Diagnostic Instructions
| • | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
| • | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
| • | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
Circuit/System Description
The electronic brake control module (EBCM) illuminates the Bendix Remote Diagnostic Unit (RDU) voltage supplied to the EBCM is less than 9 volts or when the EBCM detects an internal malfunction.
Conditions for Running the Diagnostic Fault
The ignition is ON.
Conditions for Setting the Diagnostic Fault
Either of the following conditions may cause the Bendix Remote Diagnostic Unit (RDU) to illuminate the ECU LED.
| • | The voltage supplied to the EBCM drops below 9 volts rendering the EBCM inoperative. |
| • | The EBCM detects an internal malfunction. |
Action Taken When the Diagnostic Fault Sets
| • | The Bendix Remote Diagnostic Unit (RDU), illuminates the ECU (ABS Controller) LED. |
| • | The ABS indicator lamp turns ON. |
| • | The ABS function is disabled. |
Conditions for Clearing the Diagnostic Fault
| • | Repair the condition responsible for illuminating the status lamps. |
| • | Perform the Status Lamp Resetting procedure. Refer to Status Lamp Resetting. |
Diagnostic Aids
Important: Upon replacing the electronic brake control module (EBCM) perform the Bendix RDU magnet reset procedure. Refer to Status Lamp Resetting.
Reference Information
Schematic Reference
Air Antilock Brake System Schematics
Connector End View Reference
Description and Operation
Air ABS Description and Operation
Electrical Information Reference
Scan Tool Reference
Circuit/System Verification
Verify that the diagnostic fault EBCM programming is not set.
| ⇒ | If the diagnostic fault is set, program the EBCM. If the diagnostic fault resets, replace the EBCM. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for EBCM replacement, setup, and programming
