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 DTCs 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.