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.

SYS.OK|MANUAL.DB● LIVE

HOMESERVICE MANUALSJEEP2009COMMANDER OVERLAND, 4WDREPAIR AND DIAGNOSISENGINE PERFORMANCEIGNITION SYSTEMFRONT CONTROL MODULE (FCM) - ELECTRICAL DIAGNOSTICSDTC TROUBLESHOOTINGB1640-FRONT RIGHT TURN CONTROL CIRCUIT HIGHDIAGNOSTIC TEST

2009 Jeep Commander Overland, 4WD

Diagnostic Test

2009 Jeep Commander Overland, 4WDSECTION Diagnostic Test

TEST FOR INTERMITTENT CONDITION
1. Turn the ignition on.
2. Clear all FCM DTC's
3. Turn the Right Turn Signal on.
4. With the scan tool, read DTC's.
  Does the scan tool read: B1640-FRONT RIGHT TURN CONTROL CIRCUIT HIGH?
  
  Yes
  - Go to step 2
  No
  - The conditions that caused this code to set are not present at this time. Using the SYSTEM WIRING DIAGRAMS as a guide, inspect the wiring and connectors.
  - Perform the BODY VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Front Control (FCM) - Standard Procedure
FRONT RIGHT TURN SIGNAL BULB
1. Turn the ignition off.
2. Inspect the Front Right Turn Signal Bulb Assembly.
  Is the inoperative bulb OK?
  
  Yes
  - Go to step 3
  No
  - Replace the Inoperative bulb in accordance with the Service Information.
  - Perform the BODY VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Front Control (FCM) - Standard Procedure
L60 RIGHT TURN SIGNAL CONTROL CIRCUIT

Fig 1: Checking Right Turn Signal Control Circuit
Courtesy of CHRYSLER LLC
1. Turn the ignition off.
2. Disconnect the FCM C2 connector.
3. Measure the resistance of the (L60) Front Right Turn Signal Control circuit.
  Is the resistance above 5.0 ohms?
  
  No
  - Repair the (L60) Turn Signal Control circuit for an open.
  - Perform the BODY VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Front Control (FCM) - Standard Procedure
  Yes
  - Replace the Front Control Module.
  - Perform the BODY VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Front Control (FCM) - Standard Procedure

RENDER: 1.0x

NO RELATED

Recommended Tools & Savings

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

Affiliate disclosure: We may earn a commission at no extra cost to you.

Shop Manual-Ready Tools Free Quote Check Quote Shield Pro

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.