B2659 Mercury Code - Courtesy Switch Fault
Quick Answer
For vehicles equipped with Keyless Entry System (RKE), the vehicle security module sends an interior lamps ON request to the Instrument Cluster Module (ICM) through UART Based Protocol (UBP) whenever a door has been opened, the unlock button has been pressed on the remote transmitter, or when an unlock request has been entered with the keyless keypad (if equipped). Common causes include Blown Courtesy Lamp Bulb, Faulty Door Ajar Switch, Faulty Interior Lamp Switch. 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
- B2659 Mercury indicates Courtesy Switch Fault.
- Common causes
- Common causes include Blown Courtesy Lamp Bulb, Faulty Door Ajar Switch, Faulty Interior Lamp Switch.
- 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.
Code B2659 Mercury Description
For non-RKE vehicles, the ICM energizes the circuit when a door has been opened, which provides power to the interior lamps. The interior lamps can also be turned ON or OFF with the interior lamp switch. The interior lamps are grounded through the circuit, and will remain illuminated until the ICM removes voltage from the circuit.
What are the Possible Causes of the DTC B2659 Mercury?
- Blown Courtesy Lamp Bulb
- Faulty Door Ajar Switch
- Faulty Interior Lamp Switch
- Interior Lamp Switch harness is open or shorted
- Interior Lamp Switch circuit poor electrical connection
- Faulty Instrument Cluster Module (ICM)
How to Fix the DTC B2659 Mercury?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the B2659 Mercury code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Frequently Asked Questions about B2659 Mercury Code
1. What are the common symptoms of OBDII code B2659 (Courtesy Switch Fault) in a Mercury vehicle?
- Common symptoms include interior lights not turning on/off properly, power windows not functioning correctly, and issues with the courtesy or dome light.
2. What could cause the OBDII code B2659 (Courtesy Switch Fault) to trigger in a Mercury car?
- The code may be triggered by a faulty courtesy switch, wiring issues, a blown fuse, or a malfunctioning control module.
3. How can I diagnose the Courtesy Switch Fault in my Mercury vehicle?
- You can use a diagnostic scanner to retrieve the specific code B2659. Check the courtesy switch for proper operation and inspect the wiring and fuse related to the interior lights.
4. What are some DIY repair tips for fixing the Courtesy Switch Fault in a Mercury car?
- Start by checking and replacing any blown fuses related to the interior lights. Inspect the courtesy switch for proper functionality and replace it if necessary. Ensure all wiring connections are secure.
5. Can the OBDII code B2659 (Courtesy Switch Fault) be cleared/reset in a Mercury vehicle?
- Yes, after fixing the underlying issue causing the code, you can clear/reset the code using an OBDII scanner or by disconnecting the car's battery for a few minutes.
6. Is it safe to continue driving with the OBDII code B2659 (Courtesy Switch Fault) present in a Mercury car?
- While the issue may not affect the drivability of the vehicle, it is essential to address the problem promptly to prevent potential electrical issues or drain on the battery.
7. How much does it typically cost to repair the Courtesy Switch Fault in a Mercury vehicle?
- The cost of repair can vary depending on the root cause of the issue. Simple fixes like replacing a fuse or the courtesy switch may cost less, while addressing wiring or control module problems could be more expensive.
8. Are there any recalls or technical service bulletins related to the OBDII code B2659 (Courtesy Switch Fault) in Mercury vehicles?
- It is advisable to check with a Mercury dealership or visit the manufacturer's website to see if there are any relevant recalls or technical service bulletins related to this specific OBDII code.
9. Will fixing the Courtesy Switch Fault OBDII code require professional assistance, or can it be done by a DIY enthusiast?
- Depending on the complexity of the issue, DIY enthusiasts with basic automotive knowledge may be able to address and repair the Courtesy Switch Fault. However, if unsure, it is recommended to seek professional help.
10. How can I prevent the OBDII code B2659 (Courtesy Switch Fault) from reoccurring in my Mercury vehicle?
- Regularly inspect and maintain the interior lighting components, including the courtesy switch, wiring, and fuses. Address any issues promptly to prevent the code from reoccurring.
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