DLC C251 connection location

**DKR** · #1 (**permalink**) 07-15-2008, 02:11 PM

Like the title says...anyone know where to find the C251 connector? It is related to the Factory Trailer Brake Controller and how it communicates to the truck.

I have a U1900 code (ABS CAN Comm BUS Fault) and the TBC has been replaced and still throwing code.

TBC works fine when hooked to trailer, lights and if I push manual brake lever, the gauge lights up full and engages the trailer brakes. However, when you press the truck's brake pedal, it does not light up the TBC gauge and I don't believe it engages the trailer brakes.

My MODIS says to check the Data Link Connector (DLC) C251 for damage and then to check voltage at Pin #9. Any advice to find the C251 connector would be appreciated.

**DKR** · #2 (**permalink**) 07-15-2008, 04:08 PM

I am having NO luck Googling it...anyone lend a hand?

**DKR** · #3 (**permalink**) 07-15-2008, 05:02 PM

Just another bump for the night!

Anyone?

BigRed · #4 (**permalink**) 07-15-2008, 05:09 PM

Not a clue, sounds like it may be related to the brake switch or somewhere in that circuit...

**Evil Eye** · #5 (**permalink**) 07-15-2008, 06:10 PM

Here you go, Eric.

**DKR** · #6 (**permalink**) 07-16-2008, 05:53 PM

Shawn emailed me the PDFs for them and now I know where to look. Much thanks Shawn!!

**Evil Eye** · #7 (**permalink**) 07-16-2008, 06:14 PM

Sure thing, Eric! Glad to help out.

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