DYNAMIC RADAR CRUISE CONTROL SYSTEM, Diagnostic DTC:P1575

DTC Code DTC Name
P1575 Warning Buzzer Malfunction

DESCRIPTION

The skid control ECU (brake actuator assembly) receives an alarm demand signal from the driving support ECU assembly and operates the skid control buzzer assembly. The buzzer sounds to warn that the distance between the vehicle in front and this vehicle is decreasing.

DTC No. Detection Item DTC Detection Condition Trouble Area
P1575 Warning Buzzer Malfunction The ECM receives a buzzer abnormal signal for approximately 0.2 seconds or more while the dynamic radar cruise control is operating.

  • Skid control buzzer assembly

  • Skid control buzzer circuit

  • Skid control ECU (brake actuator assembly)

  • Millimeter wave radar sensor assembly

  • Driving support ECU assembly

  • ECM

Tech Tips

If the vehicle ahead in the same lane significantly decreases its speed or another vehicle moves in front of this vehicle, adequate deceleration cannot be applied and the vehicle-to-vehicle distance will shorten. At this time, the system sounds the buzzer and the master warning light blinks to inform the driver. This circuit uses CAN communication. Therefore, if there are any malfunctions in the communication circuit, one or more CAN communication system DTCs are stored.

WIRING DIAGRAM

A018ME2E02

PROCEDURE


  1. PERFORM ACTIVE TEST USING GTS (SKID CONTROL BUZZER ASSEMBLY)


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Body Electrical / Pre-Crash 2 / Active Test

    5. Perform "Active Test" according to the display on the GTS.


      Body Electrical > Pre-Crash 2 > Active Test
      Tester Display Measurement Item Control Range Diagnostic Note
      Radar Cruise Approach Alarm Buzzer Skid control buzzer assembly ON or OFF Buzzer can be heard

      Body Electrical > Pre-Crash 2 > Active Test
      Tester Display
      Radar Cruise Approach Alarm Buzzer
      OK
      Skid control buzzer assembly sounds.
      Result
      Proceed to
      OK
      NG

    6. Turn the engine switch off.


    OK

    GO TO STEP 5 Click here

    NG

  2. INSPECT SKID CONTROL BUZZER ASSEMBLY


    1. Remove the skid control buzzer assembly.

      Click here

    2. Inspect the skid control buzzer assembly.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE SKID CONTROL BUZZER ASSEMBLY Click here

    OK

  3. CHECK TERMINAL VOLTAGE (POWER SOURCE OF SKID CONTROL BUZZER ASSEMBLY)


    1. A018I8KC16
      *a

      Front view of wire harness connector

      (to Skid Control Buzzer Assembly)

      Disconnect the A59 skid control buzzer assembly connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A59-2 (IG1) - Body ground Engine switch on (IG) 11 to 14 V
      A59-2 (IG1) - Body ground Engine switch off Below 1 V

    3. Reconnect the A59 skid control buzzer assembly connector.

      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (SKID CONTROL BUZZER ASSEMBLY - BATTERY)

    OK

  4. CHECK HARNESS AND CONNECTOR (SKID CONTROL BUZZER ASSEMBLY - MILLIMETER WAVE RADAR SENSOR ASSEMBLY)


    1. Disconnect the A59 skid control buzzer assembly connector.

    2. Disconnect the A3 millimeter wave radar sensor assembly connector.

    3. Disconnect the S4 lane departure warning camera connector (w/ Lane Departure Alert System).

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A59-1 (BZ) - A3-10 (BZ) Always Below 1 Ω
      A59-1 (BZ) or A3-10 (BZ) - Body ground Always 10 kΩ or higher

    5. Reconnect the S4 lane departure warning camera connector (w/ Lane Departure Alert System).

    6. Reconnect the A3 millimeter wave radar sensor assembly connector.

    7. Reconnect the A59 skid control buzzer assembly connector.

      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (SKID CONTROL BUZZER ASSEMBLY - MILLIMETER WAVE RADAR SENSOR ASSEMBLY)

    OK

  5. REPLACE MILLIMETER WAVE RADAR SENSOR ASSEMBLY


    1. Replace the millimeter wave radar sensor assembly with a new one.

      Click here

    2. Perform millimeter wave radar sensor assembly adjustment.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  6. CHECK FOR DTCs (RADAR CRUISE)


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Clear the DTCs.

      Click here

    4. Perform the following to make sure that the DTC detection conditions are met.

      Tech Tips

      If the detection conditions are not met, the malfunction cannot be detected.


      1. Drive the vehicle at a speed for which cruise control operation is possible.

      2. Turn the dynamic radar cruise control system on using the cruise control main switch (ON-OFF button).

      3. Push the cruise control main switch to -SET to activate the dynamic radar cruise control system.

    5. Enter the following menus: Powertrain / Radar Cruise / Trouble Codes.

    6. Check for DTCs.


      Powertrain > Radar Cruise > Trouble Codes

      Note

      When replacing the driving support ECU assembly, always replace it with a new one. If a driving support ECU assembly which was installed to another vehicle is used, the information stored in the driving support ECU assembly will not match the information from the vehicle. As a result, a DTC may be stored.

      Result
      Result Proceed to
      DTC P1575 is not output A
      DTC P1575 is output B

    7. Turn the engine switch off.


    A

    END (MILLIMETER WAVE RADAR SENSOR ASSEMBLY WAS DEFECTIVE)

    B

  7. REPLACE DRIVING SUPPORT ECU ASSEMBLY


    1. Replace the driving support ECU assembly with a new one.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  8. CHECK FOR DTCs (RADAR CRUISE)


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Clear the DTCs.

      Click here

    4. Perform the following to make sure that the DTC detection conditions are met.

      Tech Tips

      If the detection conditions are not met, the malfunction cannot be detected.


      1. Drive the vehicle at a speed for which cruise control operation is possible.

      2. Turn the dynamic radar cruise control system on using the cruise control main switch (ON-OFF button).

      3. Push the cruise control main switch to -SET to activate the dynamic radar cruise control system.

    5. Enter the following menus: Powertrain / Radar Cruise / Trouble Codes.

    6. Check for DTCs.


      Powertrain > Radar Cruise > Trouble Codes

      Note

      When replacing the driving support ECU assembly, always replace it with a new one. If a driving support ECU assembly which was installed to another vehicle is used, the information stored in the driving support ECU assembly will not match the information from the vehicle. As a result, a DTC may be stored.

      Result
      Result Proceed to
      DTC P1575 is not output A
      DTC P1575 is output B

    7. Turn the engine switch off.


    A

    END (DRIVING SUPPORT ECU ASSEMBLY WAS DEFECTIVE)

    B

    REPLACE ECM Click here