Seat Heater Circuit Short to Ground
Indicates a short in the seat heater circuit.
Heads up: this code wasn't in our hand-written library yet, so DiagCoach AI built this page on the fly. Double-check critical specs against service info before condemning parts.
What it means (plain English)
The seat heater is trying to work but there's an unwanted connection to the ground, making it stay on or malfunction.
What the computer is actually seeing
The body control module (BCM) monitors the seat heater circuit for resistance. When the circuit has less than 1 ohm resistance, it triggers the B1377 code because it thinks there's a short to ground.
What a healthy reading looks like
Normal operation should show resistance between 5-20 ohms in the seat heater circuit.
Guided diagnostic — the DiagCoach way
Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.
- 11. Inspect the wiring and connectors at the seat heater for visible damage or corrosion. Decision: If damage is found, repair or replace as necessary. If no damage, proceed to step 2.
- 22. Measure resistance across the seat heater element. Decision: Should be 5-20 ohms. If below this range, replace the seat heater element. If within range, proceed to step 3.
- 33. Check the BCM's seat heater control signal output. Use a scan tool to monitor the command to the seat heater. Decision: If the BCM is commanding the heater on with no faults, the issue may lie in the BCM itself. If not, investigate further.
Common causes
- Damaged wiring in the seat heater harness
- Faulty seat heater element
- Corroded connectors
- Incorrect installation of aftermarket seat covers
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
Yes, but the seat heater may not work properly. It's best to fix it soon.
Will this code come back after clearing?
If the underlying issue isn't fixed, it will likely return.
Why does this code appear with other issues?
Wiring harness issues can affect multiple circuits, often leading to multiple codes.
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