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 Descriptors
DTC C0899 00: Device Voltage Low - EBCM 12VDTC C0899 03: Device Voltage Low - EBCM 12V
DTC C12E1 00: Device Voltage Low - EBCM 12V
Diagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
12 V B+ | C0899 00, C0899 03, C12E1 00 | C0899 00, C0899 03, C12E1 00 | C0900 00, C0900 07, C12E2 00 | -- |
Ground | -- | C0899 00, C0899 03, C12E1 00 | -- | -- |
Typical Scan Tool Data
Circuit | Short to Ground | Open | Short to Voltage |
|---|---|---|---|
Operating Conditions: Ignition ON, engine OFF. Parameter Normal Value: 12.6 Volts | |||
12V B+ | 0.0 Volts* | 0.0 Volts* | 12.6 Volts |
*The scan tool will not communicate with the EBCM if there is 0 Volts on the circuit. | |||
Circuit/System Description
The electronic brake control module (EBCM) monitors the 12 V system voltage to make sure that the voltage stays within the proper range. Damage to components, and incorrect data input can occur when the voltage is out of range.
Conditions for Running the DTC
The ignition is ON.
Conditions for Setting the DTC
The 12 V battery voltage available to the EBCM is less than 9 V for 100 msec.
Action Taken When the DTC Sets
| • | The traction control system (TCS) and vehicle stability enhancement system (VSES) are disabled for the duration of the ignition cycle. |
| • | The EBCM requests the MIL to be turned ON. |
| • | The BRAKE indicator turns ON. |
| • | The antilock brake system (ABS) indicator turns ON. |
| • | The vehicle dynamics caution (VDC) indicator turns ON. |
| • | The driver information center (DIC) displays the SERVICE TRACTION CONTROL message. |
| • | The DIC displays the SERVICE STABILITRAK message. |
| • | The DIC displays the SERVICE BRAKES SOON message. |
| • | The ECM sets DTC C12E1 00. |
Conditions for Clearing the DTC
| • | The DTC will pass when the battery voltage is greater than 9.5 V for 100 msec. |
| • | The EBCM automatically clears a history DTC when a current DTC is not detected in 100 consecutive drive cycles. |
| • | The indicators and DIC messages turn OFF when the DTC is cleared, or on the next malfunction-free ignition cycle. |
Diagnostic Aids
A low voltage DTC in multiple modules indicates a concern in the charging system. Refer to DC Power Conversion Test.
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
- Engine running, accessories OFF, measure and record the battery voltage at the 12 V battery terminals. The voltage should be between 12.6-15.0 V.
- Observe the scan tool EBCM Battery Voltage Signal parameter. The reading should be between 12.6-15.0 Volts.
| ⇒ | If not within the specified range, refer to Charging System Test. |
Circuit/System Testing
- Ignition OFF, disconnect the harness connector at the EBCM.
- Ignition OFF and scan tool disconnected, open and close the driver door, and wait 1 minute. Test for less than 5 Ω between the ground circuit terminal 38 and ground.
- Verify that a test lamp illuminates between the 12 V B+ circuit terminal 25 and ground.
- Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal 14 and ground.
- If all circuits test normal, replace the EBCM.
| ⇒ | If greater than the specified range, test the ground circuit for an open/high resistance. |
| ⇒ | If the test lamp does not illuminate, test the 12 V B+ circuit for a short to ground or an open/high resistance. |
| ⇒ | If the test lamp does not illuminate, test the ignition circuit 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.
