CRUISE CONTROL SYSTEM(for 1ND-TV with Driving support ECU), Diagnostic DTC:C1A05

DTC Code DTC Name
C1A05 Stop Light Switch Circuit

DESCRIPTION

When the brake pedal is depressed, the stop light switch assembly sends a brake pedal operation signal to the driving support ECU assembly. After reception of this signal, the driving support ECU assembly cancels the cruise control system. When the driving support ECU assembly detects a problem in the stop light switch assembly circuit, DTC C1A05 is stored.

DTC No. Detection Item DTC Detection Condition Trouble Area
C1A05 Stop Light Switch Circuit When the ignition switch is ON and the cruise control switch is on, the driving support ECU assembly detects a malfunction in the signal from the stop light switch assembly circuit.

  • Stop light switch assembly

  • Harness or connector

  • Driving support ECU assembly

WIRING DIAGRAM

A01TAYSE22
*a from IGN Fuse
*b from STOP Fuse
*c Stop Light Switch Assembly
*d Driving Support ECU Assembly

CAUTION / NOTICE / HINT

Note

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

PROCEDURE


  1. INSPECT STOP LIGHT SWITCH ASSEMBLY (POWER SOURCE)


    1. A01TBW2C05
      *a

      Front view of wire harness connector

      (to Stop Light Switch Assembly)

      Disconnect the A1 stop light switch assembly connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A1-2 - Body ground Always 11 to 14 V

    3. Reconnect the A1 stop light switch assembly connector.

      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. INSPECT STOP LIGHT SWITCH ASSEMBLY (POWER SOURCE)


    1. A01TBW2C05
      *a

      Front view of wire harness connector

      (to Stop Light Switch Assembly)

      Disconnect the A1 stop light switch assembly connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A1-4 - Body ground Ignition switch ON 11 to 14 V

    3. Reconnect the A1 stop light switch assembly connector.

      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. INSPECT STOP LIGHT SWITCH ASSEMBLY


    1. Inspect the stop light switch assembly.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE STOP LIGHT SWITCH ASSEMBLY Click here

    OK

  4. CHECK HARNESS AND CONNECTOR (DRIVING SUPPORT ECU ASSEMBLY - STOP LIGHT SWITCH ASSEMBLY)


    1. Disconnect the E128 driving support ECU assembly connector.

    2. Disconnect the A1 stop light switch assembly connector.

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

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      E128-27 (STP-) - A1-1 Always Below 1 Ω
      E128-28 (ST1-) - A1-3 Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      E128-27 (STP-) or A1-1 - Body ground Always 10 kΩ or higher
      E128-28 (ST1-) or A1-3 - Body ground Always 10 kΩ or higher

    4. Reconnect the A1 stop light switch assembly connector.

    5. Reconnect the E128 driving support ECU assembly connector.

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE DRIVING SUPPORT ECU ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (DRIVING SUPPORT ECU ASSEMBLY - STOP LIGHT SWITCH ASSEMBLY)