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.

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HOMESERVICE MANUALSJEEP2009COMMANDER SPORT, 3.7 K, RWDREPAIR AND DIAGNOSIS (SINGLE PAGE)ACCESSORIES & EQUIPMENTCOMMUNICATION DEVICESSUNROOF MODULE (SUNR) - ELECTRICAL DIAGNOSTICSDTC TROUBLESHOOTINGB1847-SUNROOF VENT SWITCH INPUT CIRCUIT HIGHDIAGNOSTIC TEST

2009 Jeep Commander Sport, 3.7 K, RWD

Diagnostic Test

2009 Jeep Commander Sport, 3.7 K, RWDSECTION Diagnostic Test

TEST FOR INTERMITTENT CONDITION
1. Turn the ignition on.
2. Using the scan tool, record and erase DTCs
3. Press and release the Sunroof Switch in all positions several times.
4. Wait 30 seconds.
5. Using the scan tool, read DTCs.
  Does the scan tool display B1847-SUNROOF VENT SWITCH INPUT CIRCUIT HIGH?
  
  Yes
  - Go to step 2
  No
  - The conditions that caused this code to set are not present at this time. Check the switch for any binding conditions and using the SYSTEM WIRING DIAGRAMS as a guide, inspect the wiring and connectors.
SUNROOF SWITCH SHORTED

Fig 1: Checking Sunroof Switch Shorted
Courtesy of CHRYSLER LLC
1. Using the scan tool, erase DTCs.
2. Turn the ignition off.
3. Disconnect the Sunroof Switch connector.
4. Turn the ignition on and wait 30 seconds.
5. Using the scan tool, read DTCs.
  Does the scan tool display B1847-SUNROOF VENT SWITCH INPUT CIRCUIT HIGH?
  
  Yes
  - Go to step 3
  No
  - Replace the Sunroof Switch.
  - Perform the BODY VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Front Control (FCM) - Standard Procedure .
(Q4) SUNROOF VENT SWITCH SENSE CIRCUIT SHORTED TO VOLTAGE

Fig 2: Checking Sunroof Vent Switch Sense Circuit For Short To Voltage
Courtesy of CHRYSLER LLC

RENDER: 1.0x

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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.