Park Assist/monitoring: Overview Toyota Sienna II рестайлинг

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SYSTEM DESCRIPTION

1. GENERAL To assist the driver with parking the vehicle by displaying an image of the area behind the vehicle, this system has a television camera mounted on the luggage compartment door. The system displays the image on the radio and navigation assembly. This system consists of the following components: Radio and navigation assembly Television camera assembly This system is equipped with a self-diagnosis system, which is operated on a dedicated window that appears on the display panel, just as in the navigation system.
2. FUNCTION OF COMPONENTS The radio and navigation assembly controls the system by using information from the following components: ITEM FUNCTION Item Function Television Camera Assembly Mounted on the luggage compartment door to transmit the rear view of the vehicle to the radio and navigation assembly. A color video camera that uses a CCD (Charge Coupled Device) and a wide-angle lens. Radio and Navigation Assembly Transmits video signals, which contain an image of the area behind the vehicle taken with the television camera assembly. Radio and navigation assembly effects control of the system by receiving the shift position signal from park/neutral position switch. Displays the rear view monitor image on the display panel. Park/Neutral Position Switch Transmits a reverse shift position signal to the radio and navigation assembly.
3. OPERATION EXPLANATION The radio and navigation assembly receives the R position signal from the park / neutral position switch when the shift lever is moved to the R position. After receiving the R position signal, the radio and navigation assembly switches from the navigation system to the rear view monitor system.
4. NOTES FOR REAR VIEW MONITOR Notes for the rear view monitor. The rear view monitor may not function properly if subjected to a severe blow by any hard object. Do not "scrub" the cover part of the camera (resin made). Scrubbing it may scratch the cover and affect the image. Prevent organic solvents, waxes, bond removing solvents, or glass coating from adhering to the cover. Clean it off immediately, and wash with water. Exposing the camera to a sudden temperature change may affect proper functioning of the camera. A clear image may not appear if the camera is dirty with snow, mud, etc. In that case, wash it with water and wipe off the lens. Use a detergent to remove dirt if necessary. Images are difficult to discern even in normal conditions if: Camera screen is frosted over (the image immediately after turning the ignition switch to the on position may be blurred or darker than normal). A strong beam of light, such as a sunbeam or headlight, hits the camera. It is too dark around the camera (at night, etc.). The ambient temperature around the camera is either too high or too low. HINT: When a strong light, such as a sunbeam reflected off the vehicle's body, hits the camera, the image may be blurred. This is called the "SMEAR" phenomenon, peculiar to the CCD camera.

DESCRIPTION

The radio and navigation assembly receives a reverse signal from the park/neutral position switch.

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1. INSPECT RADIO AND NAVIGATION ASSEMBLY Disconnect the radio and navigation assembly connector R12. Measure the voltage according to the value(s) in the table below. Standard voltage TESTER CONNECTION AND SPECIFIED CONDITION Tester connection Condition Specified condition REV - Body ground Ignition switch is ON. Shift lever is moved to R position. 10 to 14 V REV - Body ground Ignition switch is ON. Shift lever is moved to any position except R. Below 1 V OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE NG: Go to Next Step
2. CHECK HARNESS AND CONNECTOR (RADIO AND NAVIGATION ASSEMBLY - PARK/ NEUTRAL POSITION SWITCH) Disconnect the radio and navigation assembly connector R12 and park/neutral position switch connector P1. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION AND SPECIFIED CONDITION Tester connection Condition Specified condition REV-P1-1 Always Below 1 ohms REV - Body ground Always 10 kohms or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to Next Step
3. INSPECT PARK/NEUTRAL POSITION SWITCH ASSEMBLY Disconnect the park/neutral position switch connector P1. Measure the resistance according to the value(s) in the fable below. Standard resistance TESTER CONNECTION AND SPECIFIED CONDITION Tester connection Condition Specified condition P1-1-P1-2 Shift lever is moved to R position. Below 1 ohms P1-1-P1-2 Shift lever is moved to any position except R. 10 kohms or higher NG: REPLACE PARK/NEUTRAL POSITION SWITCH ASSEMBLY OK: REPAIR OR REPLACE HARNESS OR CONNECTOR

This is the display signal circuit of the television camera assembly.

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1. CHECK HARNESS AND CONNECTOR (RADIO AND NAVIGATION ASSEMBLY - TELEVISION CAMERA ASSEMBLY) Disconnect the R10 connector from the radio and navigation assembly. Disconnect the T10 connector from the television camera assembly. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION AND SPECIFIED CONDITION Tester connection (Terminal No.) Condition Specified condition CB+ (T10-4) - CA+ (R10-24) Always Below 1 ohms CGND (T10-3) - CGND (R10-21) Always Below 1 ohms CV+ (T10-2) - V+ (R10-22) Always Below 1 ohms CV- (T10-1) - V- (R10-23) Always Below 1 ohms CB+ (T10-4) - Body ground Always 10 kohms or higher CGND (T10-3) - Body ground Always 10 kohms or higher CV+ (T10-2) - Body ground Always 10 kohms or higher CV- (T10-1) - Body ground Always 10 kohms or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to Next Step
2. INSPECT RADIO AND NAVIGATION ASSEMBLY Reconnect the radio and navigation assembly R10 connector. Measure the voltage according to the value(s) in the table below. Standard voltage TESTER CONNECTION AND SPECIFIED CONDITION Tester connection Condition Specified condition CB+ (T10-4) - CGND (T10-3) Ignition switch ON Shift lever R position Approx. 6 V NG: REPLACE RADIO AND NAVIGATION ASSEMBLY OK: Go to Next Step
3. INSPECT TELEVISION CAMERA ASSEMBLY Reconnect the radio and navigation assembly R10 connector and the television camera assembly T10 connector. Check the waveform of the television camera assembly using an oscilloscope. Measurement terminal: CV+ - CV- Measurement setting: 0.2 V/DIV, 0.2 μs/DIV Condition: Ignition switch ON, Shift lever in R range OK: Pulses as shown in the illustration. NG: REPLACE TELEVISION CAMERA ASSEMBLY OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

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1. REMOVE FRONT DOOR SCUFF PLATE LH
2. REMOVE COWL SIDE TRIM BOARD LH
3. REMOVE INSTRUMENT PANEL FINISH PANEL SUB-ASSEMBLY LOWER LH (See «REMOVAL»(ref-282145-S40783459792008032900000) )
4. REMOVE NO. 1 INSTRUMENT PANEL SAFETY PAD INSERT SUB-ASSEMBLY (See «REMOVAL»(ref-282145-S40783459792008032900000) )
5. REMOVE CLEARANCE WARNING ECU Disconnect each connector. Remove the nut and clearance warning ECU.

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 the obstacles as well as their positions by indicating them on the clearance sonar display and by sounding a buzzer.
2. FUNCTIONS OF COMPONENTS COMPONENTS FUNCTIONS Components Function Ultrasonic Sensor Ultrasonic sensor consists of a sensor portion that transmits and receives ultrasonic waves and a pre-amplifier that amplifies the waves. The ultrasonic sensor outputs the ultrasonic transmission and reception signals to the clearance warning ECU. Clearance Sonar Main Switch Turns the clearance sonar system on and off. Clearance Warning Buzzer Emits an intermittent sound to inform the driver that the ECU has detected an obstacle within prescribed ranges. Clearance Warning ECU Judges the approximate distance between the vehicle and the obstacle based on the signals from the ultrasonic sensors and sends the display signal to the clearance sonar indicator and the buzzer signal to the clearance warning buzzer. Indicators Displays the location of the obstacle and the approximate distance between the vehicle and the obstacle. Speed Sensor Detects speed of each wheel and inputs the data into the clearance warning ECU via the combination meter. Park/ Neutral Position Switch (A/T) Sends a signal that activates the clearance sonar system when the shift lever is moved to the R position.
3. OPERATION EXPLANATION The clearance warning ECU determines whether the clearance sonar system should be operated based on the clearance sonar main switch on/off status, the shift position and the vehicle speed. When the system operates, the clearance warning ECU 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. Based on this information, the clearance warning ECU sends signals to the indicator and the clearance warning buzzer. The approximate distance between the vehicle and the obstacle is then indicated, and the buzzer sounds. HINT: Refer to "OPERATION CHECK" for detailed operation (See «OPERATION CHECK»(ref-282158-S36575989762008032900000) ).

The clearance warning ECU receives the reverse or park position signal from the park / neutral position switch.

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1. INSPECT CLEARANCE WARNING ECU Disconnect the C9 connector from the clearance warning ECU. Measure the voltage according to the value(s) in the table below. Standard voltage TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Condition Specified Condition RL - Body ground Ignition switch ON, shift lever in R position 10 to 14 V PL - Body ground Ignition switch ON, shift lever in P position 10 to 14 V OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE NG: Go to Next Step
2. CHECK HARNESS AND CONNECTOR Disconnect the connector from the park / neutral position switch. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Condition Specified Condition RL - P1-1 Always Below 1 ohms PL - P1-6 Always Below 1 ohms RL - Body ground Always 10 kohms or higher PL - Body ground Always 10 kohms or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to Next Step
3. INSPECT PARK / NEUTRAL POSITION SWITCH Disconnect the park / neutral position switch connector P1. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Condition Specified Condition P1-1 - P1-2 Shift lever is in R position. Below 1 ohms P1-1 - P1-2 Shift lever is in any position except R. 10 kohms or higher P1-2 - P1-6 Shift lever is in P position. Below 1 ohms P1-2 - P1-6 Shift lever is in any position except P. 10 kohms or higher NG: REPLACE PARK / NEUTRAL POSITION SWITCH OK: REPAIR OR REPLACE HARNESS OR CONNECTOR

The clearance warning ECU receives the vehicle speed signal from the combination meter.

HINT

1. A voltage of 12 V or 5 V is output from each ECU and then input to the combination meter. The signal is changed to a pulse signal at the transistor in the combination meter. Each ECU controls the respective system based on the pulse signal.
2. If a short occurs in an ECU, all systems in the diagram below will not operate normally.

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1. CHECK OPERATION OF SPEEDOMETER Drive the vehicle and check if the function of the speedometer in the combination meter is normal. OK: Actual vehicle speed and the speed indicated on the speedometer are the same. HINT: The vehicle speed signal is normal when the indication on the speedometer is normal. NG: CHECK COMBINATION METER OK: Go to Next Step
2. INSPECT CLEARANCE WARNING ECU Disconnect the clearance warning ECU connector C9. Measure the voltage. Jack up either one of the drive wheels. Move the shift lever to the neutral position. Turn the ignition switch to the ON position. Measure the voltage between terminal SPD of the clearance warning ECU and body ground when a drive wheel is turned slowly. OK: Voltage pulses as shown. OK: REPLACE CLEARANCE WARNING ECU NG: Go to Next Step
3. CHECK HARNESS AND CONNECTOR (COMBINATION METER - CLEARANCE WARNING ECU) Disconnect the combination meter C10 connector. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION AND SPECIFIED CONDITION Tester connection Condition Specified condition SPD - C10-36 Ignition switch off Below 1 ohms NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to Next Step
4. CHECK HARNESS AND CONNECTOR (COMBINATION METER AND EACH ECU - BODY GROUND) Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION AND SPECIFIED CONDITION Tester connection Condition Specified condition SPD - Body ground Ignition switch off 10 kohms or higher HINT: If the resistance between terminal SPD and body ground is less than 10 kohms, there may be a short in a wire harness, connector, or ECU. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OR CHECK EACH ECU OK: REPLACE COMBINATION METER

An ultrasonic sensor consists of a sensor portion that transmits and receives ultrasonic waves and a preamplifier that amplifies them. The ultrasonic sensor outputs the ultrasonic waves and sends the received signals to the clearance warning ECU.

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1. INSPECT NO. 2 ULTRASONIC SENSOR Remove the No. 2 ultrasonic sensor. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION AND SPECIFIED CONDITION Tester connection Condition Specified condition 1 - 2 Always 8 to 12 kohms NG: REPLACE NO. 2 ULTRASONIC SENSOR OK: Go to Next Step
2. CHECK HARNESS AND CONNECTOR (CLEARANCE WARNING ECU - NO. 2 ULTRASONIC SENSOR) Disconnect the C9 connector from the clearance warning ECU. Disconnect the U3 connector from the No. 2 ultrasonic sensor. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION AND SPECIFIED CONDITION Tester connection Condition Specified condition S6 - S Always Below 1 ohms E2 - E Always Below 1 ohms S6 - Body ground Always 10 kohms or higher E2 - Body ground Always 10 kohms or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

An ultrasonic sensor consists of a sensor portion that transmits and receives ultrasonic waves and a preamplifier that amplifies them. The ultrasonic sensor outputs the ultrasonic waves and sends the received signals to the clearance warning ECU.

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1. INSPECT NO. 2 ULTRASONIC SENSOR Remove the No. 2 ultrasonic sensor. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION AND SPECIFIED CONDITION Tester connection Condition Specified condition 1 - 2 Always 8 to 12 kohms NG: REPLACE NO. 2 ULTRASONIC SENSOR OK: Go to Next Step
2. CHECK HARNESS AND CONNECTOR (CLEARANCE WARNING ECU - NO. 2 ULTRASONIC SENSOR) Disconnect the C9 connector from the clearance warning ECU. Disconnect the U5 connector from the No. 2 ultrasonic sensor. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION AND SPECIFIED CONDITION Tester connection Condition Specified condition S5 - S Always Below 1 ohms E2 - E Always Below 1 ohms S5 - Body ground Always 10 kohms or higher E2 - Body ground Always 10 kohms or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

An ultrasonic sensor consists of a sensor portion that transmits and receives ultrasonic waves and a preamplifier that amplifies them. The ultrasonic sensor outputs the ultrasonic waves and sends the received signals to the clearance warning ECU.

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1. INSPECT NO. 1 ULTRASONIC SENSOR Remove the No. 1 ultrasonic sensor. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION AND SPECIFIED CONDITION Tester connection Condition Specified condition 1 - 2 Always 8 to 12 kohms NG: REPLACE NO. 1 ULTRASONIC SENSOR OK: Go to Next Step
2. CHECK HARNESS AND CONNECTOR (CLEARANCE WARNING ECU - NO. 1 ULTRASONIC SENSOR) Disconnect the C9 connector from the clearance warning ECU. Disconnect the U1 connector from the No. 1 ultrasonic sensor. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION AND SPECIFIED CONDITION Tester connection Condition Specified condition S4 - S Always Below 1 ohms E1 - E Always Below 1 ohms S4 - Body ground Always 10 kohms or higher E1 - Body ground Always 10 kohms or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

An ultrasonic sensor consists of a sensor portion that transmits and receives ultrasonic waves and a preamplifier that amplifies them. The ultrasonic sensor outputs the ultrasonic waves and sends the reveiced signals to the clearance warning ECU.

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1. INSPECT NO. 1 ULTRASONIC SENSOR Remove the No. 1 ultrasonic sensor. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION AND SPECIFIED CONDITION Tester connection Condition Specified condition 1 - 2 Always 8 to 12 kohms NG: REPLACE NO. 1 ULTRASONIC SENSOR OK: Go to Next Step
2. CHECK HARNESS AND CONNECTOR (CLEARANCE WARNING ECU - NO. 1 ULTRASONIC SENSOR) Disconnect the C9 connector from the clearance warning ECU. Disconnect the U2 connector from the No. 1 ultrasonic sensor. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION AND SPECIFIED CONDITION Tester connection Condition Specified condition S2 - S Always Below 1 ohms E1 - E Always Below 1 ohms S2 - Body ground Always 10 kohms or higher E1 - Body ground Always 10 kohms or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

An ultrasonic sensor consists of a sensor portion that transmits and receives ultrasonic waves and a preamplifier that amplifies them. The ultrasonic sensor outputs the ultrasonic waves and sends the received signals to the clearance warning ECU.

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1. INSPECT NO. 1 ULTRASONIC SENSOR Remove the No. 1 ultrasonic sensor. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION AND SPECIFIED CONDITION Tester connection Condition Specified condition 1 - 2 Always 8 to 12 kohms NG: REPLACE NO. 1 ULTRASONIC SENSOR OK: Go to Next Step
2. CHECK HARNESS AND CONNECTOR (CLEARANCE WARNING ECU - NO. 1 ULTRASONIC SENSOR) Disconnect the C9 connector from the clearance warning ECU. Disconnect the U4 connector from the No. 1 ultrasonic sensor. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION AND SPECIFIED CONDITION Tester connection Condition Specified condition S3 - S Always Below 1 ohms E2 - E Always Below 1 ohms S3 - Body ground Always 10 kohms or higher E2 - Body ground Always 10 kohms or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

An ultrasonic sensor consists of a sensor portion that transmits and receives ultrasonic waves and a preamplifier that amplifies them. The ultrasonic sensor outputs the ultrasonic waves and sends the received signals to the clearance warning ECU.

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1. INSPECT NO. 1 ULTRASONIC SENSOR Remove the No. 1 ultrasonic sensor. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION AND SPECIFIED CONDITION Tester connection Condition Specified condition 1 - 2 Always 8 to 12 kohms NG: REPLACE NO. 1 ULTRASONIC SENSOR OK: Go to Next Step
2. CHECK HARNESS AND CONNECTOR (CLEARANCE WARNING ECU - NO. 1 ULTRASONIC SENSOR) Disconnect the C9 connector from the clearance warning ECU. Disconnect the U6 connector from the No. 1 ultrasonic sensor. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION AND SPECIFIED CONDITION Tester connection Condition Specified condition S1 - S Always Below 1 ohms E2 - E Always Below 1 ohms S1 - Body ground Always 10 kohms or higher E2 - Body ground Always 10 kohms or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

The clearance warning ECU receives the ultrasonic sensor signal to sound the front warning buzzer.

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1. INSPECT FRONT BUZZER Remove the clearance warning ECU with front buzzer. Apply the battery voltage to the terminals 1 and 2 of the buzzer, and check that the buzzer sounds. HINT: The clearance warning buzzer is separately excited, and will not sound unless an alternating voltage is applied. OK: Operating noise (clicking sounds) can be heard. NG: REPLACE FRONT BUZZER OK: Go to Next Step
2. CHECK HARNESS AND CONNECTOR (CLEARANCE WARNING ECU - FRONT BUZZER) Disconnect the clearance warning ECU connector and front buzzer connector. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Condition Specified Condition C8-2 - CBZ Always Below 1 ohms CBZ - Body ground Always 10 kohms or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

This circuit provides power to the clearance warning ECU.

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1. CHECK HARNESS AND CONNECTOR (CLEARANCE WARNING ECU - AIR CONDITIONER AMPLIFIER) Disconnect the connectors from the clearance warning ECU C9 and air conditioner amplifier connector A10 or A11. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Condition Specified Condition +B - SK Always Below 1 ohms +B - Body ground Always 10 kohms or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to Next Step
2. CHECK HARNESS AND CONNECTOR (CLEARANCE WARNING ECU - BODY GROUND) Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Condition Specified Condition E - Body ground Always Below 1 ohms NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to Next Step
3. INSPECT CLEARANCE WARNING ECU Disconnect the clearance warning ECU connector. Turn the ignition switch ON. Turn the clearance sonar main switch ON. Measure the voltage between terminals +B and E of the ECU. Standard voltage: 10 to 14 V Result RESULT REFERENCE Result Proceed to OK A NG B (Auto A/C) NG C (Manual A/C) B: Go to step 4 C: Go to step 5 A: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
4. INSPECT PRINTED WIRE INTEGRATION BOARD SUB-ASSEMBLY Check that the malfunction disappears when a known good printed wire integration board sub-assembly is installed. OK: Malfunction disappears. NG: REPLACE AIR CONDITIONER AMPLIFIER OK: REPLACE PRINTED WIRE INTEGRATION BOARD SUB-ASSEMBLY
5. INSPECT INTEGRATION PANEL SUB-ASSEMBLY Check that the malfunction disappears when a known good integration panel sub-assembly is installed. OK: Malfunction disappears. NG: REPLACE AIR CONDITIONER AMPLIFIER OK: REPLACE INTEGRATION PANEL SUB-ASSEMBLY

The clearance warning ECU receives the ultrasonic sensor signal to sound the rear warning buzzer.

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1. CHECK HARNESS AND CONNECTOR (CLEARANCE WARNING ECU - AIR CONDITIONER AMPLIFIER) Disconnect the connectors from the clearance warning ECU C9 and air conditioner amplifier connector A10 or A11. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Condition Specified Condition BBZ - Z- Always Below 1 ohms BBZ - Body ground Always 10 kohms or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to Next Step
2. INSPECT REAR BUZZER Remove the integration control & panel assembly with the connectors still connected. Using a service wire, ground the terminal Z- of the integration control & panel assembly connector. Turn the ignition switch ON. Check that the rear buzzer sounds. HINT: The clearance warning buzzer is separately excited, and will not sound unless an alternating voltage is applied. OK: Operating noise (clicking sounds) can be heard. Result RESULT REFERENCE Result Proceed to OK A NG B (Auto A/C) NG C (Manual A/C) B: Go to step 3 C: Go to step 4 A: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
3. INSPECT PRINTED WIRE INTEGRATION BOARD SUB-ASSEMBLY Check that the malfunction disappears when a known good printed wire integration board sub-assembly is installed. OK: Malfunction disappears. NG: REPLACE AIR CONDITIONER AMPLIFIER OK: REPLACE PRINTED WIRE INTEGRATION BOARD SUB-ASSEMBLY
4. INSPECT INTEGRATION PANEL SUB-ASSEMBLY Check that the malfunction disappears when a known good integration panel sub-assembly is installed. OK: Malfunction disappears. NG: REPLACE AIR CONDITIONER AMPLIFIER OK: REPLACE INTEGRATION PANEL SUB-ASSEMBLY

The indicator displays the location of the obstacle and the approximate distance between the vehicle and the obstacle either by blinking or turning on.

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1. CHECK HARNESS AND CONNECTOR (CLEARANCE WARNING ECU - AIR CONDITIONER AMPLIFIER) Disconnect the connectors from the clearance warning ECU C9 and air conditioner amplifier connector A10 or A11. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION AND SPECIFIED CONDITION Tester connection Condition Specified condition BK - L5 Always Below 1 ohms RL - L3 Always Below 1 ohms FL - L4 Always Below 1 ohms FR - L2 Always Below 1 ohms RR - L1 Always Below 1 ohms OP - L6 Always Below 1 ohms BK - Body ground Always 10 kohms or higher RL - Body ground Always 10 kohms or higher FL - Body ground Always 10 kohms or higher FR - Body ground Always 10 kohms or higher RR - Body ground Always 10 kohms or higher OP - Body ground Always 10 kohms or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to Next Step
2. INSPECT INDICATOR Remove the integration control & panel assembly with the connectors being connected. Using a service wire, ground each terminal of the integration control & panel assembly connector. Turn the ignition switch ON. Check that each LED comes on. INDICATORS REFERENCE Indicators that come on The terminals to which the service wire connects Power indicator OP Back sonar BK Clearance sonar front RH FR Clearance sonar front LH FL Clearance sonar rear RH RR Clearance sonar rear LH RL Result RESULT REFERENCE Result Proceed to OK A NG B (Auto A/C) NG C (Manual A/C) B: Go to step 3 C: Go to step 4 A: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
3. INSPECT PRINTED WIRE INTEGRATION BOARD SUB-ASSEMBLY OK: Malfunction disappears. NG: REPLACE AIR CONDITIONER AMPLIFIER OK: REPLACE PRINTED WIRE INTEGRATION BOARD SUB-ASSEMBLY
4. INSPECT INTEGRATION PANEL SUB-ASSEMBLY Check that the malfunction disappears when a known good integration panel sub-assembly is installed. OK: Malfunction disappears. NG: REPLACE AIR CONDITIONER AMPLIFIER OK: REPLACE INTEGRATION PANEL SUB-ASSEMBLY