Brake module failure

[Simpo Two]

Two warning lights have been on for a couple of months - 'Traction control system off' and 'DSC service required'. Today I got them looked at by a recommended indy during a routine service. We'd hoped they might be caused by a poor battery, but it was tested and is fine. He says this means the brake module could be faulty or have a loose connection, and that it could be difficult to investigate/solve. Can anyone throw any light on the subject please? 2007 DB9, 30K miles.

[DB9S Paul]

I assume he read the codes, that should give more information, could be just a speed sensor.

[Simpo Two]

DB9S Paul said:

I assume he read the codes, that should give more information, could be just a speed sensor.

He had an Autel code reader but not AMDS.

[LTP]

Just semi-educated guessing here, so don't let me raise your hopes, but if you don't have an ABS warning as well that to me implies the ABS system is working OK, which requires the brake module to function correctly. Similarly the ABS system requires the speed sensors of all four wheels to function, otherwise it can't detect a locking wheel. There are quite a few other bits like pumps, pressure sensors and the yaw sensor in the system required to make the DSC and traction work.

A good tech with AMDS should be able to see which component is registering DTCs, so it may not be the main module. It's possible an Autel won't give the full suite of codes, so I think I'd take it to someone with the right diagnostic kit before you let your indy start playing "swap the parts".