Airbag Light DTC 42 FIX

[koharatx]

I just figured I would share my experience fixing this problem. This seems to occur frequently enough. If your airbag light comes on, it will first blink a code, repeat it, then go solid. In my case, the airbag light would flash 4 times, pause, flash 2 times, pause a little longer, repeat, then go solid. If you have a different code, you will have to find out what it stand for, then go from there to remedy the problem. I found out that 42 is the code for the front impact severity sensor. Here it is -- it sits on the hood latch support, with a barcode on it. To replace this, I first removed the battery negative terminal and waited a minute. Then I unplugged the sensor. I removed the sensor and checked the pins and socket for corrosion. None found. I checked the sensor for continuity, and didn't get anything. I probed the socket, and got a continuity beep on my DVOM. NOTE: DO NOT EVER PROBE AN AIRBAG SYSTEM WITH YOUR BATTERY CONNECTED. So, I ordered a new sensor from the local dealership ($52 total), replaced the sensor, plugged it up, reconnected the battery, started my truck, and the airbag light no longer came on. Since I did not see any corrosion on the sensor's pins, I decided to perform a little destructive inspection. As you can see from the images below, water seems to find a way into the sensor and corrode circuit board components. Upon removing the cover from the sensor, I could see corrosion all over the PCB. I removed the PCB, checked underneath and in the housing itself and didn't really find any additional corrosion. The part number for the old sensor was 4L3A_14B006_AB. The replacement sensor is part number 6L3Z-14B004-AA. Hopefully, the updated part is sealed better.

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[projectSHO89]

Excellent work!