PRE-CRASH SAFETY SYSTEM, Diagnostic DTC:C1AAF

DTC Code DTC Name
C1AAF Heater Activation Relay Open

DESCRIPTION

The pre-crash safety city sensor turns the pre-crash safety city heater on and off by operating the TSS C HTR relay (pre-crash safety city heater relay).

When the pre-crash safety city sensor detects a malfunction in the TSS C HTR relay (pre-crash safety city heater relay) coil side circuit, C1AAF is output.

DTC Code DTC Detection Condition Trouble Area
C1AAF

Either of the following conditions is met:


  • When the pre-crash safety city heater receives an operation request, the BUZ terminal voltage of the pre-crash safety city sensor is continuously 1.368 V or higher for 5 seconds or more

  • When the pre-crash safety city heater receives a non-operation request, the BUZ terminal voltage of the pre-crash safety city sensor is continuously 0.145 V or higher for 5 seconds or more

  • TSS C HTR relay (pre-crash safety city heater relay)

  • Harness or connector

  • Pre-crash safety city sensor

WIRING DIAGRAM

A004833E17

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. If an ECU 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 output.

  • 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.

  • Perform adjustment using "ONE TIME RECOGNITION" or "SEQUENTIAL RECOGNITION".


PROCEDURE


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


    1. A004AIQC03
      *a

      Front view of wire harness connector

      (to Pre-crash Safety City Sensor)

      Disconnect the pre-crash safety city sensor connector.

      Note

      DTCs may be output when connectors are disconnected during inspection. Therefore, be sure to clear the DTCs using the GTS once the inspection has been completed.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      L12-8 (BUZ) - Body ground Ignition switch ON 11 to 14 V
      Ignition switch off Below 1 V
      Result
      Proceed to
      OK
      NG

    NG

    INSPECT TSS C HTR RELAY (PRE-CRASH SAFETY CITY HEATER RELAY) Click here

    OK

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


    1. A004AIQC04
      *a

      Front view of wire harness connector

      (to Pre-crash Safety City Sensor)

      Remove the TSS C HTR relay (pre-crash safety city heater relay).

    2. Disconnect the pre-crash safety city sensor connector.

      Note

      DTCs may be output when connectors are disconnected during inspection. Therefore, be sure to clear the DTCs using the GTS once the inspection has been completed.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      L12-8 (BUZ) - Body ground Ignition switch ON Below 1 V
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE PRE-CRASH SAFETY CITY SENSOR

    NG

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

  3. INSPECT TSS C HTR RELAY (PRE-CRASH SAFETY CITY HEATER RELAY)


    1. Remove the TSS C HTR relay (pre-crash safety city heater relay).

    2. Inspect the TSS C HTR relay (pre-crash safety city heater relay).

      Click here

      Result
      Proceed to
      OK
      NG

    OK

    REPAIR OR REPLACE HARNESS OR CONNECTOR (TSS C HTR RELAY (PRE-CRASH SAFETY CITY HEATER RELAY) COIL CIRCUIT)

    NG

    REPLACE TSS C HTR RELAY (PRE-CRASH SAFETY CITY HEATER RELAY)