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 MANUALSJEEP2009GRAND CHEROKEE OVERLAND, 5.7 T, EZHREPAIR AND DIAGNOSISENGINE PERFORMANCETUNE-UP(FRONT CONTROL MODULE (FCM) - ELECTRICAL DIAGNOSTICS)DTC TROUBLESHOOTINGB1647-REAR RIGHT TURN CONTROL CIRCUIT LOWDIAGNOSTIC TEST

2009 Jeep Grand Cherokee Overland, 5.7 T, EZH

Diagnostic Test

2009 Jeep Grand Cherokee Overland, 5.7 T, EZHSECTION Diagnostic Test

INTERMITTENT CONDITION
1. Turn the ignition on.
2. Using the scan tool, clear all FCM DTCs.
3. Turn the Right Turn Signals on.
4. With the scan tool read the DTC information.
  Does the scan tool read: B1647-REAR RIGHT TURN CONTROL CIRCUIT LOW?
  
  Yes
  - Go To 2
  No
  - The condition that caused the symptom is currently not present. Inspect the related wiring for a possible intermittent condition. Look for any chafed, pierced, pinched, or partially broken wires.
  - Perform the BODY VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Front Control (FCM) - Standard Procedure .
L62 REAR RIGHT TURN SIGNAL CONTROL CIRCUIT

Fig 1: Checking Rear Right Turn Signal Control Circuit
Courtesy of CHRYSLER LLC
1. Turn the ignition off.
2. Disconnect the IPM C2 connector.
3. Disconnect the Right Rear Tail Lamp connector.
4. Measure the resistance between ground and the (L62) Rear Turn Signal Control circuit.
  Is the resistance below 5.0 Ohms?
  
  Yes
  - Repair the (L62) Rear Right Turn Signal Control circuit for a short to ground.
  - Perform the BODY VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Front Control (FCM) - Standard Procedure .
  No
  - Go to step 3
FRONT CONTROL MODULE

Fig 2: Checking Front Control Module
Courtesy of CHRYSLER LLC
1. Turn the ignition off.
2. Disconnect the Front Control Module from the IPM 49-way connector.
3. Measure the resistance between ground and the (L62) Right Turn Signal Control circuit in the PDC.
  Is the resistance below 5.0 Ohms?
  
  Yes
  - Replace the Power Distribution Center in accordance with the service information.
  - Perform the BODY VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Front Control (FCM) - Standard Procedure .
  No
  - Replace the Front Control Module in accordance with the service information.
  - Perform the BODY VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Front Control (FCM) - Standard Procedure .

RENDER: 1.0x

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.