OBD code B1640 indicates an issue with the Mirror Passenger Motor circuit in the Body Control Module (BCM).
Symptoms include the Engine Light being ON.
The cause could be a faulty mirror passenger motor, open/shorted harness, or poor electrical connection.
This is a moderate issue.
To fix, inspect wiring harness, connectors, and components for damage, and check connector pins for any issues.
| Repair Importance Level | 10.0 (Out of 10) |
| Estimated Repair Time | Approximately 1.0 hour |
| Repair Difficulty Level | 10.0 (Out of 10) |
Symptoms of the b1640 OBD Code
The vehicle displays a warning light indicating a fault with the Occupant Classification System.
- Symptoms: Service Engine Soon Warning Light ON.
- Possible loss of communication with the smart junction box module.
- Difficulty starting the vehicle.
- Horn may not work.
- Power windows may not operate correctly.
Causes of the b1640 OBD Code
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Possible triggers for fault code B1640 include issues with the airbag system or seat belt pretensioners.
- B1640 can be caused by a faulty Mirror Passenger Motor.
- A Mirror Passenger Motor harness that is open or shorted.
- A Mirror Passenger Motor circuit with poor electrical connection.
- A faulty Body Control Module (BCM).
Fixing Error Code b1640 Step By Step
To address fault code B1640, inspect and repair the driver’s side airbag module circuit.
- To fix OBDII code B1640, first, review the possible causes related to the code.
- Visually examine the wiring harness and connectors associated with the code.
- Check for any damaged components and inspect the connector pins for signs of being broken, bent, pushed out, or corroded.
- Repair or replace any damaged wiring or connectors found during the inspection.
- Clear the fault code using a scan tool.
- Test drive the vehicle to ensure the code does not return.
Cost Of Fixing b1640 Fault Code
The repair for fault code B1640 may involve replacing the passenger airbag sensor module.
The cost to diagnose and fix OBD code B1640 depends on the estimated 1. 0hour repair time.
Labor rates usually range from $75 to $150 per hour, so the total cost could be between $75 and $150. Factors like shop rates and the complexity of the repair can influence the final cost.
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Details of the b1640 OBD Code
B1640 code indicates a malfunction in the air mix door position sensor circuit.
OBD code B1640 means Mirror Switch Input Circuit Failure.
This code is triggered by the Body Control Module (BCM) when it detects a malfunction in the circuit related to the mirror switch input.
The mirror switch input circuit is part of the vehicle’s interior control system and is responsible for controlling the adjustment of the mirrors.
When this circuit fails or malfunctions, the BCM detects it and sets code B1640 to indicate the issue with the mirror switch input circuit.
Mechanic’s Tech Notes
Code B1640 indicates a fault in the driver’s side airbag module.
OBDII code B1640 indicates a fault with the transmission control module (TCM) power circuit.
To diagnose, use a multimeter to check TCM power and ground connections for proper voltage and continuity.
Utilize a scan tool to confirm TCM communication over the Controller Area Network (CAN) bus.
Visually inspect wiring harnesses and connectors for damage, and ensure connector pins are not broken, bent, or corroded.
If necessary, consider reprogramming or reflashing the TCM.
FAQ
OBD code B1640 indicates an issue with the Mirror Passenger Motor circuit. Check for faults in the motor, wiring, and connectors for repair.
Common symptoms of OBD code B1640 include Engine Light ON, caused by issues like faulty mirror passenger motor, harness problems, or faulty Body Control Module (BCM).
Diagnose OBD code B1640 by checking Mirror Passenger Motor and BCM. Inspect wiring for damage or poor connections. Repair as needed.
Wrap Up
If your vehicle is displaying OBD code b1640 along with issues like erratic speedometer readings or a nonfunctional cruise control system, it may indicate a fault in the vehicle speed sensor circuit.
Possible causes include a faulty vehicle speed sensor, damaged wiring harness, or poor electrical connections.
To address OBD code b1640, start by inspecting the vehicle speed sensor and its wiring for any visible damage.
Test the sensor’s output signal using a multimeter to ensure it is within specifications.
Check the wiring harness for any signs of wear, corrosion, or loose connections that may be affecting the sensor
