B1670 — Mirror Passenger Right/Left Motor Stalled

The diagnostic trouble code B1670 indicates a malfunction related to the power mirror motor on either the passenger right or left side of the vehicle. Essentially, this code flags a problem with the motor responsible for adjusting or folding the side mirror electronically. It’s important to note that code labels may vary between different vehicle manufacturers (OEMs)—some may use a slightly different code or terminology for similar issues.

  • System affected: Exterior mirror control system
  • Severity: Moderate
  • Main symptoms: Mirror not moving, unresponsive mirror adjustment
  • Driveability: Limited — primarily affects mirror function, not driving capabilities

—

Manufacturer variations for trouble code B1670

Different vehicle manufacturers might assign variations or different labels to this particular fault, although the core issue remains similar. Some manufacturers might code it differently depending on their diagnostic standards and vehicle architecture. Here are some known label variations:

  • Volkswagen / Audi: 005169
  • Ford: B1670 (or similar code in OBD-II)
  • Mercedes-Benz: 1660, 399
  • BMW: 939F, 98BA
  • Toyota / Lexus: Typically use generic codes, but might reference mirror motor faults indirectly

—

What does trouble code B1670 mean?

B1670 is a diagnostic code that indicates an issue with the power mirror motor. The Electronic Control Unit (ECU)—the vehicle’s central computer that manages many electronic functions—monitors the operation of the mirror motors through sensors and signals. Specifically, it detects when the motor fails to respond as expected during an adjustment command.

This code is usually triggered when the ECU receives a no response or erroneous signal from the mirror motor circuit. It often occurs during attempts to adjust or fold mirrors electronically, or when a malfunction is detected in the motor’s circuit.

Typically, this code appears in the context of electronic mirror adjustment issues. It can be caused by failed motors, wiring problems, or faulty control modules. It’s mostly a problem affecting the convenience features rather than core vehicle functions, but ignoring it could lead to further electrical issues.

—

Severity and risks of trouble code B1670

The **severity** of B1670 is generally considered **moderate** because it primarily impacts the adjustment and folding of the side mirrors. While it does not directly affect vehicle safety or drivability, having non-functional mirrors can hinder visibility, especially if you rely on electronic folding or adjusting features.

Potential **risks** include incomplete visibility, inability to fold mirrors for parking, or difficulty in certain driving situations. If the issue is caused by wiring damage or a failing motor that could short circuit, there is a risk of further electrical damage, which might impact other systems over time.

In most cases, Yes, the vehicle can still be driven, but it’s advisable to address the problem promptly to restore full function and ensure clear visibility.

—

Symptoms of trouble code B1670

When B1670 sets, you might notice several symptoms that alert you to an issue with your side mirror operation. While some vehicles may not display all symptoms, common signs include:

  • Non-responsive side mirrors when attempting to adjust electronically
  • Mirror folding not working when using the electric switch or key fob
  • Unusual noises from the mirror motor area during adjustment attempts
  • Warning lights or messages on the dashboard related to mirror functions
  • Inconsistent mirror position – mirrors may move erratically or not at all

Most likely causes of trouble code B1670

Understanding the root causes of B1670 is fundamental for effective diagnosis and repair. Below is an outlined list of the most probable causes, ordered from the most typical to less common:

  1. Faulty mirror motor: The motor itself may have failed due to wear, electrical issues, or manufacturing defects.
  2. Wiring or connector problems: Damaged, loose, or corroded wiring connections linking the mirror motor to the vehicle’s electrical system.
  3. Blown fuse or relay: A blown fuse protecting the mirror circuit can interrupt power supply to the motor.
  4. Faulty switch or control module: The switch used to operate the mirrors or the module controlling mirror functions could be malfunctioning.
  5. Body control module or ECU malfunction: In rare cases, the vehicle’s central electronic control can have issues interpreting or managing mirror commands.

—

How to diagnose trouble code B1670

Diagnosing B1670 involves a systematic approach to pinpoint the faulty component or circuit. Here are general, non-manufacturer-specific diagnostic steps:

  1. Visual inspection: Check the physical condition of the mirrors, wiring, and connectors for damage, corrosion, or disconnection.
  2. Check fuses and relays: Verify the relevant fuse and relay related to the mirror power circuit are intact and functioning.
  3. Test mirror operation: Use the vehicle’s control switch to attempt mirror adjustment and observe any movement or lack thereof.
  4. Scan live data: Use a diagnostic scan tool to monitor the mirror motor signals and verify if the ECU is sending adjustment commands.
  5. Electrical testing: Measure voltage and continuity in wiring harnesses connected to the mirror motor. Use a multimeter for these checks.
  6. Inspect the mirror motor: If accessible, test the motor directly by applying power to see if it spins freely and responds correctly.

Possible repairs for trouble code B1670

The appropriate fix depends on the identified cause, but here are common repair actions:

  • Replace the mirror motor: If the motor is faulty, a professional should install a new OEM-quality motor to ensure proper operation.
  • Repair or replace wiring and connectors: Damaged wiring or corroded connectors should be repaired or replaced by a qualified technician.
  • Reset or replace fuses/relays: If a fuse or relay is blown, replacing it with the correct OEM part is essential.
  • Replace control switch or module: Faulty switch assemblies or control modules must be replaced and coded accordingly.
  • ECU reprogramming or replacement: Only in rare cases, a malfunctioning ECU module might require reprogramming or replacement by a professional specialist.

Vehicles commonly associated with trouble code B1670 in Europe

This fault can affect multiple vehicle makes, especially those with electronic mirrors. Commonly, the following brands are affected:

Volkswagen Group (Volkswagen, Audi, Skoda, SEAT): and their engine families often report mirror motor issues under various codes.

Other European brands with similar electronic systems may also encounter this fault, but detailed data on specific models or engine types is limited and should be verified on a case-by-case basis.

Frequent mistakes with trouble code B1670

During diagnostics or repairs, certain mistakes can lead to misdiagnosis or incomplete repairs. To ensure best practices, avoid:

  • Ignoring intermittent symptoms or verifying visually only, without testing electrical components.
  • Replacing parts without proper testing—such as installing a new mirror motor without confirming the wiring or control signal issues first.
  • Failing to check related fuses and relays, which are common culprits for circuit interruption.
  • Forcing the mirror adjustment switch, risking further damage rather than diagnosing the real fault.
  • Using non-OEM parts or incompatible replacements, which can lead to further electrical issues or compatibility problems.

FAQ — trouble code B1670

Can this code disappear on its own?

Generally, no. B1670 persists until the underlying mechanical or electrical issue is diagnosed and repaired. However, some temporary glitches may clear themselves but are likely to recur.

Can I keep driving?

Yes, typically you can continue driving as long as your mirrors function properly and pose no safety risk. However, it’s advised to have the issue checked promptly to restore full mirror operation.

Why does the code return after clearing?

If the underlying problem—such as wiring damage, a failed motor, or a faulty switch—is not fixed, the code is likely to reappear after being cleared. Proper diagnosis and repair are essential.

Retour en haut