Parking Aid Module

PARKING AID MODULE

The parking aid module is located in the rear left hand side of the luggage compartment, behind the side trim panel.





The parking aid module uses a single microprocessor to perform the following tasks:
^ Control of the ultrasonic sensors
^ Monitoring of the sensors
^ Evaluation of received echo signals from the sensors
^ Noise and disturbance suppression
^ Control of the parking aid sounders
^ Monitoring of the sounders and leads
^ Control and monitoring of the switch status LED and lead
^ Evaluation and monitoring of the control inputs
^ Management of diagnostic and test functions
^ Monitoring of power supply
^ Communication via diagnostic link.

Parking Aid connector Pin Details





Connector C0957

Connector C0957:

Connector C01457

Connector C01457:

Connector C0958

Connector C0958:

Inputs and Outputs
Three connectors on vehicles with front and rear sensors and two connectors on vehicles with rear sensors only provide the interface between the parking aid module and the external parking aid components.

The module receives inputs from the following:
^ Reverse selected - CAN message from transmission control module (automatic transmission) or transfer box control module (manual transmission)
^ Forward gear selected (not in reverse or neutral) - CAN message from transmission control module (automatic transmission) or transfer box control module (manual transmission)
^ Parking aid switch
^ Parking brake applied - CAN message
^ Trailer fitted - CAN message for central junction box
^ Ignition switch - Power supply

The module outputs signals to the following:
^ Sensors - power and ground connections
^ Sensors - digital signal - transmit and receive signals
^ Rear sounder - varying frequency output
^ Front sounder - CAN message to instrument cluster
^ Parking aid switch - power supply for switch LED operation

Controller Area Network (CAN) Signals
The parking aid module sends and receives a number of digital signals via the medium speed CAN. The received signals are used for operation of the parking aid system. On vehicles with a high specification entertainment and information system, the transmitted signals, which represent distance to obstacle calculations from the sensors, are received by the integrated head unit and are used to display parking aid information on the touch screen display.

The parking aid module receives the messages shown in the following table which are used to control the parking aid system.





Diagnostics
The parking aid module has a diagnostic connection via the medium speed CAN to enable faults to be retrieved using T4. Additionally, an on-board diagnostic routine within the parking aid module constantly monitors the system and alerts the driver to a system fault by emitting a tone from the front or rear sounder, depending on the fault.

If a parking aid system fault has occurred, the parking aid module will relay the occurrence of the fault to the driver in the following ways:

^ The status LED will flash at a frequency of 2Hz if the system is active and fault is detected in the sensors, sounders, related wiring or the module.
^ The front sounder will emit an error tone for 3 seconds at a frequency of 1500Hz if a fault is detected with the front sensors or the rear sounder develops a fault.
^ The rear sounder will emit an error tone for 3 seconds at a frequency of 1500Hz if a fault is detected with the rear sensors, the switch, the LED in the switch or if there is a CAN bus error.