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Home >> Lincoln >> 1996 >> Town Car Base >> Repair and Diagnosis (Single Page) >> Body & Frame >> Mirrors >> Power Memory Mirror System >> Symptom Testing >> Test F: Memory Function Inoperative

Test F: Memory Function Inoperative

  1. With both doors closed, note both outside mirror positions. Press memory set button and within 5 seconds, press memory 1 button. Using mirror switch, move both mirrors to a new position, ensuring both move vertically and horizontally. Press memory set button and within 5 seconds, press memory 2 button. If both mirrors move properly, go to next step. If mirrors do not function properly, see SYSTEM TEST B or C.
  2. Press memory 1 button. Press memory set button and within 5 seconds, press memory 1 button. If LED lights, press memory 2 button and go to next step. If LED does not light, test memory seat switch. See SEATS - POWER article.
  3. Press memory 1 button. If mirrors move to exact position set instep 1), press memory 2 and 1 several times to ensure consistent operation. If no problems are noted, system is okay. If mirrors do not move to memory positions consistently, go to next step.
  4. Press memory 1 button. Press memory 2 button. If mirrors do not move, test memory seat switch. See SEATS - POWER article. If mirrors move, go to next step.
  5. Using a voltmeter, backprobe potentiometer inputs at DSM connector C313 for motions that did not work. See POTENTIOMETER INPUT INDEX.
    POTENTIOMETER INPUT INDEX

    Motion Wire Color
    Driver Horizontal Red/White
    Driver Vertical Dark Blue/White
    Passenger Vertical Purple/White
    Passenger Horizontal Dark Green/White

    If all readings are less than .5 volt, repair Gray/Red wire to DSM for open or short to ground and retest. If all readings are not less than .5 volt, go to next step.

  6. If both circuits for one mirror are less than .5 volt, repair Gray/Red wire to affected mirror for open or short to ground and retest. If one mirror circuit is not less than .5 volt, go to next step.
  7. If any circuit is less than .5 volt, check affected circuit for open or damaged potentiometer. If all circuits are more than .5 volt, go to next step.
  8. If any one circuit is constant between .5-4.5 volts, replace affected mirror motor and retest. If no circuit is constant between .5-4.5 volts, go to next step.
  9. If all circuits are between 4.5-5 volts, repair Gray wire open and retest. If all circuits are not between 4.5-5 volts, go to next step.
  10. If all circuits are 5 volts or less, replace DSM and retest. If all circuits are more than 5 volts, go to next step.
  11. Check seat and mirror potentiometer circuits for short to battery voltage. See SEAT POTENTIOMETER CIRCUIT INDEX TABLE. If battery voltage exists on any circuit(s), repair circuit short to battery voltage and retest. If battery voltage does not exist on any circuit, system is normal.
SEAT POTENTIOMETER CIRCUIT INDEX

Wire Color (1) Connector No. Terminal No.
Gray/Red C313 14
Black/Pink (2) C313 16
Orange/ Light Blue C313 3
Light Green/Red C313 15
Light Green/Orange C313 2
Light Green/Black C313 9
Red/White C313 8
Dark Blue/White C313 19
Dark Green/White C313 18
Purple/White C313 17
Orange/White C355 "+"
Orange/Red C355 "-"
Gray C615 N/A
Gray/Red C615 N/A
(1) C313 is located on DSM. C355 is located on drivers seat motor assembly. C615 is located in passenger door for rear view mirror.
(2) Wire color is Brown/Pink on 1996 models.
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