FixVault
Home › Cadillac › 1992 › Seville Base › Repair and Diagnosis › Body & Frame › Door Locks › Anti-Theft System › Testing › Universal Theft Deterrent (UTD) System Testing › Theft Deterrent Module Test

Theft Deterrent Module Test

  1. To check module ground, disconnect theft deterrent module 14-pin connector. Use an ohmmeter and measure resistance between connector terminal "A" (Black/White wire) and ground. Less than one ohm should be present. If more than one ohm is present, repair open circuit in Black/White wire.
  2. To check indicator control, use a voltmeter and measure voltage at connector terminal "D" (Dark Green wire). Battery voltage should be present. If not, check indicator bulb. If bulb is okay, check Dark Green wire for a short to ground.
  3. To check alarm system control, use a voltmeter and measure voltage at connector terminal "F" (Black/White wire). Battery voltage should be present. If not, see THEFT DETERRENT RELAY TEST.
  4. To check system arm input, use a voltmeter and measure voltage at connector terminal "G" (Light Blue wire). Battery voltage should be present with any door lock switch in lock position. With door lock switch in unlock or neutral position, no voltage should be present. If voltages are not as indicated, check power door lock operation. If locks do not work, See appropriate POWER DOOR LOCKS article in the ACCESSORIES/SAFETY EQUIPMENT Section. If locks work, repair open circuit in Light Blue wire.
  5. To check disarm input without keyless entry, use an ohmmeter and measure resistance between connector terminal "H" (Light Green wire) and ground. With door lock cylinder in unlock position, less than 10 ohms should be present. More than 10,000 ohms should be present with both door lock cylinders in lock or neutral position.
  6. If resistances are not as indicated, check Light Green wire for an open or short to ground and Black/White wire for an open circuit. If wires are okay, replace suspect door lock cylinder switch.
  7. To check disarm input with keyless entry, measure voltage at connector terminal "H" (Light Green wire). No voltage should be present with door lock cylinder in unlock position. With both door lock cylinders in lock or neutral position, battery voltage should be present.
  8. If voltages are not as indicated, check Light Green wire for an open or short to ground and Black/White wire for an open circuit. If wires are okay, replace suspect door lock cylinder switch.
  9. To check tamper input, use a voltmeter and measure voltage at connector terminal "J". Battery voltage should be present with all doors closed and trunk lid tamper switch not closed. With any door open or tamper switch closed, no voltage should be present.
  10. If voltages are not as indicated, check Light Blue wire and Tan wire for an open or short circuit. Check door ajar switches and Retained Accessory Power (RAP)/illuminated entry module for an open or short circuit to ground.
  11. To check ignition input, use a voltmeter and measure voltage at connector terminal "K" (Pink/Black wire) with ignition switch in RUN, bulb test or START position. Battery voltage should be present. With ignition off, no voltage should be present. If voltages are not as indicated, repair open or short circuit in Pink/Black wire.
  12. To check system arm cancel input, use a voltmeter and measure voltage at connector terminal "M" (Black wire) with any door lock switch in unlock position. No voltage should be present with all door lock switches in lock or neutral positions.
  13. If voltages are not as indicated, check power door lock operation. If locks work, repair open circuit in Black wire. If locks do not work, See appropriate POWER DOOR LOCKS article in the ACCESSORIES/SAFETY EQUIPMENT Section.
  14. To check battery input, use a voltmeter and measure voltage at connector terminal "N" (Orange wire). Battery voltage should be present. If not, check fuse and Orange wire for an open or short to ground.
About FixVault