B1977
Low Severity (Level 1)Passenger''s Front Seat Up Switch Circuit Short to Battery
B1977 usually means passenger''s Front Seat Up Switch Circuit Short to Battery.
Can you still drive with B1977?
✅Safe to drive — this is an informational or minor issue. Schedule diagnosis at your convenience.
Typical repair cost: $120 – $1000
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
- Seat memory settings not saving or recalling correctly
- Power seats staying on or functioning when they shouldn't (powered continuously)
- Power seats not responding to controls — stuck in one state
- Excessive current draw on the power seat system circuit (fuse may blow repeatedly)
Possible Causes
- Damaged wiring in the power seat system harness shorted to a 12V power source — wiring insulation chafed through from rubbing against metal body panels
- Water intrusion or corrosion in power seat system electrical connector causing internal short to battery voltage
- Failed seat motor/module — internal short to power within the component
- Aftermarket accessory installation tapped into the wrong circuit, back-feeding 12V
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 ($31-105 at shop, free at auto parts store for basic scan)
- Visually inspect the power seat system wiring harness and connectors — look for chafed wires, melted insulation, green corrosion, loose pins, or rodent damage (often free to check yourself, $144 diagnostic fee at shop)
- Repair or replace damaged section of wiring harness where short is located — solder and heat-shrink all connections, don't use crimp connectors on critical circuits ($166-276 depending on accessibility)
- If seat motor/module is internally shorted, replace with a quality OEM or OEM-equivalent aftermarket unit ($100-800)
- Clean all ground points related to the power seat system — remove bolt, sand contact surface to bare metal, apply dielectric grease, and torque to spec ($68-141 at shop)
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 B1977 mean?
B1977 stands for "Passenger''s Front Seat Up Switch Circuit Short to Battery". B1977 usually means passenger''s Front Seat Up Switch Circuit Short to Battery.
Can you drive with B1977?
Safe to drive — this is an informational or minor issue. Schedule diagnosis at your convenience.
How much does it cost to fix B1977?
Repair costs for B1977 typically range from $120 to $1000, 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 ($31-105 at shop, free at auto parts store for basic scan); Visually inspect the power seat system wiring harness and connectors — look for chafed wires, melted insulation, green corrosion, loose pins, or rodent damage (often free to check yourself, $144 diagnostic fee at shop); Repair or replace damaged section of wiring harness where short is located — solder and heat-shrink all connections, don't use crimp connectors on critical circuits ($166-276 depending on accessibility).
Will B1977 clear itself?
Related Repair Costs
Explore Repair Costs
Related OBD-II Codes
These codes are in the same range as B1977 and often share similar causes and fixes.
Worried about repair costs?
Get transparent estimates and verify your mechanic's quote before authorizing repairs.
Related Discussions
See what other car owners are saying about this code and related repairs.
View B1977 discussions in the community