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Home >> Ford >> 1992 >> Crown Victoria Base, AOD >> Repair and Diagnosis >> Body & Frame >> Door Locks >> Keyless Entry Systems - Remote >> Testing (Pinpoint Tests) >> Pinpoint Test D, Keypad Input >> Test Procedures
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Test Procedures

  1. Disconnect keypad and Brown connector. Check circuit corresponding to the failing button for short to ground (100K ohms or less) between Brown module connector and ground. See KEYPAD INPUT TEST  table. If short to ground is found, go to step 3). If no short is found, go to next step.
  2. Disconnect Brown module connector. Check for short between malfunctioning button and Brown wire. If no short is found, go to step 4). If short is found, replace keypad and repeat QUICK TEST  .
    KEYPAD INPUT TEST

    Key Circuit No. Pin No.
    1/2 78 3
    3/4 79 4
    5/6 121 5
    7/8 122 6
    9/0 123 7
  3. Remove door trim panel. Disconnect keypad connector. Check circuit corresponding to malfunctioning button for resistance of less than 100K ohms between keypad connector and ground or Brown wire. If resistance to ground or Brown wire is low, replace switch. If resistance is not low, repair harness between module connector and keypad connector. Repeat QUICK TEST  .
  4. With 1/2 button depressed, verify that Brown wire is not shorted to ground or open from pin No. 1 to pin No. 12. If wire is okay, go to step 5). If not, repair open or short in wire and repeat QUICK TEST  .
  5. Connect module connector. Connect voltmeter between pin No. 1 of Brown connector and ground. For each button that failed to light on keypad, connect a jumper wire for 5 seconds between pin No. 12 of Brown connector and keypad pins No. 1 through 6 and 8. If readings are 5 volts or more, go to step 6). If not, replace keyless entry module and repeat QUICK TEST  .
  6. Check continuity between pin No. 2 of keypad and all remaining keypad pins. Then check continuity between pin No. 1 and all pins until all pin pairs have been checked. If all circuits are open except those between pins No. 3 and 6, go to step 7). If a short is found, replace keypad and repeat QUICK TEST  .
  7. Check continuity between pins No. 2 and 5 of keypad connector. Repeat for each key, checking continuity between corresponding pin in the table and pin No. 5. See KEYPAD INPUT TEST  table. If continuity is present, repair open or short in circuit of inoperative buttons. If continuity is not present, replace keypad and repeat QUICK TEST  .
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