9-5 Linear Sport Wagon (9600) L4-2.3L Turbo (B235) (2002)
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converted to a digital signal that is sent to the control module for calculation of the closest object.
The distance sensors are active when the control module is in mode 2 or 3, i.e. Active and Detected
The distance sensors work according to a loop (controlled by the control module), which is repeated 3 times per second. The loop is as follows:
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Step 1: Sensor 1 - RL - emits an ultrasound signal and listens with sensors 1 and 2.
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Step 2: Sensor 2 - RLC - emits an ultrasound signal and listens with sensors 1 and 2.
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Step 3: Sensor 2 - RLC - emits an ultrasound signal and listens with sensors 2 and 3.
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Step 4: Sensor 3 - RRC - emits an ultrasound signal and listens with sensors 2 and 3.
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Step 5: Sensor 3 - RRC - emits an ultrasound signal and listens with sensors 3 and 4.
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Step 6: Sensor 4 - RR - emits an ultrasound signal and listens with sensors 3 and 4.
After a completed loop, the control module checks the sensors and calculates using Pythagoras' theorem (a2+b2=c2) which object is closest to the rear or
side of the car, i.e. the object that the driver will be informed of.
Diagnostics
The control module monitors its own functionality and inputs and outputs.
The distance sensors are checked 10 times/second in modes 2 and 3.
In the event of a fault in a distance sensor or its communication with the control module, the following diagnostic trouble codes are generated:
