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Test L: Vehicle Dynamic Module (VDM) Does Not Respond To Scan Tester

WARNING: This page is about a different car, the 1997 Lincoln Continental. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ensure ignition switch is in OFF position. Disconnect 84-pin harness connector C217. Harness connector C217 is located behind driver's side of instrument panel. See Figure .
  2. Using ohmmeter, check resistance between terminal No. 76 (Tan/Orange wire) on male side of harness connector C217 and terminal No. 2 (Tan/Orange wire) on Data Link Connector (DLC). See Figure and Figure .
  3. If resistance is 5 ohms or less, go to next step. If resistance is more than 5 ohms, repair open circuit on Tan/Orange wire between DLC and harness connector C217. Repeat TEST A  .
  4. Using ohmmeter, check resistance between terminal No. 77 (Pink/Light Blue wire) on male side of harness connector C217 and terminal No. 10 (Pink/Light Blue wire) on DLC. See Figure and Figure .
  5. If resistance is 5 ohms or less, go to next step. If resistance is more than 5 ohms, repair open circuit on Pink/Light Blue wire between DLC and harness connector C217. Repeat TEST A  .
  6. Disconnect Black 14-pin harness connector C471. Harness connector C471 is located in the trunk. See Figure .
  7. Using ohmmeter, check resistance between terminal No. 76 (Tan/Orange wire) on female side of harness connector C217 and terminal No. 9 (Tan/Orange wire) on female side of harness connector C471. See Figure and Fig 1 .
  8. If resistance is 5 ohms or less, go to next step. If resistance is more than 5 ohms, repair open circuit on Tan/Orange wire between harness connectors C217 and C471. Repeat TEST A  .
  9. Using ohmmeter, check resistance between terminal No. 77 (Pink/Light Blue wire) on female side of harness connector C217 and terminal No. 14 (Pink/Light Blue wire) on female side of harness connector C471. See Figure and Fig 1 .
  10. If resistance is 5 ohms or less, go to next step. If resistance is more than 5 ohms, repair open circuit on Pink/Light Blue wire between harness connectors C217 and C471. Repeat TEST A  .
    Fig 1: Identifying Harness Connector C471 Terminals
    G97I28777Courtesy of FORD MOTOR CO.
  11. Disconnect 60-pin connector C408 from Vehicle Dynamic Module (VDM). The VDM is located in driver's side of trunk, on panel below rear window. See Figure .
  12. Using ohmmeter, check resistance between terminal No. 9 (Tan/Orange wire) on male side of harness connector C471 and terminal No. 19 (Tan/Orange wire) on connector C408. See Fig 1 and Fig 2 .
  13. If resistance is 5 ohms or less, go to next step. If resistance is more than 5 ohms, repair open circuit on Tan/Orange wire between harness connector C471 and connector C408. Repeat TEST A  .
  14. Using ohmmeter, check resistance between terminal No. 14 (Pink/Light Blue wire) on male side of harness connector C471 and terminal No. 18 (Pink/Light Blue wire) on connector C408. See Fig 1 and Fig 2 .
  15. If resistance is 5 ohms or less, go to next step. If resistance is more than 5 ohms, repair open circuit on Pink/Light Blue wire between harness connector C471 and connector C408. Repeat TEST A  .
  16. Inspect pins and wire connections on harness connector C471 and connector C408. If pins and wire connections are okay, replace VDM. Repeat TEST A  . If pins or wire connections are defective or damaged, repair pins or wire connections as necessary. Repeat TEST A  .
Fig 2: Identifying Connector C408 Terminals
G97A28779Courtesy of FORD MOTOR CO.
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