Pinpoint Test A : U3003:13, U3003:16, U300E:13: Notes

Refer to Vehicle Dynamic Systems for schematic and connector information.

Normal Operation and Fault Conditions

The ABS module, hydraulic pump and solenoid valves require an operating voltage that is between 10 and 17 volts. The ABS module receives this voltage from the BJB. The ABS module has a single ground circuit located in the engine compartment wiring harness. Excessive resistance or an open in one or more of these circuits, a discharged battery or a inoperative charging system results in the ABS module setting a DTC.

DTC Fault Trigger Conditions

DTC	Description	Fault Trigger Conditions
U3003:16	Battery Voltage: Circuit Voltage Below Threshold	This DTC sets in continuous memory and on-demand if the voltage supplied to the ABS module falls below 10 volts.
U3003:13	Battery Voltage: Circuit Open	This DTC sets in continuous memory and on-demand if the power latch mode counter reaches a predetermined number.
U300E:13	Ignition Input On: Circuit Open	This DTC sets in continuous memory if the power mode message from the BCM indicates the ignition is ON, but the ignition voltage supplied to the ABS module is missing.

Possible Causes

Fuses
Wiring, terminals or connectors
Charging system concern
Battery
ABS module

Visual Inspection and Diagnostic Pre-checks

Make sure the vehicle battery terminals and cables are free of any corrosion and other contaminants.
Make sure the vehicle battery terminals are tightened to their correct torque specifications.
Make sure BJB fuses 7 (40A), 8 (30A) and 19 (5A) are OK.