PARKING ASSIST MONITOR SYSTEM "CHK" message(s) are displayed on the SIGNAL CHECK screen.

DTC Code DTC Name
"CHK" message(s) are displayed on the SIGNAL CHECK screen.

DESCRIPTION

On the SIGNAL CHECK screen, it is possible to check if the signals sent to the parking assist ECU are normal (Click here).

Tip:

  • On the SIGNAL CHECK screen, "OK" (blue) is displayed for items with a normal inspection result or input state.

  • On the SIGNAL CHECK screen, "CHK" (red) is displayed for items with an abnormal inspection result or input state.

  • Displayed items may differ depending on vehicle specifications.

Item

Signal Input Method

Detail

DTC Output when Abnormal Result is Displayed

Signal Receiver

SPEED

CAN communication

Speed signal input

DTC is output

Master cylinder solenoid (Skid control ECU)

CAMERA SW

Vehicle wire harness

Steering pad switch assembly (wide view front and side monitor switch) signal input

DTC is not output

Steering pad switch assembly (wide view front and side monitor switch)

BCTY

CAN communication

Status of CAN communication with main body ECU

DTC is output

Main body ECU (Multiplex network body ECU)

MIRROR SW

CAN communication

Outer rear view mirror retract signal input

DTC is output

Main body ECU (Multiplex network body ECU)

SHIFT

Vehicle wire harness

Shift signal input

DTC is output

Park/neutral position switch assembly

STR SIG

CAN communication

Steering angle sensor signal input

DTC is output

Spiral with sensor cable sub-assembly

HANDLE

CAN communication

Steering position signal input

DTC is output

ECM

BODY

CAN communication

Body size signal

DTC is output

ECM

DEST

CAN communication

Destination information signal input

DTC is output

ECM

BRAND

CAN communication

TOYOTA/LEXUS brand signal

DTC is output

ECM

MTM

-

Multi-terrain monitor signal

DTC is output

Individual setting

WFS SET

Vehicle wire harness

  • Wide view front and side monitor switch signal

  • Front television camera and side television camera feedback signal

DTC is output

  • Steering pad switch assembly (wide view front and side monitor switch)

  • Front passenger side television camera assembly*

  • Front television camera assembly*

T/M

CAN communication

Transmission type signal

DTC is output

ECM

  • *: w/ Parking Assist Monitor System and/or Side Monitor System

WIRING DIAGRAM

E205012E06

CAUTION / NOTICE / HINT

Note:

  • When "System initializing" is displayed on the display and navigation module display after the battery cable is disconnected, correct the steering angle neutral point (Click here).

  • Depending on the parts that are replaced or operations that are performed during vehicle inspection or maintenance, calibration of other systems as well as the parking assist monitor system may be needed (Click here).

PROCEDURE

  1. CHECK DISPLAY CHECK MODE

    1. E198736C01

      Check which items display "CHK" (red) on the SIGNAL CHECK screen.

      Result

      Result

      Proceed to

      "CAMERA SW" displays "CHK" (red)

      A

      "SHIFT" displays "CHK" (red)

      B

      "MTM" or "WFM SET" displays "CHK" (red)*

      C

      "SPEED", "BCTY", "MIRROR SW", "STR SIG", "HANDLE", "BODY", "DEST", "BRAND" or "T/M" displays "CHK" (red)

      D

      *: w/ Side Monitor System

    B

    CHECK PARKING ASSIST ECUClick here

    C

    CHECK PARKING ASSIST MONITOR SYSTEMClick here

    D

    CHECK FOR DTC

    Click here

    Chassis > IPA/Parking Assist Monitor > Trouble Codes

    Body Electrical > Main Body > Trouble Codes

    A

  2. INSPECT STEERING PAD SWITCH ASSEMBLY (WIDE VIEW FRONT AND SIDE MONITOR SWITCH)

    1. Remove the steering pad switch assembly.

      Click here

      E204999C03

      *a

      Wide View Front and Side Monitor Switch

      -

      -

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

      Standard Resistance

      Tester Connection

      Switch Condition

      Specified Condition

      7 (+DP) - 3 (GND1)

      Wide view front and side monitor switch pushed

      Below 2.5 Ω

      7 (+DP) - 3 (GND1)

      Wide view front and side monitor switch not pushed

      1 MΩ or higher

      Result

      Result

      OK

      NG
    NG

    REPLACE STEERING PAD SWITCH ASSEMBLY

    Click here

    OK

  3. INSPECT SPIRAL WITH SENSOR CABLE SUB-ASSEMBLY

    E269661E01

    1. Remove the spiral with sensor cable sub-assembly.

      Click here

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      7 (+DP) - 3 (+DP)

      Spiral cable is turned 2.5 rotations counterclockwise

      Below 1 Ω

      Spiral cable is centered

      Spiral cable is turned 2.5 rotations clockwise

      3 (GND1) - 10 (GND1)

      Spiral cable is turned 2.5 rotations counterclockwise

      Spiral cable is centered

      Spiral cable is turned 2.5 rotations clockwise
      CAUTION:

      The spiral cable is an important part of the SRS airbag system. Incorrect removal or installation of the spiral cable may prevent the airbag from deploying. Be sure to read the Precaution in the SRS section.

      Click here

      Result

      Result

      OK

      NG
    NG

    REPLACE SPIRAL WITH SENSOR CABLE SUB-ASSEMBLY

    Click here

    OK

  4. CHECK HARNESS AND CONNECTOR (SPIRAL WITH SENSOR CABLE - BODY GROUND)

    1. E100093C01

      *a

      Front view of wire harness connector

      (to Spiral with Sensor Cable Sub-assembly)

      Disconnect the G28 spiral with sensor cable sub-assembly connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      G28-10 (GND1) - Body ground

      Always

      Below 1 Ω

      Result

      Result

      OK

      NG
    NG

    CHECK HARNESS AND CONNECTOR (SPIRAL WITH SENSOR CABLE - DRIVING SUPPORT SWITCH CONTROL ECU)Click here

    OK

  5. CHECK HARNESS AND CONNECTOR (SPIRAL WITH SENSOR CABLE - PARKING ASSIST ECU)

    1. Disconnect the G28 spiral with sensor cable sub-assembly connector.

    2. Disconnect the I3 parking assist ECU connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      G28-3 (+DP) - I3-23 (BLSW)

      Always

      Below 1 Ω

      Result

      Result

      OK

      NG
    OK

    REPLACE PARKING ASSIST ECU

    Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  6. CHECK PARKING ASSIST ECU

    1. E185668C06

      *a

      Front view of wire harness connector

      (to Parking Assist ECU)

      Disconnect the I3 parking assist ECU connector.

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

      Standard Voltage

      Tester Connection

      Switch Condition

      Specified Condition

      I3-15 (REV) - Body ground

      Engine switch on (IG), shift lever in R

      11 to 14 V

      I3-15 (REV) - Body ground

      Engine switch on (IG), shift lever in any position except R

      Below 1 V

      Result

      Result

      OK

      NG
    OK

    REPLACE PARKING ASSIST ECU

    Click here

    NG

    CHECK HARNESS AND CONNECTOR (PARKING ASSIST ECU - PARK/NEUTRAL POSITION SWITCH)Click here

  7. CHECK HARNESS AND CONNECTOR (SPIRAL WITH SENSOR CABLE - DRIVING SUPPORT SWITCH CONTROL ECU)

    1. Disconnect the G28 spiral with sensor cable sub-assembly connector.

    2. Disconnect the G60 driving support switch control ECU connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      G28-10 (GND1) - G60-4 (SWI2)

      Always

      Below 1 Ω

      Result

      Result

      OK

      NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  8. REPLACE DRIVING SUPPORT SWITCH CONTROL ECU

    1. Replace the driving support switch control ECU with a new or normally functioning one.

      Click here

    2. Check that "CAMERA SW" displays "OK" on the SIGNAL CHECK screen.

    Result

    Result

    OK

    NG
    OK

    END (DRIVING SUPPORT SWITCH CONTROL ECU IS DEFECTIVE)

    NG

    REPLACE DRIVING SUPPORT SWITCH CONTROL ECU

    Click here

  9. CHECK HARNESS AND CONNECTOR (PARKING ASSIST ECU - PARK/NEUTRAL POSITION SWITCH)

    1. Disconnect the I3 parking assist ECU connector.

    2. Disconnect the C33 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

      I3-15 (REV) - C33-1 (RL)

      Always

      Below 1 Ω

      I3-15 (REV) - Body ground

      Always

      10 kΩ or higher

      Result

      Result

      OK

      NG
    OK

    REPLACE PARK/NEUTRAL POSITION SWITCH ASSEMBLY

    Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  10. CHECK PARKING ASSIST MONITOR SYSTEM

    1. Check if the side monitor system or wide view front monitor system has the problem.

      Result

      Result

      Proceed to

      Side monitor system has problem

      A

      Wide view front monitor system has problem

      B
    A

    GO TO SIDE MONITOR SYSTEM

    Click here

    B

    GO TO WIDE VIEW FRONT MONITOR SYSTEM

    Click here