Pinpoint Test A : The DRL (Daytime Running Lamps) Are Inoperative - Led (Light Emitting Diode) Headlamps
WARNING: This page is about a different car, the 2019 Ford F-550 Super Duty, 2019 Ford F-450 Super Duty, 2019 Ford F-350 Super Duty, and 2019 Ford F-250 Super Duty. However, it is still accessible from the selected car via links, so may be relevant.
The DRL Are Inoperative - LED Headlamps
Refer to Headlamps/Autolamps for schematic and connector information.
Normal Operation and Fault Conditions
REFER to: Exterior Lighting - Overview .
REFER to: Exterior Lighting - System Operation and Component Description .
DTC Fault Trigger Conditions
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| B124A:11 | Right Daytime Running Light: Circuit Short To Ground | A continuous memory and on-demand DTC that sets when the BCM detects a short to ground from the RHDRL voltage supply circuit. |
| B124A:15 | Right Daytime Running Light: Circuit Short To Battery or Open | A continuous memory and on-demand DTC that sets when the BCM detects an open or short to voltage from the RHDRL voltage supply circuit. |
| B124B:11 | Left Daytime Running Light: Circuit Short To Ground | A continuous memory and on-demand DTC that sets when the BCM detects a short to ground from the LHDRL voltage supply circuit. |
| B124B:15 | Left Daytime Running Light: Circuit Short To Battery or Open | A continuous memory and on-demand DTC that sets when the BCM detects an open or short to voltage from the LHDRL voltage supply circuit. |
| U1000:00 | Solid State Driver Protection Active -Driver Disabled: No Sub Type Information | This DTC sets when the BCM has temporarily shut down the output driver. 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, the Diagnostic Trouble Codes (DTCs) have been cleared and a successful self-test is run. |
| U3000:49 | Control Module: Internal Electronic Failure | This DTC sets when the BCM has permanently shut down the output driver. 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. CORRECT the cause of the excessive current draw before installing a new BCM. |
Possible Sources
- Wiring, terminals or connectors
- Headlamp assembly
- LED control module
- BCM
NOTE:
Before beginning this test, refer to Description And Operation
for proper DRL operation.
- A1 CHECK THE DRL (DAYTIME RUNNING LAMPS) CIRCUIT FOR VOLTAGE
- Place the headlamp switch in the OFF position.
- Ignition OFF.
- Disconnect: Inoperative LH Headlamp C1284 or RH Headlamp C1285.
- Ignition ON.
- Make sure the DRL are enabled through the IPC.
- Make sure there is enough ambient lighting that the autolamps system will not automatically illuminate the headlamps.
- Place the headlamp switch in the AUTOLAMPS position.
- Measure:
LH Headlamp
Positive Lead Measurement / Action Negative Lead C1284-4 Ground RH Headlamp
Positive Lead Measurement / Action Negative Lead C1285-4 Ground
Is the voltage greater than 11 volts?
Yes INSTALL a new headlamp assembly. REFER to: Headlamp Assembly . No GO to A2 - A2 REPEAT THE ON-DEMAND SELF-TEST AND CHECK THE DRL (DAYTIME RUNNING LAMPS) CIRCUIT FOR VOLTAGE
- Using a diagnostic scan tool, perform the BCM self-test.
- Clear the Diagnostic Trouble Codes (DTCs) and repeat the self-test (required to enable the lamp output driver if DTC U1000:00 is present).
- Measure:
LH Headlamp
Positive Lead Measurement / Action Negative Lead C1284-4 Ground RH Headlamp
Positive Lead Measurement / Action Negative Lead C1285-4 Ground
Is the voltage greater than 11 volts?
Yes INSTALL a new headlamp assembly. REFER to: Headlamp Assembly . No GO to A3 - A3 CHECK THE DRL (DAYTIME RUNNING LAMPS) CIRCUIT FOR A SHORT TO GROUND
- Place the headlamp switch in the OFF position.
- Ignition OFF.
- Disconnect: BCM C2280F.
- Measure:
LH Headlamp
Positive Lead Measurement / Action Negative Lead C1284-4 Ground RH Headlamp
Positive Lead Measurement / Action Negative Lead C1285-4 Ground
Is the resistance greater than 10, 000 ohms?
Yes GO to A4 No REPAIR the circuit. After the repair: If no Diagnostic Trouble Codes (DTCs) are present, TEST the system for normal operation. If DTC U1000:00 is present, CLEAR the Diagnostic Trouble Codes (DTCs) and REPEAT the self-test (required to enable the lamp output driver if DTC U1000:00 is present). Refer to BCM Guided Routine . - A4 CHECK THE DRL (DAYTIME RUNNING LAMPS) CIRCUIT FOR AN OPEN
- Measure:
LH Headlamp
Positive Lead Measurement / Action Negative Lead C1284-4 C2280F-40 RH Headlamp
Positive Lead Measurement / Action Negative Lead C1285-4 C2280F-36
Is the resistance less than 3 ohms?
Yes GO to A5 No REPAIR the circuit. - Measure:
- A5 CHECK FOR CORRECT BCM (BODY CONTROL MODULE) OPERATION
- Disconnect and inspect all BCM connectors.
- Repair:
- corrosion (install new connector or terminals - clean module pins)
- damaged or bent pins - install new terminals/pins
- pushed-out pins - install new pins as necessary
- Reconnect the BCM connectors. Make sure they seat and latch correctly.
- Operate the system and determine if the concern is still present.
Is the concern still present?
Yes CHECK OASIS for any applicable Technical Service Bulletins (TSBs). If a TSB exists for this concern, DISCONTINUE this test and FOLLOW TSB instructions. If no Technical Service Bulletins (TSBs) address this concern, Refer to BCM Guided Routine . No The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.