Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSLEXUS2004GS 300REPAIR AND DIAGNOSIS (SINGLE PAGE)BRAKESTRACTION CONTROLABS WITH HYDRAULIC BRAKE BOOSTER POWER SUPPLY SYSTEM - DIAGNOSTICS
2004 Lexus GS 300
Abs With Hydraulic Brake Booster Power Supply System - Diagnostics
2004 Lexus GS 300SECTION Abs With Hydraulic Brake Booster Power Supply System - Diagnostics
- How To Proceed With Troubleshooting
- Customer Problem Analysis Check
- Pre-Check
- Diagnostic Trouble Code Chart
- Parts Location
- Terminals Of Ecu
- Problem Symptoms Table
- Circuit Inspection
- DTC C0200/31, C0205/32, C0210/33, C0215/34: Speed Sensor Circuit
- DTC C0226/21, C0236/22, C0246/23, C0256/24: ABS Solenoid Circuit
- DTC C0278/11, C0279/12: ABS Solenoid Relay Circuit
- DTC C1225/25, C1226/26, C1227/27, C1228/28: TRAC & VSC Solenoid Circuit
- DTC C1241/41: IG Power Source Circuit
- DTC C1242/42: IG2 Power Source Circuit
- DTC C1243/43, C1245/45: Malfunction in Deceleration Sensor
- DTC C1244/44: Deceleration Sensor Circuit
- DTC C1246/46: Master Cylinder Pressure Sensor Circuit
- DTC C1249/49: Stop Light Switch Circuit
- DTC C1251/51: Hydraulic Brake Booster Pump Motor Malfunction
- DTC C1252/52: Hydraulic brake booster Pump Motor ON Time Abnormally Long
- DTC C1253/53: Motor Relay Circuit
- DTC C1254/54: Pressure Switch Circuit
- DTC C1256/56: Accumulator Low Pressure Malfunction
- DTC C1257/57: Power Supply Drive Circuit
- Diagnostic Trouble Codes Always ON Malfunction in ECU
- ABS Warning Light Circuit
- BRAKE Warning Light Circuit
- BRAKE Warning Buzzer Circuit
- Tc Terminal Circuit
- Ts Terminal Circuit
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.