206-05 Parking Brake: Description and Operation - Page 506
Operating Voltages
Actuation of the parking brake (apply or release) is only started if the power supply to the parking brake module is within 9
to 18 volts. At any voltage in this range, the parking brake module is able to tighten the brake cables to the maximum, to
fully apply the parking brake, although at voltages between 9 and 10.5 volts the actuation time may exceed 1.0 second.
During a parking brake actuation:
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If the power supply to the parking brake module decreases to less than 8.3 volts, the parking brake module
continues the actuation, but stores a related fault code. If the ignition is on, the parking brake module also signals
the instrument cluster to illuminate the amber parking brake warning indicator and flash the red parking brake
warning indicator. On vehicles with the high line instrument cluster, a message advising there is a parking brake
fault is shown in the message center. The warning indications are discontinued if the power supply voltage
increases to 8.3 volts or more.
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If the power supply voltage decreases to less than 7.5 volts, the parking brake module discontinues the actuation.
Actuation is automatically resumed if the power supply voltage subsequently increases to 7.5 volts or more and
the parking brake switch request is still valid.
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If the power supply voltage decreases below 6.5 volts, the parking brake function is disabled for the remainder of
the ignition cycle.
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If the power supply voltage increases to more than 18.0 volts, the parking brake module immediately disables the
parking brake function and stores a related fault code. If the ignition is on, the parking brake module also signals
the instrument cluster to illuminate the amber parking brake warning indicator and flash the red parking brake
warning indicator. On vehicles with the high line instrument cluster, a message advising that the parking brake has
a fault and is not functioning is shown in the message center. The parking brake function remains disabled until
the power supply voltage is within 9 to 18 volts again. When the power supply voltage is within 9 to 18 volts again,
the warning indications are cancelled and actuation is automatically resumed if the parking brake module is in a
dynamic mode of operation with a valid parking brake switch request.
NOTE:
Sleep Mode
Mode
Pre-Conditions
Driver Action
Static apply
Vehicle speed less than 2.5 km/h (1.6 mph).
Pull up parking brake
switch.
Static release
1. Vehicle speed less than 2.5 km/h (1.6 mph). 2. Engine running.
OR Ignition switch in position II and brake pedal or clutch pedal
pressed (manual transmission). OR Ignition switch in position II and
brake pedal or accelerator pedal pressed (automatic transmission).
Press down parking brake
switch.
Key out apply
(Manual transmission
only)
1. Vehicle speed less than 10 km/h (6.25 mph). 2. Ignition switch in
position 0. 3. Key in ignition switch.
Remove key from ignition
switch.
Key out apply inhibit
1. Vehicle speed less than 2.5 km/h (1.6 mph). 2. Ignition switch in
position 0. 3. Key in ignition switch.
Remove key from ignition
switch while pressing
down parking brake
switch.
Dynamic apply
Vehicle speed more than 2.5 km/h (1.6 mph).
Pull up parking brake
switch as required.
Dynamic release
Vehicle speed more than 2.5 km/h (1.6 mph).
Release (to neutral
position) or press down
parking brake switch.
Drive Away Release
(DAR) (automatic
transmission only)
1. Ignition switch in position II. 2. Transmission in gear 1, 2 or R
(with high range selected) or 1, 2, 3 or R (with low range selected).
3. Accelerator pedal pressed more than 5%.
None. Parking brake
released automatically on
drive away.
The instrument cluster shuts down below 8 volts, so warning indications and messages are not displayed below 8
volts. CAN transmission stops if battery voltage drops below 7.0 volts and re-starts when voltage goes above 7.5
volts.
