Pinpoint Test - DTC: AJ — 2016 workshop reference 2042

Start the engine. Measure the voltage of the battery. For DTC U3003:17, turn off all accessories while measuring the battery voltage. For DTC U3003:16, turn on headlights and HVAC fan on high while measuring the battery voltage.

Is the voltage between 13 and 15.2 volts?

Yes	For DTC U3003:16, GO to A4 For DTC U3003:17, GO to A6
No	DIAGNOSE the charging system. Refer to the appropriate section in Group 414 for the procedure. CLEAR all Continuous Memory Diagnostic Trouble Codes (CMDTCs).

A4 CHECK FOR OPEN IGNITION CIRCUIT TO THE MODULE

Ignition OFF. Depower the SRS. Refer to REFER to: Supplemental Restraint System (SRS) Depowering (501-20B Supplemental Restraint System, General Procedures). Disconnect the module with the concern:

For the RCM, disconnect C310A and C310B. For the OCSM, disconnect C3159.

For the RCM, measure:

Click to display connectors

Positive Lead	Measurement / Action	Negative Lead
C310A-19		C2280A-4

For the OCSM, measure:

Click to display connectors

Positive Lead	Measurement / Action	Negative Lead
C3043-1		C2280C-23

Is the resistance less than 1 ohm?

Yes	GO to A5
No	REPAIR the circuit as necessary. Refer to Wiring Diagrams Cell 5 for schematic and connector information. CLEAR all Continuous Memory Diagnostic Trouble Codes (CMDTCs).

A5 CHECK FOR OPEN GROUND TO THE MODULE

For the RCM, measure:

Click to display connectors

Positive Lead	Measurement / Action	Negative Lead
RCM mounting bracket		Ground

For the OCSM, measure:

Click to display connectors

Source reference 2042

2016 Mustang workshop publication supplied to Mustang Atlas. Original technical text and illustrations; HTML formatting by Mustang Atlas. Source page numbering is retained for traceability. Follow the configuration, revision, warnings, and cross-references in the material. About this edition.