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Home >> Lexus >> 2022 >> LS 500h AWD >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> Electronically Controlled Brake System (W/O Advanced Park) - Diagnostic Codes (2 Of 3) >> ELECTRONICALLY CONTROLLED BRAKE SYSTEM (w/o Advanced Park) >> DTC C1252: Brake Booster Pump Motor on Time Abnormally Long; DTC C1253: Pump Motor Relay [10/2020 - 10/2023] >> Component Operating Range

Component Operating Range

C0594

All of the following conditions are met -
Accumulator pressure sensor data Valid
Brake booster motor fail (C121E) Not detected
Accumulator pressure Higher than 18.74 MPa (191.1 kgf/cm2 , 2717 psi)
C121D

Brake booster motor voltage 3.5 V or more
C121E

Brake booster motor voltage Less than 3.5 V
C126C

All of the following conditions are met A, B, C and D
A. Command to brake booster motor relay 2 On
B. BS2 voltage 9.5 V or more
C. Either of the following conditions are met -
+BI1 and +BI3 voltage 7 V or more
+BI2 and +BI4 voltage 7 V or more
D. Brake booster with accumulator pump assembly voltage 3.5 V or more