good morning and thank you for inquiring with JustAnswer. The lightflash code 27 you are getting is due to a failure with the Passenger Airbag Deactivation switch (PAD switch). usually these fail due to the bulb inside the switch burning out and not illuminating when the airbag is turned off, this is a very common concern on these vehicles. Usually these switches are repaced as the switch assembly but if you have some electrical knowledge you might be able to replace just the bulb yourself and get it working again. If the bulb is operative , i have posted the pinpoint test for you to follow below
Pinpoint Test M: LFC 27/DTC B1884 - Passenger Air Bag Deactivation (PAD) Warning Lamp Inoperative
The restraints control module (RCM) has the ability to deactivate the passenger air bag under certain conditions. When the passenger air bag is deactivated, the passenger air bag deactivation (PAD) switch warning lamp will be illuminated.
The RCM monitors the PAD switch warning lamp for open or short to ground conditions. If the RCM detects an open or short to ground condition on the PAD switch warning lamp circuit, it will store a diagnostic trouble code (DTC) B1884 in memory and flash a lamp fault code (LFC) 27 (or higher priority code if one exists) on the air bag indicator.
A PAD warning lamp inoperative fault could be caused by:
NOTE: Most faults are due to connector and/or wiring concerns. Carry out a thorough Inspection and Verification before proceeding with the Pinpoint Test.
WARNING: Restraint system diagnostic tools are for service only. Tools must be removed prior to operating the vehicle over the road. Failure to remove restraint system diagnostic tools could result in injury and possible violation of vehicle safety standards.
WARNING: Never probe the connectors on the air bag module. Doing so can result in air bag deployment, which can result in personal injury.
WARNING: The safety belt pretensioner is a pyrotechnic device. Always wear safety glasses when repairing an air bag equipped vehicle and when handling a safety belt buckle pretensioner or safety belt retractor pretensioner. Never probe a pretensioner electrical connector. Doing so could result in pretensioner or air bag deployment and could result in personal injury.
NOTE: After diagnosing or repairing an SRS, the restraint system diagnostic tools must be removed before operating the vehicle over the road.
NOTE: The SRS must be fully operational and free of faults before releasing the vehicle to the customer.
Pinpoint Test N: LFC 27/DTC B1890 - Passenger Air Bag Deactivation (PAD) Warning Lamp Short to Battery
The RCM monitors the PAD switch warning lamp for short to battery conditions. If the RCM detects a short to battery condition on the PAD switch warning lamp circuit, it will store a diagnostic trouble code (DTC) B1890 in memory and flash a lamp fault code (LFC) 27 (or higher priority code if one exists) on the air bag indicator.
A PAD warning lamp short to battery fault could be caused by: