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Home >> Buick >> 1991 >> Reatta 2D Convertible >> Repair and Diagnosis >> Electrical >> Charging Systems >> Alternator & Regulator >> Self-Diagnostics >> BCM Snapshot

BCM Snapshot

NOTE: If directed here from TEST SELECTION under MANUAL OPERATION OF SELF-DIAGNOSTICS, go to step 2).
  1. SNAPSHOT allows the recall of system operating specifications when BCM malfunction code was set. Up to 3 snapshots may be recalled. In addition, one snapshot may be triggered on demand. To enter snapshot complete the following:
    • Enter self-diagnostics. See ENTERING SELF-DIAGNOSTICS under SELF-DIAGNOSTICS.
    • Display trouble codes stored in memory. See DISPLAYING TROUBLE CODES under SELF-DIAGNOSTICS.
    • Select BCM or ECM system (as desired) for testing. See SYSTEM SELECTION under MANUAL OPERATION OF SELF-DIAGNOSTICS.
    • Select SNAPSHOT test type. See TEST SELECTION under MANUAL OPERATION OF SELF-DIAGNOSTICS.
      NOTE: To cancel snapshot test type selection and repeat test type selection process, depress the OFF button on ECC panel.
  2. Immediately following the selection of SNAPSHOT?, the system will display BXXX. B stands for BCM. XXX is used here to represent the 3-digit code stored in BCM snapshot.
  3. With BXXX displayed, depressing the FANO button on the ECC panel will permit scrolling through the list of BCM diagnostic codes for which the BCM has stored a snapshot. For a list of BCM charging system trouble codes that may be present in snapshot, see BCM CHARGING SYSTEM TROUBLE CODES under SELF-DIAGNOSTICS.
    NOTE: A trouble code displayed during the trouble code display cycle CANNOT also be present as a snapshot. To access such a code, exit SNAPSHOT by depressing the OFF button on the ECC. This will return the display to the next available system selection.
  4. After display of the last BCM trouble code for which a snapshot does exist, pressing the FANO button on the ECC will result in the DO B SNAP display.
  5. Press the FANO button on the ECC to return the display to the first BXXX SNAP? display. Responding to the DO B SNAP display by depressing the FANL button with SNAP DATA? or SNAP INPUTS? displayed, selects that desired type.
  6. Display is controlled now as it would be for non-snapshot data and inputs, however, all values and status information represents memorized vehicle conditions. See SPECIFIC TEST SELECTION (EXPLANATION) and SPECIFIC TEST SELECTION (MAKING SELECTION) under MANUAL OPERATION OF SELF-DIAGNOSTICS.
  7. Depressing the FANL button again with DO B SNAP? displayed will display the SNAP DONE message to indicate new information has been stored in memory.
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