Circuit Description
The class 2 serial data line allows all of the modules on the line to
transmit information to each other as needed. Each module is assigned an ID. All
of the information sent out on the line is assigned a priority by which it is received.
When the ignition is turned ON, each module begins to send and receive information.
Each module on the class 2 serial data line knows what information the module
needs to send out and what information the module should be receiving. What the modules
do not know is which module is supposed to send the information. This information
is only learned after the module has received the information needed along with
the ID of the module that sent the information. This information is then remembered
until the ignition switch is turned off.
Conditions for Running the DTC
The Antilock Brake System (ABS) conditions and the braking conditions are normal.
Conditions for Setting the DTC
The powertrain control module (PCM) does not receive any messages from the electronic
brake control module (EBCM) for 7 seconds.
Action Taken When the DTC Sets
| • | The EBCM disables the Traction Control System (TCS) for the duration of
the ignition cycle. |
| • | The TRACTION CONTROL indicator turns ON. |
| • | The ABS remains functional. |
Conditions for Clearing the DTC
| • | The condition for the DTC is no longer present and the DTC is cleared
with a scan tool. |
| • | The EBCM automatically clears the history DTC when a current DTC is not
detected in 100 consecutive drive cycles. |
Diagnostic Aids
| • | Diagnose and repair all U codes. |
| • | DTC C1298 will clear after U codes are repaired. |
