Self-Diagnostics

The Electronic Brake Control Module (EBCM) performs self-diagnostics and can detect and often isolate system malfunctions. When a malfunction is detected, the EBCM sets a Diagnostic Trouble Code (DTC) that represents the malfunction, turns on the ANTILOCK lamp (in most instances), and disables the Four Wheel Antilock (4WAL) functions while the ANTILOCK lamp is on.

The EBCM performs an automatic self-test the first time the vehicle reaches approximately 13 km/h (8 mph) after an ignition cycle. The EBCM cycles the pump motor and each valve to check component operation. If it detects an error, it sets a DTC as described above.