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Home >> GMC >> 1992 >> Forward Control 5.7 K, Standard >> Repair and Diagnosis (Single Page) >> Transmission >> Automatic Trans >> Diagnosis - A/T >> Testing & Diagnosis (REATTA, Riviera, TORONADO & TROFEO) >> Snapshot >> BCM Snapshot

BCM Snapshot

  1. SNAPSHOT allows recall of system operating specifications present at exact time a BCM malfunction code was set. Up to 3 snapshots may be recalled. In addition, one snapshot may be triggered on demand by depressing FAN UP button (ECCP equipped) or touching YES key (CRT equipped) when TAKE BCM SNAPSHOT? is displayed. To enter snapshot:
    • Enter self-diagnostics. See ENTERING SELF-DIAGNOSTICS .
    • Display trouble codes stored in memory. See DISPLAYING TROUBLE CODES .
    • Select BCM system for testing. See SYSTEM SELECTION .
    • Select SNAPSHOT test type. See TEST TYPE SELECTION .
      NOTE: To cancel a system selection and repeat the system selection process, depress the OFF button on the ECCP for non-CRT equipped vehicles or touch LEVL key on CRT monitor panel for CRT equipped vehicles.
  2. Immediately following selection of SNAPSHOT, system will display BXXX SNAPSHOT. B stands for BCM. XXX represents 3-digit trouble code stored in BCM snapshot. See Figure, Figure, Figure and Figure .
  3. With BXXX displayed, depress FAN DOWN button (ECCP equipped) or touch NO key (CRT equipped) to scroll through list of BCM diagnostic codes for which BCM has stored a snapshot. See DISPLAYING TROUBLE CODES  for list of BCM trouble codes which may be present in snapshot.
    NOTE: A trouble code displayed during trouble code display cycle may not be present as a snapshot trouble code. In this case, exit SNAPSHOT by depressing OFF button (ECCP equipped) or touching LEVL key (CRT equipped). This will return display to next available system selection.
  4. After display of last BCM trouble code for which a snapshot exists, pressing FAN DOWN button (ECCP equipped) or touching NO key (CRT equipped) will result in TAKE BCM SNAPSHOT? display. Responding to this display by depressing FAN DOWN button (ECCP equipped) or touching NO key (CRT equipped) will return display to first BXXX SNAP? display.
  5. Responding to TAKE BCM SNAPSHOT? display by depressing FAN UP button (ECCP equipped) or touching YES key (CRT equipped) with SNAP DATA? or SNAP INPUTS? displayed will select that test type for display.
  6. Display is now controlled as it would be for non-snapshot data and inputs display; however, all values and status information represents memorized vehicle conditions. See SPECIFIC TEST SELECTION .
  7. Depressing FAN UP key (ECCP equipped) or touching YES key (CRT equipped) again with TAKE BCM SNAPSHOT? displayed will change DIC to display SNAP TAKEN message to indicate new information has been stored in memory.
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