DTC C1453: Reservoir Level Switch Disconnected; DTC C1454: Reservoir Level Low [08/2015 - ]: Procedure

1. Turn the ignition switch off.
2. Depress the brake pedal 40 times or more (until the pedal reaction feels light and pedal stroke becomes longer).
3. Check the amount of fluid in the brake reservoir.

   HINT: 

   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.

Result: 

NG 

CHECK AND REPAIR BRAKE FLUID LEAKAGE 

Result: 

OK 

See step  2

1. Disconnect the A8 brake fluid level warning switch connector.
2. Measure the resistance according to the value(s) in the table below.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   HINT: 

   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)

   HINT: 

   If there is no problem after finishing the above check, adjust the brake fluid level to the MAX level.

Result: 

NG 

REPLACE BRAKE MASTER CYLINDER RESERVOIR ASSEMBLY 

(Refer to DISASSEMBLY [08/2015 - ] )

Result: 

OK 

See step  3

1. Disconnect the A6 skid control ECU connector.
2. Disconnect the A8 brake fluid level warning switch connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   A6-41 (LBL) - A8-2 (LBL)	Always	Below 1 Ω
   A6-41 (LBL) - Body ground	Always	10 kΩ or higher
   A8-1 (GND) - Body ground	Always	Below 1 Ω

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  4

1. Clear the DTCs (Refer to DTC CHECK / CLEAR [08/2015 - 08/2019] , or refer to DTC CHECK / CLEAR [08/2019 - ] ).
2. Turn the ignition switch off.
3. Start the engine and idle it for approximately 40 seconds.
4. Check if the same DTCs are output.
   RESULT
   
   

   Result	Proceed to
   DTC is output	A
   DTC is not output	B

Result: 

A 

REPLACE MASTER CYLINDER SOLENOID 

(Refer to DISASSEMBLY [08/2015 - ] )

Result: 

B 

USE SIMULATION METHOD TO CHECK 

(Refer to HOW TO PROCEED WITH TROUBLESHOOTING [08/2015 - 08/2019] , or refer to HOW TO PROCEED WITH TROUBLESHOOTING [08/2019 - ] )