Pinpoint Tests: Notes
U3003:16, U300A:29
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 between 10 and 17 volts. The parking brake system requires an operating voltage of 9 volts or higher. The ABS module receives this voltage from the BJB. The ABS module uses a single ground circuit. The ABS module sets this DTC if there is excessive resistance or an open in one or more of these circuits, a discharged battery or an inoperative charging system.
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. |
| U300A:29 | Ignition Switch: Signal Invalid | This DTC sets in continuous memory and on-demand if the ABS module receives the power mode or ignition status message from the PCM and BCM, but does not receive the hard-wired ignition switch input. |
Possible Causes
- Fuses
- Wiring, terminals or connectors
- 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 5 (50A), 28 (30A) and 62 (5A) are OK.