LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Cadillac >> 1998 >> Eldorado Base >> Repair and Diagnosis >> Body & Frame >> Body, Cab Control Systems >> Body Control Module >> Diagnostic Tests >> Class 2 Serial Data Line System Check >> Testing
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Class 2 Serial Data Line System Check: Testing

  1. Connect scan tool. Turn ignition switch to ON position. Attempt to establish communication with PZM. If communication cannot be established, go to next step. If communication can be established, record any DTCs that may be present. For PZM DTCs, go to appropriate DTC test. For other DTCs, see appropriate section.
  2. Using scan tool, attempt to establish communication with another system on class 2 serial data line. If communication cannot be established, go to CHART A: SCAN TOOL WILL NOT COMMUNICATE  . If communication can be established, check for poor connection at PZM Brown 24-pin connector C1, terminals B1 (Orange wire), A1 (Purple wire), A2 (Purple wire), and A12 (Black wire). See WIRING DIAGRAMS  . If circuits are okay, replace PZM. See REMOVAL & INSTALLATION.
scientia non olet · About LEMON Manuals