![]() – Special Case: data bytes must send duplicate 255 value to differentiate from Frame End. This ABM unit uses the standard Bendix Data Protocol which is as follows: This gives us an inverted signal that will need to be flipped to be read with standard UART. ![]() ![]() This is an open collector output circuit to vehicle ground, so the Receiver pulls the line high and the ABM will pull the line low to transmit. TX output is found on Pin C4 of the ABM which connects to Pin D2-5 in the 15 pin Renix Diagnostic Adapter found in the engine bay. This self contained unit is in charge of operating the vehicles entire ABS system and has a data stream output that we can use for data and diagnostics. Here is my reverse engineering work on the Bendix 9 Adaptive Brake Module found in 89-90 Renix Jeeps.
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