The B1773 code, often associated with various vehicle makes and models, indicates a problem within the mirror adjustment system, specifically the "driver up" circuit. This failure can prevent the driver's side mirror from moving upwards, affecting visibility and potentially creating a safety hazard. Diagnosing and addressing the B1773 code promptly is crucial for restoring full functionality and ensuring safe driving.
Comprehensive Table: B1773 Mirror Driver Up Circuit Failure
| Component/Area | Description | Possible Causes |
|---|---|---|
| Mirror Adjustment Motor (Driver's Side) | The electric motor responsible for moving the driver's side mirror upwards. | Faulty Motor: Worn brushes, internal short, or complete motor failure. Mechanical Binding: Obstruction preventing free movement of the mirror. |
| Mirror Switch Assembly | The switch on the door panel that controls the mirror adjustments. | Faulty Switch: Contact corrosion, internal damage, or wiring issues. Loose Connection: Connector unplugged or damaged wiring to the switch. |
| Wiring Harness & Connectors | The wires and connectors that carry power and signals between the switch, control module, and mirror motor. | Damaged Wiring: Broken, frayed, or corroded wires. Loose or Corroded Connectors: Poor electrical contact due to dirt, moisture, or damage. Short to Ground: Wiring insulation damaged, causing a short circuit. |
| Body Control Module (BCM) / Driver Door Module (DDM) | The computer module that controls various electrical functions in the vehicle, including mirror adjustments. | Software Glitch: Temporary malfunction requiring a reset. Internal Fault: Damage to the module's internal circuitry. Communication Error: Failure to communicate with other modules on the vehicle's network. |
| Power Supply & Ground | The power and ground circuits that provide electricity to the mirror adjustment system. | Low Voltage: Insufficient voltage reaching the mirror motor. Poor Ground Connection: Inadequate ground connection affecting circuit performance. |
| Fuse | A protective device that prevents excessive current flow from damaging the circuit. | Blown Fuse: Overload in the mirror circuit, causing the fuse to blow. Incorrect Fuse Rating: Using a fuse with a lower amperage rating than specified. |
| Diagnostic Trouble Code (DTC) Clearing | The process of erasing the B1773 code from the vehicle's computer after the fault has been repaired. | Failure to Clear DTC: The fault has not been properly repaired, or the diagnostic tool is not compatible. |
| Affected Vehicle Systems | Systems that are impacted by the mirror functionality failure. | Reduced Visibility: Impaired view of surroundings, especially during lane changes and parking. Safety Hazard: Increased risk of accidents due to limited visibility. |
| Symptoms | Observable issues caused by the B1773 code. | Mirror Fails to Move Up: The primary symptom, indicating a problem with the "up" circuit. Intermittent Operation: Mirror works sometimes, but not consistently. No Mirror Adjustment: Complete failure of all mirror adjustment functions. |
| Common Tools for Diagnosis | Equipment used to identify the root cause of the B1773 code. | Multimeter: Used to test voltage, continuity, and resistance in the circuit. Scan Tool: Used to read and clear diagnostic trouble codes. Wiring Diagram: Used to trace the wiring and identify potential faults. |
Detailed Explanations:
Mirror Adjustment Motor (Driver's Side): This is the electric motor specifically responsible for moving the driver's side mirror upwards. It's a small but crucial component in the mirror adjustment system. A failing motor is a common cause of the B1773 code.
Mirror Switch Assembly: The mirror switch assembly is located on the driver's side door panel and contains the buttons or controls used to adjust the mirrors. It sends signals to the BCM/DDM to activate the mirror motors. A faulty switch can disrupt the signals sent to the mirror motor.
Wiring Harness & Connectors: The wiring harness is a bundle of wires that connects all the components of the mirror adjustment system. Connectors are used to join the wires together. Damaged wiring or corroded connectors can interrupt the flow of electricity, causing the B1773 code.
Body Control Module (BCM) / Driver Door Module (DDM): The BCM/DDM is a computer module that controls various electrical functions in the vehicle, including the mirror adjustments. It receives signals from the mirror switch and sends commands to the mirror motors. Internal faults or software glitches can cause the BCM/DDM to malfunction.
Power Supply & Ground: The mirror adjustment system requires a stable power supply and a good ground connection to operate correctly. Low voltage or a poor ground connection can prevent the mirror motor from working properly. The ground connection is a crucial return path for the electrical current.
Fuse: The fuse is a safety device that protects the mirror circuit from overcurrent. A blown fuse indicates that there is an overload in the circuit, which could be caused by a short circuit or a faulty component. Replacing a blown fuse without addressing the underlying cause will likely result in the fuse blowing again.
Diagnostic Trouble Code (DTC) Clearing: After repairing the fault that caused the B1773 code, it's necessary to clear the code from the vehicle's computer. This is done using a scan tool. If the code is not cleared, it may reappear even after the repair is completed.
Affected Vehicle Systems: The primary system affected by the B1773 code is the mirror adjustment system. However, the mirror adjustment system is related to the driver's ability to see their surroundings so the safety of the vehicle is affected.
Symptoms: The most obvious symptom of the B1773 code is that the driver's side mirror fails to move upwards. Other symptoms may include intermittent operation or complete failure of all mirror adjustment functions.
Common Tools for Diagnosis: Diagnosing the B1773 code requires the use of several tools, including a multimeter, a scan tool, and a wiring diagram. The multimeter is used to test voltage, continuity, and resistance in the circuit. The scan tool is used to read and clear diagnostic trouble codes. The wiring diagram is used to trace the wiring and identify potential faults.
Frequently Asked Questions:
What does the B1773 code mean? The B1773 code indicates a problem with the "driver up" circuit in the mirror adjustment system, meaning the driver's side mirror is not moving upwards. This usually points to a fault in the motor, wiring, or control module.
How serious is the B1773 code? While the car is still operational, the B1773 code can cause a safety hazard by limiting visibility. Addressing the issue promptly is recommended.
Can I fix the B1773 code myself? Depending on your mechanical skills and access to diagnostic tools, you may be able to diagnose and repair the problem yourself. However, it's important to be cautious when working with electrical systems. If you're not comfortable, it's best to take the vehicle to a qualified mechanic.
What are the common causes of the B1773 code? Common causes include a faulty mirror adjustment motor, damaged wiring, a faulty switch, or a problem with the BCM/DDM. A blown fuse can also trigger the code.
How do I clear the B1773 code? You'll need a scan tool to clear the B1773 code. Connect the scan tool to the vehicle's OBD-II port and follow the instructions to clear the code after the fault has been repaired.
How much does it cost to fix the B1773 code? The cost to fix the B1773 code can vary depending on the cause of the problem and the labor rates in your area. Replacing a faulty motor or switch can range from $100 to $300, while diagnosing and repairing wiring issues can be more expensive. Module replacement can be even more costly.
Conclusion:
The B1773 code signifies a problem in the mirror driver up circuit, often resulting in the driver's side mirror failing to adjust upwards. Proper diagnosis using tools like multimeters and scan tools, followed by targeted repairs to components such as the mirror motor, switch, or wiring, is essential to resolve the issue and restore full mirror functionality.