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 DIAGNOSISBRAKESBRAKES CONTROL SYSTEMSFRONT CONTROL MODULE (FCM) - ELECTRICAL DIAGNOSTICSDTC TROUBLESHOOTINGB1667-REVERSE LAMP CONTROL CIRCUIT LOWDIAGNOSTIC TEST

2009 Jeep Commander Sport, 3.7 K, RWD

Diagnostic Test

2009 Jeep Commander Sport, 3.7 K, RWDSECTION Diagnostic Test

INTERMITTENT CONDITION
1. Turn the ignition on.
2. With the Scan Tool, clear all FCM DTC's.
3. Shift the transmission into reverse.
4. With the Scan Tool read the DTC information.
  Does the Scan Tool read: B1667-REVERSE LAMP 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
(L1) BACK-UP LAMP FEED CIRCUIT

Fig 1: Checking Back-Up Lamp Feed Circuit
Courtesy of CHRYSLER LLC
1. Turn the ignition off.
2. Disconnect the IPM C2 connector.
3. Measure the resistance between ground and the (L1) Back-up Lamp circuit.
  Is the resistance below 5.0 ohms?
  
  Yes
  - Repair the (L1) Back-up Lamp circuit for a short to ground.
  - 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.