Description

Parking Brake

NOTE:
A = Hardwired; D = High speed CAN (controller area network) bus.









STATIC APPLY
The EPB (electronic parking brake) module receives a vehicle speed signal from the ABS (anti-lock brake system) module on the high speed CAN (controller area network) bus. If the parking brake switch is pulled to the apply position and vehicle speed is less than 2 mph (3 km/h), the EPB (electronic parking brake) module will instigate the static apply mode and drive the actuator to apply full parking brake force to the rear wheels.
The EPB (electronic parking brake) module monitors the current drawn by the actuator and compares this to information held within its configuration software to determine when full braking force has been applied.

DYNAMIC APPLY
There are two dynamic apply modes; low speed dynamic and high speed dynamic. The low speed dynamic mode operates at speeds between 2 and 20 mph (3 and 32 km/h). The high speed dynamic mode operates at speeds above 20 mph (32 km/h).
If the parking brake switch is pulled up to the apply position and vehicle speed is within the low speed dynamic range, the EPB (electronic parking brake) module drives the actuator to apply full parking brake force to the rear wheels.
If the parking brake switch is pulled up to the apply position and vehicle speed is within the high speed dynamic range, the EPB (electronic parking brake) module will apply braking force to the rear wheels at a slower rate until full braking load is reached or the switch is released. The rate with which braking force is applied is controlled by the EPB (electronic parking brake) module, which monitors both current drawn by the actuator and positional information from the actuator hall sensor and compares this to information held within its configuration software.

DRIVE AWAY RELEASE
The EPB (electronic parking brake) module will initiate a drive away release function and automatically release the parking brake if the following conditions are detected:
- The engine is running.
- Drive or reverse is selected.
- Positive throttle movement is detected.
The EPB (electronic parking brake) module receives messages of gear selector position and throttle angle over the high speed CAN (controller area network) bus from the TCM (transmission control module) and the ECM (engine control module) respectively.

RELEASE FROM PARK
The EPB (electronic parking brake) module will initiate the release from park function and automatically release the parking brake if the gear selector is moved from P (park).

REPAIRS
Before carrying out any work on the parking brake system, use Jaguar approved diagnostic equipment to perform the service routine to release cable tension. The routine can be found in the vehicle configuration area, under the set-up and configuration menu. After any work has been carried out on the parking brake, the system will require resetting.

CAUTION: Do not use the emergency release tool to allow work to be carried out on the parking brake. Work can only be carried out on the parking brake system after the service routine to release cable tension has been run.

RESETTING
If the electrical supply is disconnected from the EPB (electronic parking brake) module, the position memory will be lost. On battery re-connection and ignition on, Apply Foot And Park Brake will be displayed in the instrument cluster message center indicating the parking brake requires resetting. For additional information, refer to Parking Brake Testing and Inspection

OPERATING VOLTAGES
The EPB (electronic parking brake) module will only operate the actuator if the power supply from the battery is between 9 and 16 V. At any voltage within this range, the actuator is able to fully tighten and release the brake cables. If the power supply falls outside of the range, a fault code is stored in the EPB (electronic parking brake) module and can be retrieved using Jaguar approved diagnostic equipment.

PARKING BRAKE SWITCH





The parking brake switch is mounted in the floor console, rearward of the rotary gear selector. The switch has three states:
- Apply: When the switch is pulled up to apply the parking brake.
- Release: When the switch is pushed down to release the parking brake.
- Neutral: The central default position. The switch returns to this position regardless of parking brake status.
The parking brake switch contains a pair of micro-switches for both the apply and release actions. The EPB (electronic parking brake) module provides an individual hardwired electrical feed to each of the four micro-switches plus a single ground connection, allowing it to constantly monitor switch status.

EPB MODULE





The EPB (electronic parking brake) module is mounted in the luggage compartment on the RH (right-hand) side quarter panel and is connected to the vehicles electrical wiring by two multiplugs. The EPB (electronic parking brake) module is connected to the high speed CAN (controller area network) bus, allowing it to communicate with other vehicle systems.
The EPB (electronic parking brake) module monitors the condition of the parking brake switch through a series of hardwired electrical connections and controls operation of the parking brake actuator accordingly.

PARKING BRAKE ACTUATOR





The parking brake actuator is mounted on the back of the rear subframe. Operation of the actuator is controlled by the EPB (electronic parking brake) module in response to parking brake switch requests from the driver.
A Hall sensor is located within the actuator and provides positional information back to the EPB (electronic parking brake) module. The principle function of the Hall sensor is to ensure the actuator fully releases the parking brake when a static release request is made. The signal provided by the Hall sensor is compared to configuration information contained within the EPB (electronic parking brake) module software to determine when a full release has been carried out.

STOPLAMP SWITCH





The stoplamp switch is mounted on the brake pedal mounting bracket. One of the prerequisites for releasing the parking brake is that the foot brake is applied. The EPB (electronic parking brake) module is able to determine the position of the foot brake by monitoring the status of the stoplamp switch via a hardwired electrical connection.
The stoplamp switch also supplies status signals to the CJB (central junction box) and the ECM (engine control module).

INSTRUMENT CLUSTER
The instrument cluster contains a red warning indicator for the EPB (electronic parking brake). The warning indicator is permanently illuminated while the EPB (electronic parking brake) is applied. If the warning indicator flashes, the EPB (electronic parking brake) has an electrical fault.
If there is an EPB (electronic parking brake) fault, the message Cannot Apply Park Brake or Park Brake Fault appears in the instrument cluster message center. If the vehicle is moving with the parking brake applied, the message Caution! Park Brake Applied appears in the message center accompanied by a chime from the instrument cluster. For additional information, refer to Information and Message Center Locations