Intuitive Parking Assist System (Diagnostics - Introduction): Other Lexus CT I

PRECAUTION

1. PRECAUTION FOR DISCONNECTING CABLE FROM NEGATIVE AUXILIARY BATTERY TERMINAL NOTE: When disconnecting the cable from the negative (-) auxiliary battery terminal, initialize the following systems after the cable is reconnected. System Name See Procedure Parking Assist Monitor System Refer to «INITIALIZATION»(ref-568589-S03492911652013072300000) Power Door Lock Control System
2. PRECAUTIONS FOR INTUITIVE PARKING ASSIST SYSTEM Under the following conditions, the detection function may not function properly: A sensor is covered with foreign matter, such as mud or snow (detection function returns to normal when the sensor is cleaned). A sensor is frozen (detection function returns to normal when the temperature of the sensor rises). A hand is blocking a sensor. HINT: In very cold weather where a malfunction display appears, the sensor may not be able to detect obstacles. If the malfunction display appears, visually check the sensor first. If the sensor is free of foreign matter but the malfunction display remains, the sensor may have a malfunction. The detection range may be affected by the following conditions: A sensor is covered with foreign matter, such as mud or snow. The vehicle is in an excessively hot or excessively cold area. Under the following conditions, a detection error may occur: Driving on a bumpy road, an unpaved road or in tall grass. Ultrasonic waves are received from the horn or parking sonar system of another vehicle, a motorcycle engine, or the air brakes of a large vehicle. It is raining heavily or the sensor is splashed with water. The vehicle is tilted at a steep angle. The vehicle is equipped with a fender pole or a wireless antenna mechanism. A sensor is covered with foreign matter, such as mud or snow. The vehicle is moving forward or backward towards high curbs or objects that are perpendicular to the ground. A sensor is sprayed with high pressure water or steam. A towing hitch is mounted on the vehicle. The sensors cannot detect the following objects: Thin objects, such as wires and ropes Materials that absorb ultrasonic waves, such as cotton, snow, etc. Objects with sharp edges Short objects Objects that are tall and protrude toward the vehicle above the detection range of the sensors Other notices: The sensors cannot detect objects directly under the bumper. (A sensor may detect low objects and thin poles, and then lose track of them.) Be aware that the detection range of this system is limited. In certain conditions, some objects may not be detected. As a result, always make sure to check all around the vehicle when driving or parking. The sensors may not be able to detect obstacles that are too close to the sensor. The sensors may not be able to detect obstacles if the sensors have been dropped or subjected to a strong impact.

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COMMUNICATION TABLE

1. *1: w/ Navigation System (for DVD)
2. *2: w/ Navigation System (for HDD)

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1. GENERAL This system uses ultrasonic sensors to detect any obstacles at the corners and the rear of the vehicle. The system then informs the driver of the distance between the sensors and an obstacle as well as their positions by indicating them on the multi-information display (in the combination meter assembly) and multi-display (w/ Navigation System) and by sounding a buzzer.
2. FUNCTION OF COMPONENTS Component Function Ultrasonic Sensor (6) Detects the distance between the vehicle and an obstacle No. 1 Clearance Warning Buzzer Sounds for 1 second to inform the driver when the intuitive parking assist system power is turned on (the power switch is on (IG) and the intuitive parking assist system is on)*1 Sounds to inform the driver according to the distance to an obstacle Multi-information Display on Combination Meter Assembly Displays the location of an obstacle and the approximate distance between the vehicle and the obstacle Displays a malfunction of the ultrasonic sensor to inform the driver Clearance Sonar Indicator on Combination Meter Assembly Illuminates to inform the driver while the intuitive parking assist system power is on (the power switch is on (IG) and the intuitive parking assist system is on) Combination Meter Assembly Transmits the vehicle speed signal to the clearance warning ECU assembly*2 or parking assist ECU*3 Back Sonar or Clearance Sonar Switch Assembly Operating this switch enables, disables or cuts off the operation of the intuitive parking assist system Clearance Warning ECU Assembly Judges the approximate distance between the vehicle and an obstacle based on the signals from the ultrasonic sensors and sends it to the multi-information display and parking assist ECU*3 or navigation computer sub-assembly*4 Sounds the buzzer Parking Assist ECU*3 Receives the display signal and sends it to the multi-display through the digital communication cable Main Body ECU (Multiplex Network Body ECU) Transmits the destination information to the clearance warning ECU assembly Power Management Control ECU Transmits the shift state signal to the clearance warning ECU assembly Display and Navigation Module Display*3 Navigation Computer Sub-assembly*4 Receives the ultrasonic sensor information through CAN communication and sends it to the multi-display through the digital communication cable and the multi-media module wire Transmits the customize information on the multi-display to the clearance warning ECU assembly Multi-display*3 Receives the display signals from the display and navigation module display*3 or navigation computer sub-assembly*4, and displays them on the display panel. *1: The buzzer does not sound when the power switch is on (IG) while the clearance main switch is on. *2: w/o Navigation System *3: w/ Navigation System (for DVD) *4: w/ Navigation System (for HDD)
3. OPERATION EXPLANATION The operating conditions of each ultrasonic sensor differ according to the installation position as shown in the table below. Installation Position Operating Condition Front Corner Sensor Power switch is on (READY). Intuitive parking assist system is on. A shift state other than park (P) has been selected. Vehicle speed is less than approximately 10 km/h (6.2 mph). The sensors stop operating when the vehicle speed exceeds 15 km/h (9.3 mph), and start operating when the vehicle speed drops below 10 km/h (6.2 mph). Rear Corner Sensor Power switch is on (READY). Intuitive parking assist system is on. Reverse (R) has been selected. Rear Center Sensor Power switch is on (READY). Intuitive parking assist system is on. Reverse (R) has been selected. When the system operates, the clearance warning ECU assembly transmits ultrasonic waves from the ultrasonic sensors. If these waves encounter an obstacle within one or more of the sensors ranges, the waves are reflected back to the sensors, which transmit them to the clearance warning ECU assembly. Based on this information, the clearance warning ECU assembly sends signals to the indicator and the clearance warning buzzer. The appropriate distance between the vehicle and the obstacle is then indicated, and the buzzer sounds. HINT: Refer to Detection Range Measurement and Display Inspection. Refer to «OPERATION CHECK»(ref-568594-S16453835032013072300000) .
4. COMMUNICATION SIGNALS OF COMPONENTS HINT: Allocation refers to the process of the clearance warning ECU assembly setting aside IDs for the sensors. The vehicle has the sensors arranged in 2 groups. There is a front series and a rear series. The sensors are connected in a "daisy chain". Initialization mode: An ID is allocated to each sensor and sensor diagnosis is performed. When the initial check is operating (the power switch is on (IG) and the intuitive parking assist system is on), the clearance warning ECU assembly provides power to the first sensors in each series (front left sensor and rear right sensor). HINT: Refer to Self-check Function Inspection (Initial Check). Refer to «OPERATION CHECK»(ref-568594-S16453835032013072300000) . After the power is supplied, the front left sensor and rear right sensor enter standby mode to receive an ID from the ECU. When a certain amount of time has elapsed, the ECU sends an ID allocation signal to these sensors. The front left sensor and rear right sensor receive the ID allocation signal from the ECU and perform self-diagnosis. When the sensor self-diagnosis is completed, the ECU sends an ID allocation confirmation signal to these sensors. After the ID allocation confirmation is performed, the ECU provides power to the second sensors in each series (front right sensor and rear right center sensor) via the first sensors. In the same manner as the first sensors, the second sensors enter standby mode. When a certain amount of time has elapsed, the ECU sends an ID allocation signal to the second sensors. The above operation will be repeated until an ID is allocated to the last sensor, which is in the rear series (rear left sensor). Initialization ends when ID allocation to all ultrasonic sensors is completed. Detection mode: After initialization mode is completed, the system switches into detection mode. In detection mode, the clearance warning ECU assembly sends information request signals and sensor activation signals to the ultrasonic sensors and receives detection result signals from the sensors. The ECU regularly sends ID signals, information request signals, and sensor activation signals to each ultrasonic sensor according to the communication schedule. When a certain amount of time has elapsed (sensor detection operation is completed), the ECU sends an ID signal to the sensor to receive a detection result signal. The ultrasonic sensor sends a detection result signal or detection information signal to the ECU. The above operation is performed repeatedly for each ultrasonic sensor.

CUSTOMIZE PARAMETERS

1. CUSTOMIZE INTUITIVE PARKING ASSIST SYSTEM Customizing with the Techstream Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the intuitive parking assist system on. Turn the Techstream on. Enter the following menus: Body Electrical / Utility / Customize / Sensor Select the setting by referring to the table below. WARNING Display Default Content Setting Relevant ECU Rr Sensor Onset Range Wide Sets the buzzer activation range for the rear center sensors. Narrow or Wide Narrow: 600 mm (1.97 ft.) Wide: 1500 mm (4.92 ft.) Clearance warning ECU assembly Keep Sense Buzzer Avail Sounds the buzzer when the distance between the vehicle and obstacle does not change for more than 3 seconds. Not Avail or Avail Not Avail: Not Available Avail: Available Clearance warning ECU assembly Fr & Rr Buzzer Volume M2 Changes the buzzer volume setting. L, M1, M2, M3 or H L: Low volume M1: Medium low volume M2: Medium volume M3: Medium high volume H: High volume Clearance warning ECU assembly SENSOR Display Default Content Setting Relevant ECU Sensor Condition N Avail Makes the front sensors available when neutral (N) has been selected. Not Avail or Avail Not Avail: Not Available Avail: Available Clearance warning ECU assembly Reverse Range Front Sensor F Changes the operation setting for the front sensors when reverse (R) has been selected. F or F Stop F: Front sensors are available F Stop: Front sensors are not available Clearance warning ECU assembly Non P/R Range Rear Sensor R Stop Changes the operation setting for the rear sensors when a shift state other than park (P) or reverse (R) has been selected. R, Rcrn or R Stop R: All rear sensors are available Rcrn: Rear corner sensors are available R Stop: All rear sensors are not available Clearance warning ECU assembly DISPLAY Display Default Content Setting Relevant ECU Display Mode All The display mode setting (when the intuitive parking assist system is normal). All or Undisp Clearance warning ECU assembly Customizing with Multi-display NOTE: When the customer requests a change in a function, first make sure that the function can be customized. Be sure to make a note of the current settings before customizing. When troubleshooting a function, first make sure that the function is set to the default setting. Turn the power switch on (IG). Turn the intuitive parking assist system on. Enter the following menus: Setup / Vehicle / LEXUS Park Assist. Select the setting by referring to the table below. Display Default Content Setting Relevant ECU Alert volume 3 Sets the buzzer activation range for the rear center sensors. 1, 2, 3, 4 or 5 1: Low volume 2: Medium low volume 3: Medium volume 4: Medium high volume 5: High volume Clearance warning ECU assembly Display On The display mode setting (when the intuitive parking assist system is normal). On or Off Clearance warning ECU assembly Distance Wide Sets the buzzer activation range for the rear center sensors. Narrow or Wide Narrow: 600 mm (1.97 ft.) Wide: 1500 mm (4.92 ft.) Clearance warning ECU assembly