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Home >> GMC >> 1996 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes >> Diagnostic Trouble Codes >> DTC 1380 - Electronic Brake Control Module (EBCM) DTC Detected Rough Road Data Unusable >> Diagnostic Procedures
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Diagnostic Procedures

  1. Perform On-Board Diagnostic (OBD) System Check. Retrieve and record FREEZE FRAME and/or FAIL RECORDS data for each DTC set. Go to next step.
  2. Disconnect VCM and Electronic Brake Control (EBCM) module connectors. Check for open in serial data circuit between EBCM and VCM. If open is found, go to next step. If open is not found, perform ABS system diagnosis. See appropriate ANTI-LOCK BRAKE SYSTEM article in the BRAKES section.
  3. Repair as necessary and go to next step.
  4. Using scan tool, select DTC, CLEAR INFO function. Start engine and allow it to reach operating temperature. Using scan tool, select DTC, SPECIFIC function and enter DTC P1380. Operate vehicle within conditions required to set DTC. If scan tool displays RAN AND PASSED, go to next step. If scan tool does not display RAN AND PASSED, return to step 2).
  5. Using scan tool, select Read and Record INFO, REVIEW INFO function. If any undiagnosed DTCs are displayed, diagnose affected DTCs. If no DTCs are displayed, system is okay.
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