DTC C1429: Open or Short in Brake Pedal Load Sensing Switch [12/2013 - 11/2016]: 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 [12/2013 - 11/2016]

   Chassis > ABS/VSC/TRAC > Data List 

   Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
   Brake Pedal Load Sensing SW	Brake pedal load sensing switch	ON or OFF	ON: Brake pedal depressed beyond a specified point OFF: Brake pedal not depressed beyond a specified point	-

   Chassis > ABS/VSC/TRAC > Data List 

   Tester Display
   Brake Pedal Load Sensing SW

4. Check that the brake pedal load sensing switch display observed on the Techstream changes according to brake pedal operation.

   OK

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

Result:

NG 

See step  3

Result:

OK 

Go to next step 

1. Turn the ignition switch off.
2. Clear the DTCs.

   Refer to DTC CHECK / CLEAR [12/2013 - 11/2016]

   Chassis > ABS/VSC/TRAC > Clear DTCs 

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

   Refer to DTC CHECK / CLEAR [12/2013 - 11/2016]

   Chassis > ABS/VSC/TRAC > Trouble Codes 

   Result	Proceed to
   DTC C1429 is not output.	A
   DTC C1429 is output.	B

Result:

A 

USE SIMULATION METHOD TO CHECK. 

Refer to HOW TO PROCEED WITH TROUBLESHOOTING [12/2013 - 11/2016]

Result:

B 

REPLACE BRAKE ACTUATOR ASSEMBLY. 

Refer to REMOVAL [12/2013 - 11/2016]

1. Turn the ignition switch off.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Component without harness connected (Brake Pedal Load Sensing Switch (Brake Pedal Support Assembly))

2. Make sure that there is no looseness at the locking part and the connecting part of the connector.
3. Disconnect the A55 brake pedal load sensing switch (brake pedal support assembly) connector.
   NOTE:

   • Do not remove the brake pedal load sensing switch from the brake pedal support assembly.
   • When there is a malfunction in the brake pedal load sensing switch, replace the brake pedal support assembly.
4. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   2 (FSW+) - 1 (FSW-)	Switch OFF (Brake pedal depressed)	950 to 1050 Ω
   2 (FSW+) - 1 (FSW-)	Switch ON (Brake pedal released)	203 to 223 Ω

Result:

NG 

REPLACE BRAKE PEDAL SUPPORT ASSEMBLY. 

Refer to REMOVAL [12/2013 - ]

Result:

OK 

Go to next step 

1. Make sure that there is no looseness at the locking part and the connecting part of the connector.
2. Disconnect the A47 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
   A47-27 (FSW+) - A55-2 (FSW+)	Always	Below 1 Ω
   A47-27 (FSW+) or A55-2 (FSW+) - Body ground	Always	10 kΩ or higher
   A55-1 (FSW-) - Body ground	Always	Below 1 Ω

Result:

OK 

REPLACE BRAKE ACTUATOR ASSEMBLY. 

Refer to REMOVAL [12/2013 - 11/2016]

Result:

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR