PRE-COLLISION SYSTEM, Diagnostic DTC:C1AAF

DTC Code DTC Name
C1AAF Heater Activation Relay Open

DESCRIPTION

The pre-collision city sensor controls the TSS C HTR relay to turn the pre-collision city heater on and off.

If the pre-collision city sensor detects a malfunction in the TSS C HTR relay coil circuit, it will store DTC C1AAF.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

C1AAF

Heater Activation Relay Open

  • Either of the following is detected:

  • When a pre-collision city heater operation request is output, voltage at terminal BUZ of the pre-collision city sensor is 1.368 V or more for 5 seconds or more.

  • When a pre-collision city heater operation request is not output, voltage at terminal BUZ of the pre-collision city sensor is 0.145 V or less for 5 seconds or more.

  • TSS C HTR relay

  • Pre-collision city sensor

  • Harness or connector
Tip:

Refer to Outline of Pre-collision City Heater in System Description for the pre-collision city heater operation conditions.

Click here

WIRING DIAGRAM

B464289E23

CAUTION / NOTICE / HINT

Note:

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

  • When replacing the pre-collision city sensor, replace it with a new one and be sure to perform initialization. If a pre-collision city sensor which was installed to another vehicle is used, the information stored in the pre-collision city sensor will not match the information from the vehicle and, as a result, a DTC may be stored.

  • If the pre-collision city sensor has been replaced, or the windshield glass has been replaced or removed/installed, be sure to perform Pre-collision City Sensor Optical Axis Learning.

    Tip:

    Pre-collision City Sensor Optical Axis Learning can be performed by using either One Time Recognition or Sequential Recognition.

    One Time Recognition:Click here

    Sequential Recognition:Click here

PROCEDURE

  1. CHECK HARNESS AND CONNECTOR (PRE-COLLISION CITY SENSOR POWER SOURCE CIRCUIT)

    1. C367469C06

      *a

      Front view of wire harness connector

      (to Pre-collision City Sensor)

      Disconnect the M4 pre-collision city sensor connector.

      Note:

      DTCs may be stored when connectors are disconnected during troubleshooting. Therefore, be sure to clear the DTCs using the GTS after troubleshooting has been completed.

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

      Standard Voltage

      Tester Connection

      Condition

      Specified Condition

      M4-8 (BUZ) - Body ground

      Ignition switch ON

      11 to 14 V

      Ignition switch off

      Below 1 V

    3. Connect the M4 pre-collision city sensor connector.

    Result

    Proceed to

    OK

    NG
    NG

    INSPECT TSS C HTR RELAYClick here

    OK

  2. CHECK HARNESS AND CONNECTOR (DIODE (TSS_C_FW) CIRCUIT)

    1. Remove the TSS C HTR relay.

    2. C367469C06

      *a

      Front view of wire harness connector

      (to Pre-collision City Sensor)

      Disconnect the M4 pre-collision city sensor connector.

      Note:

      DTCs may be stored when connectors are disconnected during troubleshooting. Therefore, be sure to clear the DTCs using the GTS after troubleshooting has been completed.

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

      Standard Voltage

      Tester Connection

      Condition

      Specified Condition

      M4-8 (BUZ) - Body ground

      Ignition switch ON

      Below 1 V

    4. Connect the M4 pre-collision city sensor connector.

    5. Install the TSS C HTR relay.

    Result

    Proceed to

    OK

    NG
    OK

    REPLACE PRE-COLLISION CITY SENSOR

    Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (DIODE (TSS_C_FW) CIRCUIT)

  3. INSPECT TSS C HTR RELAY

    1. Remove the TSS C HTR relay.

    2. Inspect the TSS C HTR relay.

      Click here

    Result

    Proceed to

    OK

    NG
    OK

    REPAIR OR REPLACE HARNESS OR CONNECTOR (TSS C HTR RELAY COIL CIRCUIT)

    NG

    REPLACE TSS C HTR RELAY