Model: E38, E39 and E53
Production: Start of Production
System Operation
When KL15 is switched "ON", the PDC system is switched "ON", in the standby mode. The system performs a self-check of the ultrasonic sensors and control electronics.
When the transmission is shifted into reverse, the system is activated and the sensors are activated in the pre-determined order.
The system stays active up to approximately 20 MPH. Above this, the system reverts to the standby mode.
If an object is detected within the operating range of the sensors, the control module will activate the respective gong/speaker (front/rear). The sensor closest to the object will receive additional activations to determine if the object is getting closer.
As the distance to the object decreases to approx. 1 1/2 feet, the control module increases the activation frequency of the sensor. The output frequency of the gong will increase linearly up to a distance of approx. 3/4 of a foot. At this time the frequency will change to a constant tone.
As the distance to the object increases, the frequency of the sensor and gong activation decreases until the object is out of the monitoring range of the sensor.
Scheme 259
Cruise Control Switch Operation
When the main switch is turned on and the vehicle speed is above 20 mph, the cruise control can be set or adjusted at the cruise control switch pad.
Resume - Briefly pressing the resume button will cause the vehicle to accelerate/decelerate to the stored speed value in the cruise control module.
Set/Accelerate/Tip Up - Pressing the set button will engage the cruise system and maintain the vehicle's current speed. Pressing and holding the set button will cause the vehicle to accelerate. When released, the vehicle's current speed will be the set speed.
Tapping the set button will cause the speed to increase by approx. 1 MPH. The number of times the tip feature will function is limited to 8.
Decelerate/Tip-Down - Pressing and holding the decelerate button will cause the vehicle to slow down. When the button is released, the current speed is the new set speed. Tapping the button will cause the vehicle speed to decrease by approx 1 MPH. The number of times the tip feature will function is limited to 8.
OFF - Pressing the off button will disengage the cruise control. The previous set speed is stored in memory until it is overwritten or the vehicle is switched off. In addition to switching off via the cruise control switch on the steering wheel, the system can also be switched off by
- Depressing the main switch on the instrument panel.
- Applying the brakes.
- Shifting the transmission into neutral.
Operation
When KL 15 is switched ON, the heated wheel can be switched ON by pressing the button.
A green LED illuminates to indicate system operation. Maximum current is supplied and heats the filament to its operating temperature (surface temperature of approximately 90°F).
The NTC detects the temperature of the filament and causes the control module to cycle once the wheel is heated. Cycling is carried out with a pulse width modulated signal.
The system is not connected to the diagnostic link, however the control module does monitor operation of the system. If a fault occurs during operation, the system and green LED will switch OFF.
