ABS, Trailer Compatibility
The Meritor WABCO ABS is designed to communicate with a trailer ABS, if they are compatible. Compatibility will result in the illumination of the trailer ABS lamp during vehicle start-up and fault detection. See Fig..
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ATC Warning Light
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Tractor ABS Warning Light
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Trailer ABS Warning Light
Fig. 1, ABS Dash Lights
The trailer ABS lamp will not illuminate unless a compatible trailer is connected to the tractor. The dash-mounted lamp will operate as follows when a compatible trailer is properly connected to the tractor:
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When the ignition key is turned to the ON position, the trailer ABS lamp will illuminate momentarily, then turn off.
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If the lamp illuminates momentarily during vehicle operation, then shuts off, a fault was detected and corrected.
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If the lamp illuminates and stays on during vehicle operation, there is a fault with the trailer ABS. Repair the trailer ABS system immediately to ensure full antilock braking capability.
Important: If a compatible trailer is connected, and the lamp is not illuminating momentarily when the ignition key is turned to the ON position, it is possible that the lamp is burnt out.