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Home >> Cadillac >> 2007 >> STS V >> Repair and Diagnosis >> Brakes >> Antilock Brake System, Traction Control System & Stability Control System >> Diagnostic Information and Procedures >> DTC C0820 >> Test Description

Test Description

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

  1. 3:  Tests the ability of the EBCM to control the pump motor. If the test lamp illuminates, the pump motor circuit within the EBCM is good.
DTC C0820

Step Action Yes No
Schematic Reference: Antilock Brake System Schematics 
Connector End View Reference: Antilock Brake System 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?		 Go to Step 3  Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems
3 
  1. Turn OFF the ignition.
  2. Disconnect the pump motor harness pigtail connector of the brake pressure modulator valve (BPMV).
  3. Connect a test lamp between the pump motor circuits at the pump motor connector of the electronic brake control module (EBCM) using the J 35616  Connector Test Adapter Kit. See Special Tools .
  4. Use the scan tool in order to clear the DTCs.
  5. With the scan tool, perform the Pump Motor Test.
Does the test lamp illuminate?		 Go to Step 5  Go to Step 4 
4
  1. Turn OFF the ignition.
  2. Disconnect the EBCM harness connector.
  3. Connect the J 39700  Universal Pinout Box using the J 39700-300  Cable Adapter to the EBCM harness connector only. See Special Tools .
  4. Test both ground circuits of the EBCM including the EBCM ground for a high resistance or an open. Refer to Circuit Testing andWiring Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 9  Go to Step 6 
5 Inspect for poor connections at the pump motor harness pigtail connector of the BPMV. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 9  Go to Step 7 
6 Inspect for poor connections at the harness connector of the EBCM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 9  Go to Step 8 
7 Replace the BPMV. Refer to Brake Pressure Modulator Valve Replacement .
Did you complete the repair?		 Go to Step 9  -
8 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 9  -
9
  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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