Vehicle Stability Control System (for Hydraulic Brake Booster)
BRAKE CONTROL: VEHICLE STABILITY CONTROL SYSTEM (for Hydraulic Brake Booster): C1425: Open in Stop Light Switch Circuit
C1425 - Open in Stop Light Switch Circuit
DESCRIPTION
The skid control ECU (master cylinder solenoid) inputs stop light switch signals and the brake operation condition.
The skid control ECU (master cylinder solenoid) has an open detection circuit, which outputs this DTC when detecting an open circuit in the stop light input line or the ground line of the stop light circuit with the stop light switch off (brake pedal not depressed).
WIRING DIAGRAM
INSPECTION PROCEDURE
NOTICE:
When replacing the master cylinder solenoid, perform calibration Vehicle Stability Control System (for Hydraulic Brake Booster).
PROCEDURE
1. CHECK STOP LIGHT SWITCH OPERATION Vehicle Stability Control System (for Hydraulic Brake Booster)
NG -- CHECK HARNESS AND CONNECTOR (POWER SOURCE TERMINAL)
OK -- Continue to next step.
2. READ VALUE USING TECHSTREAM (STOP LIGHT SW)
(a) Turn the ignition switch off.
(b) Connect the Techstream to the DLC3.
(c) Turn the ignition switch to ON.
(d) Turn the Techstream on.
(e) Enter the following menus: Chassis / ABS/VSC/TRAC / Data List.
ABS/VSC/TRAC
(f) Check that the stop light condition observed on the Techstream changes according to brake pedal operation.
Standard:
The Techstream displays ON or OFF according to brake pedal operation.
NG -- CHECK HARNESS AND CONNECTOR (STP TERMINAL)
OK -- USE SIMULATION METHOD TO CHECK Electronic Circuit Inspection Procedure
3. CHECK HARNESS AND CONNECTOR (STP TERMINAL) Vehicle Stability Control System (for Hydraulic Brake Booster)
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (STP CIRCUIT)
OK -- Continue to next step.
4. RECONFIRM DTC
(a) Clear the DTCs Vehicle Stability Control System (for Hydraulic Brake Booster).
(b) Turn the ignition 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 Vehicle Stability Control System (for Hydraulic Brake Booster).
Result
B -- REPLACE MASTER CYLINDER SOLENOID Disassembly
A -- USE SIMULATION METHOD TO CHECK Electronic Circuit Inspection Procedure
5. CHECK HARNESS AND CONNECTOR (POWER SOURCE TERMINAL) Vehicle Stability Control System (for Hydraulic Brake Booster)
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)
OK -- Continue to next step.
6. INSPECT STOP LIGHT SWITCH ASSEMBLY Vehicle Stability Control System (for Hydraulic Brake Booster)
NG -- REPLACE STOP LIGHT SWITCH ASSEMBLY
OK -- Continue to next step.
7. CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH ASSEMBLY - STOP LP CTRL RELAY) Vehicle Stability Control System (for Hydraulic Brake Booster)
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
8. INSPECT STOP LP CTRL RELAY Vehicle Stability Control System (for Hydraulic Brake Booster)
NG -- REPLACE STOP LP CTRL RELAY
OK -- Continue to next step.
9. CHECK HARNESS AND CONNECTOR (REAR COMBINATION LIGHT ASSEMBLY, HIGH MOUNTED STOP LIGHT ASSEMBLY - STOP LP CTRL RELAY) Vehicle Stability Control System (for Hydraulic Brake Booster)
B -- INSPECT REAR COMBINATION LIGHT ASSEMBLY
C -- INSPECT CENTER STOP LIGHT BULB
A -- REPAIR OR REPLACE HARNESS OR CONNECTOR
10. INSPECT REAR COMBINATION LIGHT ASSEMBLY Vehicle Stability Control System (for Hydraulic Brake Booster)
NG -- REPLACE REAR COMBINATION LIGHT ASSEMBLY
OK -- USE SIMULATION METHOD TO CHECK Electronic Circuit Inspection Procedure
11. INSPECT CENTER STOP LIGHT BULB Vehicle Stability Control System (for Hydraulic Brake Booster)
NG -- REPLACE CENTER STOP LIGHT BULB
OK -- USE SIMULATION METHOD TO CHECK Electronic Circuit Inspection Procedure