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 MANUALSJEEP2010GRAND CHEROKEE LAREDO, 5.7 T, 4WDREPAIR AND DIAGNOSIS (SINGLE PAGE)ACCESSORIES & EQUIPMENTANTI-THEFT SYSTEMSPASSENGER DOOR MODULE (PDM) - ELECTRICAL DIAGNOSTICSDTC TROUBLESHOOTINGDTC B1D39: PASSENGER MIRROR HEATER CONTROL CIRCUIT OPENDIAGNOSTIC TEST

2010 Jeep Grand Cherokee Laredo, 5.7 T, 4WD

Diagnostic Test

2010 Jeep Grand Cherokee Laredo, 5.7 T, 4WDSECTION Diagnostic Test

TEST FOR INTERMITTENT CONDITION
1. Turn the ignition on.
2. Verify that the Rear Window Defogger (EBL) mode switch is off (EBL status indicator not illuminated).
3. With the scan tool, record and erase DTCs.
4. Turn the ignition off, wait 10 seconds, then turn the ignition on.
5. Press the Rear Window Defogger (EBL) mode switch on.
6. With the scan tool, read DTCs.
  Does the scan tool display: B1D39-PASSENGER MIRROR HEATER CONTROL CIRCUIT OPEN?
  
  Yes
  - Go to step 2
  No
  - The conditions that caused this code to set are not present at this time. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors.
  - Perform the BODY VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Front Control (FCM) - Standard Procedure .
TEST FOR AN OPEN OUTSIDE REARVIEW MIRROR

Fig 1: Testing For An Open Outside Rearview Mirror
Courtesy of CHRYSLER LLC
1. Press the Rear Window Defogger (EBL) mode switch off.
2. Turn the ignition off.
3. Disconnect the Passenger Outside Rearview Mirror connector.
4. Connect a 12-volt test light between the (C16) Passenger Mirror Heater Driver circuit and the (C917) Passenger Mirror Heater Return circuit.
5. Turn the ignition on.
6. Press the Rear Window Defogger (EBL) mode switch on.
  Does the test light illuminate brightly?
  
  Yes
  - Replace the Outside Rearview Mirror in accordance with the Service Information.
  - Perform the BODY VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Front Control (FCM) - Standard Procedure .
  No
  - Go to step 3
CHECK THE (C16) PASSENGER MIRROR HEATER DRIVER CIRCUIT FOR AN OPEN

Fig 2: Measuring Resistance Of Passenger Mirror Heater Driver Circuit
Courtesy of CHRYSLER LLC
1. Turn the ignition off.
2. Disconnect the Passenger Door Module C1 connector.
3. Measure the resistance of the (C16) Passenger Mirror Heater Driver circuit between the Passenger Outside Rearview Mirror connector and the Passenger Door Module C1 connector.
  Is the resistance below 2.0 ohms?
  
  Yes
  - Go to step 4
  No
  - Repair the (C16) Passenger Mirror Heater Driver circuit for an open.
  - Perform the BODY VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Front Control (FCM) - Standard Procedure .
CHECK THE (C917) PASSENGER MIRROR HEATER RETURN CIRCUIT FOR AN OPEN

Fig 3: Measuring Resistance Of Passenger Mirror Heater Return Circuit
Courtesy of CHRYSLER LLC
1. Measure the resistance of the (C917) Passenger Mirror Heater Return circuit between the Passenger Outside Rearview Mirror connector and the Passenger Door Module C1 connector.
  Is the resistance below 2.0 ohms?
  
  Yes
  - Replace the Passenger Door Module in accordance with the Service Information.
  - Perform the BODY VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Front Control (FCM) - Standard Procedure .
  No
  - Repair the (C917) Passenger Mirror Heater Return circuit for an open.
  - Perform the BODY VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Front Control (FCM) - Standard Procedure .

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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.