Test Step 1 - Verify DTC Is Active

• Turn the ignition on.
• With the scan tool, read active Door Module DTCs.

Is this DTC active?

Yes 

• Go to Test Step 2 - CHECK THE LIN BUS CIRCUIT 

No 

• Refer to STORED LOST COMMUNICATION DTCS (2009 - 2010) or STORED LOST COMMUNICATION DTCS (2011 & UP) and perform the Stored Lost Communication DTCs diagnostic procedure.