LEMON Manuals: Even more car manuals for everyone
Home >> Lincoln >> 2000 >> Town Car Signature >> Repair and Diagnosis >> Body & Frame >> Door Locks >> Power Door Lock System & Remote Keyless Entry Systems >> System Tests >> Test B: No Communication With Driver Door Module

Test B: No Communication With Driver Door Module

  1. Ensure transmission is in Park. Turn ignition off. Check fuse No. 30 (7.5-amp) in fuse junction panel. If fuse is okay, go to next step. If fuse is not okay, go to step  5 .
  2. Using a voltmeter, check voltage between ground and input side (left terminal) of fuse No. 30. If voltage is more than 10 volts, go to next step. If voltage is 10 volts or less, go to step  20 .
  3. Install fuse No. 30. Remove door trim panel. Disconnect DDM 22-pin connector C520 located in upper front corner of driver door. Using an ohmmeter, check resistance between ground and DDM 22-pin connector C520 terminal No. 29 (Light Green/Purple wire). See Fig 1 . If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Light Green/Purple wire between fuse junction panel and DDM. Retest system operation.
  4. Using an ohmmeter, check resistance between ground and DDM 22-pin connector C520 terminal No. 23 (Pink/Orange wire). See Fig 1 . If resistance 5 ohms or more, repair open in Pink/Orange wire and retest system operation. If resistance is less than 5 ohms, see appropriate MODULE COMMUNICATIONS NETWORK article to diagnosis network concern.
  5. Replace fuse No. 30 in fuse junction panel. DO NOT operate any switches. If fuse opens again, go to next step. If fuse does not open again, go to step  9 .
  6. Remove fuse No. 30 (7.5-amp) from fuse junction panel. Disconnect DDM 22-pin connector C520 and Driver Seat Module (DSM) 26-pin connector C313 located under driver seat. Using an ohmmeter, check resistance between ground and DDM 22-pin connector C520 terminal No. 29 (Light Green/Purple wire). See Fig 1 . If resistance is 10 k/ohms or less, go to next step. If resistance is more than 10 k/ohms, go to step  8 .
  7. Check driver door lock switch, right front passenger door lock switch and decklid release switch. See DOOR LOCK SWITCH  and DECKLID RELEASE SWITCH  under COMPONENT TESTS. Check outside rear view mirror control switch. See appropriate POWER MIRRORS article. Check driver power seat control switch. See appropriate POWER SEATS article. If all switches are okay, repair short to ground in Light Green/Purple wire and retest system operation. If any switch(es) are not okay, replace appropriate switch and retest system operation.
  8. Connect DSM 26-pin connector C313. Using an ohmmeter, check resistance between ground and DDM 22-pin connector C520 terminal No. 29 (Light Green/Purple wire). If resistance is more than 10 k/ohms, replace DDM and retest system operation. If resistance is 10 k/ohms or less, replace DDM and retest system operation.
  9. Lock and unlock doors using driver and right passenger door lock switches. If fuse No. 30 opens, go to next step. If fuse No. 30 is okay, go to step  12 .
  10. Check driver door lock switch and right front passenger door lock switch. See DOOR LOCK SWITCH  under COMPONENT TESTS. If switches are okay, go to next step. If any switch is not okay, replace appropriate switch(es) and retest system operation.
  11. Disconnect DDM 22-pin connector C520 located in upper front corner of driver door. Disconnect driver door lock switch 7-pin connector. Disconnect right front passenger door lock switch 7-pin connector. Using an ohmmeter, check resistance between ground and driver door lock switch connector C503 terminal No. 2 (Pink/Yellow wire). Check resistance between ground and driver door lock switch connector C505 terminal No. 6 (Pink/Light Green wire). If either or both resistance readings are 10 k/ohms or less, repair short to ground in appropriate wire(s). If both resistance readings are more than 10 k/ohms, replace DDM and retest system operation.
  12. Activate outside rear view mirror control switch through all positions. If fuse No. 30 opens, go to next step. If fuse No. 30 is okay, go to step  15 .
  13. Check outside rear view mirror control switch. See appropriate POWER MIRRORS article. If switch is okay, go to next step. If switch is not okay, replace switch and retest system operation.
  14. Disconnect DDM 22-pin connector C520 located in upper front corner of driver door. Disconnect outside rear view mirror control switch 10-pin connector. Using an ohmmeter, check resistance between ground and appropriate terminals at outside rear view mirror control switch connector C550. See MIRROR CONTROL SWITCH TERMINAL IDENTIFICATION  table. If all resistance readings are more than 10 k/ohms, replace DDM and retest system operation. If any resistance reading are 10 k/ohms or less, repair short to ground in appropriate wire(s) and retest system operation.
    MIRROR CONTROL SWITCH TERMINAL IDENTIFICATION

    Terminal No. Wire Color
    1 Red/Orange
    2 Dark Green/Orange
    4 Yellow/Black
    8 Purple/Orange
    9 Dark Blue/Orange
  15. Activate memory set/recall switch through all positions. If fuse No. 30 opens, go to next step. If fuse No. 30 does not open, go to step  18 .
  16. Check driver seat control switch. See appropriate POWER SEATS article. If switch is okay, go to next step. If switch is not okay, replace switch and retest system operation.
  17. Disconnect DDM 22-pin connector C520 and DDM 16-pin connector C521 located in upper front corner of driver door. Disconnect driver seat control switch 14-pin connector C509. Using an ohmmeter, check resistance between ground and driver seat control switch connector C509 terminals No. 4, 5, 6 and 7. See DRIVER SEAT CONTROL SWITCH TERMINAL IDENTIFICATION  table. If all resistance readings are more than 10 k/ohms, replace DDM and retest system operation. If any resistance readings are 10 k/ohms or less, repair short to ground in appropriate wire(s) and retest system operation.
    DRIVER SEAT CONTROL SWITCH TERMINAL IDENTIFICATION

    Terminal No. Wire Color
    1 Yellow/White
    2 Red/Light Blue
    3 Yellow/Light Blue
    4 White/Orange
    5 Brown/Orange
    6 Brown/Light Green
    7 Black/Orange
    9 Red/White
    11 Yellow/Light Green
    12 Red/Light Green
    13 Gray
    14 Gray/Black
  18. Activate driver seat control switch through all positions. If fuse No. 30 opens, go to next step. If fuse No. 30 does not open, system is operating properly at this time. Retest system operation.
  19. Remove door trim panel. Disconnect DDM 16-pin connector C521 located in upper front corner of driver door. Disconnect driver seat control switch 14-pin connector C509. Using an ohmmeter, check resistance between ground and terminals No. 1, 2, 3, 9, 11, 12, 13 and 14 at driver seat control switch connector C509. See DRIVER SEAT CONTROL SWITCH TERMINAL IDENTIFICATION  table. If all resistance readings are more than 10 k/ohms, replace DDM and retest system operation. If any resistance readings are 10 k/ohms or less, repair short to ground in appropriate wire(s) and retest system operation.
  20. Remove maxi-fuse No. 8 (30-amp) from battery junction box. Using a voltmeter, check voltage between ground and maxi-fuse No. 8 input cavity (Black/Orange wire). If voltage is more than 10 volts, go to next step. If voltage is 10 volts or less, repair Black/Orange wire and retest system operation.
  21. Remove fuse junction panel fuse No. 30 (7.5-amp). Disconnect Driver Seat Module (DSM) 2-pin connector C337 located under driver seat. Using an ohmmeter, check resistance in Red wire between battery junction box maxi-fuse No. 8 output cavity and fuse junction panel fuse No. 30 input cavity. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Red wire and retest system operation.
  22. Using an ohmmeter, check resistance between ground and battery junction box maxi-fuse No. 8 output cavity (Red wire). If resistance is more than 10 k/ohms, replace DDM and retest system operation. If resistance is 10 k/ohms or less, repair short to ground in Red wire and retest system operation.
Fig 1: Identifying DDM Connector C520 Terminals
G98F01568Courtesy of FORD MOTOR CO.
scientia non olet · About LEMON Manuals