DESCRIPTION
WIRING DIAGRAM
INSPECTION PROCEDURE
CHECK BRAKE FLUID LEVEL
INSPECT BRAKE FLUID LEVEL WARNING SWITCH
CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - BRAKE FLUID LEVEL WARNING SWITCH)
RECONFIRM DTC
DTC C1453 Reservoir Level Switch Disconnected
DTC C1454 Reservoir Level Low
DESCRIPTION
The brake fluid level warning switch (brake master cylinder reservoir sub-assembly) sends the appropriate signal to the skid control ECU (master cylinder solenoid) when the brake fluid level drops.
| DTC Code | DTC Detection Condition | Trouble Area |
| C1453 | With the ECU terminal IG1 voltage at 10 to 14 V, an open in the brake fluid level warning switch circuit continues for 2 seconds or more. | Brake fluid level
Brake fluid level warning switch (Brake master cylinder reservoir sub-assembly)
Harness or connector
Skid control ECU (Master cylinder solenoid)
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| C1454 | The fluid level of the reservoir is below the LOW level for 40 seconds after the ignition switch is turned to ON, or for 7 seconds during pump motor operation. |
WIRING DIAGRAM
INSPECTION PROCEDURE
- After replacing the master cylinder solenoid, perform zero point calibration ().
| 1.CHECK BRAKE FLUID LEVEL |
Turn the ignition switch off.
Depress the brake pedal 40 times or more (until the pedal reaction feels light and pedal stroke becomes longer).
Check the amount of fluid in the brake reservoir.
- When the ignition switch is turned to ON, brake fluid is sent to the accumulator and the fluid level decreases by approximately 5 mm (0.197 in.) from the level when the ignition switch is off (normal).
- OK:
- Brake fluid level is normal.
| | CHECK AND REPAIR BRAKE FLUID LEAK |
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| 2.INSPECT BRAKE FLUID LEVEL WARNING SWITCH |
Disconnect the A26 brake fluid level warning switch (brake master cylinder reservoir sub-assembly) connector.
Measure the resistance according to the value(s) in the table below.
- A float is placed inside the reservoir. Its position can be changed by increasing/decreasing the level of brake fluid.
- Standard Resistance:
| Tester Connection | Switch Condition | Specified Condition |
| 1 (GND) - 2 (LBL) | Float UP (Switch off) | 1.9 to 2.1 kΩ |
| Float DOWN (Switch on) | Below 1 Ω |
Text in Illustration| *a | Component without harness connected
(Brake Fluid Level Warning Switch [Brake Master Cylinder Reservoir Sub-assembly]) |
- If there is no problem after finishing the above check, adjust the brake fluid level to the MAX level.
Result| Result | Proceed to |
| OK | A |
| NG (for LHD) | B |
| NG (for RHD) | C |
| | REPLACE BRAKE MASTER CYLINDER RESERVOIR SUB-ASSEMBLY ()
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| | REPLACE BRAKE MASTER CYLINDER RESERVOIR SUB-ASSEMBLY ()
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| 3.CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - BRAKE FLUID LEVEL WARNING SWITCH) |
Disconnect the A24 skid control ECU (master cylinder solenoid) connector.
Disconnect the A26 brake fluid level warning switch (brake master cylinder reservoir sub-assembly) connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
| Tester Connection | Condition | Specified Condition |
| A24-41 (LBL) - A26-2 (LBL) | Always | Below 1 Ω |
| A24-41 (LBL) - Body ground | Always | 10 kΩ or higher |
| A26-1 (GND) - Body ground | Always | Below 1 Ω |
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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Turn the ignition switch off.
Start the engine and idle it for approximately 40 seconds.
Check if the same DTC is output ().
Result| Result | Proceed to |
| DTC is not output | A |
| DTC is output (for LHD) | B |
| DTC is output (for RHD) | C |
| | REPLACE MASTER CYLINDER SOLENOID ()
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| | REPLACE MASTER CYLINDER SOLENOID ()
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| A | |
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| CHECK FOR INTERMITTENT PROBLEMS ()
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