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.
2018 Ford Mustang EcoBoost, 2D Convertible, Automatic TransFACTORY OEM SERVICE PROCEDURE
Exterior Lighting System DTCS: Headlamps: BCM
DTC INDEX
| DTC | Description | Action |
|---|---|---|
| B143B:11 | Autolamp On Input: Circuit Short to Ground | GO to PINPOINT TEST D : ONE OR BOTH LOW BEAMS ARE ON CONTINUOUSLY |
| B143C:11 | Headlamp Off Input: Circuit Short to Ground | GO to PINPOINT TEST D : ONE OR BOTH LOW BEAMS ARE ON CONTINUOUSLY |
| B143D:11 | Headlamp On Input: Circuit Short to Ground | GO to PINPOINT TEST D : ONE OR BOTH LOW BEAMS ARE ON CONTINUOUSLY |
| B143E:11 | Headlamp Switch Input: Circuit Short to Ground | GO to PINPOINT TEST D : ONE OR BOTH LOW BEAMS ARE ON CONTINUOUSLY |
| B1447:11 | Parklamp On Switch Input: Circuit Short to Ground | GO to PINPOINT TEST D : ONE OR BOTH LOW BEAMS ARE ON CONTINUOUSLY |
| B1D00:11 | Left Low Beam: Circuit Short to Ground | Except China, GO to PINPOINT TEST A : ONE OR BOTH LOW BEAMS IS INOPERATIVE - EXCEPT CHINA China only, GO to PINPOINT TEST B : ONE OR BOTH LOW BEAMS IS INOPERATIVE - CHINA ONLY |
| B1D00:15 | Left Low Beam: Circuit Short to Battery or Open | Except China, if the low beam is inoperative, GO to PINPOINT TEST A : ONE OR BOTH LOW BEAMS IS INOPERATIVE - EXCEPT CHINA China only, if the low beam is inoperative, GO to PINPOINT TEST B : ONE OR BOTH LOW BEAMS IS INOPERATIVE - CHINA ONLY If the low beam is always on, GO to PINPOINT TEST D : ONE OR BOTH LOW BEAMS ARE ON CONTINUOUSLY |
| B1D01:11 | Right Low Beam: Circuit Short to Ground | Except China, GO to PINPOINT TEST A : ONE OR BOTH LOW BEAMS IS INOPERATIVE - EXCEPT CHINA China only, GO to PINPOINT TEST B : ONE OR BOTH LOW BEAMS IS INOPERATIVE - CHINA ONLY |
| B1D01:15 | Right Low Beam: Circuit Short to Battery or Open | Except China, if the low beam is inoperative, GO to PINPOINT TEST A : ONE OR BOTH LOW BEAMS IS INOPERATIVE - EXCEPT CHINA China only, if the low beam is inoperative, GO to PINPOINT TEST B : ONE OR BOTH LOW BEAMS IS INOPERATIVE - CHINA ONLY If the low beam is always on, GO to PINPOINT TEST D : ONE OR BOTH LOW BEAMS ARE ON CONTINUOUSLY |
| B1D02:11 | Left High Beam Circuit: Circuit Short to Ground | GO to PINPOINT TEST C : ONE OR BOTH HIGH BEAMS IS INOPERATIVE |
| B1D02:15 | Left High Beam Circuit: Circuit Short to Battery or Open | If the high beam is inoperative, GO to PINPOINT TEST C : ONE OR BOTH HIGH BEAMS IS INOPERATIVE If the high beam is always on, GO to PINPOINT TEST E : ONE OR BOTH HIGH BEAMS ARE ON CONTINUOUSLY |
| B1D03:11 | Right High Beam Circuit: Circuit Short to Ground | GO to PINPOINT TEST C : ONE OR BOTH HIGH BEAMS IS INOPERATIVE |
| B1D03:15 | Right High Beam Circuit: Short to Battery or Open | If the high beam is inoperative, GO to PINPOINT TEST C : ONE OR BOTH HIGH BEAMS IS INOPERATIVE If the high beam is always on, GO to PINPOINT TEST E : ONE OR BOTH HIGH BEAMS ARE ON CONTINUOUSLY |
| U1000:00 | Solid State Driver Protection Active -Driver Disabled: No Sub Type Information | The module has temporarily disabled an output because an excessive current draw exists (such as a short to ground). The BCM cannot enable the output until the cause of the short is corrected. ADDRESS all other Diagnostic Trouble Codes (DTCs) first. After the cause of the concern is corrected, CLEAR the Diagnostic Trouble Codes (DTCs). REPEAT the self-test. |
| U3000:49 | Control Module: Internal Electronic Failure | The module has permanently disabled an output because an excessive current draw fault (such as a short to ground) has exceeded the limits that the BCM can withstand. The cause of the excessive current draw MUST be corrected before a new BCM is installed. ADDRESS all other Diagnostic Trouble Codes (DTCs) first. After the cause of the concern is corrected, Refer to BCM GUIDED ROUTINE TESTING |
| All other BCM Diagnostic Trouble Codes (DTCs) | - | REFER to: Body Control Module (BCM) . |
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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