DYNAMIC RADAR CRUISE CONTROL SYSTEM, 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 dynamic radar 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. DTC Detection Condition Trouble Area
C1A05 When the power switch is on (IG) or the cruise control main switch (ON-OFF button) is on, the driving support ECU assembly detects a malfunction in the signal received from the stop light switch assembly.

  • Stop light switch assembly

  • Wire harness or connector

  • Driving support ECU assembly

WIRING DIAGRAM

A01I57EE02

INSPECTION PROCEDURE

Note


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

  • When replacing the driving support ECU assembly, always replace it with a new one. If a driving support ECU assembly which was installed to another vehicle is used, the information stored in the driving support ECU assembly will not match the information from the vehicle. As a result, a DTC may be stored.

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (POWER SOURCE)


    1. Disconnect the A33 stop light switch assembly connector.

    2. A01I4G6E17
      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 Condition Specified Condition
      A33-4 - Body ground Power switch off 11 to 14 V
      A33-2 - Body ground Power switch on (IG) 11 to 14 V

    3. Turn the power switch off

    4. Reconnect the A33 stop light switch assembly connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. INSPECT STOP LIGHT SWITCH ASSEMBLY


    1. A01I4GBE05
      Text in Illustration
      *a

      Component without harness connected

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

      Remove the stop light switch assembly Click here.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      1 - 2 Switch pin not pushed Below 0.1 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 200 Ω

    NG

    REPLACE STOP LIGHT SWITCH ASSEMBLY Click here

    OK

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


    1. Disconnect the A33 stop light switch assembly connector.

    2. Disconnect the I183 driving support ECU 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
      A33-3 - I183-28 (ST1-) Always Below 1 Ω
      A33-1 - I183-27 (STP-) Always Below 1 Ω
      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      A33-3 or I183-28 (ST1-) - Body ground Always 10 kΩ or higher
      A33-1 or I183-27 (STP-) - Body ground Always 10 kΩ or higher

    4. Reconnect the A33 stop light switch assembly connector.

    5. Reconnect the I183 driving support ECU assembly connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE DRIVING SUPPORT ECU ASSEMBLY Click here