TOYOTA PARKING ASSIST-SENSOR SYSTEM Reverse Signal Circuit

DESCRIPTION

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

*1: for Manual Transmission

*2: for Automatic Transmission

WIRING DIAGRAM

B003MZ6E06

CAUTION / NOTICE / HINT

Note

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

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (CLEARANCE WARNING ECU ASSEMBLY - BATTERY)


    1. B003SEXC01
      *a

      Rear view of wire harness connector

      (to Clearance Warning ECU Assembly)

      Disconnect the clearance warning ECU assembly connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      G88-21 (RL) - Body ground

      • Ignition switch ON

      • Shift lever in R

      		 11 to 14 V
      G88-21 (RL) - Body ground

      • Ignition switch ON

      • Shift lever in any position other than R

      		 Below 1 V
      Result
      Proceed to
      OK
      NG (for Manual Transmission)
      NG (for Automatic Transmission)

    OK

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

    NG (for Automatic Transmission)

    INSPECT PARK/NEUTRAL POSITION SWITCH ASSEMBLY Click here

    NG (for Manual Transmission)

  2. INSPECT BACK-UP LIGHT SWITCH ASSEMBLY


    1. Remove the back-up light switch assembly.

      for RC61F:

      Click here

      for R151:

      Click here

      for RC60/61:

      Click here

    2. Inspect the back-up light switch assembly.

      for RC61F:

      Click here

      for R151:

      Click here

      for RC60/61:

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE BACK-UP LIGHT SWITCH ASSEMBLY for RC61F: REPLACE BACK-UP LIGHT SWITCH ASSEMBLY Click here
    REPLACE BACK-UP LIGHT SWITCH ASSEMBLY for R151: REPLACE BACK-UP LIGHT SWITCH ASSEMBLY Click here
    REPLACE BACK-UP LIGHT SWITCH ASSEMBLY for RC60/61: REPLACE BACK-UP LIGHT SWITCH ASSEMBLY Click here

    OK

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


    1. Disconnect the G88 clearance warning ECU assembly connector.

    2. Disconnect the C11 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
      G88-21 (RL) - C11-1 Always Below 1 Ω
      G88-21 (RL) or C11-1 - Body ground Always 10 kΩ or higher

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      C11-2 - Body ground Ignition switch ON 11 to 14 V
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE CLEARANCE WARNING ECU ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  4. INSPECT PARK/NEUTRAL POSITION SWITCH ASSEMBLY


    1. Remove the park/neutral position switch assembly.

      for AC60F:

      Click here

      for A750F:

      Click here

    2. Inspect the park/neutral position switch assembly.

      for AC60F:

      Click here

      for A750F:

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE PARK/NEUTRAL POSITION SWITCH ASSEMBLY for AC60F: REPLACE PARK/NEUTRAL POSITION SWITCH ASSEMBLY Click here
    REPLACE PARK/NEUTRAL POSITION SWITCH ASSEMBLY for A750F: REPLACE PARK/NEUTRAL POSITION SWITCH ASSEMBLY Click here

    OK

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


    1. Disconnect the G88 clearance warning ECU assembly connector.

    2. Disconnect the C22 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
      G88-21 (RL) - C22-1 (RL) Always Below 1 Ω
      G88-21 (RL) or C22-1 (RL) - Body ground Always 10 kΩ or higher

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      C22-2 (RB) - Body ground Ignition switch ON 11 to 14 V
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE CLEARANCE WARNING ECU ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR