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Scheme 2
Scheme 3
Circuit/System Description
The B218L Side Object Sensor Module - Left or B218R Side Object Sensor Module - Right can set this code if the module determines there is a fault due to the reason listed in the symptom byte.
Two Side Object Sensor Modules are located on each side of the vehicle near the corners of the rear fascia. The modules are provided with B+ and ground. The Side Object Sensor Module - Right has an additional ground to distinguish it from the Side Object Sensor Module - Left. The Side Object Sensor Module - Left is connected to the serial data line. The serial data line is passed through the module to the Side Object Sensor Module - Right.
When vehicle speed is greater than 10 km/h (6.2 MPH) and either Side Object Sensor Module detects an object in the detection area, the module provides a signal to the appropriate Outside Rearview Mirror to illuminate the amber telltale LED.
The object sensors are 3-wire sensors that are used to determine the distance between the vehicle and an object of interest. The rear parking assist control module supplies 8 V to the object sensors via the 8 V reference circuit and provides ground via the low reference circuit. The rear parking assist control module triggers the sensors in a sequential loop. After each sensor transmits, the rear parking assist control module uses the sensor echo received through the signal circuit to calculate the distance and position of an object.
The parking assist can be activated/deactivated by pressing the parking assist switch. By engaging the reverse gear the parking assist can also be activated. By subsequently pressing the parking assist switch the parking assist can be disabled again.
The indicator in the parking assist switch shows the status of the parking assist. If the lamp is ON, the parking assist is activated.
When the ignition is turned ON, the advanced rear parking assist control module and the vehicle direction camera control module receives the vehicle identification number (VIN) from the body control module. The advanced control module will compare the VIN received to the VIN stored in memory.
The object sensors are 3-wire sensors that are used to determine the distance between the vehicle and an object of interest. The parking assist control module supplies 8 V to the object sensors via the object sensor supply voltage circuit and provides ground via the object sensor low reference circuit. The parking assist control module triggers the sensors in a sequential loop. After each sensor transmits, the parking assist control module uses the sensor echo received through the object sensor signal circuit to calculate the distance and position of an object.
The ultrasonic parking assist system is designed to identify and notify the driver of an object in the vehicle's path when moving revers at speeds of less than 8 km/h (5 MPH). The distance and location of the object is determined by four object sensors, located in the rear bumper. The parking assist system will notify the driver using an audible signal through the radio.
When the transmission is placed into REVERSE, a 12 V signal is sent to the rearview camera indicating that camera operation is requested. Ignition voltage and ground are supplied to the rearview camera. The rearview camera sends video information to the radio through a video signal + and a video signal - circuit. A grounded shielding also wraps the video signal circuits to reduce electronic interference which may degrade the video signal and cause a distorted or otherwise degraded image.
Two Side Object Sensor Modules are located on each side of the vehicle near the corners of the rear fascia. The modules are provided with B+ and ground. The Side Object Sensor Module - Right has an additional ground to distinguish it from the Side Object Sensor Module - Left. The Side Object Sensor Module - Left is connected to the serial data line. The serial data line is passed through the module to the Side Object Sensor Module - Right.
When vehicle speed is greater than 10 km/h (6.2 MPH) and either Side Object Sensor Module detects an object in the detection area, the module provides a signal to the appropriate Outside Rearview Mirror to illuminate the amber telltale LED.
Object Detection Description and Operation (with Side Blind Spot Alert (UFT))
The side blind zone alert system shall detect and report "objects of interest" on either side of the vehicle, within a specified "blind spot" zone. The system is designed to alert the driver, with a visual display placed on the side view mirror, to the presence of objects of interest that may not be visible in the inside rearview mirror and outside rear view mirrors. Although this system is intended to help drivers avoid lane change crashes, it does not replace driver vision and therefore should be considered a lane change aid. Even with the side blind zone alert system, the driver must check carefully for objects outside of the reporting zone (e.g., a fast approaching vehicle) before changing lanes. In the event that the system senses a malfunction through its diagnostic routines, the system will be disabled and the driver will be visually notified.
When the system detects a vehicle in the side blind zone while driving forward, an amber warning symbol will light up in the appropriate outside mirror. This indicates that it may be unsafe to change lanes. If the driver then activates the turn signal, the amber warning symbol starts flashing as an extra warning not to change lanes.
Side blind zone alert is active when the vehicle is out of park or the parking brake is off on manual transmission vehicles and from speeds of 10 km/h (6.2 MPH) up to 140 km/h (87 MPH). Driving faster deactivates the system, indicated by dimly lighting the warning symbols in the mirrors. Driving under this speed again will turn off the warning symbols. If then a vehicle is detected in the blind zone, the warning symbols will lit normal on the appropriate side. When the vehicle is started, both outside mirror displays will briefly come on to indicate that the system is operating.
Side Blind Zone Alert Operation
When the vehicle is started, both outside mirror displays will briefly come on to indicate that the system is operating. The system is designed to detect objects of interest as small as a 125cc motorcycle with rider. The detection zone starts at the outside rearview mirror and extends out to 3.5 m (11 ft) at the back corner of the vehicle and 3 m (10 ft) behind the vehicle at a height of 0.5 m (1.5 ft) to 2.0 m (6 ft) above the ground. The side blind zone system does not detect stationary objects such as guardrails, posts, curbs, walls, berms, bridges, or parked vehicles.
When the system detects a vehicle in the side blind zone while driving forward, independent if passing a vehicle or being passed, an amber warning symbol will light up in the appropriate outside mirror. This indicates that it may be unsafe to change lanes. If the driver then activates the turn signal, the amber warning symbol starts flashing as an extra warning not to change lanes.
Foul weather may affect the operation of the side blind zone system. Occasional missed alerts can occur under normal circumstances and will increase in wet conditions. The number of missed alerts will increase with increased rainfall or road spray. Heavy rainfall, as well as mud, dirt, snow, ice, or slush build-up on the rear fascia, can completely disable the system.
If the vehicle is towing a trailer or has an object, such as a bicycle rack, attached to the rear of the vehicle, the side blind zone system may not function properly and the indicators may remain illuminated at all time.
Object Detection Description and Operation (with Parking Assist (UD7))
The ultrasonic parking assist system is designed to identify and notify the driver of an object in the vehicles path when reversing at speeds of less than 8 km/h (5 MPH). The distance and location of the object is determined by 4 object sensors located in the rear bumper. The parking assist system will notify the driver using an audible beep signal through the radio rear speakers.
The parking assist system is made up of the following components
- Parking assist control module
- Rear object alarm sensors
Parking Assist Control Module
The parking assist control module provides an 8 V reference and a low reference to the four object alarm sensors. The parking assist control module receives individual signals from each of the four sensors and determines the location and distance of an object based on these inputs. When an object is detected, the parking assist control module will send a data message via CAN-Bus to the radio requesting an audible alert.
Rear Object Alarm Sensors
The object alarm sensors are located in the rear bumper of the vehicle. The sensors are used to determine the distance between an object and the bumper. Each sensor emits an ultrasonic frequency which is reflected off any object located behind the vehicle. These reflections are received by the sensors. The time difference between the emission of the frequency and when the reflection is received is known as sensor echo time, it is used to determine the distance to the object. The sensors report this information to the parking assist control module.
Rear Parking Assist Operation
When the vehicle is first placed into reverse there will be one audible beep through the rear speakers, to indicate that the system is working. If rear speakers are inoperable no audible signals will occur.
When backing up at speed of less than 8 km/h (5 MPH), the system is constantly monitoring for object of interest located behind the vehicle. The rear parking assist system can detect objects greater than 7.6 cm (3 in) wide and 25.4 cm (10 in) tall. The system cannot detect objects below the bumper, underneath the vehicle. If an object is detected within 2.5 m (8 ft) there will be a audible beep notification out of both rear speakers based upon the distance to the object. As the vehicle gets closer to an object, the time between the beeps become shorter.
If the vehicle stops in a range zone the beeping will stop after 5 s. When the distance between the object and the vehicle changes, beeping will start again.
If the rear parking assist system detects a malfunction the single audible beep will not chime when put into reverse along with a DTC being stored. The object alarm module will send a serial data message to the instrument panel cluster to display the SERVICE PARK ASSIST message on the driver information center.
Rear Vision Camera System Operation
The rear vision camera system consists of a video camera/module located at the rear of the vehicle and the infotainment display.
When the transmission is placed into REVERSE, a 12 volt signal is sent to the rear vision camera by the body control module (BCM). This signal indicates to the camera that the vehicle is in reverse and image display is requested. The rear vision camera receives ignition voltage and a constant ground to power the camera. Video signal + and video signal - circuits carry the video image from the rear vision camera to the infotainment display. Additionally, the video signal circuits are shielded to prevent any interference which may lead to a loss of video signal resolution and a degraded video image. The shield is provided a ground path by the rear vision camera.
The following conditions may cause a degraded rear vision camera image
- Ice, snow, or mud has built up on the rear vision camera
- Dark conditions
- Extreme light conditions, such as glare from the sun or the headlights of another vehicle
- Damage to the rear of the vehicle
- Extreme high temperatures or extreme temperature changes
If a malfunction is detected in the system, Service Rear Vision Camera may be displayed on the infotainment display as an indicator to the customer that a problem exists that requires service.
See also:
• COMPONENT CONNECTOR END VIEWS - INDEX