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Contents Section: Door Locks & Anti-Theft Systems All sections

Door Locks & Tailgate Locks - Automatic Cadillac Brougham I

Door Locks & Anti-Theft Systems 2 illustrations ~3361 words

DESCRIPTION

The automatic door lock system uses conventional power door lock system. In order to accomplish the automatic feature, additional components are used.

Units necessary to this system are an Automatic Door Lock (ADL) controller, decoder module, lock and unlock relay, automatic door lock diode, gear selector switchlock relay, motor lock actuator relay, back-up light switch, right front door lock cylinder key switch, drive switch and a seat sensor switch. Some models may not use one or more of these components.

OPERATION

Doors lock automatically when ignition switch is at "RUN", "BULB TEST" or "START" position and transmission is placed in any mode other than Park. Doors unlock automatically when ignition switch is at "RUN", "BULB TEST" or "START" position and transmission is placed in Park.

SYSTEM CHECK

  1. From inside of vehicle, close all doors. Turn ignition switch to "RUN" position and place gear selector in Drive or Reverse. All doors should lock.
  2. Place gear selector in Park. All doors should unlock. If any door does not lock, check digital cluster fuses No. 5, 15 and 19, indicator and gauge cluster fuse No. 16 and circuit breaker No. 24.
  3. If locks do not lock, ensure that ignition switch is at "RUN" position, all doors are closed and gear selector is not in Park. If locks do not unlock, ensure that ignition switch is at "RUN" position and gear selector is in Park.

Note. Before testing automatic door locks, ensure that power door locks are operating properly. Repair as necessary. See GENERAL MOTORS POWER DOOR LOCKS article in this section.

Delta 88, Eldorado, Ninety-Eight & Seville

  1. On Delta 88 and Ninety-Eight, disconnect automatic door lock controller connector. On Eldorado and Seville, leave automatic door lock connector connected. On all models, turn ignition to "RUN" position.
  2. On all models, connect voltmeter between Orange wire and ground. Battery voltage should be present. If not, check Orange wire for open circuit.
  3. Connect voltmeter between Pink/Black wire and ground. Battery voltage should be present. If not, check Pink/Black wire for open circuit.
  4. Connect voltmeter between Pink/Black and Black wires. Battery voltage should be present. If not, check Black wire for open circuit. If all voltages and circuits are correct from the previous steps, go to «LOCK CIRCUIT TEST»(/cadillac/brougham/i-1987-1992/remont/door-locks-anti-theft-systems/#door-locks-tailgate-locks-automatic) .

DeVille & Fleetwood

  1. Turn ignition switch to "RUN" position. With automatic door lock controller connected, connect voltmeter between Pink/Black wire and ground. Battery voltage should be present. If not, check Pink/Black wire for open circuit.
  2. Connect voltmeter between Pink/Black and Black wires. Battery voltage should be present. If not, check Black wire for open circuit. If voltages and circuits are correct from the previous steps, go to «LOCK CIRCUIT TEST»(/cadillac/brougham/i-1987-1992/remont/door-locks-anti-theft-systems/#door-locks-tailgate-locks-automatic) .

Toronado

  1. Turn ignition switch to "RUN" position. With automatic door lock module connected, connect voltmeter between Orange wire and ground. Battery voltage should be present. If not, check Orange wire for open circuit.
  2. Connect voltmeter between Pink/Black wire and ground. Battery voltage should be present. If not, check Pink/Black wire for open circuit.
  3. Connect voltmeter between Pink/Black and Black wires. Battery voltage should be present. If all voltages and circuits are correct from the previous steps, go to LOCK CIRCUIT TEST.
  1. Turn ignition switch to "RUN" position, courtesy light off, all doors closed and gear selector in Park. With automatic door lock controller connected, connect test light between Light Green/Black wire on controller connector and ground. Test light should come on. If not, go to step 2).
  2. Check wiring to Neutral safety/back-up switch. Check for voltage at Dark Blue wire of Neutral safety/back-up switch. If okay, check adjustment on Neutral safety/back-up switch. Repair or replace as necessary.
  3. Move gear selector out of Park. Connect test light between Light Green wire and ground. Test light should not come on. If test light comes on, check Neutral safety/back-up switch adjustment. Repair or replace as necessary.
  4. Connect test light between Pink/Black and White wires. Test light should not come on. If it does, check door jamb switches, light switch, and White wire for short to ground. Repair or replace as necessary.
  5. Connect test light between Yellow wire and ground. Observe test light while moving gear selector from Park to Reverse. Test light should flash once. If not, replace automatic door lock controller.
  6. If results from above tests are correct, check or repair Yellow and Light Blue wires and the left seat switch for open circuit.

Delta 88 & Ninety-Eight

  1. Turn ignition switch to "RUN" position, all doors closed, gear selector in Park, and automatic door lock controller connected.
  2. Connect test light between Light Green/Black wire and ground. Test light should come on. If not, check Light Green/Black wire for open circuit. Check voltage at terminal "D" and adjustment of gear selector position switch. Repair or replace as necessary.
  3. Move gear selector out of Park to Reverse position. Connect test light between Light Green/Black wire and ground. Test light should not come on. If it does, check transaxle position switch adjustment.
  4. With gear selector still in Reverse position, connect test light between White wire and ground. Test light should come on. If not, check door jamb switch and White wire for short to ground. Repair or replace as necessary.
  5. Connect test light between Light Blue wire and ground. Move gear selector from Park to Reverse. Test light should flash once. If not, replace automatic door lock controller.

Eldorado & Seville

  1. Enter Body Control Module (BCM) diagnostics. See GENERAL MOTORS COMPUTERIZED ENGINE CONTROLS section. Select BCM input test B105. Close all doors. BCM should display "HI".
  2. Open left or right front door, display should read "LO". Close left or right front door, display should read "HI". Open left or right rear door, display should read "LO". Close right or left rear door, display should read "HI". If results are correct, proceed to step 3). If not, refer to BCM INPUT TEST B105 in this article.
  3. Turn ignition switch to "RUN" position. Disconnect automatic door lock module connector. Close both doors. Connect voltmeter between White/Black wire and ground. Battery voltage should be present. If not, check wire for open circuit. If okay, go to step 4).
  4. Connect automatic door lock module connector. Turn ignition switch to "RUN" position, gear selector in Reverse, and all doors closed. Connect test light between Gray wire and ground. Test light should not come on. If it does, check transaxle position switch adjustment.
  5. Move gear selector in Park, connect test light between Gray wire and ground. Test light should come on. If not, check Gray wire and transaxle position switch. Repair or replace as necessary.
  6. Connect test light between White/Black wire and ground. Test light should come on. If not, check connector terminal. If terminal is okay, replace automatic door lock module.
  7. Connect test light between Light Blue wire and ground. Observe test light while moving gear selector out of Park position. Test light should flash once. If not, check connector terminal. If terminal is okay, replace automatic door lock module.
  8. If all the results from the above tests are correct, check Light Blue wire for open circuit. Repair or replace as necessary.
  1. Enter Body Control Module (BCM) diagnostics. See GENERAL MOTORS COMPUTERIZED ENGINE CONTROLS section. Select BCM input test B105. Close all doors. BCM should display "HI".
  2. Open left or right door, display should read "LO". Close left or right door, display should read "HI". If results are correct, proceed to step 3). If not, refer to BCM INPUT TEST B105 in this article.
  3. Turn ignition switch to "RUN" position. Disconnect automatic door lock module connector. Close both doors. Connect voltmeter between White/Dark Green wire and ground. Battery voltage should be present. If not, check wire for open circuit. If okay, go to step 4).
  4. Connect automatic door lock module connector. Turn ignition switch to "RUN" position, gear selector in Reverse, and both doors closed. Connect test light between Gray/Black wire and ground. Test light should not come on. If it does, check transaxle position switch adjustment.
  5. Connect test light between Gray/Black wire and ground. Test light should come on. If not, check Gray/Black wire and transaxle position switch. Repair or replace as necessary.
  6. Move gear selector to Park. Connect test light between Light Blue wire and ground. Observe test light while moving gear selector out of Park position. Test light should flash once. If not, check connector terminal. If terminal is okay, replace automatic door lock module.
  7. If all the results from the above tests are correct, check Light Blue wire for open circuit. Repair or replace as necessary.
  1. Turn ignition switch to "RUN" position, gear selector in Park, and automatic door lock controller connector connected. Connect test light between Light/Green/Black and ground. Test light should come on. If not, go to step 2).
  2. Check Light Green/Black wire for open circuit. Check voltage at terminal "D" of transaxle position switch. Check adjustment of transaxle position switch. Repair or replace as necessary.
  3. Connect test light between Light Green/Black wire and ground. Move gear selector out of Park position. Test light should not come on. If it does, check transaxle position switch position.
  4. Connect test light between Black/White wire and ground. Move gear selector from Reverse to Park position. Test light should flash once. If not, replace automatic door lock controller.
  5. Connect test light between Yellow wire and ground. Put key in left door lock cylinder and hold in unlock position. Test light should not come on. If it does, check Yellow and Black wires for open circuit. If wires are okay, replace left door lock cylinder switch.
  6. If results from all the above tests are correct. Check Black/White wire for an open circuit.
  1. Turn ignition switch to "RUN" position, gear selector in Park, and automatic door lock controller connector connected. Connect test light between Light Green/Black and ground. Test light should come on. If not, proceed to step 2).
  2. Check wiring and adjustment to Neutral safety/backup switch. Check for voltage at terminal "D" of Neutral safety/backup switch. Repair or replace as necessary.
  3. Move gear selector out of Park. Connect test light between Light Green/Black wire and ground. Test light should not come on. If it does, check Neutral safety/backup switch adjustment. Repair or replace as necessary.
  4. Connect test light between Black/White wire and ground. Observe test light while moving gear selector from Reverse to Park. Test light should flash once. If not, replace automatic door lock controller.
  5. If results from all the above tests were correct, check Black/White wire for an open circuit.
  1. Turn ignition switch to "RUN" position, gear selector in Park, and all doors closed, and automatic door lock module connector connected. Connect test light between Gray wire and ground. Test light should come on. If not, check transaxle position switch adjustment.
  2. Move gear selector out of Park position. Connect test light between Gray wire and ground. Test light should not come on. If it does, check Gray wire and transaxle position switch. Repair or replace as necessary.
  3. Connect test light between Black wire and ground. Observe test light while moving gear selector to Park. Test light should flash once. If not, check connector terminal. If terminal is okay, replace automatic door lock module.
  1. Disconnect automatic door lock module connector. Turn ignition switch to "RUN" position and gear selector in Park. Connect test light between Gray/Black wire and ground. Test light should come on. If not, check Gray/black wire and transaxle position switch. Repair or replace as necessary.
  2. Move gear selector out of Park position. Connect test light between Gray/Black wire and ground. Test light should not come on. If it does, check transaxle position switch adjustment.
  3. With gear selector still out of Park position, connect test light between Light Green and Orange wires. Test light should not come on. If it does, check Light Green wire and left door lock cylinder switch for short to ground.
  4. Insert key in left door lock cylinder and hold in unlock position. Connect test light between Light Green and Orange wires. Test light should come on. If not, check wires for open. If wires are okay, replace left door lock cylinder switch.
  5. Reconnect automatic door lock module connector. Connect test light between Black wire and ground. Observe test light while moving gear selector to Park, test light should flash once. Observe test light when key is moved to unlock position in left door lock cylinder switch, test light should flash once. If not, go to step 6).
  6. Check automatic door lock module connector terminal. If connector terminal is okay, replace automatic door lock module.

BCM INPUT TEST B105 (DOOR JAMB SWITCH)

Note. "HI" is displayed with all doors completely closed. "LO" is displayed with one or more doors open.

Test BI05 Displays "HI" (Eldorado & Seville)

  1. Observe BCM display with all doors open and all doors closed. If display reads "HI" with all doors open, go to step 2). If display reads "HI" when any single door is open, go to step 3).
  2. Backprobe BCM (located behind glove box) terminal 3C8 to ground with a fused jumper. (Scheme 4) If display now reads "LO", check White/Black and White wires for open circuit between splice and BCM. If display reads "HI", check BCM terminal. If terminals are okay, replace BCM.
  3. Disconnect the suspect door jamb switch. Connect a fused jumper between terminal "C" of door jamb connector and ground. If display reads "LO", go to step 4). If display reads "HI", check White wire for open circuit between splice and door jamb switch.
  4. Connect a fused jumper between terminals "C" and "B" of the suspect door jamb switch. (Scheme 4) If display reads "HI", check Black/White wire between splice and door jamb switch. If display reads "LO", replace suspect door jamb switch.

Test BI05 Displays "LO" (Eldorado & Seville)

  1. Disconnect each door jamb switch and observe BCM display. If display reads "LO", go to step 2).
  2. Disconnect automatic door lock module. If display reads "LO", go to step 3). If display reads "HI", replace automatic door lock module.
  3. Disconnect BCM. Connect a self-powered test light to BCM connector terminal 3C8. (Scheme 4) If test light comes on, check White and White/Black wires for short to ground. If test light does not come on, check BCM terminal for good and clean terminal connection. If connections are okay, replace BCM.

Scheme 4

Scheme 4
Scheme 4

Test BI05 Displays "HI" (Toronado)

  1. If display reads "HI" with both doors open, backprobe BCM (located above and right of fuse box) terminal 3C8 to ground with a fused jumper wire. (Scheme 5) If display now reads "LO", check White/Dark Green wire for open between splice and BCM. If display reads "HI", check for good terminal contact at BCM. If contact is good, replace BCM.
  2. If display reads "HI" with only one door open, disconnect suspect door jamb switch connector. Connect a fused jumper wire between terminals "B" and "C" of switch connector. If display still reads "HI", go to step 3). If display reads "LO", replace suspect door jamb switch.
  3. Leave the fused jumper from step 2) connected to terminal "C". Connect the other end of jumper to ground. If display still reads "HI", check White wire between splice and suspect switch. If display now reads "LO", check Black/White wire between splice and suspect switch.

Test BI05 Displays "LO" (Toronado)

  1. Disconnect connector C360. (Scheme 5) Close both doors. If display reads "LO", go to step 2). If display reads "HI", replace left door jamb switch.
  2. Disconnect connector C361. (Scheme 5) Close both doors. If display still reads "LO", check White wires to left and right door switches to splice for short to ground. If wires are okay, replace BCM. If display reads "HI", replace right door jamb switch.

Scheme 5

Scheme 5
Scheme 5

SYSTEM DIAGNOSIS (BROUGHAM)

Note. Perform all diagnostics with all doors closed and dimmer switch off.

  1. Operate power door locks using left and right door lock switch. If power door locks operate, proceed to step 2). If not, refer to GENERAL MOTORS POWER DOOR LOCKS article in this section.
  2. Sit in driver's seat. Close all doors. Turn ignition switch to "RUN" position. Place gear selector in Drive. All doors should lock. If not, leave ignition switch in "RUN" position and go to step 4).
  3. Place gear selector in Park. All doors must unlock. If it does, end test. If not, go to step 15).
  4. Backprobe gear selector switch connector with a test light from cavity "A" to ground. If test light does not come on, check Orange wire for open circuit. If test light comes on, proceed to step 5).
  5. Backprobe gear selector switch connector with a test light from cavity "B" to ground. Place gear selector switch in Drive. If test light does not come on, replace gear selector switch. If test light comes on, leave ignition switch in "RUN " position and go to step 6).
  6. Backprobe lock enable relay connector with test light from cavity "C" to ground. If test light does not come on, check Black/White wire for open circuit. If test light comes on, go to step 7).
  7. Disconnect lock enable relay and automatic door lock controller connectors. Connect ohmmeter between lock enable relay connector cavity "B" to ground. If resistance is greater than 0.03 ohms, repair open in Black ground wire. If resistance is less than 0.03 ohms, leave both connectors disconnected and proceed to step 8).
  8. Connect ohmmeter between automatic door lock controller connector cavity "W" and lock enable relay connector cavity "A". If resistance is greater than 0.03 ohms, check open in Light Green wire. If resistance is less than 0.03 ohms, turn ignition switch to "RUN" position and move gear selector to Drive and go to step 9).
  9. Reconnect lock enable relay connector. Connect ohmmeter between automatic door lock controller connector cavity "W" and ground. If resistance is greater than 0.03 ohms, replace lock enable relay. If resistance is less than 0.03 ohms, reconnect automatic door lock controller and go to step 10).
  10. Backprobe automatic door lock controller connector with a test light from cavity "V" and ground. If test light does not light, repair open circuit in Pink/Black wire. If test light comes on, go to step 11).
  11. Disconnect automatic door lock controller connector. Connect ohmmeter between cavity "Z" and ground. If resistance is greater than 0.03 ohms, repair Black ground wire. If resistance is less than 0.03 ohms, go to step 12).
  12. With doors closed. Connect ohmmeter between automatic door lock controller connector cavity "X" and ground. If resistance is less than 0.03 ohms, repair short in White wire or door jamb switches. If resistance is greater than 0.03 ohms, go to step 13).
  13. Connect ohmmeter between automatic door controller connector cavity "S" and left front seat switch connector cavity "A". Have someone sit on driver's seat to close switch. If resistance is greater than 0.03 ohms, repair open in Yellow/Black wire or left front seat switch.
  14. Reconnect automatic door lock controller connector. Backprobe connector with test light between cavity "S" and ground. Turn ignition to "RUN" position, gear selector in Drive, all doors closed, and driver's seat occupied. If test light does not come on, replace automatic door lock controller. If test light comes on momentarily, repair open in Yellow wire.
  15. Disconnect gear selector switch connector. Connect ohmmeter between gear selector switch connector cavity "B" and ground. If resistance is greater than 0.03 ohms, repair Black ground wire. If resistance is less than 0.03 ohms, reconnect gear selector switch connector and go to step 16).
  16. Disconnect door lock controller connector. Connect ohmmeter between controller connector cavity "Y" and ground. Measure resistance with gear selector in Park. If resistance is greater than 0.03 ohms, check for open circuit in Light Blue wire or gear selector switch. If resistance is less than 0.03 ohms, reconnect controller and proceed to step 17).
  17. Backprobe automatic door lock controller connector with test light between cavity "U" and ground. Turn ignition switch to "RUN" position and place gear selector in Park. If test light does not come on, replace automatic door lock controller. If test light comes on momentarily, repair open in Black wire.

WIRING DIAGRAMS

For wiring diagrams, refer to appropriate chassis wiring diagram in WIRING DIAGRAMS section.

See also:
• LOCK CIRCUIT TEST

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