault condition
relies on whether the current secret key information, in the FOBIK, is recognized by the WIN.
- When Monitored:
During interrogation, the FOBIK sends a radio frequency (RF) signal to the WIN that includes the current secret key.
- Set Condition:
This Diagnostic Trouble Code (DTC) sets if the WIN receives a secret key ID from the FOBIK that is not the correct secret key value stored
in the WIN. This DTC will remain active until a valid, programmed FOBIK, with the correct secret key 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: When diagnosing any WIN system concern, all the FOBIKS should be present.
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/ECM VIN to the WIN VIN
and ensure the two VINs match.
2. With the scan tool, record and erase the DTCs.
3. Perform 3 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; B1A6C-SECRET KEY MISMATCH 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. . See: Verification Tests/Vehicle Theft Security Verification Tests/Wireless Ignition Node (WIN)
Verification Test
2. ENGINE DOES NOT CRANK
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
2010 Jeep Truck Grand Cherokee SRT-8 V8-6.1L Page 19
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
- Replace the Wireless Ignition Node (WIN). If this vehicle is equipped with a Steering Column Lock Module, 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
- Go To 3
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
- Using the scan tool, program 2 FOBIKS.
- Perform the BODY VERIFICATION TEST. See: Verification Tests/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, and read the active DTCs.
Does the scan tool display: B1A6C-SECRET KEY MISMATCH as active?
Yes
- Replace the Wireless Ignition Node (WIN). If this vehicle is equipped with a Steering Column Lock Module, it must also be replaced.
When replacing the WIN and the Steering Column Lock Module, the Win MUST be programmed BEFORE the Steering Column
2010 Jeep Truck Grand Cherokee SRT-8 V8-6.1L Page 20
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
- Repair is complete.
- Perform the BODY VERIFICATION TEST. See: Verification Tests/Body Verification Test.
B1A6C-SECRET KEY MISMATCH
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 for the secret key information. The repair of this fault condition
relies on whether the current secret key information, in the FOBIK, is recognized by the WIN.
- When Monitored:
During interrogation, the FOBIK sends a radio frequency (RF) signal to the WIN that includes the current secret key.
- Set Condition:
This Diagnostic Trouble Code (DTC) sets if the WIN receives a secret key ID from the FOBIK that is not the correct secret key value stored
in the WIN. This DTC will remain active until a valid, programmed FOBIK, with the correct secret key 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: When diagnosing any WIN system concern, all the FOBIKS should be present.
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/ECM VIN to the WIN VIN
and ensure the two VINs match.
2. With the scan tool, record and erase the DTCs.
3. Perform 3 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; B1A6C-SECRET KEY MISMATCH 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. . See: Verification Tests/Vehicle Theft Security Verification Tests/Wireless Ignition Node (WIN)
Verification Test
2. ENGINE DOES NOT CRANK
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
2010 Jeep Truck Grand Cherokee SRT-8 V8-6.1L Page 19
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
- Replace the Wireless Ignition Node (WIN). If this vehicle is equipped with a Steering Column Lock Module, 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
- Go To 3
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
- Using the scan tool, program 2 FOBIKS.
- Perform the BODY VERIFICATION TEST. See: Verification Tests/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, and read the active DTCs.
Does the scan tool display: B1A6C-SECRET KEY MISMATCH as active?
Yes
- Replace the Wireless Ignition Node (WIN). If this vehicle is equipped with a Steering Column Lock Module, it must also be replaced.
When replacing the WIN and the Steering Column Lock Module, the Win MUST be programmed BEFORE the Steering Column
2010 Jeep Truck Grand Cherokee SRT-8 V8-6.1L Page 20
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
- Repair is complete.
- Perform the BODY VERIFICATION TEST. See: Verification Tests/Body Verification Test.
