Intuitive Parking Assist System (Dianostic Codes & Circuit Tests): Overview Lexus LX J200

DESCRIPTION

The No. 1 ultrasonic sensor LH is installed on the front bumper. The ECU detects obstacles based on signals received from the No. 1 ultrasonic sensor LH. If the No. 1 ultrasonic sensor LH has an open or other malfunction, it will not function normally.

The No. 1 ultrasonic sensor RH is installed on the front bumper. The ECU detects obstacles based on signals received from the No. 1 ultrasonic sensor RH. If the No. 1 ultrasonic sensor RH has an open circuit or other malfunction, it will not function normally.

The No. 2 ultrasonic sensor LH is installed on the rear bumper. The ECU detects obstacles based on signals received from the No. 2 ultrasonic sensor LH. If the No. 2 ultrasonic sensor LH has an open circuit or other malfunction, it will not function normally.

The No. 3 ultrasonic sensor LH is installed on the rear bumper. The ECU detects obstacles based on signals received from the No. 3 ultrasonic sensor LH. If the No. 3 ultrasonic sensor LH has an open circuit or other malfunction, it will not function normally.

The No. 3 ultrasonic sensor RH is installed on the rear bumper. The ECU detects obstacles based on signals received from the No. 3 ultrasonic sensor RH. If the No. 3 ultrasonic sensor RH has an open circuit or other malfunction, it will not function normally.

The No. 2 ultrasonic sensor RH is installed on the rear bumper. The ECU detects obstacles based on signals received from the No. 2 ultrasonic sensor RH. If the No. 2 ultrasonic sensor RH has an open or other malfunction, it will not function normally.

This DTC is stored when there is an open or short circuit in the communication line between the front sensors and the ECU, or when there is a malfunction in a front sensor.

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1. CHECK FOR DTC Clear the DTCs. Refer to «DTC CHECK / CLEAR»(ref-385277-S13441709982011021400000) . Check for DTCs. Refer to «DTC CHECK / CLEAR»(ref-385277-S13441709982011021400000) . RESULT Result Proceed to DTC C1AEC is output A No DTC is output B B --> See step 10 A: Go to next step
2. CHECK PARKING ASSIST ECU Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition F37-31 (BOF) - Body ground Engine switch on (IG) 7.2 to 8.8 V Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition F37-32 (E1) - Body ground Always Below 1 ohms NG --> See step 11 OK: Go to next step
3. CHECK HARNESS AND CONNECTOR (NO. 1 ULTRASONIC SENSOR LH - PARKING ASSIST ECU) Disconnect the B4 sensor connector. Disconnect the F37 ECU connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition B4-1 (BI) - F37-31 (BOF) Always Below 1 ohms B4-3 (SI) - F37-33 (SOF) Always Below 1 ohms B4-5 (EI) - F37-32 (E1) Always Below 1 ohms B4-1 (BI) - Body ground Always 10 kohms or higher B4-3 (SI) - Body ground Always 10 kohms or higher B4-5 (EI) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
4. CHECK HARNESS AND CONNECTOR (NO. 1 ULTRASONIC SENSOR LH - NO. 1 ULTRASONIC SENSOR RH) Disconnect the B4 and B3 sensor connectors. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition B4-2 (BO) - B3-1 (BI) Always Below 1 ohms B4-4 (SO) - B3-3 (SI) Always Below 1 ohms B4-6 (EO) - B3-5 (EI) Always Below 1 ohms B4-2 (BO) - Body ground Always 10 kohms or higher B4-4 (SO) - Body ground Always 10 kohms or higher B4-6 (EO) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
5. CHECK FOR DTC Clear the DTCs. Refer to «DTC CHECK / CLEAR»(ref-385277-S13441709982011021400000) . Check for DTCs. Refer to «DTC CHECK / CLEAR»(ref-385277-S13441709982011021400000) . RESULT Result Proceed to DTC C1AEC is output and multi-information display indicates open circuit (front left and front right) A No DTC is output B B --> See step 12 A: Go to next step
6. INSPECT NO. 1 ULTRASONIC SENSOR LH Disconnect the B4 sensor connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition B4-1 (BI) - B4-5 (BI) Always 10 kohms or higher B4-1 (BI) - B4-2 (BO) Always 10 kohms or higher B4-3 (SI) - B4-4 (SO) Always Below 1 ohms B4-5 (EI) - B4-6 (EO) Always Below 1 ohms NG --> See step 13 OK: Go to next step
7. CHECK FOR DTC Clear the DTCs. Refer to «DTC CHECK / CLEAR»(ref-385277-S13441709982011021400000) . Check for DTCs. Refer to «DTC CHECK / CLEAR»(ref-385277-S13441709982011021400000) . RESULT Result Proceed to DTC C1AEC is output A No DTC is output B B --> END A: Go to next step
8. REPLACE NO. 1 ULTRASONIC SENSOR RH Replace the No. 1 ultrasonic sensor RH with a normally functioning sensor. Refer to «REMOVAL»(ref-385272-S14145684962011021400000) . NEXT: Go to next step
9. CHECK FOR DTC Clear the DTCs. Refer to «DTC CHECK / CLEAR»(ref-385277-S13441709982011021400000) . Check for DTCs. Refer to «DTC CHECK / CLEAR»(ref-385277-S13441709982011021400000) . RESULT Result Proceed to DTC C1AEC is output A No DTC is output B B --> END A --> See step 14
10. USE SIMULATION METHOD TO CHECK. Refer to «ELECTRONIC CIRCUIT INSPECTION PROCEDURE»(ref-385196-S04310778802011021400000)
11. REPLACE PARKING ASSIST ECU. Refer to «REMOVAL»(ref-385272-S26740711142011021400000)
12. USE SIMULATION METHOD TO CHECK. Refer to «ELECTRONIC CIRCUIT INSPECTION PROCEDURE»(ref-385196-S04310778802011021400000)
13. REPLACE NO. 1 ULTRASONIC SENSOR LH. Refer to «REMOVAL»(ref-385272-S14145684962011021400000)
14. REPLACE PARKING ASSIST ECU. Refer to «REMOVAL»(ref-385272-S26740711142011021400000)

This DTC is stored when there is an open or short circuit in the communication line between the rear sensors and the ECU, or when there is a malfunction in a rear sensor.

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1. CHECK FOR DTC Clear the DTCs. Refer to «DTC CHECK / CLEAR»(ref-385277-S13441709982011021400000) . Check for DTCs. Refer to «DTC CHECK / CLEAR»(ref-385277-S13441709982011021400000) . RESULT Result Proceed to DTC C1AED is output A No DTC is output B B --> See step 16 A: Go to next step
2. CHECK PARKING ASSIST ECU Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition F37-28 (BOR) - Body ground Engine switch on (IG) 7.2 to 8.8 V Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition F37-29 (E2) - Body ground Always Below 1 ohms NG --> See step 17 OK: Go to next step
3. CHECK HARNESS AND CONNECTOR (NO. 2 ULTRASONIC SENSOR RH - PARKING ASSIST ECU) Disconnect the O1 sensor connector. Disconnect the F37 ECU connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition O1-1 (BI) - F37-28 (BOR) Always Below 1 ohms O1-3 (SI) - F37-30 (SOR) Always Below 1 ohms O1-5 (EI) - F37-29 (E2) Always Below 1 ohms O1-1 (BI) - Body ground Always 10 kohms or higher O1-3 (SI) - Body ground Always 10 kohms or higher O1-5 (EI) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
4. CHECK HARNESS AND CONNECTOR (NO. 2 ULTRASONIC SENSOR RH - NO. 3 ULTRASONIC SENSOR RH) Disconnect the O1 and O2 sensor connectors. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition O1-2 (BO) - O2-1 (BI) Always Below 1 ohms O1-4 (SO) - O2-3 (SI) Always Below 1 ohms O1-6 (EO) - O2-5 (EI) Always Below 1 ohms O1-2 (BO) - Body ground Always 10 kohms or higher O1-4 (SO) - Body ground Always 10 kohms or higher O1-6 (EO) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
5. CHECK HARNESS AND CONNECTOR (NO. 3 ULTRASONIC SENSOR RH - NO. 3 ULTRASONIC SENSOR LH) Disconnect the O2 and O3 sensor connectors. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition O2-2 (BO) - O3-1 (BI) Always Below 1 ohms O2-4 (SO) - O3-3 (SI) Always Below 1 ohms O2-6 (EO) - O3-5 (EI) Always Below 1 ohms O2-2 (BO) - Body ground Always 10 kohms or higher O2-4 (SO) - Body ground Always 10 kohms or higher O2-6 (EO) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
6. CHECK HARNESS AND CONNECTOR (NO. 3 ULTRASONIC SENSOR LH - NO. 2 ULTRASONIC SENSOR LH) Disconnect the O3 and O4 sensor connectors. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition O3-2 (BO) - O4-1 (BI) Always Below 1 ohms O3-4 (SO) - O4-3 (SI) Always Below 1 ohms O3-6 (EO) - O4-5 (EI) Always Below 1 ohms O3-2 (BO) - Body ground Always 10 kohms or higher O3-4 (SO) - Body ground Always 10 kohms or higher O3-6 (EO) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
7. CHECK FOR DTC Clear the DTCs. Refer to «DTC CHECK / CLEAR»(ref-385277-S13441709982011021400000) . Check for DTCs. Refer to «DTC CHECK / CLEAR»(ref-385277-S13441709982011021400000) . RESULT Result Proceed to DTC C1AED is output and multi-information display indicates open circuit (rear left, rear center and rear right) A DTC C1AED is output and multi-information display indicates open circuit (rear left and rear center) B No DTCs are output C C --> See step 18 B --> See step 12 A: Go to next step
8. INSPECT NO. 2 ULTRASONIC SENSOR RH Disconnect the O1 sensor connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition O1-1 (BI) - O1-5 (EI) Always 10 kohms or higher O1-1 (BI) - O1-2 (BO) Always 10 kohms or higher O1-3 (SI) - O1-4 (SO) Always Below 1 ohms O1-5 (EI) - O1-6 (EO) Always Below 1 ohms NG --> See step 19 OK: Go to next step
9. CHECK FOR DTC Clear the DTCs. Refer to «DTC CHECK / CLEAR»(ref-385277-S13441709982011021400000) . Check for DTCs. Refer to «DTC CHECK / CLEAR»(ref-385277-S13441709982011021400000) . RESULT Result Proceed to DTC C1AED is output and multi-information display indicates open circuit (rear left, rear center and rear right) A DTC C1AED is output and multi-information display indicates open circuit (rear left and rear center) B No DTC is output C C --> END B --> See step 12 A: Go to next step
10. REPLACE NO. 2 ULTRASONIC SENSOR LH Replace the No. 2 ultrasonic sensor LH with a normally functioning sensor. Refer to «REMOVAL»(ref-385272-S21530046302011021400000) . NEXT: Go to next step
11. CHECK FOR DTC Clear the DTCs. Refer to «DTC CHECK / CLEAR»(ref-385277-S13441709982011021400000) . Check for DTCs. Refer to «DTC CHECK / CLEAR»(ref-385277-S13441709982011021400000) . RESULT Result Proceed to DTC C1AED is output and multi-information display indicates open circuit (rear left and rear center) A DTC C1AED is output and multi-information display indicates open circuit (rear left, rear center and rear right) B No DTC is output C C --> END B --> See step 21 A: Go to next step
12. INSPECT NO. 3 ULTRASONIC SENSOR RH Disconnect the O2 sensor connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition O2-1 (BI) - O2-5 (EI) Always 10 kohms or higher O2-1 (BI) - O2-2 (BO) Always 10 kohms or higher O2-3 (SI) - O2-4 (SO) Always Below 1 ohms O2-5 (EI) - O2-6 (EO) Always Below 1 ohms NG --> See step 22 OK: Go to next step
13. CHECK FOR DTC Clear the DTCs. Refer to «DTC CHECK / CLEAR»(ref-385277-S13441709982011021400000) . Check for DTCs. Refer to «DTC CHECK / CLEAR»(ref-385277-S13441709982011021400000) . RESULT Result Proceed to DTC C1AED is output and multi-information display indicates open circuit (rear left and rear center) A No DTC is output B B --> END A: Go to next step
14. INSPECT NO. 3 ULTRASONIC SENSOR LH Disconnect O3 sensor connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition O3-1 (BI) - O3-5 (EI) Always 10 kohms or higher O3-1 (BI) - O3-2 (BO) Always 10 kohms or higher O3-3 (SI) - O3-4 (SO) Always Below 1 ohms O3-5 (EI) - O3-6 (EO) Always Below 1 ohms NG --> See step 20 OK: Go to next step
15. CHECK FOR DTC Clear the DTCs. Refer to «DTC CHECK / CLEAR»(ref-385277-S13441709982011021400000) . Check for DTCs. Refer to «DTC CHECK / CLEAR»(ref-385277-S13441709982011021400000) . RESULT Result Proceed to DTC C1AED is output and multi-information display indicates open circuit (rear left, rear center and rear right) A No DTC is output B B --> END A --> See step 23
16. USE SIMULATION METHOD TO CHECK. Refer to «ELECTRONIC CIRCUIT INSPECTION PROCEDURE»(ref-385196-S04310778802011021400000)
17. REPLACE PARKING ASSIST ECU. Refer to «REMOVAL»(ref-385272-S26740711142011021400000)
18. USE SIMULATION METHOD TO CHECK. Refer to «ELECTRONIC CIRCUIT INSPECTION PROCEDURE»(ref-385196-S04310778802011021400000)
19. REPLACE NO. 2 ULTRASONIC SENSOR RH. Refer to «REMOVAL»(ref-385272-S21530046302011021400000)
20. REPLACE NO. 3 ULTRASONIC SENSOR LH. Refer to «REMOVAL»(ref-385272-S21530046302011021400000)
21. REPLACE PARKING ASSIST ECU. Refer to «REMOVAL»(ref-385272-S26740711142011021400000)
22. REPLACE NO. 3 ULTRASONIC SENSOR RH. Refer to «REMOVAL»(ref-385272-S21530046302011021400000)
23. REPLACE PARKING ASSIST ECU. Refer to «REMOVAL»(ref-385272-S26740711142011021400000)

When the clearance sonar main switch turns on, the ON signal is input into the parking assist ECU.

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1. READ VALUE USING TECHSTREAM (CLEARANCE SONAR MAIN SWITCH) Check the Data List for proper functioning of the clearance sonar main switch. INTUITIVE P/A Tester Display Measurement Item/Range Normal Condition Diagnostic Note Main Switch Clearance sonar main switch/OFF or ON OFF: Clearance sonar main switch off ON: Clearance sonar main switch on - OK Techstream display changes according to operation of clearance sonar main switch. NG --> See step 3 OK --> See step 2
2. PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to «PROBLEM SYMPTOMS TABLE»(ref-385277-S15159353802011021400000)
3. INSPECT CLEARANCE SONAR MAIN SWITCH Remove the clearance sonar main switch. Refer to «INSPECTION»(ref-385272-S21682278102011021400000) . Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Switch Condition Specified Condition 6 (IG) - 5 (ECU) Clearance sonar main switch on Below 1 ohms 6 (IG) - 5 (ECU) Clearance sonar main switch off 10 kohms or higher NG --> See step 5 OK: Go to next step
4. CHECK HARNESS AND CONNECTOR (MAIN SWITCH - ECU AND BATTERY) Disconnect the E97 switch connector. Disconnect the F37 ECU connector. Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition E97-6 (IG) - Body ground Engine switch on (IG) 11 to 14 V E97-6 (IG) - Body ground Engine switch off Below 1 V Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition E97-5 (ECU) - F37-6 (CSSW) Always Below 1 ohms E97-5 (ECU) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 6
5. REPLACE CLEARANCE SONAR MAIN SWITCH. Refer to «REMOVAL»(ref-385272-S38734202972011021400000)
6. REPLACE PARKING ASSIST ECU. Refer to «REMOVAL»(ref-385272-S26740711142011021400000)

The No. 1 clearance warning buzzer sounds to alert the driver and the buzzed frequency changes depending on the distance to an obstacle.

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1. PERFORM ACTIVE TEST USING TECHSTREAM (NO. 1 CLEARANCE WARNING BUZZER) Select the Active Test, use the Techstream to generate a control command, and then check that the buzzer operates. INTUITIVE P/A Tester Display Test Part Control Range Diagnostic Note Buzzer No. 1 clearance warning buzzer Operate or Stop - OK No. 1 clearance warning buzzer sounds. NG --> See step 2 OK --> See step 4
2. CHECK HARNESS AND CONNECTOR (PARKING ASSIST ECU - NO. 1 CLEARANCE WARNING BUZZER) Disconnect the F37 ECU connector. Disconnect the E10 buzzer connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition F37-25 (BBZ) - E10-1 (Z+) Always Below 1 ohms F37-9 (EF) - E10-2 (Z-) Always Below 1 ohms F37-25 (BBZ) - Body ground Always 10 kohms or higher F37-9 (EF) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 3
3. REPLACE NO. 1 CLEARANCE WARNING BUZZER. Refer to «REMOVAL»(ref-385272-S10883219842011021400000)
4. PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to «PROBLEM SYMPTOMS TABLE»(ref-385277-S15159353802011021400000)