The Bendix TABS‑6 is an integrated trailer ABS controller and modulator that combines an electronic control unit (ECU) with a modulator relay valve (MRV) to manage air‑brake pressure during normal and ABS events. Common failure points for this class of units include power supply degradation, wiring or connector corrosion, sensor signal loss from wheel speed transducers, ECU firmware corruption, and mechanical wear in the MRV diaphragm or solenoid. First‑check diagnostics should verify 24 V DC supply continuity to the ECU, inspect all wiring harnesses and connectors for damage, confirm wheel‑speed sensor signals on the CAN/serial bus, and review any stored fault codes via the TABS‑6 diagnostic interface.[oss-gpt-20b]