Trailer ABS 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 (see Table.) during vehicle start-up and fault detection.
Table 1, Brake System Warning and Indicator Lamps
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Brake System Warning and Indicator Lamps |
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Lamp Description |
Color |
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 |
Low Air Pressure (EPA10 and Newer) |
Indicates air pressure in the primary or secondary reservoir has dropped below approximately 70 psi (483 kPa). |
Red |
 |
Low Air Pressure (ICU4Me only, mid-GHG14) |
Indicates air pressure in the primary or secondary reservoir has dropped below approximately 70 psi (483 kPa). |
— |
 |
Parking Brake |
Indicates the parking brake is engaged. |
Red |
 |
Vehicle ABS |
Momentary illumination indicates the vehicle ABS is engaged. Solid illumination indicates a problem with the vehicle ABS. Repair the ABS immediately to ensure full braking capability. |
Amber |
 |
Trailer ABS |
Momentary illumination indicates the trailer ABS is engaged. Solid illumination indicates a problem with the trailer ABS. Repair the ABS immediately to ensure full braking capability. |
Amber |
 |
Wheel Spin |
Flashing indicates the ATC system is active, or the ATC button has been pressed to allow wheel slip. Solid illumination indicates a problem with the ATC system. Repair the ATC system immediately to ensure full braking capability. |
Amber |
 |
Engine Brake |
Indicates the engine brake is enabled. |
Green |
Table 1, Brake System Warning and Indicator Lamps
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.