IDB_a004 — Supply Undervoltage
Full alert identifier: IDB_a004_supplyUndervoltage
Alert description
The IDB reports a low power supply voltage.
Potential impact
Only brake boost is available. Electronic Brake Distribution (EBD), Anti-lock Brake System (ABS), Brake Traction Control (BTC), Vehicle Stability Control (VDC), Panic Brake Assist (PBA), Hydraulic Fade Compensation (HFC), Controlled Deceleration via Parking Brake (CDP), Brake Disc Wipe (BDW), External Brake Request (EBR), and Secondary Collision Mitigation (SCM) may be unavailable. Brake pressure is limited to 100 bar. The vehicle should be driven with extreme caution.
Set condition
Power supply voltage is less than 9V for 500 milliseconds.
Clear condition
Clears when power supply voltage is greater than 9.5V for 500 milliseconds.
Check other alerts
With Service Mode Plus enabled, open Service Alerts → All. Review the other alerts for clues to the cause of IDB_a004.