Last Modified: 04-05-2023 6.11:8.1.0 Doc ID: RM100000000VIWD
Model Year Start: 2016 Model: Sienna Prod Date Range: [12/2015 - 11/2017]
Title: BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: C1429; Open or Short in Brake Pedal Load Sensing Switch; 2016 - 2017 MY Sienna [12/2015 - 11/2017]

DTC

C1429

Open or Short in Brake Pedal Load Sensing Switch

DESCRIPTION

The brake pedal load sensing switch is turned on when the brake pedal is depressed with force exceeding a predetermined level.

The skid control ECU detects if the brake pedal is depressed or not via this circuit.

DTC Code

DTC Detection Condition

Trouble Area

C1429

An open or short in the brake pedal load sensing switch continues for 0.3 seconds or more.

  • Brake pedal load sensing switch
  • Brake pedal load sensing switch circuit
  • Brake actuator assembly (Skid control ECU)

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

When replacing the brake actuator assembly, perform zero point calibration and store system information (See page 2016 - 2017 MY Sienna [12/2015 - 11/2017]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: CALIBRATION ).

HINT:

When DTC C1425 and/or C1426 is output together with DTC C1429, inspect and repair the trouble areas indicated by DTC C1425 and/or C1426 first (See page 2016 - 2017 MY Sienna [12/2015 - 11/2017]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: C1425; Open in Stop Light Switch Circuit , or 2016 - 2017 MY Sienna [12/2015 - 11/2017]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: C1426; Stop Light Switch OFF Stuck Malfunction ).

PROCEDURE

1.

READ VALUE USING TECHSTREAM (BRAKE PEDAL LOAD SENSING SWITCH)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Enter the following menus: Chassis / ABS/VSC/ TRAC / Data List.

(e) Select the Data List on the Techstream (See page 2016 MY Sienna [12/2015 - 08/2016]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: DATA LIST / ACTIVE TEST 2017 MY Sienna [08/2016 - 11/2017]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: DATA LIST / ACTIVE TEST ).

ABS/VSC/TRAC

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 the specified point

OFF: Brake pedal not depressed beyond the specified point

-

(f) 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.

NG

GO TO STEP 3

OK

2.

RECONFIRM DTC

(a) Turn the ignition switch off.

(b) Clear the DTCs (See page 2016 - 2017 MY Sienna [12/2015 - 11/2017]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: DTC CHECK / CLEAR ).

(c) Start the engine.

(d) Perform the road test.

(e) Check if the same DTC is recorded (See page 2016 - 2017 MY Sienna [12/2015 - 11/2017]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: DTC CHECK / CLEAR ).

Result

Result

Proceed to

DTC (C1429) is not output

A

DTC (C1429) is output

B

A

CHECK FOR INTERMITTENT PROBLEMS

(See page 2016 MY Sienna [12/2015 - 08/2016]; INTRODUCTION: HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS: HOW TO PROCEED WITH TROUBLESHOOTING 2017 MY Sienna [08/2016 - 11/2017]; INTRODUCTION: HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS: HOW TO PROCEED WITH TROUBLESHOOTING )

B

REPLACE BRAKE ACTUATOR ASSEMBLY

3.

INSPECT BRAKE PEDAL LOAD SENSING SWITCH

Text in Illustration

*a

Component without harness connected

(Brake Pedal Load Sensing Switch)

*b

Brake Pedal Released (ON)

*c

Brake Pedal Depressed (OFF)

NOTICE:

  • Do not remove the brake pedal load sensing switch from the brake pedal sub-assembly.
  • When there is a malfunction in the brake pedal load sensing switch, replace the brake pedal sub-assembly.

(a) Turn the ignition switch off.

(b) Make sure that there is no looseness at the locking part and the connecting part of the connector.

(c) Disconnect the brake pedal load sensing switch connector.

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

Standard Resistance:

Tester Connection

Switch Condition

Specified Condition

2 (FSW+) - 1 (GND)

Brake pedal load sensing switch OFF

(Brake pedal depressed)

950 to 1050 Ω

2 (FSW+) - 1 (GND)

Brake pedal load sensing switch ON

(Brake pedal released)

203 to 223 Ω

NG

REPLACE BRAKE PEDAL SUB-ASSEMBLY (BRAKE PEDAL LOAD SENSING SWITCH)

OK

4.

CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - BRAKE PEDAL LOAD SENSING SWITCH)

(a) Make sure that there is no looseness at the locking part and the connecting part of the connector.

(b) Disconnect the skid control ECU connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A4-27 (FSW+) - A7-2 (FSW+)

Always

Below 1 Ω

A4-27 (FSW+) - Body ground

Always

10 kΩ or higher

A7-1 (GND) - Body ground

Always

Below 1 Ω

OK

REPLACE BRAKE ACTUATOR ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR