Trailer ABS Lamp Operation

SD DM 12.01.02

Antilock Braking Systems (ABS) on tractors are designed to communicate with trailer ABS systems, if they are compatible. Compatibility will result in the illumination of the trailer ABS lamp during vehicle start-up and fault detection.

The dash-mounted lamp will operate as follows when a compatible trailer is properly connected to a tractor:

  • When the ignition key is turned to the ON position, the trailer ABS lamp will illuminate momentarily, then turn off.

  • If the lamp comes on momentarily during vehicle operation, then shuts off, a fault was detected and corrected.

  • If the lamp comes on 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.

The Trailer ABS lamp will not illuminate unless a compatible trailer is connected to the tractor.

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.

Note:
Parent topic: Meritor WABCO® Antilock Braking System (ABS)
Document Number: 0000123386
Manual Publication Date: 2025-01-23
Topic Publication Date: 2025-01-23