Product Manual

PART 8: ABS BLINK CODE DIAGNOSTICS

The MUTT® can be used to access ABS Blink Codes on trailers equipped with

ABS systems. Trailers equipped with ABS feature an ABS Control Unit (ECU) which

detects any electrical fault in the trailer ABS. Most trailers with ABS will also have a

dedicated ABS lamp on the driver side. Each fault has a code. When a fault occurs,

the ECU stores the code for that fault in its memory. This fault code will be displayed

on the trailer ABS lamp when the proper access sequence is engaged.

ACCESSING ABS BLINK/FAULT CODES

The MUTT® provides a quick method to trigger ABS blink codes without a tractor

present. Depending on the system, you will need to selectively power the Auxiliary

and/or Brake Light Circuit in the correct order. Instructions on how to access several

of the most common ABS systems can be found below.

Once the correct manufacturer’s specic sequence is performed, you then must as-

sess the trailer ABS lamp. The number of blinks displayed on the trailer ABS lamp will

correspond to a specic ABS fault. As each manufacturer uses different access meth-

ods and each blink code has different meanings, the remainder of the ABS section will

be broken down by the brand of ABS system installed on the trailer you wish to test.

Note: ABS Manufacturer Access Protocols/Blink Codes are subject to change.

Please consult specic ABS manufacturer manuals for more detailed information and

any discrepancies in their literature shall supersede the following directions.