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Home >> Jeep >> 2009 >> Commander Overland, 4WD >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Communication Devices >> Automatic Headlamp Leveling Module (AHLM) - Electrical Diagnostics >> DTC Troubleshooting >> B1681-Rear Headlamp Leveling Sensor Circuit Performance >> Diagnostic Test
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Diagnostic Test

  1. ACTIVE DTC 
    1. Ignition on, engine not running.
    2. With the scan tool, record and erase DTCs.
    3. Turn the headlamps on.
    4. With the scan tool, read DTCs.

      Is the status Active for this DTC?

      Yes 

      • Go to step  2

      No 

      • Go to step  12
  2. (L962) HEADLAMP LEVELING SENSOR RETURN CIRCUIT SHORTED TO VOLTAGE 
    Fig 1: Checking Headlamp Leveling Sensor Return Circuit Shorted To Voltage
    GC0119828Courtesy of CHRYSLER LLC
    1. Turn the headlamps off.
    2. Turn the ignition off to the lock position.
    3. Disconnect the Rear Headlamp Level Sensor harness connector.
    4. Disconnect the Right HIDL harness connector.
    5. Ignition on, engine not running.
    6. Measure the voltage between ground and the (L962) Headlamp Leveling Sensor Return circuit in the Right HIDL harness connector.

      Is any there voltage present?

      Yes 

      No 

      • Go to step  3
  3. (L961) HEADLAMP LEVELING SENSOR 5 VOLT SUPPLY CIRCUIT SHORTED TO VOLTAGE 
    Fig 2: Checking Headlamp Leveling Sensor 5 Volt Supply Circuit Short To Voltage
    GC0119829Courtesy of CHRYSLER LLC
    1. Measure the voltage between ground and the (L961) Headlamp Leveling Sensor 5 Volt Supply circuit in the Right HIDL harness connector.

      Is any there voltage present?

      Yes 

      No 

      • Go to step  4
  4. (L963) HEADLAMP LEVELING SENSOR REAR SIGNAL CIRCUIT SHORTED TO VOLTAGE 
    Fig 3: Checking Headlamp Leveling Sensor Rear Signal Circuit Shorted To Voltage
    GC0119839Courtesy of CHRYSLER LLC
    1. Measure the voltage between ground and the (L963) Headlamp Leveling Sensor Signal circuit in the Right HIDL harness connector.

      Is any there voltage present?

      Yes 

      No 

      • Go to step  5
  5. (L962) HEADLAMP LEVELING SENSOR RETURN CIRCUIT SHORTED TO GROUND 
    Fig 4: Checking Headlamp Leveling Sensor Return Circuit Shorted To Ground
    GC0119831Courtesy of CHRYSLER LLC
    1. Turn the ignition off to the lock position.
    2. Measure the resistance between ground and the (L962) Headlamp Leveling Sensor Return circuit in the Right HIDL harness connector.

      Is the resistance below 5.0 Ohms?

      Yes 

      No 

      • Go to step  6
  6. (L961) HEADLAMP LEVELING SENSOR 5 VOLT SUPPLY CIRCUIT SHORTED TO GROUND 
    Fig 5: Checking Headlamp Leveling Sensor 5 Volt Supply Circuit Shorted To Ground
    GC0119832Courtesy of CHRYSLER LLC
    1. Measure the resistance between ground and the (L961) Headlamp Leveling Sensor 5 Volt Supply circuit in the Right HIDL harness connector.

      Is the resistance below 5.0 Ohms?

      Yes 

      No 

      • Go to step  7
  7. (L963) HEADLAMP LEVELING SENSOR REAR SIGNAL CIRCUIT SHORTED TO GROUND 
    Fig 6: Checking Headlamp Leveling Sensor Rear Signal Circuit Shorted To Ground
    GC0119840Courtesy of CHRYSLER LLC
    1. Measure the resistance between ground and the (L963) Headlamp Leveling Sensor Signal circuit in the Right HIDL harness connector.

      Is the resistance below 5.0 Ohms?

      Yes 

      No 

      • Go to step  8
  8. (L962) HEADLAMP LEVELING SENSOR RETURN CIRCUIT OPEN OR HIGH RESISTANCE 
    Fig 7: Checking Headlamp Leveling Sensor Return Circuit Open Or High Resistance
    GC0119841Courtesy of CHRYSLER LLC
    1. Measure the resistance of the (L962) Headlamp Leveling Sensor Return circuit between the Rear Headlamp Level Sensor harness connector and the Right HIDL harness connector.

      Is the resistance above 5.0 Ohms?

      Yes 

      No 

      • Go to step  9
  9. (L961) HEADLAMP LEVELING SENSOR 5 VOLT SUPPLY CIRCUIT OPEN OR HIGH RESISTANCE 
    Fig 8: Checking Headlamp Leveling Sensor 5 Volt Supply Circuit Open Or High Resistance
    GC0119842Courtesy of CHRYSLER LLC
    1. Measure the resistance of the (L961) Headlamp Leveling Sensor 5 Volt Supply circuit between the Rear Headlamp Level Sensor harness connector and the Right HIDL harness connector.

      Is the resistance above 5.0 Ohms?

      Yes 

      No 

      • Go to step  10
  10. (L963) HEADLAMP LEVELING SENSOR REAR SIGNAL CIRCUIT OPEN OR HIGH RESISTANCE 
    Fig 9: Checking Headlamp Leveling Sensor Rear Signal Circuit Open Or High Resistance
    GC0119843Courtesy of CHRYSLER LLC
    1. Measure the resistance of the (L963) Headlamp Leveling Sensor Signal circuit between the Rear Headlamp Level Sensor harness connector and the Right HIDL harness connector.

      Is the resistance above 5.0 Ohms?

      Yes 

      No 

      • Go to step  11
  11. REAR HEADLAMP LEVEL SENSOR 
    1. Replace the Rear Headlamp Level Sensor in accordance with the Service Information.

      Perform the BODY VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Front Control (FCM) - Standard Procedure .

    2. Ignition on, engine not running.
    3. With the scan tool, erase DTCs.
    4. Turn the headlamps on.
    5. With the scan tool, read DTCs.

      Does the DTC reset or is the status Active for this DTC?

      Yes 

      No 

      • Test Complete.
  12. INTERMITTENT WIRING HARNESS AND CONNECTORS 
    1. The conditions necessary to set this DTC are not present at this time.
    2. Using the schematics as a guide, inspect the wiring harness and connectors specific to this circuit.
    3. Wiggle test the wiring harness and connectors while monitoring the scan tool data relative to this circuit.
    4. Using the scan tool, monitor the data related to this circuit while performing the wiggle test. Look for the data to change or for the DTC to reset.

      Were there any problems found?

      Yes 

      No 

      • Test Complete.
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