MULTI-MODE MANUAL TRANSAXLE SYSTEM, Diagnostic DTC:P0703

DTC Code DTC Name
P0703 Brake Switch "B" Circuit

DESCRIPTION

When the brake pedal is depressed, stop light switch signal STP turns on and stop light switch signal ST1- turns off. The TCM detects whether the brake pedal is depressed or released based on those signals. If the signal conditions, STP and ST1-, do not match the standard condition, the TCM interprets this as a malfunction in the stop light switch circuit and stores this DTC.

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Warning Indicate Memory
P0703 Brake Switch "B" Circuit

Following conditions detected simultaneously for 1.0 second or more

(1-trip detection logic)


  1. Ignition switch is ON.

  2. STP signal is OFF

  3. ST1- signal is OFF.

  • Wire harness or connector

  • Stop light switch assembly

  • TCM

 Does not come on Comes on DTC stored

WIRING DIAGRAM

B00444AE01

CAUTION / NOTICE / HINT

Note

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

PROCEDURE


  1. READ VALUE USING GTS (BRAKE SWITCH SIGNAL 1 AND 2)


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Enter the following menus: Powertrain / Multi-Mode M/T / Data List / Brake Switch Signal1 and Brake Switch Signal2.

    5. According to the display on the GTS, read the Data List.


      Powertrain > Multi-Mode M/T > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Brake Switch Signal2 Brake switch signal (ST1-) OFF or ON

      OFF: Brake pedal depressed

      ON: Brake pedal released

      		 ST1- terminal signal of TCM
      Brake Switch Signal1 Brake switch signal (STP) OFF or ON

      OFF: Brake pedal released

      ON: Brake pedal depressed

      		 STP terminal signal of TCM

      Powertrain > Multi-Mode M/T > Data List
      Tester Display
      Brake Switch Signal2
      Brake Switch Signal1
      OK
      The normal conditions listed above are shown on the GTS when the brake pedal is operated.
      Result
      Proceed to
      OK
      NG

    OK

    SYMPTOM SIMULATION AND DTC CHECK Click here

    NG

  2. 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

  3. CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH ASSEMBLY - BATTERY AND BODY GROUND)


    1. Disconnect the A176 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
      A176-2 (GND) - Body ground Always Below 1 Ω

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A176-7 (B) - Body ground Always 11 to 14 V
      A176-6 (B) - Body ground Ignition switch ON 11 to 14 V

    4. Connect the A176 stop light switch assembly connector.

      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH ASSEMBLY - TCM)


    1. Disconnect the E104 TCM connector.

    2. Turn the ignition switch to ON.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      E104-34 (STP) - Body ground Brake pedal depressed 11 to 14 V
      Brake pedal released Below 1 V
      E104-35 (ST1-) - Body ground Brake pedal depressed Below 1 V
      Brake pedal released 11 to 14 V

    4. Connect the E104 TCM connector.

    5. Turn the ignition switch off.

      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. REPLACE TCM


    1. Replace the TCM.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

    PERFORM INITIALIZATION Click here