LEMON Manuals: Even more car manuals for everyone
Home >> Jeep >> 2017 >> Wrangler Sahara, Automatic Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 68 ((Automatic Headlamp Leveling Module (AHLM) - Electrical Diagnostics)) >> DTC Troubleshooting >> B167C-29-Front Headlamp Leveling Sensor-Signal Invalid >> Diagnostic Test

Diagnostic Test

WARNING: This page is about a different car, the 2017 Jeep Cherokee. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK FOR AN ACTIVE DTC 
    1. With the scan tool, read the Body Control Module (BCM) DTCs and record on the repair order.

      Is the DTC active?

      Yes 

      • Go To  2

      No 

      • 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. If no problems are found, test complete.
      • Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  2. CHECK THE HEADLAMP LEVEL SENSORS 
    1. Turn the ignition off.
    2. Disconnect the Front Headlamp Level Sensor harness connector.
    3. Turn the ignition on.
    4. With the scan tool, read the BCM DTCs.

      Is the DTC active?

      Yes 

      • Go To  3

      No 

      • Replace the headlamp level sensor in accordance with the Service Information.
      • Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  3. CHECK THE (L960) HEADLAMP LEVELING SENSOR FRONT SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE 
    1. Measure the voltage of the (L960) Headlamp Leveling Sensor Front Signal circuit at the Front Headlamp Level Sensor harness connector.

      Is the voltage greater than 10.5 volts?

      Yes 

      • Repair the (L960) Headlamp Leveling Sensor Front Signal circuit for a short to voltage.
      • Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .

      No 

      • Go To  4
  4. (L963) HEADLAMP LEVELING SENSOR REAR SIGNAL CIRCUIT SHORTED TO VOLTAGE 
    1. Measure the voltage of the (L963) Headlamp Leveling Sensor Rear Signal circuit at the Front Headlamp Level Sensor harness connector.

      Is the voltage greater than 10.5 volts?

      Yes 

      • Repair the (L963) Headlamp Leveling Sensor Rear Signal circuit for a short to voltage.
      • Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .

      No 

      • Go To  5
  5. CHECK THE (L960) HEADLAMP LEVELING SENSOR FRONT SIGNAL CIRCUIT FOR A SHORT TO GROUND 
    1. Turn the ignition off.
    2. Check for continuity between ground and the (L960) Headlamp Leveling Sensor Front Signal circuit at the Front Headlamp Level Sensor harness connector.

      Is there continuity between ground and the (L960) Headlamp Leveling Sensor Front Signal circuit?

      Yes 

      • Repair the (L960) Headlamp Leveling Sensor Front Signal circuit for a short to ground.
      • Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .

      No 

      • Go To  6
  6. CHECK THE (L963) HEADLAMP LEVELING SENSOR REAR SIGNAL CIRCUIT FOR A SHORT TO GROUND 
    1. Check for continuity between ground and the (L963) Headlamp Leveling Sensor Rear Signal circuit at the Front Headlamp Level Sensor harness connector.

      Is there continuity between ground and the (L963) Headlamp Leveling Sensor Rear Signal circuit?

      Yes 

      • Repair the (L963) Headlamp Leveling Sensor Rear Signal circuit for a short to ground.
      • Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .

      No 

      • Go To  7
  7. CHECK THE (L960) HEADLAMP LEVELING SENSOR FRONT SIGNAL CIRCUIT FOR AN OPEN 
    1. Disconnect the Automatic Headlamp Leveling Module (AHLM) harness connector.
    2. Measure the resistance of the (L960) Headlamp Leveling Sensor Front Signal circuit between the Automatic Headlamp Leveling Module (AHLM) harness connector and the Front Headlamp Level Sensor harness connector.

      Is the resistance above 3.0 Ohms?

      Yes 

      • Repair the (L960) Headlamp Leveling Sensor Front Signal circuit for an open or high resistance.
      • Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .

      No 

      • Go To  8
  8. CHECK THE (L963) HEADLAMP LEVELING SENSOR REAR SIGNAL CIRCUIT FOR AN OPEN 
    1. Measure the resistance of the (L963) Headlamp Leveling Sensor Rear Signal circuit between the Automatic Headlamp Leveling Module (AHLM) harness connector and the Front Headlamp Level Sensor harness connector.

      Is the resistance above 3.0 Ohms?

      Yes 

      • Repair the (L963) Headlamp Leveling Sensor Rear Signal circuit for an open or high resistance.
      • Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .

      No 

scientia non olet · About LEMON Manuals