The electronic brake control module (EBCM) is wired to the ignition 1 voltage circuit to indicate the ignition ON/OFF state. The EBCM monitors this voltage to ensure the voltage remains within an acceptable operating range.
This diagnostic procedure supports the following DTC:
DTC C0899 Device (Single or 1) Voltage Low
• | The ignition is ON. |
• | The vehicle speed is greater than 20 km/h (13 mph). |
The EBCM detects low ignition voltage for greater than 224 milliseconds.
If equipped, the following actions occur:
• | The EBCM disables the antilock brake system (ABS)/traction control system (TCS). |
• | The ABS indicator turns ON. |
• | The traction off indicator turns ON. |
The conditions for setting the DTC are no longer present and you use the scan tool Clear DTCs function.
Several charging system related malfunctions may cause this DTC to set intermittently. Refer to the Engine Electrical section for further diagnostic aids.
The number below refers to the step number on the diagnostic table.
Step | Action | Values | Yes | No |
---|---|---|---|---|
Schematic Reference: Antilock Brake System Schematics | ||||
1 | Did you perform the Diagnostic System Check - Vehicle? | -- | Go to Step 2 | |
2 |
Does the DTC set? | -- | Go to Step 3 | Go to Diagnostic Aids |
Does the resistance measure within the specified range? | 0-0.2 ohms | Go to Step 5 | Go to Step 4 | |
4 | Repair the high resistance in the ignition 1 voltage circuit. Refer to Circuit Testing and Wiring Repairs . Did you complete the repair? | -- | Go to Step 7 | -- |
5 | Inspect for poor connections at the harness connector of the EBCM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | -- | Go to Step 7 | Go to Step 6 |
6 | Replace the EBCM. Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement? | -- | Go to Step 7 | -- |
7 |
Does the DTC reset? | -- | Go to Step 3 | System OK |