A LFC 29 indicates Incorrect Vehicle ID.
The restraint control module (RCM) monitors the electrical condition at C208 pins 10, 13 and 14 to determine if it is installed on the correct vehicle. Each vehicle configuration (Expedition with and without side air bags and Navigator with side air bags) will have a unique vehicle ID. If the RCM detects other than the expected programmed condition on any of these pins, it will store diagnostic trouble code (DTC) C1414 in memory and flash a lamp fault code (LFC) 29 (or higher priority code if one exists) on the air bag indicator.
Possible Causes
An incorrect vehicle identification code can be caused by:
- internal RCM fault or an RCM installed on the wrong vehicle.
- an incorrectly programmed RCM.
- vehicle ID pins not connected as expected.
I am guessing you may have a bad RCM (Restraint Control Module) because these will usually need replaced after a deployment. The module will also need programmed! Dealership can do this for you.