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.

2010 Jeep Commander Limited, RWDFACTORY OEM SERVICE PROCEDURE

Circuit Schematic

Fig 1: Headlamp Circuit Schematic

GC0138725

Courtesy of CHRYSLER LLC

INTERMITTENT CONDITION
1. Turn the ignition on.
2. With the scan tool, clear all FCM DTCs.
3. Turn the Highbeam Headlamps on.
4. With the scan tool, read the DTC information.
  Does the scan tool display B1633-LEFT HI BEAM CONTROL CIRCUIT LOW?
  
  Yes
  - Go to step 2
  No
  - Test complete, the condition or conditions that originally set this DTC are not present at this time. Using the wiring diagrams as a guide, check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals, and correct pin tension.
  - Perform the BODY VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Front Control (FCM) - Standard Procedure .
(L33) LEFT HIGHBEAM OUTPUT CIRCUIT SHORTED TO GROUND

Fig 1: Checking Left High Beam Output Circuit Schematic
Courtesy of CHRYSLER LLC
1. Turn the ignition off.
2. Disconnect the FCM C2 harness connector.
3. Disconnect the Left Headlamp harness connector.
4. Measure the resistance between ground and the (L33) Left Highbeam Output circuit.
  Is the resistance below 5.0 Ohms?
  
  Yes
  - Repair the short to ground in the (L33) Left Highbeam Output circuit.
  - Perform the BODY VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Front Control (FCM) - Standard Procedure .
  No
  - Replace the FCM in accordance with the Service Information.
  - Perform the BODY VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Front Control (FCM) - Standard Procedure .

Factory Service Tools

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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.

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