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 MANUALSLEXUS2009GS 350 RWD V6-3.5L (2GR-FSE)REPAIR AND DIAGNOSISA L L DIAGNOSTIC TROUBLE CODES ( DTC )TESTING AND INSPECTIONC CODE CHARTSC1921
2009 Lexus GS 350 RWD V6-3.5L (2GR-FSE)
C1921
2009 Lexus GS 350 RWD V6-3.5L (2GR-FSE)SECTION C1921
SUSPENSION CONTROL: ACTIVE STABILIZER SUSPENSION SYSTEM: C1908: Open in Rear Metal Board Temperature Sensor Circuit
DTC C1908 - Open in Rear Metal Board Temperature Sensor Circuit
DTC C1909 - Short in Rear Metal Board Temperature Sensor Circuit
DTC C190A - Open in Rear Control Board Temperature Sensor Circuit
DTC C190B - Short in Rear Control Board Temperature Sensor Circuit
DTC C190E - Malfunction in Rear Active Stabilizer Control ECU Magnetic Pole Sensor Power Supply IC
DTC C190F - Malfunction in Rear Active Stabilizer Control ECU Main Relay Power Supply IC
DTC C1910 - Malfunction in Rear Active Stabilizer Control ECU Battery Sensor Power Supply IC
DTC C1912 - Malfunction in Rear Active Stabilizer Control ECU Short Relay Power Supply IC
DTC C1921 - Malfunction in Rear Active Stabilizer Control ECU EEPROM
DESCRIPTION
The rear active stabilizer control ECU consists of a metal board, control board, power source IC, step-up circuit, EEPROM, and other parts. If a problem occurs in the rear active stabilizer control ECU, DTCs C1908, C1909, C190A, C190B, C190E, C190F, C1910, C1912 and C1921 are stored.
INSPECTION PROCEDURE
PROCEDURE
1. CHECK OPERATION OF REAR ACTIVE STABILIZER CONTROL ECU
(a) Turn the engine switch off.
(b) Exchange the rear active stabilizer control ECU with the front active stabilizer control ECU.
(c) Connect Techstream to the DLC3.
(d) Turn the engine switch on (IG) and press the Techstream main switch ON.
(e) Clear the DTC Active Stabilizer Suspension System.
(f) Check for DTC.
Result
A -- CHECK INTERMITTENT PROBLEMS
B -- REPLACE REAR ACTIVE STABILIZER CONTROL ECU
RENDER: 1.0x
NO RELATED
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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.