Intuitive Parking Assist System (Diagnostic Codes & Circuit Tests): Overview Lexus HS I

DESCRIPTION

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

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

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

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

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

The No. 1 ultrasonic sensor (rear right sensor) is installed on the rear bumper. The ECU detects obstacles based on signals received from the No. 1 ultrasonic sensor (rear right sensor). If the No. 1 ultrasonic sensor (rear right sensor) has an open circuit 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.

Scheme 103

Scheme 104

1. CHECK DTC OUTPUT (C1AEC) Check for DTCs. Refer to «DTC CHECK / CLEAR»(ref-398315-S06752409382011051600000) . Clear the DTCs. Refer to «DTC CHECK / CLEAR»(ref-398315-S06752409382011051600000) . Recheck for DTCs. Refer to «DTC CHECK / CLEAR»(ref-398315-S06752409382011051600000) . Result Result Proceed to DTC C1AEC is output A No DTC is output B B --> See step 9 A: Go to next step
2. CHECK HARNESS AND CONNECTOR (CLEARANCE WARNING ECU ASSEMBLY - FRONT LEFT SENSOR) Disconnect the A31 connector from the clearance warning ECU assembly. Disconnect the B5 connector from the No. 1 ultrasonic sensor. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition A31-9 (BOF) - B5-1 (BI) Always Below 1 ohms A31-8 (SOF) - B5-3 (SI) A31-24 (E1) - B5-5 (EI) A31-9 (BOF) - Body ground 10 kohms or higher A31-8 (SOF) - Body ground A31-24 (E1) - Body ground NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
3. CHECK HARNESS AND CONNECTOR (FRONT LEFT SENSOR - FRONT RIGHT SENSOR) Disconnect the B5 and B4 connectors from the No. 1 ultrasonic sensors. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition B5-2 (BO) - B4-1 (BI) Always Below 1 ohms B5-4 (SO) - B4-3 (SI) B5-6 (EO) - B4-5 (EI) B5-2 (BO) - Body ground 10 kohms or higher B5-4 (SO) - Body ground B5-6 (EO) - Body ground NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
4. CHECK NO. 1 ULTRASONIC SENSOR (FRONT LEFT SENSOR) Remove the No. 1 ultrasonic sensor (front left sensor). Refer to «REMOVAL»(ref-398311-S31933345342011051600000) . Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition 1 (BI) - 5 (EI) Always 10 kohms or higher 1 (BI) - 2 (BO) Always 10 kohms or higher 3 (SI) - 4 (SO) Always Below 1 ohms 5 (EI) - 6 (EO) Always Below 1 ohms TEXT IN ILLUSTRATION *1 Component without harness connected (No. 1 Ultrasonic Sensor (Front Left Sensor)) NG --> See step 10 OK: Go to next step
5. REPLACE NO. 1 ULTRASONIC SENSOR (FRONT LEFT SENSOR) See step 2 NEXT: Go to next step
6. CHECK DTC OUTPUT (C1AEC) Clear the DTCs. Refer to «DTC CHECK / CLEAR»(ref-398315-S06752409382011051600000) . Check for DTCs. Refer to «DTC CHECK / CLEAR»(ref-398315-S06752409382011051600000) . Result Result Proceed to DTC C1AEC is output A No DTC is output B B --> END (FRONT LEFT SENSOR WAS DEFECTIVE) A: Go to next step
7. REPLACE NO. 1 ULTRASONIC SENSOR (FRONT RIGHT SENSOR) See step 2 NEXT: Go to next step
8. CHECK DTC OUTPUT (C1AEC) Clear the DTCs. Refer to «DTC CHECK / CLEAR»(ref-398315-S06752409382011051600000) . Check for DTCs. Refer to «DTC CHECK / CLEAR»(ref-398315-S06752409382011051600000) . Result Result Proceed to DTC C1AEC is output A No DTC is output B B --> END (FRONT RIGHT SENSOR WAS DEFECTIVE) A --> See step 11
9. USE SIMULATION METHOD TO CHECK. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-398089-S18270818032011051600000)
10. REPLACE NO. 1 ULTRASONIC SENSOR (FRONT LEFT SENSOR). Refer to «REMOVAL»(ref-398311-S31933345342011051600000)
11. REPLACE CLEARANCE WARNING ECU ASSEMBLY. Refer to «REMOVAL»(ref-398311-S35006604202011051600000)

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.

Scheme 105

Scheme 106

Scheme 107

Scheme 108

1. CHECK DTC OUTPUT (C1AED) Check for DTCs. Refer to «DTC CHECK / CLEAR»(ref-398315-S06752409382011051600000) . Clear the DTCs. Refer to «DTC CHECK / CLEAR»(ref-398315-S06752409382011051600000) . Recheck for DTCs. Refer to «DTC CHECK / CLEAR»(ref-398315-S06752409382011051600000) . Result Result Proceed to DTC C1AED is output A No DTC is output B B --> See step 17 A: Go to next step
2. CHECK HARNESS AND CONNECTOR (CLEARANCE WARNING ECU ASSEMBLY - REAR RIGHT SENSOR) Disconnect the A31 connector from the clearance warning ECU assembly. Disconnect the Q1 connector from the No. 1 ultrasonic sensor. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition A31-7 (BOR) - Q1-1 (BI) Always Below 1 ohms A31-6 (SOR) - Q1-3 (SI) A31-22 (E2) - Q1-5 (EI) A31-7 (BOR) - Body ground 10 kohms or higher A31-6 (SOR) - Body ground A31-22 (E2) - Body ground NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
3. CHECK HARNESS AND CONNECTOR (REAR RIGHT SENSOR - REAR RIGHT CENTER SENSOR) Disconnect the Q1 and Q3 connectors from the No. 1 ultrasonic sensors. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition Q1-2 (BO) - Q3-1 (BI) Always Below 1 ohms Q1-4 (SO) - Q3-3 (SI) Q1-6 (EO) - Q3-5 (EI) Q1-2 (BO) - Body ground 10 kohms or higher Q1-4 (SO) - Body ground Q1-6 (EO) - Body ground NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
4. CHECK HARNESS AND CONNECTOR (REAR RIGHT CENTER SENSOR - REAR LEFT CENTER SENSOR) Disconnect the Q3 and Q4 connectors from the No. 1 ultrasonic sensors. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition Q3-2 (BO) - Q4-1 (BI) Always Below 1 ohms Q3-4 (SO) - Q4-3 (SI) Q3-6 (EO) - Q4-5 (EI) Q3-2 (BO) - Body ground 10 kohms or higher Q3-4 (SO) - Body ground Q3-6 (EO) - Body ground NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
5. CHECK HARNESS AND CONNECTOR (REAR LEFT CENTER SENSOR - REAR LEFT SENSOR) Disconnect the Q4 and Q2 connectors from the No. 1 ultrasonic sensors. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition Q4-2 (BO) - Q2-1 (BI) Always Below 1 ohms Q4-4 (SO) - Q2-3 (SI) Q4-6 (EO) - Q2-5 (EI) Q4-2 (BO) - Body ground 10 kohms or higher Q4-4 (SO) - Body ground Q4-6 (EO) - Body ground NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
6. CHECK NO. 1 ULTRASONIC SENSOR (REAR RIGHT SENSOR) Remove the No. 1 ultrasonic sensor (rear right sensor). Refer to «REMOVAL»(ref-398311-S36162931232011051600000) . Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition 1 (BI) - 5 (EI) Always 10 kohms or higher 1 (BI) - 2 (BO) Always 10 kohms or higher 3 (SI) - 4 (SO) Always Below 1 ohms 5 (EI) - 6 (EO) Always Below 1 ohms TEXT IN ILLUSTRATION *1 Component without harness connected (No. 1 Ultrasonic Sensor (Rear Right Sensor)) NG --> See step 18 OK: Go to next step
7. CHECK NO. 1 ULTRASONIC SENSOR (REAR RIGHT CENTER SENSOR) Remove the No. 1 ultrasonic sensor (rear right center sensor). Refer to «REMOVAL»(ref-398311-S36162931232011051600000) . Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition 1 (BI) - 5 (EI) Always 10 kohms or higher 1 (BI) - 2 (BO) Always 10 kohms or higher 3 (SI) - 4 (SO) Always Below 1 ohms 5 (EI) - 6 (EO) Always Below 1 ohms TEXT IN ILLUSTRATION *1 Component without harness connected (No. 1 Ultrasonic Sensor (Rear Right Center Sensor)) NG --> See step 19 OK: Go to next step
8. CHECK NO. 1 ULTRASONIC SENSOR (REAR LEFT CENTER SENSOR) Remove the No. 1 ultrasonic sensor (rear left center sensor). Refer to «REMOVAL»(ref-398311-S36162931232011051600000) . Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition 1 (BI) - 5 (EI) Always 10 kohms or higher 1 (BI) - 2 (BO) Always 10 kohms or higher 3 (SI) - 4 (SO) Always Below 1 ohms 5 (EI) - 6 (EO) Always Below 1 ohms TEXT IN ILLUSTRATION *1 Component without harness connected (No. 1 Ultrasonic Sensor (Rear Left Center Sensor)) NG --> See step 20 OK: Go to next step
9. REPLACE NO. 1 ULTRASONIC SENSOR (REAR RIGHT SENSOR) See step 2 NEXT: Go to next step
10. CHECK DTC OUTPUT (C1AED) Clear the DTCs. Refer to «DTC CHECK / CLEAR»(ref-398315-S06752409382011051600000) . Check for DTCs. Refer to «DTC CHECK / CLEAR»(ref-398315-S06752409382011051600000) . Result Result Proceed to DTC C1AED is output A No DTC is output B B --> END (REAR RIGHT SENSOR WAS DEFECTIVE) A: Go to next step
11. REPLACE NO. 1 ULTRASONIC SENSOR (REAR RIGHT CENTER SENSOR) See step 2 NEXT: Go to next step
12. CHECK DTC OUTPUT (C1AED) Clear the DTCs. Refer to «DTC CHECK / CLEAR»(ref-398315-S06752409382011051600000) . Check for DTCs. Refer to «DTC CHECK / CLEAR»(ref-398315-S06752409382011051600000) . Result Result Proceed to DTC C1AED is output A No DTC is output B B --> END (REAR RIGHT CENTER SENSOR WAS DEFECTIVE) A: Go to next step
13. REPLACE NO. 1 ULTRASONIC SENSOR (REAR LEFT CENTER SENSOR) See step 2 NEXT: Go to next step
14. CHECK DTC OUTPUT (C1AED) Clear the DTCs. Refer to «DTC CHECK / CLEAR»(ref-398315-S06752409382011051600000) . Check for DTCs. Refer to «DTC CHECK / CLEAR»(ref-398315-S06752409382011051600000) . Result Result Proceed to DTC C1AED is output A No DTC is output B B --> END (REAR LEFT CENTER SENSOR WAS DEFECTIVE) A: Go to next step
15. REPLACE NO. 1 ULTRASONIC SENSOR (REAR LEFT SENSOR) See step 2 NEXT: Go to next step
16. CHECK DTC OUTPUT (C1AED) Clear the DTCs. Refer to «DTC CHECK / CLEAR»(ref-398315-S06752409382011051600000) . Check for DTCs. Refer to «DTC CHECK / CLEAR»(ref-398315-S06752409382011051600000) . Result Result Proceed to DTC C1AED is output A No DTC is output B B --> END (REAR LEFT SENSOR WAS DEFECTIVE) A --> See step 21
17. USE SIMULATION METHOD TO CHECK. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-398089-S18270818032011051600000)
18. REPLACE NO. 1 ULTRASONIC SENSOR (REAR RIGHT SENSOR). Refer to «REMOVAL»(ref-398311-S36162931232011051600000)
19. REPLACE NO. 1 ULTRASONIC SENSOR (REAR RIGHT CENTER SENSOR). Refer to «REMOVAL»(ref-398311-S36162931232011051600000)
20. REPLACE NO. 1 ULTRASONIC SENSOR (REAR LEFT CENTER SENSOR). Refer to «REMOVAL»(ref-398311-S36162931232011051600000)
21. REPLACE CLEARANCE WARNING ECU ASSEMBLY. Refer to «REMOVAL»(ref-398311-S35006604202011051600000)

These DTCs are stored when the clearance warning ECU assembly cannot receive and recognize several signals via the CAN communication system.

HINT

When 2 or more DTCs starting with "U" are output simultaneously, inspect the connectors and wire harness of each ECU.

This circuit consists of a power source, the clearance warning buzzer and clearance warning ECU assembly. An ECU-excited type buzzer is used. The battery voltage supplied through the buzzer is grounded inside the clearance warning ECU using a pulsed digital pattern, producing sound. The ECU operates the buzzer using a sound pattern that changes depending on the distance to the obstacle.

Scheme 109

This circuit provides power to operate the clearance warning ECU assembly.

Scheme 110