TOYOTA PARKING ASSIST-SENSOR SYSTEM Back-up Light Circuit

DTC Code DTC Name
Back-up Light Circuit

DESCRIPTION

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

WIRING DIAGRAM

E202337E14
E202337E15

CAUTION / NOTICE / HINT

Note:

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

PROCEDURE

  1. INSPECT BACK-UP LIGHT SWITCH ASSEMBLY

    E179072E02

    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
      Table 1. Result

      Result

      Proceed to

      OK (except 1WW Engine)

      A

      OK (for 1WW Engine)

      B

      NG

      C

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

    REPLACE BACK-UP LIGHT SWITCH ASSEMBLY*

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

    1. U123951E01

      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
      Table 2. Text in Illustration

      *a

      Front view of wire harness connector

      (to Back-up Light Switch Assembly)

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  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

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

    (Click here)

    REPAIR OR REPLACE HARNESS OR CONNECTOR

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

    1. U123952E01

      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
      Table 3. Text in Illustration

      *a

      Front view of wire harness connector

      (to Back-up Light Switch Assembly)

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  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

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

    (Click here)

    REPAIR OR REPLACE HARNESS OR CONNECTOR