Pinpoint Test K: U3003:16

WARNING: This page is about a different car, the 2023 Ford Bronco. However, it is still accessible from the selected car via links, so may be relevant.

Refer to POWER DISTRIBUTION/BCM for schematic and connector information.

Normal Operation and Fault Conditions

The BCMC receives battery voltage at all times from the High Current BJB.

DTC Fault Trigger Conditions

DTC	Description	Fault Trigger Condition
BCMC U3003:16	Battery Voltage: Circuit Voltage Below Threshold	A continuous and on-demand DTC that sets in the BCMC when the BCMC detects lower than expected battery voltage on the voltage supply input circuit.

Possible Sources

Wiring, terminals or connectors
Charging system concern
Battery concern
BCMC

K1 RECHECK THE BCMC (BODY CONTROL MODULE C) DIAGNOSTIC TROUBLE CODES (DTCS)

Connect the diagnostic tool.

Ignition ON.

Using a diagnostic scan tool, clear the DTCs.

Wait 10 seconds.

Using a diagnostic scan tool, perform the BCMC self-test.

Is DTC U3003:16 still present?

Yes

GO to K2

No	The system is operating correctly at this time. The DTC may have been set due to a previous low battery voltage condition. CLEAR the DTC.

K2 CHECK FOR CHARGING SYSTEM DIAGNOSTIC TROUBLE CODES (DTCS) SET IN OTHER MODULES
- Using a diagnostic scan tool, retrieve all
  Continuous Memory Diagnostic Trouble Codes (CMDTCs).
Are any charging system DTCs recorded?

Yes DIAGNOSE and REPAIR these DTCs first. REFER to the appropriate DTC Chart.

No GO to K3

K3 CHECK THE BATTERY CONDITION AND STATE OF CHARGE

Check the battery condition and verify the battery is fully charged. REFER to: Battery .

Is the battery OK and fully charged?

Yes

GO to K4

No	If the battery is discharged, DIAGNOSE the cause of the low battery condition. REFER to: Battery Diagnosis and Testing . If the battery condition fails, INSTALL a new battery. REFER to: Battery Removal and Installation .

K4 CHECK THE BCMC (BODY CONTROL MODULE C) VOLTAGE SUPPLY CIRCUIT

Ignition OFF.

Disconnect High Current BJB C1617C.

Ignition ON.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C1617C Pin 1	Courtesy of FORD MOTOR COMPANY	Ground

IS the voltage greater than 11.5 volts?

Yes

GO to K5

No	REPAIR the circuit in question for high resistance.

K5 CHECK THE BCMC (BODY CONTROL MODULE C) GROUNDS

Ignition OFF.

Disconnect BCMC (BJB) C1035A

Disconnect BCMC (BJB) C1035B.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C1035A Pin 6	Courtesy of FORD MOTOR COMPANY	Ground
C1035B Pin 42	Courtesy of FORD MOTOR COMPANY	Ground

Is the resistance 3 ohms or less?

Yes

GO to K6

No	INSPECT G100 and G201. INSPECT and REPAIR the circuit in question for high resistance.

K6 CHECK FOR CORRECT BCMC (BODY CONTROL MODULE C) OPERATION

Disconnect and inspect the BCMC 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 BCMC 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 service articles: TSB, GSB, SSM or FSA. If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new BCMC. REFER to: Body Control Module C (BCMC) .

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.