Using an ODB reader, I get error code U0121, "ABS communication lost". The CEL is always lit, and sometimes ABS, TCS, and brake lights come on together while I'm driving. Braking is solid, with no problems.

The service manual talks about checking voltage across some of the pins on the connector, but I can't find a pinout diagram to know which pins they're talking about.

The dealership said they get their pinout information from the tech line. They can't call the tech line for me unless I put the car in the shop.

However, one of the techs suggested checking the rear brakes in addition to the other tests. Low brakes or dirty ABS sensors can give similar errors according to the tech.

Can anybody help find the pinout diagram for the ABS module?

Any other ideas?