Pinpoint Test H: U3003:16

Refer to TURN SIGNAL/STOP/HAZARD LAMPS for schematic and connector information.

Normal Operation and Fault Conditions

The SIMA receives battery voltage at all times from the BCM.

DTC Fault Trigger Conditions

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

Possible Sources

Wiring, terminals or connectors
Charging system concern
Fuse
Battery concern
BCM
SIMA

Visual Inspection and Pre-checks

BCM fuse 31 (10A)

H1 RECHECK THE SIMA (SWITCH INPUT MODULE A) 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 SIMA self-test.

Is DTC U3003:16 still present?

Yes

GO to H2

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.

H2 CHECK FOR CHARGING SYSTEM DIAGNOSTIC TROUBLE CODES (DTCS) SET IN OTHER MODULES
- Using a diagnostic scan tool, retrieve all DTC.
Are any charging system DTCs recorded?

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

No GO to H3

H3 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 H4

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 .

H4 CHECK THE SIMA (SWITCH INPUT MODULE A) VOLTAGE SUPPLY CIRCUIT

Ignition OFF.

Disconnect SIMA C2039.

Ignition ON.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C2039 Pin 1	Courtesy of FORD MOTOR COMPANY	Ground

Is the voltage greater than 11.5 volts?

Yes

GO to H5

No	REPAIR the circuit in question for high resistance.

H5 CHECK THE SIMA (SWITCH INPUT MODULE A) GROUND CIRCUITS

Ignition OFF.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C2039 Pin 7	Courtesy of FORD MOTOR COMPANY	Ground
C2039 Pin 8	Courtesy of FORD MOTOR COMPANY	Ground

Is the resistance less than 3 ohms?

Yes

GO to H6

No	INSPECT G200. INSPECT and REPAIR the circuit in question for high resistance.

H6 CHECK FOR CORRECT SIMA (SWITCH INPUT MODULE A) OPERATION

Disconnect and inspect the SIMA 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 SIMA 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 SIMA. Refer to: Switch Input Module A (SIMA) .

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.