This is a LFC 18 code below is some information about the problem and possible causes, there is a very extensive test for this code and several special tool will be needed to accomplish these tests. I would recommend taking this to a trained professional to have this looked at.
Pinpoint Test D: LFC I8 PAD Warning Lamp Circuit Failure CAUTION: The passenger air bag deactivation (PAD) indicator is part of integrated control panel (ICP) assembly and cannot be separately serviced. Installation of an incorrect ICP may cause a fault in the supplemental restraint system and illuminate the air bag warning indicator in the instrument cluster. Normal Operation - - When the ignition is in the on position, the PAD indicator prove-out period is initiated by the restraints control module (RCM). The RCM briefly activates the PAD indicator to verify to the occupants correct functional operation of the PAD indicator. If the RCM detects an open or short to ground on the PAD indicator circuit, it will store diagnostic trouble code (DTC) B 1884 in memory and flash lamp fault code (LFC) 18 (or higher priority code if one exists) on the air bag indicator.
Possible Causes - A PAD indicator circuit open can be caused by: