B1426: Seat Belt Indicator Circuit Short to Battery
The Restraint Control Module (RCM) or Body Control Module (BCM) has detected a short circuit to battery voltage (B+) in the seat belt indicator circuit within the instrument cluster. This prevents proper control of the warning lamp (on/off/flashing) during the bulb test or seat belt usage monitoring.
1. Commonly Affected Makes
2. Most Common Causes
- Seat belt indicator circuit wiring shorted to a battery power source (B+)
- Faulty instrument cluster (IPC) with an internal shorted driver
- Defective RCM or BCM
- Damaged connectors or corroded terminals bridging power circuits
3. Symptoms You Will Notice
- Seat belt warning light stays on continuously or fails to illuminate
- Seat belt warning light does not flash or behave correctly during bulb test
4. Step-by-Step Diagnosis
Check for technical service bulletins (TSBs) related to the seat belt indicator circuit
Visually inspect the seat belt indicator circuit wiring and connectors for shorts to B+
Test the instrument cluster (IPC) for internal short circuits
Verify RCM and BCM functionality and communication
Repair or replace any damaged wiring, connectors, or modules as needed
5. Frequently Asked Questions
Is it safe to drive?▼
Yes, but the seat belt warning system may not function correctly, which could reduce safety reminders. Have it diagnosed soon.
How much does it cost to fix?▼
Typically $100 to $400, depending on whether the fix involves wiring repair or module replacement.