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The trailer ABS lamp never lights at all during the power-up check. Why is that a concern worth reporting?
- A.It proves the ABS is so reliable it needs no lamp
- B.A lamp that never lights means the trailer brakes are locked
- C.The lamp or the ABS itself may be dead, so you would get no warning of a fault and may have no antilock function; it should be checked and repaired
- D.It is normal for the lamp to work only at night
Correct answer
C. The lamp or the ABS itself may be dead, so you would get no warning of a fault and may have no antilock function; it should be checked and repaired
Why
A warning system that cannot light is the same as having no warning system. Since you cannot tell a healthy ABS from a failed one without the check lamp, the defect is reported like any other brake fault.
Manual topic: Combination Vehicles - Trailer ABS · From the Combination Vehicles practice bank (CV-207).