C1903 Lexus Code - Rear Actuator Short Detect Relay
Quick Answer
The Rear Active Stabilizer Control Actuator consists of the rotation angle sensor, relay, motor and other parts. Common causes include Faulty Rear Active Stabilizer Control Actuator, Rear Active Stabilizer Control Actuator harness is open or shorted, Rear Active Stabilizer Control Actuator circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- C1903 Lexus indicates Rear Actuator Short Detect Relay.
- Common causes
- Common causes include Faulty Rear Active Stabilizer Control Actuator, Rear Active Stabilizer Control Actuator harness is open or shorted, Rear Active Stabilizer Control Actuator circuit poor electrical connection.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Code C1903 Lexus Description
What are the Possible Causes of the DTC C1903 Lexus?
- Faulty Rear Active Stabilizer Control Actuator
- Rear Active Stabilizer Control Actuator harness is open or shorted
- Rear Active Stabilizer Control Actuator circuit poor electrical connection
- Faulty Rear Active Stabilizer Control ECU
How to Fix the DTC C1903 Lexus?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the C1903 Lexus code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Frequently Asked Questions about C1903 Lexus Code
1. What does the OBDII code C1903 mean on a Lexus?
C1903 indicates a "Rear Actuator Short Detect Relay" issue, meaning there is a short circuit detected in the rear suspension actuator relay or its associated wiring.
2. What are common symptoms of the C1903 code in a Lexus?
Common symptoms include a warning light on the dashboard, issues with the suspension height adjustment, or the suspension feeling stiff or unresponsive.
3. What causes the C1903 code to appear in a Lexus?
The primary causes are damaged wiring, a faulty rear actuator relay, corroded electrical connections, or a malfunctioning rear suspension actuator.
4. Can I drive my Lexus with the C1903 code?
While the vehicle may still be drivable, it’s not recommended as the suspension system may not function properly, potentially affecting ride comfort and handling.
5. How do I diagnose the C1903 code on my Lexus?
Diagnose by inspecting the rear actuator relay, checking for damaged wiring or connectors, and using a multimeter to test for shorts in the circuit.
6. What repairs are needed to fix the C1903 code on a Lexus?
Repairs may include replacing the rear actuator relay, repairing or replacing damaged wiring, or cleaning corroded connectors.
7. How much does it cost to fix the C1903 code on a Lexus?
Repair costs can vary depending on the issue but typically range from $100 to $500, with higher costs if parts like the actuator need replacement.
8. Can a faulty rear actuator cause other issues in my Lexus?
Yes, a faulty rear actuator can lead to uneven suspension height, reduced ride quality, and potential wear on other suspension components.
9. Will clearing the C1903 code fix the problem in my Lexus?
Clearing the code without addressing the underlying issue will only temporarily remove the code, and it is likely to return.
10. Do I need a professional to fix the C1903 code in my Lexus?
While minor issues like wiring repairs can be done by experienced DIYers, it’s recommended to consult a professional for proper diagnosis and repair.
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