TOYOTA PARKING ASSIST-SENSOR SYSTEM(for 4 Sensor Type) Reverse Signal Circuit

DESCRIPTION

The clearance warning ECU assembly receives a reverse shift position signal from the park/neutral position switch assembly*1 or back-up light switch assembly*2.


WIRING DIAGRAM

A01QR5RE01
except Manual Transaxle
*a IG1 NO.2 Relay
*b GAUGE
*c Park/Neutral Position Switch Assembly
*d Clearance Warning ECU Assembly
A01QR5RE02
for Manual Transaxle
*a IG1 NO.2 Relay
*b GAUGE
*c Back-up Light Switch Assembly
*d Clearance Warning ECU Assembly

PROCEDURE


  1. CHECK CLEARANCE WARNING ECU ASSEMBLY (REVERSE SIGNAL)


    1. Disconnect the G33 clearance warning ECU assembly connector.

    2. A01QTLTC02
      *a

      Front view of wire harness connector

      (to Clearance Warning ECU Assembly)

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      G33-21 (RL) - Body ground

      Ignition switch ON

      Shift lever in R

      		 11 to 14 V
      G33-21 (RL) - Body ground

      Ignition switch ON

      Shift lever in any position except R

      		 Below 1 V
      Result
      Result
      OK
      NG (except Manual Transaxle)
      NG (for Manual Transaxle)

    OK

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

    NG (for Manual Transaxle)

    CHECK HARNESS AND CONNECTOR (CLEARANCE WARNING ECU ASSEMBLY - BACK-UP LIGHT SWITCH ASSEMBLY) Click here

    NG (except Manual Transaxle)

  2. CHECK HARNESS AND CONNECTOR (CLEARANCE WARNING ECU ASSEMBLY - PARK/NEUTRAL POSITION SWITCH ASSEMBLY)


    1. Disconnect the G33 clearance warning ECU assembly connector.

    2. Disconnect the B36 park/neutral position switch assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G33-21 (RL) - B36-2 Always Below 1 Ω
      G33-21 (RL) - Body ground Always 10 kΩ or higher
      Result
      Result Proceed to
      OK (for U660F) A
      OK (for U760E) B
      OK (for U760F) C
      NG D

    A

    REPLACE PARK/NEUTRAL POSITION SWITCH ASSEMBLY Click here

    B

    REPLACE PARK/NEUTRAL POSITION SWITCH ASSEMBLY Click here

    C

    REPLACE PARK/NEUTRAL POSITION SWITCH ASSEMBLY Click here

    D

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  3. CHECK HARNESS AND CONNECTOR (CLEARANCE WARNING ECU ASSEMBLY - BACK-UP LIGHT SWITCH ASSEMBLY)


    1. Disconnect the G33 clearance warning ECU assembly connector.

    2. Disconnect the B35 back-up light switch assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G33-21 (RL) - B35-1 Always Below 1 Ω
      G33-21 (RL) - Body ground Always 10 kΩ or higher
      Result
      Result Proceed to
      OK (for EA64) A
      OK (for EA64F) B
      OK (for EB61) C
      OK (for EB61F) D
      NG E

    A

    REPLACE BACK-UP LIGHT SWITCH ASSEMBLY Click here

    B

    REPLACE BACK-UP LIGHT SWITCH ASSEMBLY Click here

    C

    REPLACE BACK-UP LIGHT SWITCH ASSEMBLY Click here

    D

    REPLACE BACK-UP LIGHT SWITCH ASSEMBLY Click here

    E

    REPAIR OR REPLACE HARNESS OR CONNECTOR