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LEXUS PARKING ASSIST-SENSOR SYSTEM > Clearance Sonar Main Switch Circuit

for Preparation Click here


DESCRIPTION

The back sonar or clearance sonar switch assembly is installed at the base of the driver side instrument panel.
When the back sonar or clearance sonar switch assembly is turned on, an ON signal is sent to the clearance warning ECU. The LEXUS parking assist-sensor system operates according to this signal.

WIRING DIAGRAM


E222388E01


INSPECTION PROCEDURE

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

1.READ VALUE USING INTELLIGENT TESTER

  1. Connect the intelligent tester to the DLC3.

  1. Turn the power switch on (IG).

  1. Turn the intelligent tester on.

  1. Enter the following menus: Body / Clearance Sonar / Data List.

  1. According to the display on the intelligent tester, read the Data List.

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



B
REPLACE CLEARANCE WARNING ECU ASSEMBLY (Click here)

C
Go to step 2
A

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE (Click here)  

2.INSPECT BACK SONAR OR CLEARANCE SONAR SWITCH ASSEMBLY

  1. Remove the back sonar or clearance sonar switch assembly (Click here).



    E197324E06

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

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    9 (IG) - 6 (ECU)
    		Clearance sonar main switch is pushed
    		Below 1 Ω
    9 (IG) - 6 (ECU)
    		Clearance sonar main switch is not pushed
    		10 kΩ or higher

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



NG
REPLACE BACK SONAR OR CLEARANCE SONAR SWITCH ASSEMBLY (Click here)
OK


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

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

    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    H39-9 (IG) - Body ground
    		Power switch on (IG)
    		11 to 14 V
    H39-9 (IG) - Body ground
    		Power switch off
    		Below 1 V



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


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

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    A49-1 (CLSW) - H39-6 (ECU)
    		Always
    		Below 1 Ω
    A49-1 (CLSW) - Body ground
    		Always
    		10 kΩ or higher



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE CLEARANCE WARNING ECU ASSEMBLY (Click here)