| Last Modified: 08-21-2023 | 6.11:8.1.0 | Doc ID: RM100000001AZ8X |
| Model Year Start: 2019 | Model: Avalon | Prod Date Range: [04/2018 - 08/2021] |
| Title: BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: ELECTRONICALLY CONTROLLED BRAKE SYSTEM (for Gasoline Model): C1425; Open in Stop Light Switch Circuit; 2019 - 2021 MY Avalon [04/2018 - 08/2021] | ||
|
DTC |
C1425 |
Open in Stop Light Switch Circuit |
DESCRIPTION
The skid control ECU (brake actuator assembly) receives stop light switch assembly signals and uses them to determine whether or not the brakes are applied.
The skid control ECU (brake actuator assembly) has a detection circuit that it uses to detect an open in the stop light input line.
If the skid control ECU (brake actuator assembly) detects an open in this circuit, it will store this DTC.
|
DTC No. |
Detection Item |
DTC Detection Condition |
Trouble Area |
|---|---|---|---|
|
C1425 |
Open in Stop Light Switch Circuit |
An open in the stop light switch assembly input line continues for 3 seconds or more. |
|
WIRING DIAGRAM
Ref to DTC C1249.
Click here
![2019 - 2021 MY Avalon [04/2018 - 08/2021]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: ELECTRONICALLY CONTROLLED BRAKE SYSTEM (for Gasoline Model): C1249; Open Circuit in Stop Light Switch Circuit](/t3Portal/stylegraphics/info.gif)
CAUTION / NOTICE / HINT
NOTICE:
-
When replacing the skid control ECU (brake actuator assembly), perform system variant learning and acceleration sensor zero point calibration.
Click here
- Inspect the fuses for circuits related to this system before performing the following procedure.
PROCEDURE
|
1. |
READ VALUE USING TECHSTREAM (BS1 VOLTAGE VALUE) |
(a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG).
(c) Enter the following menus: Chassis / ABS/VSC/TRAC/EPB / Data List.
Chassis > ABS/VSC/TRAC/EPB > Data List
|
Tester Display |
Measurement Item |
Range |
Normal Condition |
Diagnostic Note |
|---|---|---|---|---|
|
BS1 Voltage Value |
+BS voltage value |
Min.: 0.00 V, Max.: 20.00 V |
- |
Changes in proportion to battery voltage |
Chassis > ABS/VSC/TRAC/EPB > Data List
|
Tester Display |
|---|
|
BS1 Voltage Value |
(d) Take a note of the +BS voltage value.
HINT:
The noted +BS voltage value is used in a later step.
|
|
2. |
INSPECT STOP LIGHT SWITCH ASSEMBLY |
(a) Inspect the stop light switch assembly.
Click here
OK:
The stop light switch assembly is normal.
| NG |
|
|
|
3. |
READ VALUE USING TECHSTREAM (STOP LIGHT SWITCH ASSEMBLY) |
(a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG).
(c) Enter the following menus: Chassis / ABS/VSC/TRAC/EPB / Data List.
Chassis > ABS/VSC/TRAC/EPB > Data List
|
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 |
- |
Chassis > ABS/VSC/TRAC/EPB > Data List
|
Tester Display |
|---|
|
Stop Light SW |
(d) Check that the stop light switch assembly display observed on the Techstream changes according to brake pedal operation.
OK:
The Techstream displays on or off according to brake pedal operation.
| NG |
|
|
|
4. |
RECONFIRM DTC |
(a) Clear the DTCs.
Chassis > ABS/VSC/TRAC/EPB > Clear DTCs
(b) Turn the engine switch off.
(c) Start the engine.
(d) Depress the brake pedal several times to test the stop light circuit.
(e) Check if the same DTC is output.
Chassis > ABS/VSC/TRAC/EPB > Trouble Codes
|
Result |
Proceed to |
|---|---|
|
C1425 is not output |
A |
|
C1425 is output |
B |
| A |
|
| B |
|
REPLACE BRAKE ACTUATOR ASSEMBLY
|
|
5. |
CHECK HARNESS AND CONNECTOR (STP TERMINAL) |
|
(a) Turn the engine switch off. |
|
(b) Make sure that there is no looseness at the locking part and the connecting part of the connector.
OK:
The connector is securely connected.
(c) Disconnect the A28 skid control ECU (brake actuator assembly) connector.
(d) Check both the connector case and the terminals for deformation and corrosion.
OK:
No deformation or corrosion.
(e) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
A28-42 (STP) - Body ground |
Stop light switch assembly on (Brake pedal depressed) |
(+BS x 0.85) to 14 V* |
|
A28-42 (STP) - Body ground |
Stop light switch assembly off (Brake pedal released) |
Below 1.5 V |
HINT:
*: The minimum voltage value varies depending on the +BS terminal voltage value. The minimum voltage is 85% or more of the +BS terminal voltage.
| OK |
|
REPLACE BRAKE ACTUATOR ASSEMBLY
|
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR (STP CIRCUIT) |
|
|