PRE-CRASH SAFETY SYSTEM, Diagnostic DTC:C1AA7

DTC Code DTC Name
C1AA7 Skid Control Buzzer Circuit

DESCRIPTION

When the pre-crash safety city sensor uses pre-crash control to sound a warning, a buzzer signal is output to the skid control buzzer assembly. This DTC is output when the pre-crash safety city sensor detects a malfunction in the skid control buzzer assembly circuit.

DTC Code DTC Detection Condition Trouble Area
C1AA7

If either of the following is met with the ignition switch ON:


  • Skid control buzzer assembly on malfunction continues for 1 second.

  • Skid control buzzer assembly off malfunction continues for 1 second.

  • Skid control buzzer assembly

  • Pre-crash safety city sensor

  • Harness or connector

WIRING DIAGRAM

A004PAIE02

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.

  • When replacing the pre-crash safety city sensor with a new one, or performing removal, installation or replacement of the windshield glass, always perform "Recognition Camera/ Target Position Memory" and "Beam Axis Learning".

    Perform adjustment with either "ONE TIME RECOGNITION" or "SEQUENTIAL RECOGNITION".


PROCEDURE


  1. INSPECT SKID CONTROL BUZZER ASSEMBLY


    1. Remove the skid control buzzer assembly Click here.

    2. Inspect the skid control buzzer assembly Click here.


    NG

    REPLACE SKID CONTROL BUZZER ASSEMBLY Click here

    OK

  2. CHECK HARNESS AND CONNECTOR (SKID CONTROL BUZZER ASSEMBLY - BATTERY)


    1. A004MX4E01
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Skid Control Buzzer Assembly)

      Disconnect the skid control buzzer assembly connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      D9-2 (IG1) - Body ground Ignition switch ON 11 to 14 V
      D9-2 (IG1) - Body ground Ignition switch off Below 1 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK HARNESS AND CONNECTOR (SKID CONTROL BUZZER ASSEMBLY - PRE-CRASH SAFETY CITY SENSOR)


    1. Disconnect the D9 skid control buzzer assembly connector.

    2. Disconnect the K16 pre-crash safety city sensor connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      D9-1 (BZ1) - K16-8 (BUZ) Always Below 1 Ω
      D9-1 (BZ1) - Body ground Always 100 kΩ or higher

    OK

    REPLACE PRE-CRASH SAFETY CITY SENSOR Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR