B1A29 SKIM Basestation Mismatch

B1A29 SKIM Basestation Mismatch - At ignition on, after ignition on during any rolling code handshake that occurs with the PCM due to a Sentry Key Remote Entry Module (SKREEM) also known as the Wireless Control Module (WCM) or PCM reset.

Set condition DTC B1A29 SKIM Basestation Mismatch

When a PCM/ECM STATUS message with a valid key status is not received by the WCM within 3.5 seconds of transmitting tha last valid key code message to the PCM.

Possible causes B1A29 SKIM Basestation Mismatch

• Verifying PCM VIN.
• Intermittent wiring harness problem.
• Powertrain Control Module (PCM).

Sep by step Diagnose DTC B1A29 SKIM Basestation Mismatch

Step 1. Determining if DTC is current

With the scan tool, erase the WCM DTCs. Turn the ignition off, wait 10 seconds, turn the ignition on and wait two minutes. With the scan tool, read the WCM DTCs.

Does the scan tool display the DTC that was previously erased?

YES, go to step 2.

NO, go to step 4.

Step 2. Verifying the PCM VIN

Turn the ignition on, with the scan tool, select engine system the main menu. Display and record the vehicle identification number (VIN).

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.

Does the VIN recorded from the PCM match the VIN of the vahicle?

YES, go to step 3.

NO, using the scan tool perform the PCM replace procedure to update the VIN in the PCM. Perform the WCM Verification test.

Step 3. Replace WCM and check DTCs

Turn the ignition off, replace and program the WCM. Turn the ignition on, with the scan tool, display and clear all PCM and WCM DTCs. Perform five ignition key cycles leaving the ignition key on for 90 seconds per cycle. With the scan tool, check for WCM DTCs.

Does the scan tool display the same DTC?

YES, replace and program the PCM. Perform the WCM Verification test.

NO, the repair is complete.

Step 4. Intermittent

Turn the ignition off.

Note: Check for the following conditions:

• Visually inspect the related wiring harness. Look for any chafed, pierced, pinched, or partially broken wires.
• Visually inspect the related wiring harness connectors. Look for broken, bent, pushed out, or corroded terminals.
• Perform any technical service bulletins that may apply.

Were any problems found?

YES, repair wiring harness/connectors as necessary.

NO, test complete for DTC B1A29 SKIM Basestation Mismatch.

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