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 LIMITED, 5.7 T, 4WDREPAIR AND DIAGNOSISENGINE PERFORMANCEENGINE CONTROL SYSTEMS(FRONT CONTROL MODULE (FCM) - ELECTRICAL DIAGNOSTICS)DTC TROUBLESHOOTINGB2184-IGNITION UNLOCK RUN/START CONTROL CIRCUIT LOWDIAGNOSTIC TEST

2010 Jeep Grand Cherokee Limited, 5.7 T, 4WD

Diagnostic Test

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

CHECK FOR ACTIVE DTC
1. With the scan tool, read the active DTCs.
2. Cycle the ignition switch from off to on, leaving the ignition on for a minimum of 10 seconds.
3. With the scan tool, read the active DTCs.
  Does the scan tool display this DTC as active?
  
  Yes
  - Go to step 2
  No
  - If the DTC is stored, check for an intermittent condition. Using the wiring diagram/schematic as a guide, visually inspect the related wiring harness connectors. Look for broken, bent, pushed out, or corroded terminals.
  - Perform the BODY VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Front Control (FCM) - Standard Procedure .
DETERMINE ENGINE SIZE
Is this vehicle equipped with a 3.7L or 6.1L engine?

Yes
- Go to step 3
No
- Go to step 6
SHIFT LEVER ASSEMBLY

Fig 1: Identifying Shift Lever Assembly Harness Connector Terminals
Courtesy of CHRYSLER LLC
1. With the scan tool, erase the FCM DTCs.
2. Turn the ignition off.
3. Disconnect the Shift Lever Assembly harness connector.
4. Cycle the ignition switch from off to on, leaving the ignition on for a minimum of 10 seconds.
5. With the scan tool, read the active FCM DTCs.
  Does the scan tool display this DTC as active?
  
  Yes
  - Go to step 4
  No
  - Replace the Shift Lever Assembly in accordance with the Service Information.
  - Perform the BODY VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Front Control (FCM) - Standard Procedure .
(F1) FUSED IGNITION SWITCH OUTPUT WIRE SHORT TO GROUND

Fig 2: Identifying Fused Ignition Switch Output Circuit Terminal At IPM C1 Connector
Courtesy of CHRYSLER LLC
1. Turn the ignition off.
2. Disconnect the Integrated Power Module C1 harness connector.
3. Measure the resistance between ground and the (F1) Fused Ignition Switch Output circuit in the IPM C1 connector.
  Is the resistance below 1000.0 ohms?
  
  No
  - Go to step 5
  Yes
  - Repair the (F1) Fused Ignition Switch Output circuit for a short to ground.
  - Perform the BODY VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Front Control (FCM) - Standard Procedure .
INTEGRATED POWER MODULE SHORTED

Fig 3: Identifying Fused Ignition Switch Output Circuit Terminal At Front Control Module IPM Connector
Courtesy of CHRYSLER LLC
1. Remove the FCM from the Integrated Power Module.
2. Measure the resistance between ground and the (F1) Fused Ignition Switch Output circuit in the Front Control Module IPM connector.
  Is the resistance below 1000.0 ohms?
  
  Yes
  - Replace the Integrated Power Module in accordance with Service Information.
  - Perform the BODY VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Front Control (FCM) - Standard Procedure .
  No
  - Replace and program 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 .
POWERTRAIN CONTROL MODULE

Fig 4: Identifying Powertrain Control Module C1 Connector Terminals
Courtesy of CHRYSLER LLC
1. With the scan tool, erase the FCM DTCs.
2. Turn the ignition off.
3. Disconnect the Powertrain Control Module C1 connector.
4. Cycle the ignition switch from off to on, leaving the ignition on for a minimum of 10 seconds.
5. With the scan tool, read the active FCM DTCs.
  Does the scan tool display this DTC as active?
  
  Yes
  - Go to step 7
  No
  - Replace the Powertrain Control Module in accordance with the Service Information.
  - Perform the BODY VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Front Control (FCM) - Standard Procedure .
(F1) FUSED IGNITION SWITCH OUTPUT WIRE SHORT TO GROUND

Fig 5: Identifying Fused Ignition Switch Output Circuit Terminal At IPM C1 Connector
Courtesy of CHRYSLER LLC
1. Turn the ignition off.
2. Disconnect the Integrated Power Module C1 harness connector.
3. Measure the resistance between ground and the (F1) Fused Ignition Switch Output circuit in the IPM C1 connector.
  Is the resistance below 1000.0 ohms?
  
  No
  - Go to step 5
  Yes
  - Repair the (F1) Fused Ignition Switch Output circuit for a short to ground.
  - Perform the BODY VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Front Control (FCM) - Standard Procedure .

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.