AutoCodes – Toyota – C1903 Toyota

C1903 Toyota 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 Toyota 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.

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Code Popularity 820

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Dec 03, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code C1903 Toyota Description

The Rear Active Stabilizer Control Actuator consists of the rotation angle sensor, relay, motor and other parts. If a problem related to the rotation angle sensor or actuator drive function of the rear active stabilizer control actuator or rear active stabilizer control ECU occurs.

OBDII Code C1903 Toyota - Rear Actuator Short Detect Relay - AutoCodes.com — C1903 Toyota Code - Rear Actuator Short Detect Relay

What does this mean?

What are the Possible Causes of the DTC C1903 Toyota?

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 Toyota?

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 Toyota 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.

Need more information about the C1903 Toyota code?

Need more information on how to fix the C1903 Toyota code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the C1903 Toyota code diagnosed by a professional: Find a repair shop in your area

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about C1903 Toyota Code

1. What are the common symptoms of OBDII code C1903 Toyota (Rear Actuator Short Detect Relay)?

The common symptoms include the ABS warning light staying on, potential loss of ABS functionality, and difficulty engaging the rear actuator.

2. What can cause the OBDII code C1903 Toyota to trigger?

The code C1903 Toyota is typically triggered by a short circuit in the rear actuator short detect relay circuit.

3. How can I diagnose the issue related to code C1903 Toyota?

Diagnosing the issue requires using a diagnostic scanner to retrieve the trouble codes, inspecting the wiring and connectors for any visible damage, and testing the rear actuator short detect relay for proper functionality.

4. Is it safe to drive with the OBDII code C1903 Toyota active?

It is not recommended to drive with the code C1903 Toyota active, as it may lead to the loss of ABS functionality, potentially compromising the vehicle's safety.

5. Can I reset the OBDII code C1903 Toyota without fixing the underlying issue?

Resetting the code without addressing the root cause will only temporarily clear the error code. The issue will likely reoccur until the underlying problem is resolved.

6. How do I repair the OBDII code C1903 Toyota related to the Rear Actuator Short Detect Relay?

Repairing the code C1903 Toyota involves locating and repairing the short circuit in the rear actuator short detect relay circuit, replacing any damaged wiring or connectors, and ensuring proper electrical connections.

7. Can a DIY enthusiast fix the OBDII code C1903 Toyota issue?

While some DIY enthusiasts may be able to diagnose and repair the code C1903 Toyota, it is recommended to seek professional help, especially when dealing with complex electrical systems like the ABS.

8. Are there any preventive maintenance tips to avoid OBDII code C1903 Toyota?

Regularly inspecting the ABS system, checking for any signs of wear or damage in the wiring, and addressing any issues promptly can help prevent the occurrence of the OBDII code C1903 Toyota.

9. How long does it take to repair the OBDII code C1903 Toyota issue?

The repair time for the code C1903 Toyota can vary depending on the extent of the damage and the expertise of the technician. It may take a few hours to a full day to diagnose and repair the issue.

10. What happens if the OBDII code C1903 Toyota is left unresolved?

If left unresolved, the code C1903 Toyota can lead to continued ABS malfunctions, potentially compromising the vehicle's braking system and overall safety. It is essential to address the issue promptly.