ECAS Dash Switches

Vehicles with Electronically Controlled Air Suspension (ECAS) may be equipped with either dash switches (see Fig.) or a remote control unit, not both.

LOAD XFER (Load Transfer)

This switch controls the ECAS Manual Load Transfer function by adjusting suspension air pressure. Use this function to minimize wheel slippage in road conditions where traction may be a concern.

The ECAS Load Transfer feature applies the maximum available vehicle load on the drive axle, up to the maximum allowable limit, determined by the gross axle weight rating (GAWR). In bobtail or with a loaded trailer less than the GAWR, the tag axle supports a negligible load while the drive axle supports nearly the full weight. Above the GAWR, the drive axle is loaded with approximately the maximum allowable load and the tag supports the remainder.

Load transfer mode can be deactivated by holding up on the dash switch for 4 seconds. Load transfer mode will automatically deactivate when the vehicle reaches 45 mph (72 kmh).

When Load Transfer mode is active, "Load Transfer" will display in the message field of the driver message center. See Fig..

SUSP HGT (Suspension Height)

If the suspension is at normal height:

• each up press increases the suspension height an increment, unless the suspension is at maximum height

• a down press lowers the suspension to its lowest set-point (usually axle stops)

If the suspension is below normal height:

• an up press increases the suspension height to normal ride height

• a down press does nothing; the suspension is already at its lowest point

If the suspension is above normal height:

• each up press increases the suspension height an increment, unless the suspension is at maximum height

• a down press lowers the suspension to normal ride height

Messages about the ride height status will display in the message field of the driver message center. See Fig..

If the suspension is outside normal ride height (amber lamp on), the ECAS system will automatically return the suspension to normal ride height when vehicle speed reaches or exceeds a set speed (usually set to 5 mph).

ECAS Standby Mode, Dash Switch

Once the key is turned off, the ECAS will enter Standby mode, remaining powered and adjusting to level and load changes for 1 hour. To cancel Standby mode on vehicles with ECAS dash switches, turn the key from OFF to ON to OFF in less than 1.5 seconds. Confirm the deactivation of standby mode by pressing the SUSP HGT switch, which should not adjust the suspension.