PRE-CRASH SAFETY SYSTEM, Diagnostic DTC:C1AAF

DTC Code DTC Name
C1AAF Heater Activation Relay Open

DESCRIPTION

  • except 1WW:

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

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

  • for 1WW:

    The pre-crash safety city sensor controls the EDU relay (No. 1 integration relay) to turn the pre-crash safety city heater on and off.

    If the pre-crash safety city sensor detects a malfunction in the EDU relay (No. 1 integration 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-crash safety city heater operation request is output, voltage at terminal BUZ of the pre-crash safety city sensor is 1.368 V or more for 5 seconds or more.

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

  • TSS C HTR relay (except 1WW)

  • EDU relay (No. 1 integration relay) (for 1WW)

  • Pre-crash safety city sensor

  • Harness or connector
Tip:

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

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WIRING DIAGRAM

B464289E01
B464290E01

CAUTION / NOTICE / HINT

Note:

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

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

  • If the pre-crash safety city sensor has been replaced, or the windshield glass has been replaced or removed/installed, be sure to perform Recognition Camera/Target Position Memory and Recognition Camera Axis Adjust.

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PROCEDURE

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

    1. C367469C02

      *a

      Front view of wire harness connector

      (to Pre-crash Safety City Sensor)

      Disconnect the O9 pre-crash safety 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

      O9-8 (BUZ) - Body ground

      Ignition switch ON

      11 to 14 V

      Ignition switch off

      Below 1 V

    Result

    Result

    Proceed to

    OK

    A

    NG (except 1WW)

    B

    NG (for 1WW)

    C
    B

    INSPECT TSS C HTR RELAYClick here

    C

    INSPECT EDU RELAY (NO. 1 INTEGRATION RELAY)Click here

    A

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

    1. except 1WW:

      1. Remove the TSS C HTR relay.

    2. for 1WW:

      1. Remove the EDU relay (No. 1 integration relay).

        Click here

    3. C367469C02

      *a

      Front view of wire harness connector

      (to Pre-crash Safety City Sensor)

      Disconnect the O9 pre-crash safety 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.

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

      Standard Voltage

      Tester Connection

      Condition

      Specified Condition

      O9-8 (BUZ) - Body ground

      Ignition switch ON

      Below 1 V

    Result

    Proceed to

    OK

    NG
    OK

    REPLACE PRE-CRASH SAFETY CITY SENSOR

    Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (DIODE (TSS_S_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

  4. INSPECT EDU RELAY (NO. 1 INTEGRATION RELAY)

    1. Remove the EDU relay (No. 1 integration relay).

      Click here

    2. Inspect the EDU relay (No. 1 integration relay).

      Click here

    Result

    Proceed to

    OK

    NG
    OK

    REPAIR OR REPLACE HARNESS OR CONNECTOR (EDU RELAY (NO. 1 INTEGRATION RELAY) COIL CIRCUIT)

    NG

    REPLACE EDU RELAY (NO. 1 INTEGRATION RELAY)

    Click here