B1478
Low Severity (Level 1)Power Window One Touch Up/Down Activated Simultaneously
B1478 usually means power Window One Touch Up/Down Activated Simultaneously.
Can you still drive with B1478?
✅Safe to drive — this is an informational or minor issue. Schedule diagnosis at your convenience.
Typical repair cost: $100 – $500
Severity Level 1 — Low
This code indicates a minor issue that is unlikely to cause immediate driveability problems. You can typically continue driving but should have the vehicle inspected at your earliest convenience.
Common Symptoms
- Window moves slowly or only works from one switch
- Power window won't go up or down — stuck in current position
- Diagnostic trouble code (DTC) stored in module memory
- Fault may be intermittent — code may clear itself and reappear
- Reduced vehicle functionality related to the power window system
Possible Causes
- Faulty window motor/regulator — most common cause, test before replacing
- Damaged or corroded wiring/connector in the power window system circuit
- Blown fuse or faulty relay for the power window system
- Poor ground connection — check and clean all related ground points
- Control module fault — rare but possible, only consider after ruling out simpler causes
- Window regulator mechanical failure — cable snapped or pulley broken, motor runs but glass doesn't move
Common Fixes
- Scan vehicle with a professional-grade OBD2 scanner to read all stored codes and freeze frame data — note the conditions when the code set ($18-112 at shop, free at auto parts store for basic scan)
- Visually inspect the power window system wiring harness and connectors — look for chafed wires, melted insulation, green corrosion, loose pins, or rodent damage (often free to check yourself, $93 diagnostic fee at shop)
- Inspect the wiring boot where it passes from the body into the door — this is the #1 failure point. Peel back the rubber boot and check for broken/cracked wires ($0 DIY inspection)
- Replace window motor/regulator if testing confirms it has failed — use OEM quality, avoid the cheapest no-name aftermarket parts that fail in a year ($100-500)
- Check and replace any blown fuses in the power window system fuse circuit — if fuse blows again, there's still a short that needs to be found ($1-11 for fuses)
Estimated Repair Cost
These are estimated costs based on generic repair data. Actual costs may vary depending on your vehicle, location, and labor rates.
Frequently Asked Questions
What does B1478 mean?
B1478 stands for "Power Window One Touch Up/Down Activated Simultaneously". B1478 usually means power Window One Touch Up/Down Activated Simultaneously.
Can you drive with B1478?
Safe to drive — this is an informational or minor issue. Schedule diagnosis at your convenience.
How much does it cost to fix B1478?
Repair costs for B1478 typically range from $100 to $500, depending on your vehicle make, model, and local labor rates. Common fixes include: Scan vehicle with a professional-grade OBD2 scanner to read all stored codes and freeze frame data — note the conditions when the code set ($18-112 at shop, free at auto parts store for basic scan); Visually inspect the power window system wiring harness and connectors — look for chafed wires, melted insulation, green corrosion, loose pins, or rodent damage (often free to check yourself, $93 diagnostic fee at shop); Inspect the wiring boot where it passes from the body into the door — this is the #1 failure point. Peel back the rubber boot and check for broken/cracked wires ($0 DIY inspection).
Will B1478 clear itself?
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