APP_w399 — Brakebooster Mia
Full alert identifier: APP_w399_brakeboosterMia
Alert description
One or more of the messages the Autopilot electronic control unit (ECU) receives periodically from the Brake Booster (BB) is not received on the Party bus, indicating the brake ECU may be unavailable (MIA).
Potential impact
Autopilot features such as Traffic-Aware Cruise Control (TACC) may be unavailable, or may not function as expected.
Set condition
One or more of the expected messages from the Brake Booster (BB) is not received on the Party bus.
Clear condition
The Autopilot ECU starts receiving expected messages from the Brake Booster (BB) on the Party bus.
Signals to check
These diagnostic fields are associated with APP_w399. Check the alert's Alert Log in Service Mode Plus for available values.
| Signal | Unit |
|---|---|
Status
APP_
|
— |
Check other alerts
With Service Mode Plus enabled, open Service Alerts → All. Review the other alerts for clues to the cause of APP_w399.