Last Modified: 04-05-2023 |
6.11:8.1.0 |
Doc ID: RM1000000018KEP |
Model Year Start: 2018 |
Model: Sienna |
Prod Date Range: [11/2017 -
] |
Title: BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: C1425; Open in Stop Light Switch Circuit; 2018 - 2020 MY Sienna [11/2017 - ] |
DTC
|
C1425
|
Open in Stop Light Switch Circuit
|
DESCRIPTION
The skid control ECU (brake actuator assembly) detects the brake operating conditions through a signal transmitted by the stop light switch assembly.
The skid control ECU (brake actuator assembly) incorporates a circuit to detect an open circuit. This DTC is output when an open circuit is detected in the stop light signal input line.
DTC No.
|
DTC Detection Condition
|
Trouble Area
|
C1425
|
When voltage at terminal +BS is 9.5 to 17.4 V, open circuit occurs between STP terminal circuits A and B for 0.3 seconds or more.
|
-
Wire harness or connector
-
Stop light switch assembly
-
Skid control ECU (brake actuator assembly)
|
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
).
-
Inspect the fuses for circuits related to this system before performing the following inspection procedure.
PROCEDURE
1.
|
CHECK STOP LIGHT OPERATION
|
(a) Check that the stop lights come on when the brake pedal is depressed and go off when the brake pedal is released.
OK:
Condition
|
Illumination Condition
|
Brake pedal depressed.
|
On
|
Brake pedal released.
|
Off
|
OK
|
|
|
2.
|
READ VALUE USING TECHSTREAM (STOP LIGHT SWITCH ASSEMBLY)
|
(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
|
Stop Light SW
|
Stop light switch assembly / ON or OFF
|
ON: Brake pedal depressed
OFF: Brake pedal released
|
-
|
(f) Check that the stop light switch assembly condition observed on the Techstream changes according to brake pedal operation.
OK:
The Techstream displays ON or OFF according to brake pedal operation.
OK
|
|
|
(a) Turn the ignition switch off.
(b) Clear the DTCs (See page
).
(c) Turn the ignition switch off.
(d) Start the engine.
(e) Depress the brake pedal several times to test the stop light circuit.
(f) Check if the same DTC is output (See page
).
Result
|
Proceed to
|
DTC C1425 is not output.
|
A
|
DTC C1425 is output.
|
B
|
HINT:
If troubleshooting has been carried out according to Problem Symptoms Table, refer back to the table and proceed to the next step (See page
).
4.
|
INSPECT STOP LIGHT SWITCH ASSEMBLY
|
(a) for Bulb Type Stop Light
(1) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
|
Switch Condition
|
Specified Condition
|
1 - 2
|
Switch pin released
|
Below 1 Ω
|
Switch pin pushed in
|
10 kΩ or higher
|
Text in Illustration
*a
|
Component without harness connected
(Stop Light Switch Assembly)
|
|
|
(b) for LED Type Stop Light
(1) Reconnect the stop light switch assembly connector.
(2) Measure the resistance according to the value(s) in the table below.
Standard Voltage:
Tester Connection
|
Condition
|
Specified Condition
|
A59-2 (L) - A59-3 (GND)
|
Switch pin released
|
8 to 14 V
|
Switch pin pushed in
|
Below 1.5 V
|
Text in Illustration
*a
|
Component with harness connected
(Stop Light Switch Assembly)
|
Result
Result
|
Proceed to
|
OK (w/ Toyota Safety Sense P)
|
A
|
OK (w/o Toyota Safety Sense P)
|
B
|
NG
|
C
|
|
|
A
|
|
|
5.
|
CHECK HARNESS AND CONNECTOR (SWITCH INPUT TERMINAL)
|
(a) Turn the ignition switch off.
(b) Remove the STOP LP relay.
(c) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection
|
Switch Condition
|
Specified Condition
|
STOP LP relay terminal 4 - Body ground
|
Stop light switch assembly ON (Brake pedal depressed)
|
8 to 14 V
|
STOP LP relay terminal 4 - Body ground
|
Stop light switch assembly OFF (Brake pedal released)
|
Below 1.5 V
|
Text in Illustration
*1
|
Engine Room Relay Block
|
*2
|
STOP LP Relay Holder
|
|
|
NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR (SWITCH INPUT CIRCUIT)
|
OK
|
|
|
(a) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
|
Condition
|
Specified Condition
|
3 - 4
|
Voltage is not applied between terminals 1 and 2
|
Below 1 Ω
|
3 - 4
|
Voltage is applied between terminals 1 and 2
|
10 kΩ or higher
|
Text in Illustration
|
|
NG |
|
REPLACE STOP LP RELAY
|
OK
|
|
|
7.
|
CHECK HARNESS AND CONNECTOR (STP TERMINAL)
|
(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 skid control ECU (brake actuator assembly) connector.
(d) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection
|
Switch Condition
|
Specified Condition
|
A75-35 (STP) - Body ground
|
Stop light switch assembly ON (Brake pedal depressed)
|
8 to 14 V
|
A75-35 (STP) - Body ground
|
Stop light switch assembly OFF (Brake pedal released)
|
Below 1.5 V
|
Text in Illustration
*a
|
Front view of wire harness connector
(to Skid Control ECU (Brake Actuator Assembly))
|
HINT:
-
If troubleshooting has been carried out according to Problem Symptoms Table, refer back to the table and proceed to the next step before replacing parts (See page
).
|
|
NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR (STP CIRCUIT)
|
OK
|
|
|
(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 voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection
|
Condition
|
Specified Condition
|
A75-35 (STP) - Body ground
|
Stop light switch assembly on (Brake pedal depressed)
|
8 to 14 V
|
A75-35 (STP) - Body ground
|
Stop light switch assembly off (Brake pedal released)
|
Below 1.5 V
|
Text in Illustration
*a
|
Front view of wire harness connector
(to Skid Control ECU (Brake Actuator Assembly))
|
(d) Turn the ignition switch off.
(e) Reconnect the A75 skid control ECU (brake actuator assembly) connector.
(f) Clear the DTCs (See page
).
(g) Turn the ignition switch off.
(h) Start the engine.
(i) Check if the same DTC is output (See page
).
Result
Result
|
Proceed to
|
DTC C1425 is not output.
|
A
|
DTC C1425 is output.
|
B
|
HINT:
-
If the lighting system is normal but the DTC is still output, replace the skid control ECU (brake actuator assembly).
-
If troubleshooting has been carried out according to Problem Symptoms Table, refer back to the table and proceed to the next step (See page
).
9.
|
CHECK HARNESS AND CONNECTOR (STP TERMINAL)
|
(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 skid control ECU (brake actuator assembly) connector.
(d) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection
|
Switch Condition
|
Specified Condition
|
A75-35 (STP) - Body ground
|
Stop light switch assembly ON (Brake pedal depressed)
|
8 to 14 V
|
A75-35 (STP) - Body ground
|
Stop light switch assembly OFF (Brake pedal released)
|
Below 1.5 V
|
Text in Illustration
*a
|
Front view of wire harness connector
(to Skid Control ECU (Brake Actuator Assembly))
|
HINT:
If troubleshooting has been carried out according to Problem Symptoms Table, refer back to the table and proceed to the next step before replacing parts (See page
).
|
|
NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR (STP CIRCUIT)
|
|