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 during vehicle start-up and fault detection. See Table..
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:
Table 1, Brake System Warnings, Indicators, and Messages
|
Brake System Warnings, Indicators, and Messages |
||||
|---|---|---|---|---|
|
Telltale |
Color |
Description |
Driver Display |
|
 |
Red |
Low Air Pressure (EPA10 and Newer) |
Indicates air pressure in the primary or secondary reservoir has dropped below approximately 70 psi (483 kPa). A buzzer will also sound if the park brake is released or if the vehicle is moving--depending on vehicle options. |
 |
 |
Red |
Parking Brake (EPA10 and Newer) |
Indicates the parking brake is engaged. |
N/A |
 |
Amber |
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. |
N/A |
 |
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. |
N/A |
 |
Amber |
Stability Event |
Flashing indicates a stability event has been detected, and the ESC system is active. Solid illumination indicates a problem with the stability system. Repair the ESC system immediately to ensure full stability capability. For more information on the ESC system, see General Description, Standard Adaptive Cruise Control. |
N/A |
 |
Amber |
Wheel Spin Event |
Flashing indicates a wheel spin event has been detected, and the ATC system is active. |
N/A |
 |
ATC Deactivated |
Indicates the ATC SPIN button has been pressed to allow wheel slip. |
 |
|
 |
Green |
Engine Brake |
Indicates the engine brake is enabled. |
N/A |
Table 1, Brake System Warnings, Indicators, and Messages
-
When the ignition key is turned to the ON position, the TRAILER ABS lamp will illuminate momentarily, then turn off.
-
If the lamp illuminates momentarily during vehicle operation, then shuts off, a fault was detected and corrected.
-
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.