DPB_a257 — Valve Relay On Continuous
Full alert identifier: DPB_a257_valveRelayOnContinuous
Alert description
VR can not be switched off.
Potential impact
System will be running in fully degraded state. Braking may require increased effort. Hydraulic Boost Compensation will be triggered when driver pressed brake pedal.
Set condition
(1) UVR voltage does not fit to the target VR state, Comparing UVR and UBVR. (2) VR does not switch off in hydraulic failsafe state, Comparing UVR and UBVR.
Clear condition
No internal issue is detected after changing operation cycle. If the condition persists, the DPB module may require replacement.
Check other alerts
With Service Mode Plus enabled, open Service Alerts → All. Review the other alerts for clues to the cause of DPB_a257.