Home › CDL Practice Tests › Combination Vehicles Questions › Question 196
What should the trailer ABS malfunction lamp do when you first power up / start the vehicle, if the system is healthy?
- A.Stay on steadily for the entire trip
- B.Come on briefly for a bulb/system check and then go out
- C.Never come on at all, even at startup
- D.Flash in time with the turn signals
Correct answer
B. Come on briefly for a bulb/system check and then go out
Why
A brief lamp at startup proves the bulb works and the system has run its self-check without finding a fault. A lamp that never lights cannot warn you later, and one that stays on is reporting a problem.
Manual topic: Combination Vehicles - Trailer ABS · From the Combination Vehicles practice bank (CV-196).