B1A29

B1A29-SKIM BASESTATION MISMATCH



Theory of Operation

For the engine to start, the Sentry Key Immobilizer (SKIM) feature of the Wireless Ignition Node (WIN) must successfully receive a message that a valid Fob-Integrated-Key (FOBIK) is being used, the FOBIK and WIN perform a "handshake" routine to validate this information, and a match allows the engine to run when the ignition state transitions to START.

- When Monitored:
Whenever a FOBIK is inserted in the basestation, the WIN determines its validity status.

- Set Condition:
When an invalid FOBIK is used and the WIN receives mismatching data from the SKIM, the WIN will send the command to illuminate the Security warning lamp and set this DTC as active. The engine will not start and the DTC will remain active until a valid FOBIK is used.





Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Wireless Ignition Node (WIN) Pre-Diagnostic Procedure.

1. DETERMINE ACTIVE OR STORED DIAGNOSTIC TROUBLE CODE (DTC)

Is the DTC active or stored?

WIN - ACTIVE DTC

- Go To 2

WIN - STORED DTC

- Perform the THEFT AND SECURITY SYSTEMS INTERMITTENT TEST. Wireless Ignition Node (WIN) Intermittent Condition Test.

2. VERIFY THE WIN HAS BEEN PROPERLY INITIALIZED

NOTE: When diagnosing any Theft or Security system concern, all FOBIKS must be present

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 3

No

- Program 2 FOBIKS.
- Perform the THEFT AND SECURITY SYSTEMS VERIFICATION TEST. Vehicle Theft Security Verification Tests.

3. VERIFY THE VIN STORED IN THE POWERTRAIN CONTROL MODULE (PCM).

NOTE: Make sure that a VIN has been programmed into the PCM. If a VIN is not displayed, attempt to program the PCM with the correct VIN before continuing.

1. With the scan tool, access the VIN number stored in the PCM.
2. Compare the VIN displayed, with the VIN of the vehicle.

Does the VIN recorded in the PCM match the VIN of the vehicle?

Yes

- NOTE: Technicians must use the scan tool to perform the WIN Programming procedure after a module replacement.
NOTE: If this vehicle is equipped with a Steering Column Lock Module, it MUST be replaced along with the Wireless Ignition Node.
- Replace the WIN.
- Perform the THEFT AND SECURITY SYSTEMS VERIFICATION TEST. Vehicle Theft Security Verification Tests

No

- Using the scan tool, perform the PCM Replaced Procedure to update the VIN in the PCM. Then, Go To 4

4. VERIFY PCM PROGRAMMING
1. Use the scan tool and erase all codes in the WIN and PCM.
2. Turn the Ignition Off, and wait 15 seconds before turning the Ignition On.
3. Wait one minute, and read active WIN codes.

Does the scan tool display this DTC as active?

Yes

- Replace and program the Powertrain Control Module.
- Perform the THEFT AND SECURITY SYSTEMS VERIFICATION TEST. Vehicle Theft Security Verification Tests.

No

- Repair is complete.
- Perform the THEFT AND SECURITY SYSTEMS VERIFICATION TEST. Vehicle Theft Security Verification Tests.