OBD Guide
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B1977

Passengers Front Seat Up Switch Circuit Short To Battery

B1977 is an OBD-II diagnostic trouble code meaning: Passengers Front Seat Up Switch Circuit Short To Battery. Common causes: short circuit in wiring harness, faulty seat up switch. Estimated repair cost: $56–167.

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$56–167 (est.)

Symptoms

  • The front passenger seat cannot be adjusted
  • Seat switch lights do not work
  • Error message on the dashboard

Causes

  • Short circuit in wiring harness
  • Faulty seat up switch
  • Damaged wires in the door or under the seat
  • Problems with the seat control module

How to Fix

  1. Check fault codes and freeze frame data
  2. Visually inspect the wiring harness and connections under the seat
  3. Check the resistance of the lift switch
  4. Check continuity between switch and module
  5. If necessary, replace the switch or repair the harness

Related codes

B1978B1979B1100

FAQ

What does the B1977 code mean?

B1977 is an OBD-II diagnostic trouble code that indicates: Passengers Front Seat Up Switch Circuit Short To Battery

What causes a B1977 error code?

The most common causes of B1977 include: Short circuit in wiring harness; Faulty seat up switch; Damaged wires in the door or under the seat; Problems with the seat control module.

How do I fix a B1977 diagnostic trouble code?

To fix B1977: Check fault codes and freeze frame data. Visually inspect the wiring harness and connections under the seat. Check the resistance of the lift switch. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B1977?

Yes, but get it checked soon

How much does it cost to fix B1977?

The estimated repair cost for B1977 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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