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Appendix 1 Trailer ABS Indicator Lamp on Vehicle Dash The trailer ABS indicator lamp on vehicle dash applies to Trailer ABS only. The lamp is controlled by a signal to the tractor ECU, which is sent over the power line (PLC function). When a trailer ABS fault is detected, an ON message is sent. When no fault is detected, the ECU receives an OFF message. Table D illustrates trailer ABS lamp operation at power-up or ignition on. Table E depicts lamp responses that occur during operation. Lamp turn ON and OFF messages do not turn the lamp ON or OFF instantly. The delay between the receipt of the message and the lamp response time is intentional, because it prevents erratic lamp activity. NOTE: For doubles or triples, the lamp does not distinguish between trailers. A system fault in any of the trailers will activate the trailer ABS indicator lamp. Table D: Dash-Mounted Trailer ABS Indicator Lamp Operation-- Bulb Check (Information for Drivers) |
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