Software / firmware / ECU:
A break in the wiring loom within the steering wheel, or a loose connector at the clock spring or ECU, could generate a "signal change not present" error. However, since this code is isolated to the Favorites button alone (while other buttons function), a complete wiring break is less likely than a localized switch issue. mercedesbenz b1e9e2a
: "The 'Favorites' key sticks. Signal change is missing". Software / firmware / ECU: A break in
When this code becomes stored or active in the COMAND or MBUX control module, owners usually report a distinct set of electronic failures: mercedesbenz b1e9e2a