C1604
DTC C1604
Circuit Description
This DTC identifies a possible malfunction within the electronic brake control module (EBCM).
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC C1604 ECU Malfunction
Conditions for Running the DTC
Ignition is in the ON position.
Conditions for Setting the DTC
DTC C1604 will set when a possible internal component/microprocessor problem may exist.
Action Taken When the DTC Sets
^ DTC C1604 is stored.
^ The ABS and DDRP are disabled
^ The ABS warning lamp and brake warning lamp are turned ON.
^ The solenoid relay opens, removing power from the pump motor and solenoids.
Conditions for Clearing the DTC
^ If the conditions that set DTC C1604 are no longer present, the DTC may be cleared by using the proper scan tool.
^ The DTC that has not occurred in 100 drive cycles will be cleared from the history data.
Diagnostic Aids
^ When DTC C1604 is displayed on the scan tool, it should be followed by 2 additional numbers, which should be documented along with any other DTC's that may be displayed.
^ Repair the low voltage, driveability, or other electrical complaints first, prior to performing DTC C1604.
^ Ensure the integrity of the connection between the EBCM and the brake pressure modulator valve (BPMV) is secure, tight, and free of corrosion, leaks, and/or damage.
