Land Rover Anti Lock Control Traction Control Rover Manual

•The battery is disconnected or battery voltage
decreases below 7.5 volts while the parking brake is
applied, so that the parking brake cannot be
electrically released.
The parking brake is mechanically released by
disconnecting the force sensor from the spline shaft in
the parking brake module. During normal operation, the
force sensor and the spline shaft are locked together by
a lever operated pawl on the end of the spline shaft,
which engages with a spigot on the force sensor.
The emergency release...

PARKING BRAKE INDICATORS
Red warning indicator (all except NAS)1
Amber warning indicator (all except NAS)2
Red warning indicator (NAS only)3
Amber warning indicator (NAS only)4
The parking brake has two warning indicators, one
amber and one red, located in the speedometer of the
instrument cluster.
Amber Parking Brake Warning Indicator
The amber parking brake warning indicator is
continuously illuminated if there is a parking brake
system fault. Operation of the indicator is controlled by
a high speed...

To apply or release the drum brakes, the parking brake
module runs the electric motor, which drives the
gearbox. The gearbox turns the spline shaft to increase
or decrease the tension in the brake cables. The parking
brake module monitors the load exerted by the brake
cables using the input from the force sensor.
Interior of Parking Brake Module
Electrical connector1
Housing2
Electric motor3
PCB4
Spline shaft5
Gearbox6
Force sensor7
Inputs and Outputs
A 32 pin electrical connector on the RH side of the...

Parking Brake Module Harness Connector C2178
Parking Brake Module Harness Connector C2178 Pin Details
Input/OutputDescriptionPin No.
-Not usedA1
Input/OutputHigh speed CAN bus low outA2
Input/OutputHigh speed CAN bus high inA3
Input/OutputHigh speed CAN bus low inA4
-Not usedB1
Input/OutputHigh speed CAN bus high outB2
InputParking brake switch SW1B3
InputParking brake switch SW4B4
-Not usedC1 and C2
InputParking brake switch SW2C3
OutputParking brake switch SW5C4
-Not usedD1 to E1
InputClutch pedal...

Input/OutputDescriptionPin No.
-Not usedG4
OutputGroundG2
-Not usedG3
InputBattery power supplyG4
-Not usedH1
OutputGroundH2
-Not usedH3
InputBattery power supplyH4
PARKING BRAKE OPERATION
The parking brake can be applied at any time provided
sufficient battery power is available. For the parking
brake to be released, various pre-conditions are required.
The parking brake has manual and automatic operating
modes, to cater for different operating circumstances,
as detailed in the following table:...

Driver ActionPre-ConditionsMode
Pull up parking brake
switch as required.
Vehicle speed more than 2.5 km/h (1.6 mph).Dynamic apply
Release (to neutral posi-
tion) or press down
parking brake switch.
Vehicle speed more than 2.5 km/h (1.6 mph).Dynamic release
None. Parking brake
released automatically on
drive away.
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%.
DAR...

NOTE: 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.
Sleep Mode
To reduce quiescent drain on the vehicle battery, the
parking brake module incorporates a sleep mode. The
parking brake module enters the sleep mode, provided
the ignition is off and there are no signals from the wheel
speed sensors, when one of the following...

module, and adjusts the tension of the brake cables
to achieve the required rate. During deceleration the
parking brake module also uses the wheel speed
inputs from the ABS module to operate an anti-lock
function for the rear wheels. When vehicle speed
decreases to 2.5 km/h (1.25 mph) the parking brake
module static applies the parking brake.
•Fallback 2 is invoked if there is a loss of
communication between the parking brake module
and the ABS module or the CAN bus has failed.
When fallback 2 is...

caused by incomplete operation of the parking brake
switch, the parking brake switch is re-enabled if the
parking brake module subsequently establishes a
plausible operating state.
If a single microswitch fault is detected, the parking
brake module signals the instrument cluster to illuminate
the amber parking brake warning indicator. On vehicles
with the high line instrument cluster, the parking brake
module also signals the instrument cluster to display a
message advising there is a parking brake...

PARKING BRAKE CONTROL DIAGRAM
NOTE: A = Hardwired connection; D = High speed CAN bus; N = Medium speed CAN bus
(G421073) Technical Training120
Lesson 2 – ChassisParking Brake