Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
B1847 - Sunroof Vent Switch Input Circuit High: Notes
For a complete wiring diagram, refer to the appropriate SYSTEM WIRING DIAGRAMS information .
Theory of Operation
The sunroof motor/module supplies a 12 volt supply circuit to the sunroof switch. When the switch is closed to any of the 3 sense circuits (open, close or vent), it sends that command back to the module.
- When Monitored: Whenever the sunroof module is awake.
- Set Condition: Whenever the module has determined that the vent switch has been applied for over 15 seconds, there is a short to voltage, a short to ground or an open on the sunroof vent switch sense circuit, this code will set.
| Possible Causes |
|---|
| Q4 SUNROOF VENT SWITCH SENSE CIRCUIT SHORT TO VOLTAGE |
| Q4 SUNROOF VENT SWITCH SENSE CIRCUIT SHORT TO GROUND |
| Q4 SUNROOF VENT SWITCH SENSE CIRCUIT OPEN |
| Q4 SUNROOF VENT SWITCH SENSE CIRCUIT SHORT to Q6 SUNROOF SWITCH SUPPLY CIRCUIT |
| SUNROOF SWITCH SHORT |
| SUNROOF MOTOR/MODULE |
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.