B1471: Headlamp Switch Input Open Circuit
The B1471 code indicates that the Body Control Module (BCM) or Smart Junction Box (SJB) has detected an open circuit in the headlamp switch input signal. This means the module is not receiving the expected voltage or ground signal when the driver requests the headlights to turn on, preventing automatic or manual control of the low/high beams.
1. Commonly Affected Makes
2. Most Common Causes
- Open circuit in the wiring between the headlamp switch and the BCM/SJB
- Defective or worn headlamp switch
- Loose, corroded, or damaged connector at the switch or BCM/SJB
- Blown fuse in the switch power circuit
- Internal BCM/SJB failure
3. Symptoms You Will Notice
- Headlights do not turn on or operate intermittently
- Automatic headlight function inoperative
- Daytime running lights may stay on or malfunction
- Instrument cluster warning light for headlights
4. Step-by-Step Diagnosis
Check for blown fuses related to the headlamp circuit and replace if necessary.
Inspect the headlamp switch connector for corrosion, damage, or loose pins.
Test the headlamp switch for continuity and proper operation using a multimeter.
Verify wiring continuity between the switch and BCM/SJB; repair any open or short circuits.
If all else is fine, test the BCM/SJB for proper input signals; replace if faulty.
5. Frequently Asked Questions
Is it safe to drive?▼
Driving at night or in low visibility conditions is not safe because the headlights may not work. During the day, it may be drivable but should be repaired promptly.
How much does it cost to fix?▼
The repair cost typically ranges from $100 to $400, depending on whether the issue is a simple fuse or switch replacement versus a BCM/SJB replacement.