- Brake pedal load sensing switch (brake pedal support assembly)
- Brake pedal load sensing switch circuit
- Skid control ECU (brake actuator assembly)
| Last Modified: 04-05-2023 | 6.11:8.1.0 | Doc ID: RM1000000018KET |
| Model Year Start: 2018 | Model: Sienna | Prod Date Range: [11/2017 - ] |
| Title: BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: C1429; Open or Short in Brake Pedal Load Sensing Switch; 2018 - 2020 MY Sienna [11/2017 - ] | ||
|
DTC |
C1429 |
Open or Short in Brake Pedal Load Sensing Switch |
DESCRIPTION
The brake pedal load sensing switch (brake pedal support assembly) turns on when the brake pedal is depressed with a force exceeding a predetermined level.
The skid control ECU (brake actuator assembly) uses this circuit to detect if the brake pedal is depressed or not.
|
DTC No. |
DTC Detection Condition |
Trouble Area |
|---|---|---|
|
C1429 |
An open or short in the brake pedal load sensing switch circuit continues for 0.3 seconds or more. |
|
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
When replacing the skid control ECU (brake actuator assembly), perform zero point calibration and store system information (See page
![2018 - 2020 MY Sienna [11/2017 - ]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: CALIBRATION](/t3Portal/stylegraphics/info.gif)
).
HINT:
When C1425 and/or C1426 is output together with C1429, inspect and repair the trouble areas indicated by C1425 and/or C1426 first (See page
and/or
).
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 using the Techstream (See page
).
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 a specified point OFF: Brake pedal not depressed beyond a 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 |
|
|
|
2. |
RECONFIRM DTC |
(a) Turn the ignition switch off.
(b) Clear the DTCs (See page
).
(c) Turn the ignition switch off.
(d) Start the engine.
(e) Perform a road test.
(f) Check if the same DTC is output (See page
).
|
Result |
Proceed to |
|---|---|
|
DTC C1429 is not output. |
A |
|
DTC C1429 is output. |
B |
| A |
|
| B |
|
|
3. |
INSPECT BRAKE PEDAL LOAD SENSING SWITCH (BRAKE PEDAL SUPPORT 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 connectors.
(c) Disconnect the A7 brake pedal load sensing switch (brake pedal support assembly) connector.
NOTICE:
- 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.
(d) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
2 - 1 |
Brake pedal load sensing switch off (Brake pedal depressed) |
950 to 1050 Ω |
|
2 - 1 |
Brake pedal load sensing switch on (Brake pedal released) |
203 to 223 Ω |
Text in Illustration
|
*a |
Component without harness connected (Brake Pedal Load Sensing Switch (Brake Pedal Support Assembly)) |
| NG |
|
REPLACE BRAKE PEDAL LOAD SENSING SWITCH (BRAKE PEDAL SUPPORT ASSEMBLY) |
|
|
4. |
CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - BRAKE PEDAL SUPPORT ASSEMBLY) |
(a) Make sure that there is no looseness at the locking part and the connecting part of the connectors.
(b) Disconnect the A75 skid control ECU (brake actuator assembly) connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
A75-23 (FSW+) - A7-2 |
Always |
Below 1 Ω |
|
A75-23 (FSW+) - Body ground |
Always |
10 kΩ or higher |
|
A7-1 - Body ground |
Always |
Below 1 Ω |
| OK |
|
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|