Intuitive Parking Assist (Diagnostic Codes & Circuit Tests): Overview Lexus IS II facelift

DESCRIPTION

The No. 1 ultrasonic sensor (front left sensor) is installed on the front bumper.

The clearance warning ECU detects obstacles based on signals received from the front left sensor. If the front left sensor's circuit has an open, short or other malfunction, it will not function normally.

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1. INSPECT NO. 1 ULTRASONIC SENSOR Remove the ultrasonic sensor. Measure the resistance of the sensor. Standard resistance Tester Connection Condition Specified Condition S (D2-2) - E (D2-1) Always 600 to 1,200 kohms NOTE: Set the tester to the 100 kohms range before performing the measurement. NG --> REPLACE NO. 1 ULTRASONIC SENSOR (FRONT LEFT SENSOR) OK: Go to next step
2. CHECK WIRE HARNESS (CLEARANCE WARNING ECU - ULTRASONIC SENSOR) Disconnect the Q37 ECU connector. Disconnect the D2 sensor connector. Measure the resistance of the wire harness side connectors. Standard resistance Tester Connection Condition Specified Condition S4 (Q37-6) - S (D2-2) Always Below 1 ohms E4 (Q37-19) - E (D2-1) Always Below 1 ohms S4 (Q37-6) - Body ground Always 10 kohms or higher E4 (Q37-19) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> REPLACE CLEARANCE WARNING ECU

The No. 1 ultrasonic sensor (front right sensor) is installed on the front bumper.

The clearance warning ECU detects obstacles based on signals received from the front right sensor. If the front right sensor's circuit has an open, short or other malfunction, it will not function normally.

Scheme 79

Scheme 80

1. INSPECT NO. 1 ULTRASONIC SENSOR Remove the ultrasonic sensor. Measure the resistance of the sensor. Standard resistance Tester Connection Condition Specified Condition S (D1-2) - E (D1-1) Always 600 to 1,200 kohms NOTE: Set the tester to the 100 kohms range before performing the measurement. NG --> REPLACE NO. 1 ULTRASONIC SENSOR (FRONT RIGHT SENSOR) OK: Go to next step
2. CHECK WIRE HARNESS (CLEARANCE WARNING ECU - ULTRASONIC SENSOR) Disconnect the Q37 ECU connector. Disconnect the D1 sensor connector. Measure the resistance of the wire harness side connectors. Standard resistance Tester Connection Condition Specified Condition S1 (Q37-5) - S (D1-2) Always Below 1 ohms E1 (Q37-18) - E (D1-1) Always Below 1 ohms S1 (Q37-5) - Body ground Always 10 kohms or higher E1 (Q37-18) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> REPLACE CLEARANCE WARNING ECU

The No. 1 ultrasonic sensor (rear left sensor) is installed on the rear bumper.

The clearance warning ECU detects obstacles based on signals received from the rear left sensor. If the rear left sensor's circuit has an open, short or other malfunction, it will not function normally.

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Scheme 82

1. INSPECT NO. 1 ULTRASONIC SENSOR Remove the ultrasonic sensor. Measure the resistance of the sensor. Standard resistance Tester Connection Condition Specified Condition S (S1-2) - E (S1-1) Always 600 to 1,200 kohms NOTE: Set the tester to the 100 kohms range before performing the measurement. NG --> REPLACE NO. 1 ULTRASONIC SENSOR (REAR LEFT SENSOR) OK: Go to next step
2. CHECK WIRE HARNESS (CLEARANCE WARNING ECU - ULTRASONIC SENSOR) Disconnect the Q37 ECU connector. Disconnect the S1 sensor connector. Measure the resistance of the wire harness side connectors. Standard resistance Tester Connection Condition Specified Condition S6 (Q37-4) - S (S1-2) Always Below 1 ohms E6 (Q37-17) - E (S1-1) Always Below 1 ohms S6 (Q37-4) - Body ground Always 10 kohms or higher E6 (Q37-17) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> REPLACE CLEARANCE WARNING ECU

The No. 2 ultrasonic sensor (rear left center sensor) is installed on the rear bumper.

The clearance warning ECU detects obstacles based on signals received from the rear left center sensor. If the rear left center sensor's circuit has an open, short or other malfunction, it will not function normally.

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Scheme 84

1. INSPECT NO. 2 ULTRASONIC SENSOR Remove the ultrasonic sensor. Measure the resistance of the sensor. Standard resistance Tester Connection Condition Specified Condition S (S3-2) - E (S3-1) Always 600 to 1,200 kohms NOTE: Set the tester to the 100 kohms range before performing the measurement. NG --> REPLACE NO. 2 ULTRASONIC SENSOR (REAR LEFT CENTER SENSOR) OK: Go to next step
2. CHECK WIRE HARNESS (CLEARANCE WARNING ECU - ULTRASONIC SENSOR) Disconnect the Q37 ECU connector. Disconnect the S3 sensor connector. Measure the resistance of the wire harness side connectors. Standard resistance Tester Connection Condition Specified Condition S8 (Q37-3) - S (S3-2) Always Below 1 ohms E8 (Q37-16) - E (S3-1) Always Below 1 ohms S8 (Q37-3) - Body ground Always 10 kohms or higher E8 (Q37-16) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> REPLACE CLEARANCE WARNING ECU

The No. 2 ultrasonic sensor (rear right center sensor) is installed on the rear bumper.

The clearance warning ECU detects obstacles based on signals received from the rear right center sensor. If the rear right center sensor's circuit has an open, short or other malfunction, it will not function normally.

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Scheme 86

1. INSPECT NO. 2 ULTRASONIC SENSOR Remove the ultrasonic sensor. Measure the resistance of the sensor. Standard resistance Tester Connection Condition Specified Condition S (S4-2) - E (S4-1) Always 600 to 1,200 kohms NOTE: Set the tester to the 100 kohms range before performing the measurement. NG --> REPLACE NO. 2 ULTRASONIC SENSOR (REAR RIGHT CENTER SENSOR) OK: Go to next step
2. CHECK WIRE HARNESS (CLEARANCE WARNING ECU - NO. 2 ULTRASONIC SENSOR) Disconnect the Q37 ECU connector. Disconnect the S4 sensor connector. Measure the resistance of the wire harness side connectors. Standard resistance Tester Connection Condition Specified Condition S7 (Q37-1) - S (S4-2) Always Below 1 ohms E7 (Q37-14) - E (S4-1) Always Below 1 ohms S7 (Q37-1) - Body ground Always 10 kohms or higher E7 (Q37-14) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> REPLACE CLEARANCE WARNING ECU

The No. 1 ultrasonic sensor (rear right sensor) is installed on the rear bumper.

The clearance warning ECU detects obstacles based on signals received from the rear right sensor. If the rear right sensor's circuit has an open, short or other malfunction, it will not function normally.

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Scheme 88

1. INSPECT NO. 1 ULTRASONIC SENSOR Remove the ultrasonic sensor. Measure the resistance of the sensor. Standard resistance Tester Connection Condition Specified Condition S (S2-2) - E (S2-1) Always 600 to 1,200 kohms NOTE: Set the tester to the 100 kohms range before performing the measurement. NG --> REPLACE NO. 1 ULTRASONIC SENSOR (REAR RIGHT SENSOR) OK: Go to next step
2. CHECK WIRE HARNESS (CLEARANCE WARNING ECU - NO. 1 ULTRASONIC SENSOR) Disconnect the Q37 ECU connector. Disconnect the S2 sensor connector. Measure the resistance of the wire harness side connectors. Standard resistance Tester Connection Condition Specified Condition S5 (Q37-2) - S (S2-2) Always Below 1 ohms E5 (Q37-15) - E (S2-1) Always Below 1 ohms S5 (Q37-2) - Body ground Always 10 kohms or higher E5 (Q37-15) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> REPLACE CLEARANCE WARNING ECU

The clearance sonar main switch is installed on the instrument panel safety pad assembly.

When the clearance sonar main switch in turned ON, an ON signal is sent to the clearance warning ECU through the BEAN line. The intuitive parking assist system operates according to this signal.

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This circuit provides power to operate the clearance warning ECU.

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1. INSPECT FUSE (LH-IG) Remove the LH-IG fuse from the cowl side junction block LH. Measure the resistance of the LH-IG fuse. Standard resistance Below 1 ohms NG --> REPLACE LH-IG FUSE OK: Go to next step
2. INSPECT CLEARANCE WARNING ECU (IG TERMINAL VOLTAGE) Disconnect the Q37 ECU connector. Measure the voltage of the wire harness side connector. Standard voltage Tester Connection Condition Specified Condition IG (Q37-8) - Body ground Engine switch ON (IG) 10 to 14 V NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (CLEARANCE WARNING ECU - BATTERY) OK: Go to next step
3. CHECK WIRE HARNESS (CLEARANCE WARNING ECU - BODY GROUND) Disconnect the Q37 ECU connector. Measure the resistance of the wire harness side connector. Standard resistance Tester Connection Condition Specified Condition E (Q37-27) - Body ground Always Below 1 ohms NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

See also:
• REMOVAL