C0196 00 (continued 2) Cadillac STS I

Circuit Description

The dynamic rear proportioning (DRP) is a control system that replaces the hydraulic proportioning function of the mechanical proportioning valve in the base brake system. The DRP control system is part of the operating software in the EBCM. The DRP uses active control with the existing ABS in order to regulate the vehicle's rear brake pressure.

DTC Descriptor

This diagnostic procedure supports the following DTC

DTC C0281 DRP Performance

Conditions for Running the DTC

One or more faults have been detected by the EBCM in the ABS/TCS systems.

Conditions for Setting the DTC

One of the following conditions exists

1. DTC C0121, C0113, C0114, C0115, C0900, or C0550 sets.
2. Two wheel speed sensor DTCs on the same axle set.

Action Taken When the DTC Sets

1. The EBCM disables the DRP for the duration of the ignition cycle.
2. The red Brake warning indicator turns ON.

Conditions for Clearing the DTC

1. The condition for the DTC is no longer present and the DTC is cleared with a scan tool.
2. The electronic brake control module (EBCM) automatically clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles.

Diagnostic Aids

This DTC is for information only. As an aid to the technician, this DTC indicates that another DTC exists that fails DRP.

Test Description

The number below refers to the step number on the diagnostic table.

1. 2: Verifies whether other ABS/TCS/VSES DTCs are set.

DTC C0281

The electronic brake control module (EBCM) detects an internal malfunction or loss of ground.

This diagnostic procedure supports the following DTC

DTC C0550 Electronic Control Unit Performance

The ignition switch is in the ON position.

1. An internal EBCM malfunction exists.
2. System voltage is less than half the ignition voltage continuously for 0.04 seconds.

If equipped, the following actions occur

1. The ABS/ACC/DRP/EDC/IVC/TPM/VES/VSES are disabled.
2. TCS is degraded.
3. The ABS/TCS indicators turn ON.
4. The red BRAKE Warning indicator turns ON.

The DIC displays the following

1. Service ABS
2. Service Traction System
3. Service Stabilitrak
4. Service Radar Cruise

1. The condition for the DTC is no longer present and the DTC is cleared with a scan tool.
2. The EBCM automatically clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles.

Possible causes of this DTC

1. Open ground at the EBCM
2. Internal malfunction in the EBCM

The number below refer to the step number on the diagnostic table.

1. 2: Tests for a proper ground to the EBCM.

DTC C0550

When the electronic brake control module (EBCM) is replaced, software and calibrations are flash programmed into the EBCM. The EBCM receives the vehicle powertrain options information from the powertrain control module (PCM) in order for the EBCM to automatically calibrate to the vehicle.

This diagnostic procedure supports the following DTC

DTC C0551 Option Configuration Error

1. The ignition is ON.
2. Ignition voltage is greater than 8 volts.

One or more of the following conditions are present

1. The incorrect EBCM is installed on the vehicle.
2. The incorrect software or calibrations have been flash programmed into the EBCM.

If equipped, the following actions occur

1. The EDC/TCS are disabled.
2. The TCS indicator turns ON.

The DIC displays the Service Traction System message.

1. The condition for the DTC is no longer present and the DTC is cleared with a scan tool.
2. The electronic brake control module (EBCM) automatically clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles.

If the DTC was set after EBCM replacement, verify that the replacement EBCM and software are correct for the vehicle.

DTC C0551