TOYOTA PARKING ASSIST-SENSOR SYSTEM Back-up Light Circuit

DESCRIPTION

This circuit sends the back-up light switch assembly signals to the clearance warning ECU.

WIRING DIAGRAM

A01ITPOE09
A01ITPOE10

INSPECTION PROCEDURE

Note

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

PROCEDURE


  1. INSPECT BACK-UP LIGHT SWITCH ASSEMBLY

    A01INLYE02

    1. Remove the back-up light switch assembly.


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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      1 (RL) - 2 (RB) Pushed Below 1 Ω
      1 (RL) - 2 (RB) Released 10 kΩ or higher
      Result
      Result Proceed to
      OK (except 1WW Engine) A
      OK (for 1WW Engine) B
      NG C


    B

    CHECK HARNESS AND CONNECTOR (BACK-UP LIGHT SWITCH - BATTERY) Click here

    C

    REPLACE BACK-UP LIGHT SWITCH ASSEMBLY*

    A

  2. CHECK HARNESS AND CONNECTOR (BACK-UP LIGHT SWITCH - BATTERY)


    1. A01IMXYE05
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Back-up Light Switch Assembly)

      Disconnect the C7 back-up light switch assembly connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      C7-2 (RB) - Body ground Ignition switch ON 11 to 14 V
      C7-2 (RB) - Body ground Ignition switch off Below 1 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. Disconnect the H95 clearance warning ECU connector.

    2. Disconnect the C7 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
      H95-23 (RL) - C7-1 (RL) Always Below 1 Ω
      H95-23 (RL) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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

  4. CHECK HARNESS AND CONNECTOR (BACK-UP LIGHT SWITCH - BATTERY)


    1. A01IMXYE08
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Back-up Light Switch Assembly)

      Disconnect the D4 back-up light switch assembly connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      D4-2 (RB) - Body ground Ignition switch ON 11 to 14 V
      D4-2 (RB) - Body ground Ignition switch off Below 1 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. Disconnect the H95 clearance warning ECU connector.

    2. Disconnect the D4 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
      H95-23 (RL) - D4-1 (RL) Always Below 1 Ω
      H95-23 (RL) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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