Hold Function
The hold function eases the strain of driving in stop-and-go traffic by allowing the driver to 'hold' the brake without constantly applying pressure to the brake pedal. The hold function is an extension of Hill Start Aid (HSA).
To activate the hold function, bring the vehicle to a complete stop, then press the brake pedal further toward the floor. The HOLD telltale, shown in Fig. illuminates on the driver display to indicate the function is active and the vehicle's brake lights come on. The driver can then take their foot off the brake pedal without the service brakes releasing.
If the brake pedal is pressed down farther, air is added to the chamber, continuing the brake hold.
Fig. 1, Brake Hold Active Telltale
To release the brake hold, do one of the following:
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Press the accelerator pedal.
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Engage the park brake.
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Pressing the brake pedal to full stroke and immediately release the brake pedal.
The hold function is deactivated when the HSA OFF switch is pressed to disable HSA.
The hold function is deactivated when the HSA OFF switch is pressed to disable HSA.
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The anti-lock braking system was active in bringing the vehicle to a stop;
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The anti-lock braking system is in a fault state;
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The vehicle is in reverse gear.
If the hold function is active for four minutes, the window shown in Fig. appears on the ICU, warning the driver to engage the park brake. An audible alarm activates at the same time and repeats every minute until the park brake is set.
Fig. 2, Engage Park Brake Message - ICC5
The same warnings are triggered if the hold function is active and:
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The ignition is turned off without the park brake being set;
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The brakes are not strong enough to hold the vehicle in place and it starts rolling.
If a door is opened without the park brake being set when the hold function is active, the horn sounds and a visual warning activates on the driver display. If the seat occupancy sensor registers an empty seat under the same conditions, the same warnings are triggered. Warnings cease when the condition that triggered the warning is corrected.