System Pre-Checks

Connector Diagram:

DESCRIPTION
If no vehicle battery voltage is available to the anti-lock brake control module, or the voltage available is less than 9.5 volts, the anti-lock brake control module cannot initialize. As a result, the system relay cannot be energized and the ABS warning light remains on. No diagnostics are possible; therefore, no codes can be read.

Possible Contributing Base Brake Component/Vehicle Wiring Concerns
- Worn or damaged ignition switch
- Open ignition feed circuit to anti-lock brake control module
- Low battery voltage (less than 8V)
- Blown ignition fuse
- Open system ground
- Poor ground connection Circuit 570 (BK/W)
- B+ short on Circuit 70 (LB/W)
- Ground short on Circuit 601 (LB/PK) (fuse 14 blown).