B1640 Code - Mirror Passenger Left Circuit Open
Quick Answer
The B1640 diagnostic trouble code (DTC) indicates that there is an open circuit in the mirror passenger left side of the vehicle. Common causes include Damaged wiring or connectors in the mirror passenger left circuit, Faulty mirror control switch, Defective mirror motor. 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
- B1640 indicates Mirror Passenger Left Circuit Open.
- Common causes
- Common causes include Damaged wiring or connectors in the mirror passenger left circuit, Faulty mirror control switch, Defective mirror motor.
- 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 B1640 Description
The B1640 diagnostic trouble code (DTC) indicates that there is an open circuit in the mirror passenger left side of the vehicle. This means that there is a break in the electrical connection that controls the passenger-side mirror. In modern vehicles, the mirrors are often equipped with electronic controls that allow the driver to adjust the position of the mirrors from inside the car. When the circuit is open, the electronic control unit (ECU) is unable to communicate with the mirror, resulting in the mirror being unresponsive to adjustment commands.
Common Causes of B1640
- Damaged wiring or connectors in the mirror passenger left circuit.
- Faulty mirror control switch.
- Defective mirror motor.
- Corrosion or moisture ingress in the mirror assembly.
- ECU malfunction affecting communication with the mirror.
Symptoms of B1640
- Inability to adjust the passenger-side mirror electronically.
- Mirror remains in a fixed position and cannot be moved.
- Warning light on the dashboard indicating a mirror malfunction.
- Erratic movement of the mirror when attempting to adjust it.
How to Fix B1640
- Begin by performing a visual inspection of the wiring and connectors in the mirror passenger left circuit to check for any visible damage or corrosion.
- Test the mirror control switch to ensure it is functioning correctly. Replace if necessary.
- Check the mirror motor for proper operation. If the motor is faulty, it will need to be replaced.
- Inspect the mirror assembly for any signs of corrosion or moisture ingress. Clean and repair as needed.
- If all components are in working order, the issue may lie with the ECU. Further diagnostic testing may be required to pinpoint the exact cause and address it accordingly.
Cost to Fix B1640
The cost of repairing a B1640 code can vary depending on the specific cause of the issue and the labor rates in your area. On average, the cost of parts for this repair could range from $50 to $200, with labor costs adding an additional $80 to $150 per hour. Overall, the total cost of resolving this issue could range from $150 to $500, but it's important to consult with a professional mechanic to get an accurate estimate based on your vehicle's make and model.
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Code B1640 Information for Specific Makes
- B1640 Acura — RF Unit Not Connected
- B1640 Chrysler — Front Right Turn Control Circuit High
- B1640 Dodge — Front Right Turn Control Circuit High
- B1640 Honda — RF Unit Not Connected
- B1640 Jeep — Front Right Turn Control Circuit High
- B1640 RAM — Front Right Turn Control Circuit High
Frequently Asked Questions about B1640 Code
1. What does the OBDII code B1640 mean?
B1640 indicates an open circuit in the passenger side mirror's electrical system, typically caused by wiring or component issues.
2. What are the common symptoms of code B1640?
Symptoms may include the passenger side mirror not adjusting, folding, or functioning properly, and potential loss of heating or dimming features.
3. What causes code B1640 to appear?
This code is often caused by damaged wiring, a faulty mirror motor, a disconnected electrical connector, or a malfunctioning control module.
4. How can I diagnose the B1640 code?
Inspect the wiring and connectors for damage or disconnection, check the mirror motor for functionality, and use a multimeter to test circuit continuity.
5. Can I still drive my car with the B1640 code?
Yes, the vehicle is generally safe to drive, but there may be inconvenience due to reduced functionality of the passenger side mirror.
6. How do I fix the B1640 code?
Repair or replace damaged wiring, reconnect loose connectors, or replace the faulty mirror motor or control module as needed.
7. How much does it cost to repair the B1640 code?
The cost varies depending on the issue, ranging from under $100 for simple wiring repairs to several hundred dollars for replacing the mirror assembly or control module.
8. Can a blown fuse cause the B1640 code?
Yes, a blown fuse in the mirror circuit can cause an open circuit issue and trigger the B1640 code.
9. Is B1640 a common code?
It’s not one of the most common codes but may appear in vehicles with electrical issues related to side mirrors.
10. What tools are needed to fix the B1640 code?
You may need a multimeter, wiring repair tools, and potentially an OBDII scanner to diagnose and confirm the repair.
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