DTC Code | DTC Name |
---|---|
C1425 | Open in Stop Switch Circuit |
DESCRIPTION
The skid control ECU (brake booster with master cylinder assembly) detects the brake operating conditions through a signal transmitted by the stop light switch assembly.
The skid control ECU 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. | Detection Item | INF Code | DTC Detection Condition | Trouble Area | Note |
---|---|---|---|---|---|
C1425 | Open in Stop Switch Circuit | 231 | An open stop light switch circuit continues for 10 seconds or more. |
|
Electronically controlled brake system DTC |
WIRING DIAGRAM
Figure 1. w/ Canister Pump Module:
Figure 2. w/o Canister Pump Module:
CAUTION / NOTICE / HINT
Note
After replacing the skid control ECU (brake booster with master cylinder assembly), perform linear solenoid valve offset learning, ABS holding solenoid valve learning, yaw rate and acceleration sensor zero point calibration and system information memorization after performing "Reset Memory".
Inspect the fuses for circuits related to this system before performing the following procedure.
PROCEDURE
CHECK STOP LIGHT OPERATION
Check that the stop lights come on when the brake pedal is depressed and go off when the brake pedal is released.
OK | ||||||
---|---|---|---|---|---|---|
|
Result | |||
---|---|---|---|
|
NG |
INSPECT STOP LIGHT SWITCH ASSEMBLY Click here |
OK |
READ VALUE USING GTS (STOP LIGHT SWITCH ASSEMBLY)
Select the Data List on the GTS.
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 |
- |
Tester Display |
---|
Stop Light SW |
Check that the stop light switch assembly display observed on the GTS changes according to brake pedal operation.
OK |
---|
The GTS displays on or off according to brake pedal operation. |
Result | |||
---|---|---|---|
|
NG |
CHECK HARNESS AND CONNECTOR (STP TERMINAL) Click here |
OK |
RECONFIRM DTC
Clear the DTCs.
Turn the power switch off.
Turn the power switch on (READY).
Perform a road test.
Check if the same DTC is output.
Result | ||||||
---|---|---|---|---|---|---|
|
A |
USE SIMULATION METHOD TO CHECK Click here |
B |
REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY for LHD: Click here |
CHECK HARNESS AND CONNECTOR (STP TERMINAL)
*a | Front view of wire harness connector (to Skid Control ECU (Brake Booster with Master Cylinder Assembly)) |
Turn the power switch off.
Make sure that there is no looseness at the locking part and the connecting part of the connector.
OK |
---|
The connector is securely connected. |
Disconnect the A32 skid control ECU (brake booster with master cylinder assembly) connector.
Check both the connector case and the terminals for deformation and corrosion.
OK |
---|
No deformation or corrosion. |
Measure the voltage according to the value(s) in the table below.
Standard Voltage | |||||||||
---|---|---|---|---|---|---|---|---|---|
|
Result | |||
---|---|---|---|
|
OK |
REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY for LHD: Click here |
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR (STP CIRCUIT) |
INSPECT STOP LIGHT SWITCH ASSEMBLY
Check the stop light switch assembly.
OK |
---|
The stop light switch assembly is normal. |
Result | |||
---|---|---|---|
|
NG |
REPLACE STOP LIGHT SWITCH ASSEMBLY Click here |
OK |
CHECK HARNESS AND CONNECTOR (STP TERMINAL)
*a | Front view of wire harness connector (to Skid Control ECU (Brake Booster with Master Cylinder Assembly)) |
Turn the power switch off.
Make sure that there is no looseness at the locking part and the connecting part of the connector.
OK |
---|
The connector is securely connected. |
Disconnect the A32 skid control ECU (brake booster with master cylinder assembly) connector.
Check both the connector case and the terminals for deformation and corrosion.
OK |
---|
No deformation or corrosion. |
Measure the voltage according to the value(s) in the table below.
Standard Voltage | |||||||||
---|---|---|---|---|---|---|---|---|---|
|
Result | |||
---|---|---|---|
|
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR (STP CIRCUIT) |
OK |
RECONFIRM DTC
Reconnect the A32 skid control ECU (brake booster with master cylinder assembly) connector.
Clear the DTCs.
Turn the power switch off.
Turn the power switch on (READY).
Perform a road test.
Check if the same DTC is output.
Result | ||||||
---|---|---|---|---|---|---|
|
Tech Tips
If the lighting system is normal but the DTC is still output, replace the skid control ECU (brake booster with master cylinder assembly).
for LHD: Click here
for RHD: Click here
A |
USE SIMULATION METHOD TO CHECK Click here |
B |
INSPECT LIGHTING SYSTEM (STOP LIGHT CIRCUIT) Click here |