Each system has its own procedure, so you must know the correct procedure for the system you’re servicing.įault code reading and clearing from the 7-pole socket is beyond the scope of our equipment. Many ABS systems have self-diagnosing abilities too, blinking out fault codes on the ABS status light, or illuminating LEDs on the controller. Testing these systems is simply a matter of using your Square Wheel Industries Trailer Lighting Tester to power these two circuits and allowing the ABS to test itself. Other systems self-test each time the stoplight circuit is powered (minus the chuffing). If the ABS status light fails to light up, blinks, or comes on and stays on, an ABS fault is indicated. The ABS status light comes on for 3 to 5 seconds, and you might hear the air valves “chuffing”. During startup, when the auxiliary circuit is first powered, the ABS runs a self-check. Trailer ABS systems contain an on-board computer with self-testing and diagnostic capabilities.
