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HOMESERVICE MANUALSDODGE AND RAM2023DURANGO R/T PLUS, RWDREPAIR AND DIAGNOSIS (SINGLE PAGE)ACCESSORIES & EQUIPMENTCOMMUNICATION DEVICESBODY CONTROL MODULE (BCM) - DTCS B16F7-15 TO B2119-11DTC TROUBLESHOOTINGB178E-15-HEADLAMP SWITCH INPUT-CIRCUIT SHORT TO BATTERY OR OPENDIAGNOSTIC TEST
2023 Dodge and Ram Durango R/T Plus, RWD

Diagnostic Test

2023 Dodge and Ram Durango R/T Plus, RWDSECTION Diagnostic Test
  1. CHECK FOR AN ACTIVE DTC 
    1. Turn the ignition on.
    2. Turn the Headlamps on.
    3. 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 (L307) HEADLAMP SWITCH MUX CIRCUIT FOR A SHORT TO VOLTAGE 
    1. Turn the ignition off.
    2. Disconnect the Headlamp Switch harness connector.
    3. Turn the ignition on.
    4. Measure the voltage of the (L307) Headlamp Switch MUX circuit at the Headlamp Switch harness connector.

      Is there any voltage present?

      Yes 

      • Repair the (L307) Headlamp Switch MUX circuit for a short to voltage.
      • Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .

      No 

      • Go To  3
  3. CHECK THE (L307) HEADLAMP SWITCH MUX CIRCUIT FOR AN OPEN 
    1. Turn the ignition off.
    2. Disconnect the BCM C7/G harness connector.
    3. Measure the resistance of the (L307) Headlamp Switch MUX circuit between the Headlamp Switch harness connector and the BCM C7/G harness connector.

      Is the resistance above 3.0 Ohms?

      Yes 

      • Repair the (L307) Headlamp Switch MUX circuit for an open.
      • Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .

      No 

      • Go To  4
  4. CHECK THE (L900) HEADLAMP SWITCH MUX RETURN CIRCUIT FOR AN OPEN 
    1. Measure the resistance of the (L900) Headlamp Switch MUX Return circuit between the Headlamp Switch harness connector and the BCM C7/G harness connector.

      Is the resistance above 3.0 Ohms?

      Yes 

      • Repair the (L307) Headlamp Switch MUX Return circuit for an open.
      • Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .

      No 

      • Go To  5
  5. HEADLAMP SWITCH 
    1. Turn the ignition off.
    2. Reconnect the BCM C7/G harness connector.
    3. Connect a jumper wire between ground and the (L307) Headlamp Switch MUX circuit at the Headlamp Switch harness connector.
    4. Turn the ignition on.
    5. With the scan tool, read the BCM DTCs.

      Does the scan tool display DTC: B178E-11-HEADLAMP SWITCH INPUT - CIRCUIT SHORT TO GROUND?

      Yes 

      No 

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.