Diagnostic Instructions
| • | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
| • | Review Strategy Based Diagnosis for an overview of this diagnostic approach. |
| • | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
DTC Descriptor
DTC C0899 00: Device Voltage Low - EBCMDiagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
B+ | C0899 00 | C0899 00 | -- | -- |
Ground | -- | C0899 00 | -- | -- |
Typical Scan Tool Data
Circuit | Short to Ground | Open | Short to Voltage |
|---|---|---|---|
Operating Conditions: Ignition ON Parameter Normal Value: 12.6 Volts | |||
B+ | 0.0 Volts* | 0.0 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 voltage available on the battery positive (B+) circuit. A low voltage condition prevents the system from operating properly. If the EBCM detects low voltage on the B+ circuit, DTC C0899 00 will set.
Conditions for Running the DTC
| • | The ignition is ON. |
| • | The vehicle speed is greater than 3 km/h (1.8 mph) |
Conditions for Setting the DTC
One of the following conditions exists:
| • | The EBCM detects that the battery voltage is less than 9.5 volts for 10 seconds. |
| • | All wheel speed sensor power supplies have low voltage for 1 minute. |
Action Taken When the DTC Sets
| • | The antilock brake system (ABS), traction control system (TCS) and vehicle stability enhancement system (VSES) are disabled. |
| • | The dynamic rear proportioning (DRP) is disabled, if the battery voltage is less than 8.5 volts. |
| • | The ABS and vehicle dynamics caution (VDC) indicators turn ON. |
| • | The BRAKE indicator turns ON, if the battery voltage is less than 8.5 volts. |
| • | The driver information center (DIC) displays the SERVICE STABILITRAK and SERVICE TRACTION CONTROL messages. |
Conditions for Clearing the DTC
| • | The DTC will pass when the battery voltage is greater than 9.5 volts for 0.22 second. |
| • | The EBCM automatically clears a history DTC when a current DTC is not detected in 100 consecutive ignition cycles. |
Diagnostic Aids
| • | A low voltage DTC in multiple modules indicates a concern in the charging system. |
| • | The warning indicators and DIC messages may turn ON without any DTCs set, if the EBCM detects that the battery voltage is less than 9.5 volts, and the vehicle speed is less than 3 km/h (1.8 mph). |
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 voltage at the battery voltage at the battery terminals. The voltage should be between 12.6 and 15.0 volts.
- Observe the scan tool EBCM Battery Voltage Signal parameter. The reading should be between 12.6 and 15.0 volts.
| ⇒ | If not within the specified range, refer to Charging System Test. |
Circuit/System Testing
- Ignition OFF, disconnect the harness connectors at the EBCM.
- Ignition OFF and scan tool disconnected, open and close the driver door, and wait 1 minute. Test for less than 5 ohms between the ground circuit terminals listed below and ground.
- Verify that a test lamp illuminates between the B+ circuit terminals listed below and ground.
- Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal B X1 and ground.
- If all circuits test normal, replace the EBCM.
| • | Terminal C X1 |
| • | Terminal 1 X2 |
| • | Terminal 32 X2 |
| ⇒ | If greater than the specified range, test the ground circuit for an open/high resistance. |
| • | Terminal A X1 |
| • | Terminal 16 X2 |
| • | Terminal 47 X2 |
| ⇒ | If the test lamp does not illuminate, test the 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.
