Alerts
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| Signal Name | Description | Condition | Impact |
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Stability Control reports Controlled Deceleration for Parking Brake is not available when car is in DRIVE.
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(ESP_cdpStatus == CDP_IS_NOT_AVAILABLE or VCLEFT/VCRIGHT_okayToRequestCDP == EPB_EXTERNAL_APPLY_INVALID) when VCFRONT_vehiclePowerState == VEHICLE_POWER_STATE_DRIVE
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Electronic Parking Brake Monitor and/or Stability Control are faulted, Controlled Deceleration for Parking Brake cannot be performed
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One Electronic Parking Brake (EPB) not applied, and road grade is too steep to secure vehicle with only one EPB.
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Only one Electronic Parking Brake (EPB) applied and grade too steep for one EPB to hold the vehicle
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Car may not be secured by Electronic Parking Brake on current road grade, may be free rolling
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Road grade is too steep to secure with Park Brake.
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Attempt to engage parking brake when the vehicle is stopped on too steep a road grade for Electronic Parking Brake to secure the vehicle
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Car may not be secured by Electronic Parking Brake on the current road grade, may be free rolling
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Customer facing alert issued when Electronic Parking Brake is applied at higher than 5mph.
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Entry to states ESM_DYNAMIC, ESM_DYNAMIC_EXTERNAL, ESM_DYNAMIC_PENDING
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User facing notification that informs Electronic Parking Brake is dynamically applying
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Customer facing alert for Electronic Parking Brake issues which occur when caliper is not moving.
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Electronic Parking Brake has idle fault, or CSM_RQST_INVALID/CSM_RQST_NONE during retry or fault
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Electronic Parking Brake caliper motor may be disconnected (idle fault), or no csm requests during retry/fault
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Electronic Parking Brake was not able to determine caliper state on boot.
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Caliper state saved is unknown, corrupted, or mismatches Electronic Parking Brake Monitor
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Problem with initializing Electronic Parking Brake
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Electronic Parking Brake apply was interrupted. Apply will be retried.
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(unitFaultStatus == FAULT_STATUS_RETRY) && (csmRequest == apply) && (stateRequest != ESM_DYNAMIC)
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Electronic Parking Brake did not apply, it will retry an apply and enter fault if retry fails
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Electronic Parking Brake apply failed.
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Electronic Parking Brake faulted during apply && (nonterminal == FALSE)
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Electronic Parking Brake apply in progress will be stopped due to the fault, caliper may not be fully applied
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Electronic Parking Brake release was interrupted. Release will be retried.
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(unitFaultStatus == FAULT_STATUS_RETRY) && (csmRequest == release)
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Electronic Parking Brake did not release, it will retry a release and enter fault if retry fails
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Electronic Parking Brake was unable to release due to fault.
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Electronic Parking Brake faulted during release && (nonterminal == FALSE)
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Electronic Parking Brake release in progress will be stopped due to the fault, caliper may not have fully released
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The communication link between Electronic Parking Brake (EPB) and Electronic Parking Brake Monitor (EPBM) is not functioning as expected.
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Either the Cyclic Redundancy Check (CRC) check has not completed as expected, or a message has not been received for 100ms. Alert disabled during over-the-air (OTA) firmware updates.
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Electronic Parking Brake will not apply or release.
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The battery voltage measurement, nominally 12 volts, was lower than expected.
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The vbat voltage measurement, is lower than 6.0 volts. If the measurement is lower than 0.25 volts, we do not set this alert, as this would indicated the switch supply is disabled.
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12V Battery or low voltage systems may be damaged
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The battery voltage measurement, nominally 12 volts, was higher than expected.
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The vbat voltage measurement is higher than 18.5 volts.
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12V Battery or low voltage systems may be damaged
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EPB_w050_resetRequired
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The Electronic Parking Brake made an unexpected state transition.
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Electronic Parking Brake moved between states that are not marked as having a valid transition.
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Logical bug in the software
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The Electronic Parking Brake or Electronic Parking Brake Monitor took longer than expected to save caliper state in non-volatile memory.
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Caliper state saved to Electronic Parking Brake and Electronic Parking Brake Monitor mismatched for more than 500ms
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Non-volatile memory error due to Electronic Parking Brake and Electronic Parking Brake Monitor mismatch
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The Electronic Parking Brake and Electronic Parking Brake Monitor took longer than expected to save caliper state in non-volatile memory.
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Caliper state saved to Electronic Parking Brake and Electronic Parking Brake Monitor mismatched
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Non-volatile memory error due to Electronic Parking Brake and Electronic Parking Brake Monitor mismatch
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Motor positive lead voltage is lower than expected while active.
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The positive lead voltage measurement is lower than expected. The expected value is the lower of 16.5 volts, or the estimated PWM voltage.
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Caliper motor or harness may be damaged
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Motor positive lead voltage is higher than expected while active.
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The positive lead voltage measurement is higher than expected. This could be higher than 0.1 voltages if motor is driven in release direction, or higher than estimated PWM voltage if driven in the apply direction.
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Caliper motor or harness may be damaged
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Motor negative lead voltage is lower than expected while active.
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The negative lead voltage measurement is lower than expected. The expected value is the lower of 16.5 volts, or the estimated PWM voltage.
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Caliper motor or harness may be damaged
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