B1407 — Driver Power Window Up Circuit Open #

The code label may vary depending on the OEM (Original Equipment Manufacturer).

Known label variations:

• Driver Power Window Up Circuit/Open (Toyota, Lexus, Scion)
• Front Left Power Window Up Circuit Open (Honda, Acura)
• Driver Side Power Window Switch Up Circuit Malfunction (Nissan, Infiniti)
• Driver Door Window Up Control Circuit Open (Mazda)

Summary of code B1407 #

B1407 is an OBD-II (On-Board Diagnostics II) trouble code indicating the up circuit for the driver’s power window is open. In simpler terms, the car’s computer has detected a break or malfunction in the electrical path that raises the driver’s window. This code is commonly flagged when a window fails to operate as expected, especially when the switch for moving the window up does not respond. The “open circuit” means electricity isn’t flowing where it should, usually due to a bad connection, damaged wiring, or a failed component. This is a fairly frequent code in vehicles equipped with power windows, and while not a critical safety issue, it can cause inconvenience and signal a deeper electrical problem.

Frequent symptoms for code B1407 #

A vehicle displaying the B1407 code will often show clear signs of trouble with the driver’s power window. The most obvious symptom is the window refusing to move up when the switch is pressed. Sometimes, the window may work intermittently, or there may be no sound at all from the window motor. Occasionally, other electrical features in the same door could act up, depending on shared wiring or fuses.

• Driver’s window does not move up when switch is pressed
• Window may be stuck partially open or fully down
• No noise or clicking from window motor when activating the switch
• Window moves down but not up
• Other door electrical functions may be affected (rare)
• Intermittent operation of the driver window

Probable causes for code B1407 #

The B1407 code can be triggered by several underlying issues, but some causes are more common than others. Typically, the problem traces back to a break or high resistance in the wiring, a faulty window switch, or a failed window motor. Damaged connectors or corrosion inside the door can also be culprits. Here are the most likely causes, ranked by their frequency:

1. Broken or damaged wiring in the driver door harness
2. Faulty driver’s power window switch
3. Defective power window motor (driver’s side)
4. Corroded or loose electrical connectors at switch or motor
5. Blown fuse or relay for power windows
6. Fault in the door control module (if equipped)

Step-by-step diagnosis for code B1407 #

Diagnosing B1407 requires a logical approach to pinpoint the exact location of the open circuit or failed component. Begin with the most accessible parts and move toward the more involved checks. Here is a step-by-step process trusted by professional technicians:

• Verify the complaint — Confirm that the driver’s window fails to move up when the switch is pressed.
• Check for related trouble codes — Scan for other codes that might point to broader electrical problems.
• Inspect the fuse and relay — Find and test the fuse/relay dedicated to the power windows; replace if blown or faulty.
• Test the driver window switch — Use a multimeter to check for continuity and proper output from the switch when pressed.
• Check wiring and connectors — Inspect the wiring harness running from the body to the door (especially where it flexes); look for broken, pinched, or corroded wires and connectors.
• Test the window motor — Apply direct battery power to the window motor terminals to verify operation in both directions.
• Check for voltage at the motor — With the switch pressed, test for voltage at the motor connector; a lack of voltage suggests an upstream problem.
• Inspect the door control module (if present) — Check for module-related faults or communication errors.

Possible repairs for code B1407 #

Once the root cause has been identified, the repair will depend on the specific fault. Start with the simplest fix and re-test after each step.

• Repair or replace damaged wiring in the driver door harness
• Replace the driver’s power window switch if it fails continuity or output tests
• Replace the driver’s power window motor if it does not operate with direct power
• Clean or repair corroded connectors at the switch or motor
• Replace blown fuse or faulty relay
• Replace or reprogram the door control module if diagnosed as faulty

Is it safe to drive with code B1407? #

Yes, you can safely drive with code B1407. This code does not affect engine operation, braking, or core vehicle safety systems. However, you will lose the function of the driver’s window going up, which can be inconvenient or even a security risk if the window is stuck open. If you live in areas with frequent rain, dust, or extreme temperatures, repairing this problem sooner is strongly advised to avoid interior damage or theft risk.

Vehicles most commonly affected by code B1407 #

While B1407 can appear on many modern vehicles with power windows, it is most frequently seen on certain models from Japanese manufacturers. These vehicles are known to use similar switch and wiring designs, sometimes prone to wear at the door harness.

• Toyota Camry, Corolla, RAV4, Tacoma (2005–2018)
• Lexus ES, RX, IS (2007–2015)
• Honda Accord, Civic, CR-V (2008–2016)
• Nissan Altima, Sentra, Rogue (2009–2017)
• Mazda 3, Mazda 6, CX-5 (2010–2018)
• Scion tC, xB (2007–2015)

Common mistakes & best practices for code B1407 #

It’s easy to misdiagnose B1407 if you overlook the basics or rush to replace expensive parts. Avoid these pitfalls by following industry best practices:

• Don’t replace the window motor or switch before testing wiring and fuses. Many times, a simple wiring repair is all that’s needed.
• Check for broken wires inside the rubber boot between the car body and the door, a common failure point.
• Use a multimeter to confirm voltage and ground at each step; never assume a part is bad without testing.
• If corrosion is present, clean and apply dielectric grease to prevent future issues.
• Always clear the code and retest the system after repairs to confirm the fix.

Quick FAQ for code B1407 #

Q: Can a bad window switch cause B1407?
A: Yes. If the driver’s window switch fails internally or loses connection, it can interrupt the up circuit and trigger B1407.

Q: My window goes down but not up. Is that always a motor problem?
A: Not necessarily. The motor is bi-directional; if it works one way, the issue is usually with the switch or wiring for the up circuit — not the motor itself.

Q: Can I reset code B1407 by disconnecting the battery?
A: Disconnecting the battery may clear the code temporarily, but if the fault remains, the code will return as soon as you attempt to use the window. Always fix the root cause.