B1667 — Mirror Driver Up/Down Motor Stalled
**Overview**
The diagnostic trouble code B1667 indicates an issue related to the **driver’s side side mirror motor**, specifically that the **up/down movement function** has experienced a stall or failure. This code typically appears when the vehicle’s **Engine Control Unit (ECU)** detects that the motor dedicated to adjusting the mirror’s vertical position is **not responding correctly** or is **stalled during operation**.
It’s important to note that **label terminology can vary between vehicle manufacturers**, and the exact wording of the code may differ slightly depending on the OEM (Original Equipment Manufacturer) system used.
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**Fast Facts**
- System affected: Body Control Module / Mirror Adjustment System
- Severity: Moderate
- Main symptoms: Mirror adjustment failure, warning light or message (if equipped)
- Driveability: No
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**Manufacturer variations for trouble code B1667**
Many vehicle manufacturers assign different labels or codes for mirror motor issues. The variation in coding reflects different system architectures and diagnostic protocols.
**Known label variations include:**
- Volkswagen / Audi: Second Mirror Motor Control Circuit Failure
- BMW: Mirror Up/Down Motor Stalled
- Mercedes-Benz: Driver Side Mirror Vertical Adjustment Motor Fault
- Ford: Power Mirror Motor Stalled or Circuit Malfunction
- Toyota / Lexus: Driver Side Mirror Vertical Motor Error
Note that while the code B1667 is typical in generic OBD-II frameworks, specific OEMs may assign different specific codes or supplementary fault identifiers.
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**What does trouble code B1667 mean?**
The **ECU continuously monitors** the **electrical circuit** and **motor behaviour** of the driver side mirror’s **vertical adjustment function** (up and down movement). When the system detects **an abnormality**—such as a **stall, lack of response, or electrical fault**—it triggers the fault code B1667.
**This code is typically set** when the **mirror motor**:
– Fails to respond during operation
– Stops moving mid-cycle due to an electrical fault
– Draws excessive current indicating possible mechanical obstructions or motor damage
– Experiences a **disconnection** or **short circuit**
**Situations where this code might appear** include:
– After recent repairs or mirror replacement
– During cold weather, affecting electrical components
– Due to wiring issues or connector corrosion
– If the mirror motor has worn out or failed
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**Severity and risks of trouble code B1667**
The presence of B1667 generally signals that **the vertical adjustment function of the driver’s side mirror** is **not operational**.
**Potential risks include:**
– Reduced visibility, especially in situations requiring quick mirror adjustments
– Potential safety concerns if the driver cannot adjust the mirror properly
– Electrical issues possibly indicating wiring or circuit faults that could affect other systems
**However**, this fault **does not** typically affect the vehicle’s ability to operate normally or drive.
**Conclusion:** Limited — the vehicle can usually still be driven, but the mirror adjustment feature is inoperative until repaired.
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**Symptoms of trouble code B1667**
Common symptoms include:
– **Inoperative vertical adjustment** of the driver side mirror via switch or control
– **Warning light or message** related to mirror adjustment (if equipped)
– **Stuck mirror in a fixed position**, often at the last setting
– **No movement response** despite pressing the mirror switch
– Potential **audible clicking** or **electrical noises** from the mirror assembly
**Note:** If the mirror motor has physically failed, the adjustment won’t respond regardless of the control input.
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**Most likely causes of trouble code B1667**
**In the diagnostic process**, several causes are typically explored. The causes are listed from most common to less frequent:
1. **Faulty or burned-out mirror motor** – The motor itself has failed internally or has suffered mechanical damage.
2. **Electrical circuit issue** – Open circuit, short circuit, or blown fuse affecting the mirror’s motor wiring.
3. **Wiring or connector problem** – Corrosion, loose, or damaged wiring harness connections between the ECU and the mirror motor.
4. **Faulty mirror switch or control module** – The switch or control unit may have an internal fault, preventing proper command transmission.
5. **Software or calibration error** – Less common, but sometimes a system update or re-calibration is needed.
6. **Mechanical obstructions or binding** – Physical obstacles preventing the mirror from moving, causing the motor to stall.
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**How to diagnose trouble code B1667**
**A systematic approach ensures accurate diagnosis** while minimizing unnecessary parts replacement:
1. **Visual Inspection**
Check wiring harnesses, connectors, and the mirror assembly for visible damage, corrosion, or loose connections.
2. **Test Circuit Power and Ground**
Using a multimeter, verify that the mirror motor receives proper voltage and ground signals during switch operation.
3. **Live Data Monitoring**
Connect a diagnostic scan tool and observe the mirror control parameters to see if commands are being sent and the system’s response.
4. **Check for Short or Open Circuits**
Perform continuity tests on wiring harnesses to verify integrity, and check for shorts to ground or power.
5. **Inspect and Test the Mirror Motor**
If accessible, remove the mirror assembly and test the motor directly with a suitable power source to confirm functionality.
6. **Verify the Control Switch and Module**
Test the operation of the mirror switch and, if applicable, any related body control modules or programming.
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**Possible repairs for trouble code B1667**
**The repair strategies depend on the identified root cause**:
– **Replace the mirror motor** – A basic repair requiring removal of the mirror assembly, performed by a professional or skilled technician.
– **Repair or replace wiring harnesses or connectors** – Addressing corrosion, damaged wires, or loose connections, typically a DIY task but best done by professionals.
– **Replace the switch or control module** – When fault is isolated to switches or control units, these components are swapped out.
– **Reset or reprogram the system** – In case of software glitches, a vehicle-specific diagnostic tool may be needed.
– **Address mechanical obstructions** – Clear any physical damage or obstacles preventing mirror movement.
**Note:** Some repairs involve **deep disassembly** or **electrical testing**, so professional diagnosis is recommended for complex cases.
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**Vehicles commonly associated with trouble code B1667 in Europe**
**This code can affect a wide variety of vehicles**, especially those equipped with electric mirrors. In Europe, common vehicle brands with reports of this code include:
– **Volkswagen Group** (Volkswagen, Audi, Škoda, SEAT): Many models with electric mirror functions.
– **BMW**: Various series, particularly those featuring electric side mirrors.
– **Mercedes-Benz**: Models with electronically controlled mirrors.
– **Ford**: Certain models with power mirrors.
– **Toyota / Lexus**: Specific models with electronic mirror adjustment.
The prevalence of this issue depends heavily on the **vehicle’s age**, **wiring quality**, and **frequency of use**.
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**Frequent mistakes & best practices**
**Diagnosing and repairing B1667 requires careful attention** to detail. Common mistakes include:
– **Replacing the mirror motor without confirming the circuit problem** – risk of unnecessary part replacement.
– **Ignoring wiring or connector issues** – neglecting electrical integrity often leads to recurring faults.
– **Using generic or incompatible parts** – recharging the system with OEM parts ensures durability.
– **Skipping live data checks** – assumptions without actual electrical testing can mislead diagnostics.
– **Failing to reset the system after repairs** – some systems require reinitialization or calibration post-repair.
**Best practices** involve thorough visual inspections, precise electrical testing, and adhering to manufacturer repair procedures.
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**Quick FAQ — trouble code B1667**
**Can this code disappear on its own?**
Typically, no. Unless the underlying cause resolves itself (e.g., loose connector re-establishes contact), the code will persist until repairs are performed.
**Can I keep driving?**
While the **vehicle is generally drivable**, the **driver side mirror’s vertical adjustment will be inoperative**. For safety reasons, repairs are recommended promptly.
**Why does the code return after clearing it?**
If the root cause (like a faulty motor or wiring fault) remains unresolved, the system will **detect the fault again** and re-trigger the code. Proper diagnosis and repairs are essential to prevent recurrence.
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**Conclusion**
The diagnosis and repair of B1667 require an organized approach grounded in electrical understanding and manufacturer-specific procedures. By following systematic diagnostic steps, identifying the root cause, and executing proper repairs, technicians and informed vehicle owners can restore full functionality to the driver side mirror and maintain vehicle operation safety.