The B1670 diagnostic trouble code (DTC) indicates a problem with the passenger side power mirror motor, specifically that it is stalled. This means the motor is attempting to move the mirror, but it's either not moving at all or is moving very slowly, preventing it from reaching its intended position. Addressing this issue promptly can restore full functionality to your side mirror and ensure safe driving.
This code can be frustrating, as it impacts visibility and can be a safety concern. Understanding the potential causes and troubleshooting steps is key to resolving the problem efficiently.
| Component/Area | Description | Potential Causes |
|---|---|---|
| Power Mirror Motor (Passenger Side) | The electric motor responsible for adjusting the mirror's position (up/down, left/right). | Motor Failure: The motor itself may be worn out, damaged, or internally shorted. This is a common cause. Internal Jamming: Debris, corrosion, or physical damage within the motor assembly can prevent it from rotating. * Binding: Mechanical binding within the mirror housing or the mirror adjustment mechanism. |
| Mirror Adjustment Mechanism | The gears, linkages, and pivots that translate the motor's rotation into mirror movement. | Physical Obstruction: An object (ice, debris, etc.) blocking the mirror's movement. Corrosion: Rust or corrosion seizing the adjustment mechanism. Damage: Broken or worn gears or linkages. Impact damage is a common culprit. Lack of Lubrication: Dried-out or insufficient lubrication causing friction and binding. |
| Wiring and Connectors | The electrical wiring harness and connectors that supply power and control signals to the mirror motor. | Open Circuit: A break in the wiring preventing power from reaching the motor. This can be caused by chafing, corrosion, or accidental damage. Short Circuit: A short to ground or another wire causing the motor to malfunction or blow a fuse. Loose or Corroded Connectors: Poor electrical connection at the connectors, leading to intermittent or no power. Check both the mirror connector and the connector at the door module. Damaged Wiring: Cracked, frayed, or exposed wires. Rodent damage is a possibility. |
| Door Module (Power Mirror Control) | The electronic control module that sends commands to the mirror motor. | Module Failure: The door module itself may be malfunctioning, failing to send the correct signals to the motor. This is less common than motor failure but possible. Software Glitch: In rare cases, a software glitch within the module could cause the issue. * Incorrect Programming: If the door module has been replaced or reprogrammed incorrectly, it may not control the mirrors properly. |
| Fuse(s) and Relays | Fuses and relays protect the power mirror circuit and control the flow of electricity to the motor. | Blown Fuse: A blown fuse indicating an overcurrent condition in the circuit. This is often a symptom of a short circuit. Faulty Relay: A malfunctioning relay preventing power from reaching the motor. Less common than a blown fuse. |
| Vehicle Battery and Charging System | The vehicle's battery and charging system provide the necessary power for the power mirrors to operate. | Low Battery Voltage: Insufficient battery voltage can prevent the motor from operating correctly. This is more likely during cold weather or if the battery is old. Charging System Issues: Problems with the alternator or voltage regulator can lead to voltage fluctuations that affect the power mirrors. |
| Scan Tool Data (If Available) | Diagnostic trouble code (DTC) information and live data from the vehicle's computer. | Confirmation of B1670: Verifying that the B1670 code is present. Freeze Frame Data: Reviewing the conditions present when the code was set (e.g., voltage, temperature). * Live Data: Monitoring the mirror motor's voltage and current draw while attempting to adjust the mirror. |
Detailed Explanations
Power Mirror Motor (Passenger Side): This motor is a small electric motor that drives the mechanism responsible for moving the mirror glass in different directions. It receives power and control signals from the door module. When the motor stalls, it indicates a problem preventing it from rotating freely.
Mirror Adjustment Mechanism: This is the system of gears, levers, and pivots that connects the power mirror motor to the mirror glass. It translates the motor's rotational motion into the linear movement needed to adjust the mirror's position. Any obstruction, damage, or lack of lubrication in this mechanism can cause the motor to stall.
Wiring and Connectors: The wiring and connectors form the electrical pathway that supplies power and control signals to the power mirror motor. A break in this pathway, a short circuit, or poor connections can prevent the motor from functioning properly. Carefully inspecting the wiring harness for damage and ensuring secure connections is crucial.
Door Module (Power Mirror Control): The door module is an electronic control unit that manages various functions within the door, including the power mirrors. It receives input from the mirror adjustment switch and sends the appropriate signals to the mirror motor. If the door module malfunctions, it can prevent the mirror motor from operating.
Fuse(s) and Relays: Fuses are safety devices that protect electrical circuits from overcurrent. Relays are electrically operated switches that control the flow of power to different components. A blown fuse or a faulty relay in the power mirror circuit can interrupt the power supply to the motor, causing it to stall.
Vehicle Battery and Charging System: The vehicle's battery provides the initial power for the electrical system, and the charging system (alternator) maintains the battery's charge while the engine is running. Low battery voltage or charging system problems can affect the performance of electrical components, including the power mirrors.
Scan Tool Data (If Available): A scan tool can be used to retrieve diagnostic trouble codes (DTCs) stored in the vehicle's computer. It can also provide live data, such as the mirror motor's voltage and current draw, which can help pinpoint the cause of the problem. Freeze frame data captures the conditions present when the code was set, offering valuable clues.
Frequently Asked Questions
What does the B1670 code mean? The B1670 code indicates that the passenger side power mirror motor is stalled, meaning it's not moving properly. This typically points to a problem with the motor itself, the wiring, or the control module.
How do I fix a B1670 code? Start by visually inspecting the mirror, wiring, and connectors. Check the fuse, and then consider testing the motor directly. If those components are good, you may need to test or replace the door control module.
Can I drive with a B1670 code? Yes, you can drive, but it's not recommended. A non-functional side mirror reduces visibility and poses a safety risk, so repair the issue as soon as possible.
Is a B1670 code serious? While not immediately dangerous, it is a safety concern. A functioning side mirror is essential for safe driving and lane changes.
How much does it cost to fix a B1670 code? The cost varies depending on the cause. Replacing a motor might cost between $100 and $300, while a door module could be more expensive. Diagnostic fees also apply.
What tools do I need to diagnose a B1670 code? You'll need basic tools like a multimeter, screwdrivers, and possibly a scan tool to read diagnostic codes. Wire strippers and crimpers might be necessary for wiring repairs.
Could cold weather cause a B1670 code? Yes, extremely cold temperatures can cause the mirror mechanism to bind or the motor to struggle. Ice buildup can also obstruct movement.
Is it possible to fix the mirror motor myself? Yes, with the right tools and knowledge, you can attempt to replace the motor yourself. However, professional assistance is recommended if you are not comfortable with electrical or mechanical repairs.
Conclusion
The B1670 code signals a stalled passenger side power mirror motor, often due to motor failure, wiring issues, or a faulty control module. Thorough diagnosis and systematic troubleshooting are essential to identify the root cause and restore the mirror's functionality for safe driving.