DTC C0040-9E: Brake Pedal Switch "A" Stuck On; DTC C0040-9F: Brake Pedal Switch "A" Stuck Off [08/2019 - ]: 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 [08/2019 - ]

   CHASSIS > BRAKE > DATA LIST
   
   

   Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
   Stop Light SW	Stop light switch assembly	OFF / ON	OFF: Brake pedal released ON: Brake pedal depressed	-
   Brake Pedal Load Sensing SW	Brake pedal load sensing switch	OFF / ON	OFF: Brake pedal released ON: Brake pedal depressed	-

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 OFF / ON according to brake pedal operation.

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

   OK

   First the stop light switch assembly should turn on, and then the brake pedal load sensing switch should turn 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  3

Result: 

C 

See step  5

Result: 

A 

See step  2

1. Clear the DTCs.

   Refer to DTC CHECK / CLEAR [08/2019 - ]

2. Turn the ignition switch off.
3. Start the engine.
4. Perform a road test.
5. Check if the same DTC is output.

   Refer to DTC CHECK / CLEAR [08/2019 - ]

   Result

   Result	Proceed to
   DTCs C0040-9E and C0040-9F are not output.	A
   DTCs C0040-9E and/or C0040-9F are output.	B

Result: 

A 

USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [08/2019 - ] 

Result: 

B 

REPLACE BRAKE ACTUATOR ASSEMBLY. Refer to  REMOVAL [08/2019 - ] 

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

   Refer to ON-VEHICLE INSPECTION [08/2015 - ]

   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 [08/2015 - ] 

Result: 

OK 

See step  4

1. Make sure that there is no looseness at the locking part and the connecting part of the connector.
2. Disconnect the A58 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
   A58- 27 (FSW+) - A55- 2 (FSW+)	Always	Below 1 Ω
   A58- 27 (FSW+) or A55- 2 (FSW+) - Body ground	Always	10 kΩ or higher
   A55- 1 (FSW-) - Body ground	Always	Below 1 Ω

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE BRAKE ACTUATOR ASSEMBLY. Refer to  REMOVAL [08/2019 - ] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

1. Turn the ignition switch off.
2. Check the brake pedal height and stop light switch assembly installation.

   Refer to INSTALLATION [08/2015 - ]

   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 [08/2015 - ] 

Result: 

NG 

ADJUST BRAKE PEDAL HEIGHT OR STOP LIGHT SWITCH ASSEMBLY INSTALLATION. Refer to  ADJUSTMENT [08/2015 - ]