Truck had the brake and ABS lights on the dash. Almost all modules had the code:
U0121 - Lost communication with ABS module.
Sure enough, could not communicate with the ABS module. All other modules are working just fine. I always start off with looking at wiring diagrams. First I'll look at the Information Bus diagram to determine the type of network. Particularly I'm looking to see if the module in question has a direct connection to the DLC or if it relies on another module to pass its messages along. In this case it's a direct bus so I don't have to worry about any other gateway modules.
Next I go after the ABS wiring diagram and check powers and grounds. Interesting conclusion to this one!
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2 окт 2024
