DI_a106 — Trailer Brake Backup State

Full alert identifier: DI_a106_trailerBrakeBackupState

Alert description

The drive interface (DI) electronic control unit (ECU) detects Trailer Brake Control functionality may be reduced.

Potential impact

Trailer brake control is in a backup state that mimics a time delay brake controller. Trailer brakes are applied when the driver presses the brake. This can be reduced with the gain. The vehicle should be driven with caution.

Set condition

Trailer brake control is in a backup state due to one or more invalid system input(s). Alert log signal data should provide more information on any invalid input(s) detected.

Clear condition

This alert will clear on the drive cycle after trailer brake control is re-enabled or no condition affecting functionality is detected.

Signals to check

These diagnostic fields are associated with DI_a106. Check the alert's Alert Log in Service Mode Plus for available values.

Signal	Unit
IBST Stroke Act Valid `DI_a106_IBSTStrokeActValid` 0 INVALID 1 VALID	—
Abs Brake Event Active Valid `DI_a106_absBrakeEventActiveValid` 0 INVALID 1 VALID	—
All Motor Torques Valid `DI_a106_allMotorTorquesValid` 0 INVALID 1 VALID	—
All Wheel Speeds Valid `DI_a106_allWheelSpeedsValid` 0 INVALID 1 VALID	—
Any Abs Active `DI_a106_anyAbsActive` 0 INACTIVE 1 ACTIVE	—
Brake Master Cyl Press Valid `DI_a106_brakeMasterCylPressValid` 0 INVALID 1 VALID	—
Duty Cycle Request Manual `DI_a106_dutyCycleRequestManual`	%
Max Regen Power `DI_a106_maxRegenPower`	kW

Show 4 more fields

Signal	Unit
Musurf High `DI_a106_musurfHigh`	—
Trailer Brake Duty Cycle Request `DI_a106_trailerBrakeDutyCycleRequest`	%
Trailer Brake State `DI_a106_trailerBrakeState` 0 OFF 1 STARTUP 2 NORMAL 3 BACKUP 4 FAULTED	—
Wheel Brake Torques Valid `DI_a106_wheelBrakeTorquesValid` 0 INVALID 1 VALID	—

Check other alerts

With Service Mode Plus enabled, open Service Alerts → All. Review the other alerts for clues to the cause of DI_a106.