CRUISE CONTROL SYSTEM(for Diesel), 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 circuit, DTC C1A05 is stored.

DTC Code DTC Detection Condition Trouble Area
C1A05

While cruise control main switch on, driving support ECU assembly detects malfunction* in signal from stop light switch assembly

*: Signal is determined to be malfunctioning when ST1- signal and STP signal do not match

  • Stop light switch assembly

  • Driving support ECU assembly

  • Harness or connector (stop light signal circuit)

WIRING DIAGRAM

A01VJ8SE11
A01VJ5DE09

CAUTION / NOTICE / HINT

Note

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

PROCEDURE


  1. WIRE HARNESS AND CONNECTOR (STOP LIGHT SWITCH POWER SOURCE)


    1. for LED Type Stop Light


      1. Disconnect the stop light switch assembly connector.

      2. A01VGXCE01
        Text in Illustration
        *a

        Front view of wire harness connector

        (to Stop Light Switch Assembly)

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

        Standard Voltage
        Tester Connection Switch Condition Specified Condition
        A101-1 (B) - A101-3 (GND) Always 11 to 14 V
        A101-5 (B) - A101-3 (GND) Ignition switch ON 11 to 14 V

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        A101-3 (GND) - Body ground Always Below 1 Ω

    2. for Bulb Type Stop Light


      1. Disconnect the stop light switch assembly connector.

      2. A01VKJ4E02
        Text in Illustration
        *a

        Front view of wire harness connector

        (to Stop Light Switch Assembly)

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

        Standard Voltage
        Tester Connection Switch Condition Specified Condition
        A89-2 - Body ground Always 11 to 14 V
        A89-4 - Body ground Ignition switch ON 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. INSPECT STOP LIGHT SWITCH ASSEMBLY


    1. for LED Type Stop Light


      1. Reconnect the stop light switch assembly connector.

      2. A01VHWYE02
        Text in Illustration
        *a

        Component with harness connected

        (Stop Light Switch Assembly)

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

        Standard Voltage
        Tester Connection Switch Condition Specified Condition
        A101-2 (L) - A101-3 (GND)

        Ignition switch off,

        Brake pedal not depressed

        		 Below 1 V
        A101-2 (L) - A101-3 (GND)

        Ignition switch off,

        Brake pedal depressed

        		 11 to 14 V
        A101-4 (L) - A101-3 (GND)

        Ignition switch ON,

        Brake pedal not depressed

        		 11 to 14 V
        A101-4 (L) - A101-3 (GND)

        Ignition switch ON,

        Brake pedal depressed

        		 Below 1 V

    2. for Bulb Type Stop Light


      1. Remove the stop light switch assembly Click here.

      2. A01VIFGE01
        Text in Illustration
        *a

        Component with harness connected

        (Stop Light Switch Assembly)
        *b Not pushed
        *c Pushed

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

        Standard Resistance
        Tester Connection Switch Condition Specified Condition
        1 - 2 Switch pin not pushed Below 1 Ω
        3 - 4 Switch pin not pushed 10 kΩ or higher
        1 - 2 Switch pin pushed 10 kΩ or higher
        3 - 4 Switch pin pushed Below 1 Ω

    NG

    REPLACE STOP LIGHT SWITCH ASSEMBLY Click here

    OK

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


    1. for LED Type Stop Light


      1. Disconnect the A101 stop light switch assembly connector.

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        F121-27 (STP-) - A101-2 (L) Always Below 1 Ω
        F121-28 (ST1-) - A101-4 (L) Always Below 1 Ω
        F121-27 (STP-) or A101-2 (L) - Body ground Always 10 kΩ or higher
        F121-28 (ST1-) or A101-4 (L) - Body ground Always 10 kΩ or higher

    2. for Bulb Type Stop Light


      1. Disconnect the A89 stop light switch assembly connector.

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        F121-27 (STP-) - A89-3 Always Below 1 Ω
        F121-28 (ST1-) - A89-1 Always Below 1 Ω
        F121-27 (STP-) or A89-3 - Body ground Always 10 kΩ or higher
        F121-28 (ST1-) or A89-1 - Body ground Always 10 kΩ or higher
        Result
        Result Proceed to
        OK (for LHD) A
        OK (for RHD) B
        NG C

    A

    REPLACE DRIVING SUPPORT ECU ASSEMBLY Click here

    B

    REPLACE DRIVING SUPPORT ECU ASSEMBLY Click here

    C

    REPAIR OR REPLACE HARNESS OR CONNECTOR