Eric,
I don't recall seeing a formal list but there are many things that will trigger it. Different size tires
Defective wheel speed sensors
Defective brake light circuitry
Defective hidden micro switch on throttle linkage
Defective brake light switch
Defective OVP
And of course the ETA/wiring harness.
I am sure there are more. Maybe someone else could add to this.
Anziani
'93 300CE 200K
'95 E420 122K