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AutoCodes – Saturn – B3949 Saturn

B3949 Saturn Code - Right Front Turn Signal Circuit

Quick Answer

Ground is applied at all times to the turn signal/multifunction switch. Common causes include Faulty Right Front Turn Signal Lamp, Right Front Turn Signal Lamp harness is open or shorted, Right Front Turn Signal Lamp 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
B3949 Saturn indicates Right Front Turn Signal Circuit.
Common causes
Common causes include Faulty Right Front Turn Signal Lamp, Right Front Turn Signal Lamp harness is open or shorted, Right Front Turn Signal Lamp 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 572
How popular is this code, among other codes? Low
What is this?
Table of contents Created and updated by William Orellana on Jun 17, 2023
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Code B3949 Saturn Description

Ground is applied at all times to the turn signal/multifunction switch. The turn signal lamps may only be activated with the ignition switch in the ON or START positions. When the turn signal/multifunction switch is placed in either the TURN RIGHT or TURN LEFT position, ground is applied to the Body Control Module (BCM) through either the right turn or left turn signal switch signal circuit. The BCM responds to the turn signal switch input by applying a pulsating voltage to the front and rear turn signal lamps through there respective control circuits. When a turn signal request is received by the BCM, a serial data message is sent to the instrument cluster requesting the respective turn signal indicator be pulsed ON and OFF. The Diagnostic Trouble Code (DTC) will be set when the BCM detects an open/high resistance in the left front turn signal control circuit.
OBDII Code B3949 Saturn - Right Front Turn Signal Circuit - AutoCodes.com
B3949 Saturn Code - Right Front Turn Signal Circuit
What does this mean?

What are the Possible Causes of the DTC B3949 Saturn?

  • Faulty Right Front Turn Signal Lamp
  • Right Front Turn Signal Lamp harness is open or shorted
  • Right Front Turn Signal Lamp circuit poor electrical connection
  • Faulty Body Control Module (BCM)

How to Fix the DTC B3949 Saturn?

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 B3949 Saturn 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 B3949 Saturn code?

Need more information on how to fix the B3949 Saturn code? Get Access to Factory Service Manuals

Need Help with the Code?

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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 B3949 Saturn Code

1. What does the OBDII code B3949 mean on a Saturn?

The B3949 code indicates an issue with the right front turn signal circuit, such as a malfunction, open circuit, or short.

2. What are the common symptoms of the B3949 code?

Symptoms include the right front turn signal not working, rapid flashing of the turn signal indicator, or the turn signal indicator staying on solid.

3. What causes the B3949 code on a Saturn?

Common causes include a burned-out turn signal bulb, damaged wiring or connectors, a faulty turn signal socket, or a malfunctioning body control module (BCM).

4. How can I diagnose the B3949 code?

Diagnose by visually inspecting the turn signal bulb, socket, and wiring for damage. Use a multimeter to check for continuity and voltage in the circuit.

5. Can a blown bulb trigger the B3949 code?

Yes, a blown or faulty right front turn signal bulb is a common cause of this code.

6. How do I fix the B3949 code on my Saturn?

Replace the right front turn signal bulb if it is burned out, repair or replace damaged wiring, and ensure the socket is clean and making good contact.

7. Is it safe to drive with the B3949 code?

It’s generally not safe to drive with a non-functioning turn signal as it can create a safety hazard and may be illegal in some areas.

8. Can a faulty body control module (BCM) cause the B3949 code?

Yes, but it’s less common. The BCM may need to be inspected or replaced if all other components are functioning correctly.

9. How much does it cost to repair the B3949 code?

Costs vary depending on the issue, ranging from $10–$20 for a bulb replacement to $100–$300 for wiring repairs or BCM replacement.

10. Can I clear the B3949 code after repairs without a scan tool?

The code may clear itself after fixing the issue, but using a scan tool ensures it’s properly erased from the system.

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