Antilock Brake System (Except North America)
DTC C0800 (Except North America)
Circuit Description
Proper operation of the electronic brake control module (EBCM) requires a certain minimum voltage. The EBCM monitors the ignition feed circuit to determine if the voltage falls below a minimum level.
This test inspects for battery output, proper grounding, blown fuses, faulty ignition switch, and problems in the circuitry.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC C0800 Battery Voltage Out of Range
Conditions for Running the DTC
* Vehicle speed is greater than 6 km/h (4 mph) with the brake pedal not applied
or
* Vehicle speed is greater than 15 km/h (9 mph) and the brake pedal is actuated.
Conditions for Setting the DTC
* The battery is defective.
* There is a defective ground connection.
* A connector is damaged.
* A wire is broken or shorted.
* A fuse is blown.
* The ignition switch is malfunctioning.
Action Taken When the DTC Sets
The antilock brake system (ABS) action is disabled during the period of low voltage, and the ABS warning lamp is ON for the remainder of the ignition cycle. If the failure is intermittent, the EBCM will enable the system at the next ignition cycle and set a history DTC C0800.
Conditions for Clearing the DTC
The condition responsible for setting the DTC no longer exists and the scan tool Clear DTCs function is used.
Diagnostic Aids
It is very important to perform a thorough inspection of the wiring and the connectors. Failure to do so may result in misdiagnosis, causing part replacement with a reappearance of the malfunction.
Test Description
The numbers below refer to the step numbers on the diagnostic table.
2. This step determines whether there is voltage at the battery and at the high current source.
8. This step tests for voltage at the ignition 1 source.
12. This step begins the test for voltage at the EBCM end of the ABS harness.
16. This step inspects for a defective ground connection.
17. This is an inspection for a defective EBCM connector.
