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Home >> Cadillac >> 2005 >> SRX 4.6 A, AWD >> Repair and Diagnosis >> Brakes >> Antilock Brake System, Traction Control System & Stability Control System >> Diagnostic Information and Procedures >> DTC C0121 >> Test Description

Test Description

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

  1. 2:  Determines whether the DTC is current.
DTC C0121

Step Action Values Yes No
Schematic Reference: ABS Schematics 
Connector End View Reference: ABS Connector End Views 
1 Did you perform the Diagnostic System Check - Vehicle? - Go to Step 2  Go to Diagnostic System Check - Vehicle in Vehicle DTC Information
2 
  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
  3. Use the scan tool in order to clear the DTCs.
  4. With the scan tool, perform the Automated Test.
Does the DTC reset as a current DTC?		 - Go to Step 3  Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems
3
  1. Disconnect the pump motor harness pigtail connector of the brake pressure module valve (BPMV).
  2. Measure the resistance between each pump motor control circuit and the housing of the BPMV at the pump motor harness pigtail connector of the BPMV.
Does the DMM display the specified value?		 OL Go to Step 5  Go to Step 4 
4 Replace the electronic brake control module (EBCM) and the BPMV. Refer to Electronic Brake Control Module Replacement  and Brake Pressure Modulator Valve (BPMV) Replacement .
Did you complete the replacement?		 - Go to Step 6  -
5 Replace the EBCM. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming.
Did you complete the replacement?		 - Go to Step 6  -
6
  1. Use the scan tool in order to clear the DTCs.
  2. With the scan tool, perform the Automated Test.
Does the DTC reset?		 - Go to Step 2  System OK
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