1993 Chrysler ImperialFACTORY OEM SERVICE PROCEDURE

Test 93A - Body Control Module No Response

NOTE: For connector terminal identification, see CONNECTOR IDENTIFICATION  . For appropriate wiring diagram, see WIRING DIAGRAMS  at end of article.
  1. Turn ignition off. Disconnect Body Control Module (BCM) Black connector. BCM is located behind right side kick panel. Using an external ohmmeter, check resistance of Violet/Brown wire between bus data link connector and terminal No. 7 of BCM Black connector. Chrysler Collision Detection (CCD) bus data link connector is located on left kick panel, near hood release handle. If resistance is more than 5 ohms, repair open Violet/Brown wire. Perform VERIFICATION PROCEDURE VER-1.
  2. If resistance is less than 5 ohms, check resistance of White/Black wire between bus data link connector and BCM Black connector. If resistance is more than 5 ohms, repair open White/Black wire. Perform VERIFICATION PROCEDURE VER-1.
  3. If resistance is less than 5 ohms, put DRB-II in ohmmeter mode. Check resistance on terminal No. 19 (Black/Light Green wire) of BCM Black connector. If resistance is more than 5 ohms, repair open Black/Light Green wire. Perform VERIFICATION PROCEDURE VER-1.
  4. If resistance is less than 5 ohms, put DRB-II in voltmeter mode. Turn ignition on (engine off). Check voltage on terminal No. 6 (Dark Blue/White wire) of BCM Black connector. If voltage is more than 10 volts, replace BCM. Perform VERIFICATION PROCEDURE VER-1.
  5. If voltage is less than 10 volts, remove and inspect fuse No. 8 from fuse block. See Figure . If fuse No. 8 is okay, check voltage of Dark Blue wire (in fuse block) of fuse No. 8. If voltage is more than 10 volts, repair open Dark Blue/White wire. Perform VERIFICATION PROCEDURE VER-1. If voltage is less than 10 volts, repair open Dark Blue wire. Perform VERIFICATION PROCEDURE VER-1.
  6. If fuse No. 8 is blown, turn ignition off. Disconnect electronic or mechanical instrument cluster. Using DRB-II in ohmmeter mode, check resistance of Dark Blue/White wire (in fuse block) of fuse No. 8. If resistance is less than 5 ohms, repair short to ground in Dark Blue/White wire and replace fuse No. 8. Perform VERIFICATION PROCEDURE VER-1.
  7. If resistance is more than 5 ohms, reconnect BCM. Check resistance of Dark Blue/White wire (in fuse block) of fuse No. 8. If resistance is less than 5 ohms, replace BCM and fuse No. 8. Perform VERIFICATION PROCEDURE VER-1.
  8. If resistance is more than 5 ohms, reconnect instrument cluster and replace fuse No. 8. Turn ignition on (engine off). Remove and inspect fuse No. 8. If fuse No. 8 is blown, replace instrument cluster and fuse No. 8. Perform VERIFICATION PROCEDURE VER-1. If fuse No. 8 is okay, repair is complete. Perform VERIFICATION PROCEDURE VER-1.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.