For 1990-2009 cars only
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. |
DTC Descriptor
DTC C0201 00: Antilock Brake System (ABS) Enable Relay Contact CircuitCircuit/System Description
The EBCM controls it's internal valve relay to command the valve solenoids ON or OFF.
Conditions for Running the DTC
| • | Ignition voltage is greater than 10 volts. |
| • | The solenoid relay is commanded ON. |
Conditions for Setting the DTC
| • | The EBCM detects no change when commanding the valve relay ON or OFF. |
| • | The EBCM detects a stuck open solenoid valve relay or an open circuit between the solenoid valve relay and solenoid valves. |
Action Taken When the DTC Sets
| • | The EBCM disables the antilock brake system (ABS)/traction control system (TCS). |
| • | A DIC message and/or a warning indicator may be displayed. |
Conditions for Clearing the DTC
| • | The condition for setting the DTC is no longer present. |
| • | The EBCM clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles. |
Reference Information
Schematic Reference
Antilock Brake System Schematics
Connector End View Reference
Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
Ignition ON, observe the scan tool EBCM Battery Voltage Signal parameter. The reading should be battery voltage.
Circuit/System Testing
- Ignition OFF, disconnect the harness connector at the EBCM.
- Test for less than 2 ohm of resistance between the ground terminals 38 and 12 to ground.
- Verify that a test lamp illuminates between the B+ terminals 25 and 13 and ground.
- If all circuits test normal, replace the EBCM.
| ⇒ | If greater than the specified range, test the ground circuits for an open/high resistance. |
| ⇒ | If the test lamp does not illuminate, test the B+ circuits for a short to ground or an open/high resistance. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for EBCM replacement, setup, and programming
