DTC C0040-9E: Brake Pedal Switch "A" Stuck On; DTC C0040-9F: Brake Pedal Switch "A" Stuck Off [11/2018 - ]: Procedure

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch to ON.
3. Select the Data List using the Techstream.

   Refer to DATA LIST / ACTIVE TEST [11/2018 - ]

   Chassis > Brake/EPB > Data List 

   Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
   Stop Light SW	Stop light switch assembly (STP terminal input)	OFF / ON	OFF: Brake pedal released ON: Brake pedal depressed	HINT:  The brake pedal state is determined using the voltage at terminal STP
   Brake Pedal Load Sensing SW	Brake pedal load sensing switch (brake pedal support assembly)	OFF / ON	OFF: Brake pedal load sensing switch (brake pedal support assembly) OFF ON: Brake pedal load sensing switch (brake pedal support assembly) ON	-

   Chassis > Brake/EPB > Data List 

   Tester Display
   Stop Light SW
   Brake Pedal Load Sensing SW

4. Check that the stop light switch display and brake pedal load sensing switch display observed on the Techstream change according to brake pedal operation.

   OK

   The Techstream displays ON or OFF according to brake pedal operation.

5. Slowly depress the brake pedal, and check when the stop light switch and brake pedal load sensing switch turn on.

   OK

   First the stop light switch turns on, and then the brake pedal load sensing switch turns on.

   Result

   Result	Proceed to
   OK	A
   NG (Turning on of the brake pedal load sensing switch is not confirmed.)	B
   NG (The brake pedal load sensing switch turns on first.)	C

Result: 

B 

See step  4

Result: 

C 

See step  6

Result: 

A 

See step  2

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch to ON.
3. Operate the Techstream to clear the codes. Enter the following menus: Chassis / Brake/EPB / Trouble Codes.

   Chassis > Brake/EPB > Clear DTCs 

4. Press the DTC clear button.

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  3

1. Connect the Techstream to the DLC3.
2. Start the engine.
3. Perform a road test under the same malfunction conditions recreated based on the Freeze Frame Data or customer problem analysis.
4. Read the DTCs following the prompts on the Techstream. Enter the following menus: Chassis / Brake/EPB / Trouble Codes.

   Chassis > Brake/EPB > Trouble Codes 

5. Check if the same DTC is output.

   Result

   Result	Proceed to
   C0040-9E and C0040-9F is not output	A
   C0040-9E and/or C0040-9F is output	B

Result: 

A 

END 

Result: 

B 

REPLACE BRAKE ACTUATOR ASSEMBLY. Refer to  REMOVAL [11/2018 - 10/2019]  , or refer to  REMOVAL [10/2019 - 08/2020]  , or refer to  REMOVAL [08/2020 - 10/2022]  , or refer to  REMOVAL [10/2022 - 10/2023]  , or refer to  REMOVAL [10/2023 - ] 

1. Inspect the brake pedal load sensing switch (brake pedal support assembly).

   Refer to ON-VEHICLE INSPECTION [11/2018 - ]

   OK

   The brake pedal load sensing switch (brake pedal support assembly) is normal.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE BRAKE PEDAL SUPPORT ASSEMBLY. Refer to  REMOVAL [11/2018 - 10/2019]  , or refer to  REMOVAL [10/2019 - 08/2020]  , or refer to  REMOVAL [08/2020 - 12/2021]  , or refer to  REMOVAL [12/2021 - 10/2022]  , or refer to  REMOVAL [10/2022 - 10/2023]  , or refer to  REMOVAL [10/2023 - ] 

Result: 

OK 

See step  5

1. Make sure that there is no looseness at the locking part and the connecting part of the connector.
2. Disconnect the A39 skid control ECU (brake actuator assembly) connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   A39-10 (HZRI) - A43-2 (FSW+)	Always	Below 1 Ω
   A39-10 (HZRI) - Body ground	Always	10 kΩ or higher
   A43-2 (FSW+) - Body ground	Always	10 kΩ or higher
   A43-1 (FSW-) - Body ground	Always	Below 1 Ω

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE BRAKE ACTUATOR ASSEMBLY. Refer to  REMOVAL [11/2018 - 10/2019]  , or refer to  REMOVAL [10/2019 - 08/2020]  , or refer to  REMOVAL [08/2020 - 10/2022]  , or refer to  REMOVAL [10/2022 - 10/2023]  , or refer to  REMOVAL [10/2023 - ] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

1. Turn the ignition switch off.
2. Check the brake pedal height.

   Refer to ADJUSTMENT [11/2018 - 12/2021] , or refer to ADJUSTMENT [12/2021 - ]

3. Check the stop light switch assembly installation.

   Refer to INSTALLATION [11/2018 - ]

   OK

   The brake pedal height and stop light switch assembly installation are normal.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE BRAKE PEDAL SUPPORT ASSEMBLY. Refer to  REMOVAL [11/2018 - 10/2019]  , or refer to  REMOVAL [10/2019 - 08/2020]  , or refer to  REMOVAL [08/2020 - 12/2021]  , or refer to  REMOVAL [12/2021 - 10/2022]  , or refer to  REMOVAL [10/2022 - 10/2023]  , or refer to  REMOVAL [10/2023 - ] 

Result: 

NG 

ADJUST BRAKE PEDAL OR STOP LIGHT SWITCH ASSEMBLY. Refer to  ADJUSTMENT [11/2018 - 12/2021]  , or refer to  ADJUSTMENT [12/2021 - ]