Frelander 2. Manual

Parking Aid -

General Specification

Item

Specification

Detection (Rear):

Center sensors

1800 mm (70.9 in)

Side sensors

600 mm (23.6 in)

Continuous tone

300 mm (11.8 in)

Detection (Front):

Center sensors

800 mm (31.5 in)

Side sensors

600 mm (23.6 in)

Continuous tone

300 mm (11.8 in)

Parking Aid - Parking Aid

Description and Operation

COMPONENT LOCATION

Item

Part Number

Description

Parking aid module

Front and rear audio speakers

Front parking aid sensor (4 off)

Parking aid switch

Integrated Control Module (ICM)

Power amplifier

Rear parking aid sensor (4 off)

OVERVIEW

Two levels of parking aid system can be fitted; a rear only system or a front and rear system.

The parking aid system provides an audible warning to the driver when any obstacles are in the path of the vehicle during
forward (if front sensors are fitted) or reverse parking manoeuvres. The system consists of four ultrasonic sensors in each
bumper, a parking aid module and a parking aid switch.

At low speeds, the parking aid module uses the ultrasonic sensors to monitor the area around the front and rear bumpers.
If an object is detected within a monitored area, the module then outputs a warning using the audio system speakers. The
sensors can detect solid objects such as posts, walls and other vehicles and can also detect less solid objects such as a
wire mesh fence. Objects very close to the ground may not be detected, but because of their low height may not cause
damage to the vehicle.

The parking aid system comprises the following components:

Parking aid module
Parking aid switch
Eight parking aid sensors.

The parking aid module communicates via the medium speed Controller Area Network (CAN) bus with the audio system via
the Integrated Control Module (ICM). The audio system then outputs the applicable warning tones from the front or rear
speakers when an object is detected. The medium speed CAN bus is also used to collect vehicle data from other vehicle
systems.

Parking Aid Module

The parking aid module is located on the Left Hand (LH) side of the luggage compartment, behind the 'C' pillar trim panel.

The parking aid module has three connectors which provide for power, ground and CAN bus connections, front parking aid
sensors and rear parking aid sensors.

The medium speed CAN bus connections provide for the receipt of the following information from other systems:

Anti-lock Brake System (ABS) module - Road speed signal
Transmission Control Module (TCM) - Reverse gear engaged signal
Trailer module - Trailer attached to vehicle
Instrument cluster - Ambient temperature signal.

The module also outputs messages on the medium speed CAN bus which are received by the Integrated Control Module
(ICM). The ICM processes these messages and converts them into Media Orientated System Transport (MOST) signals
which are passed to the audio system power amplifier. These signals are then used by the power amplifier to emit the
applicable warning tones from the front or rear audio speakers when an object is detected by the front or rear parking aid
sensors. A warning tone can also be emitted to alert the driver to a fault in the parking aid system.

The parking aid module performs self check routines and when the system is active checks the sensor wiring for short or
open circuits. If a fault is detected a code is stored in a memory in the module and if necessary either the front and/or rear
sensors can be disabled. The driver is made aware of any fault condition by the parking aid switch Light Emitting Diode
(LED) flashing and a continuous warning tone being emitted for 3 seconds, in place of the normal short tones when the
system is functioning normally. Fault codes can be read using the Integrated Diagnostic System (IDS) via the diagnostic
socket.

Parking Aid Sensors

Four ultrasonic sensors are located in the front and rear bumpers. Each sensor comprises a sensor and a bumper insert.
The insert ensures that each sensor is correctly orientated in relation to its location in the bumper.

Each sensor has a three pin connector which mates with a bumper harness, which in turn is connected to the main body
harness. Three pins provide for power supply, ground and signal lines to and from the parking aid module.

Each sensor comprises a plastic housing which contains a piezo electric disc. The disc resonates at a frequency of 34.8kHz,
producing the ultrasonic output. The disc also receives the reflected echo signal from any objects within range.

The parking aid module controls the operation of each sensor using a digital output on the signal line. The module controls
the sensor in one of two modes; combined transmitter and receiver mode or receiver mode only.

Parking Aid Switch

Item

Part Number

Description

Parking aid switch

The parking aid switch is located in the instrument panel switch pack, above the touch screen. The switch is the LH switch
with an integral LED.

The switch is a non-latching push switch which allows the driver to select the parking aid system on or off. W hen pressed,
the switch momentarily connects a ground to the parking aid module. The LED indicates when the parking aid system is
active. The LED is controlled by the parking aid module.

The switch allows the driver to disable the parking aid system when reverse gear is selected or to activate the parking
sensors when not in reverse gear.

If a fault exists in the parking aid system, the LED flashes continuously when reverse gear is selected or the driver selects
the parking sensors on, using the switch.

CONTROL DIAGRAM

• NOTE: A = Hardwired; N = Medium speed CAN Bus; P = Fiber Optic MOST

Frelander 2. Manual - part 450