I have a 1999 F150 4x4 and the airbag light started blinking a "27" two flashes, pause, then seven flashes. Anyone know what this means?

 

Hi mbowker64 and welcome to FTE

Here is what the manual says about a LFC (light flashout code) 27. There are 2 different DTCs (diagnostic trouble code) that both pertain to LFC 27. If you took the vehicle in to get the sytem scanned the actual trouble code that would be retrieved would lead you to which of the 2 different pinpoint tests it could be. I dont think I've ever actually seen that code before but in my experience I've seen more RCM (restraint control module) problems than other problems.



Pinpoint Test O: LFC 27/DTC B1884 — Passenger Air Bag Deactivation (PAD) Warning Lamp Inoperative

Normal Operation

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.

Possible Causes

A PAD warning lamp inoperative fault could be caused by:

an open or short to ground on circuit 1113 (Y/LG).
a damaged or burned out PAD indicator.
a damaged or inoperative PAD switch.
a damaged or inoperative RCM.
a blown PAD switch I/P Fuse 22 (7.5 A).
an RCM internal concern.

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Pinpoint Test P: LFC 27/DTC B1890 — Passenger Air Bag Deactivation (PAD) Warning Lamp Short to Battery

Normal Operation

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 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.

Possible Causes

A PAD warning lamp short to battery fault could be caused by:

a short to battery on circuit 1113 (Y/LG).
a damaged or inoperative PAD switch.
a damaged or inoperative RCM.

 

Thanks for the info. I tried turning off the pass. side airbag and the "off" light did not come on. I turned it on and off several times but no light. I then turned it off and tapped the area around the switch and the "off" light popped on.

I suppose I need to take it into have the code cleared, huh? The "off" light now comes on each time I turn the airbag off.

 

You can try taking the battery terminal off and see if code will clear but usually they have to be reset with a scanner

 

I'd pull off that trim panel and look at the wires to the light and switch. Ensure that there is no exposed wiring that may be causing a short. Can't be too safe!

 

That and maybe think about a new switch if you can find a wiring problem. The switch could be sticky inside.

 

i have a similar issue. my 98 f150 is flashing 4-2. any ideas??

 

Light Flashout Code 42 is for the driver's air bag circuit. The most common problem in the clock spring or sliding contact as Ford sometimes calls it, in behind the steering wheel but it could also be the bag itself, the wiring in between the bad and the RCM ( Retsraint Control Module) or the RCM itself.
The manual lists a bunch of pinpoint tests which require some caution and knowhow so you dont accidently set off the airbag while you're testing
I would take a look at the connections under the steering column. If they are all ok you could maybe remove the clock spring and test it with an ohmmeter.

 

I have an '04 F150 Heritage that I have replaced the airbags, and control module in that gives me a 29 DTC. Help please.