CHECK FOR INTERMITTENT PROBLEMS HINT: Inspect the vehicle's ECM using check mode. Intermittent problems are easier to detect with the Techstream when the ECM is in check mode. In check mode, the ECM uses 1 trip detection logic, which is more sensitive to malfunctions than normal mode (default), which uses 2 trip detection logic.
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Toyota Tundra Service Manual > Trailer Brake Control System: Control Module Communication Bus "A" Off (U0073,U0123,U0129,U0155)
DESCRIPTION The trailer brake control ECU (brake control with bracket relay) receives signals from the skid control ECU (brake actuator assembly), yaw rate and acceleration sensor (airbag sensor assembly) and combination meter assembly via CAN communication. DTC No. Detection Item INF Code DTC Detec ...