Toyota Venza: Clearance Sonar Main Switch Circuit

Toyota Venza Service Manual / Park Assist / Monitoring / Intuitive Parking Assist System / Clearance Sonar Main Switch Circuit

DESCRIPTION

The back sonar or clearance sonar switch assembly is installed at the base of the driver side of the instrument panel.

When the clearance sonar main switch is turned on, an on signal is sent to the clearance warning ECU assembly. The intuitive parking assist system operates according to this signal.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE

1.	READ VALUE USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(d) Enter the following menus: Body Electrical / Intuitive P/A / Data List.

(e) According to the display on the Techstream, read the Data List.

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	-
Clearance Sonar ECU Type	Type of clearance sonar ECU/Normal	Normal: Normal clearance sonar type	-

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

Clearance Sonar ECU Type

Type of clearance sonar ECU/Normal

Normal: Normal clearance sonar type

Result	Proceed to
Both of the following conditions are met: The display changes as shown above when the clearance sonar main switch is operated. "Normal" is displayed.	A
"Normal" is not displayed.	B
Both of the following conditions are met: The display does not change as shown above when the clearance sonar main switch is operated. "Normal" is displayed.	C

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

REPLACE CLEARANCE WARNING ECU ASSEMBLY

2.	INSPECT BACK SONAR OR CLEARANCE SONAR SWITCH ASSEMBLY

(a) Remove the back sonar or clearance sonar switch assembly (See page ).

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
6 (IG) - 3 (ECU)	Clearance sonar main switch on	Below 1 Ω
6 (IG) - 3 (ECU)	Clearance sonar main switch off	10 kΩ or higher

Text in Illustration

*a	Component without harness connected (Back Sonar or Clearance Sonar Switch Assembly)

REPLACE BACK SONAR OR CLEARANCE SONAR SWITCH ASSEMBLY

3.	CHECK HARNESS AND CONNECTOR (BACK SONAR OR CLEARANCE SONAR SWITCH ASSEMBLY POWER SOURCE)

(a) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection	Condition	Specified Condition
D78-6 (IG) - Body ground	Engine switch on (IG)	11 to 14 V
D78-6 (IG) - Body ground	Engine switch off	Below 1 V

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.	CHECK HARNESS AND CONNECTOR (BACK SONAR OR CLEARANCE SONAR SWITCH ASSEMBLY - CLEARANCE WARNING ECU ASSEMBLY)

(a) Disconnect the D79 clearance warning ECU assembly connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
D79-9 (CLSW) - D78-3 (ECU)	Always	Below 1 Ω
D79-9 (CLSW) - Body ground	Always	10 kΩ or higher

REPLACE CLEARANCE WARNING ECU ASSEMBLY

REPAIR OR REPLACE HARNESS OR CONNECTOR

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