I have a 1994 F150 with a 4.9 engine. When you first start the truck I have a beep that beeps five times in sequence five times in a row, 25 times in all. It does this every thirty minutes after startup. The local ford dealers have no idea. It is not blinking any problem codes, only this annoying beeping. Can anyone help?

 

The diagnostic monitor is responsible for monitoring the opoeration of OBCII functions (Prolly OBDI in your vehicle) as well as air bag system components and connections. A fault code will be displayed when the ignition switch is in the RUN position and the diagnostic monitor detects a system fault. Certain faults may not be displayed until approximately 30 seconds after the ignition has been switched to the RUN position.

This is the amount of time required for the diagnostic monitor to test and verify any and all system faults. The codes are produced by a series of air bag indicator flashes. The fault codes are represented by a two-digit decimal number. The two-digit fault code will be displayed in the following manner: flash tens digit, one second pause, flash ones digit, three second pause, repeat cycle. For example, a fault code 32 will be displayed according to:

flash flash flash, one second pause, flash flash, three second pause,
flash flash flash, one second pause, flash flash, three second pause...

The coded fault feature is prioritized so that if two or more different faults occur at the same time, the highest priority fault indication will be shown until corrected. The fault codes and their associated priorities are listed in the Fault Code Priority Table.

The codes are ranked from top to bottom with the fault at the top of the list having the highest priority and the fault at the bottom of the list having the lowest priority. This listing is for information only and should not be used for system diagnosis or troubleshooting. The deactivation procedure and diagnostic charts should be used to safely diagnose and service the system.

If a system fault exists and the indicator is malfunctioning, an audible tone will be heard indicating the need for service. The tone produced is a series of five sets of five beeps. The number of beeps does not indicate the fault code, it means the indicator is out and a fault is present.


HTH

 

Nope. The PCM handles all OBD functions, the airbag diagnostic monitor handles only the airbag system. There is no connection between the systems on a 94.

Wouldn't it have been easier to just say "Your airbag light in the cluster is burned out"?

Steve