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Shift Interlock System Cadillac DeVille Concours I final

Automatic Trans 42 illustrations ~16188 words

MODEL IDENTIFICATION

ModelBody Code (1)
Metro & Firefly (Canadian)"A" Or "M"
Park Avenue"C"
Eldorado"E"
Camaro & Firebird"F"
Aurora & Riviera"G"
Bonneville, Eighty Eight, LeSabre & LSS"H"
Cavalier & Sunfire"J"
DeVille & Seville"K"
Alero, Cutlass, Grand Am & Malibu"N"
Prizm"S"
Catera"V"
Century, Grand Prix, Intrigue, Lumina, Monte Carlo & Regal"W"
Corvette"Y"
Saturn"Z"
(1) Vehicle body code is fourth character of VIN.
(1)Vehicle body code is fourth character of VIN.

MODEL IDENTIFICATION

DESCRIPTION & OPERATION

Transaxle/Transmission shift interlock system prevents driver from moving gearshift lever from "P" position unless ignition switch is turned to ON position. On models equipped with Brake Transmission Shift Interlock (BTSI) solenoid, gearshift lever cannot be moved from "P" position without simultaneously applying brake pedal with ignition switch turned to ON position. Shift interlock solenoid is located at gearshift lever in steering column or center console.

PARK LOCK CABLE

Gearshift lever is locked in "P" position when ignition switch is in LOCK position. When ignition switch is turned to ON position, gearshift lever is allowed movement to desired position. Ignition key cannot be removed until gearshift lever is returned to "P" position.

SHIFT INTERLOCK SOLENOID

Gearshift lever cannot be moved from "P" position without simultaneously applying brake pedal with ignition switch turned to ON position. When brake pedal is applied, brakelight switch completes or interrupts circuit to BTSI solenoid. Depending upon application, energizing or de-energizing BTSI solenoid unlocks gearshift lever from "P" position. See WIRING DIAGRAMS .

TROUBLE SHOOTING

Note. Individual component testing procedures are not available from manufacturer. To identify model specific components within shift interlock system, component location, wire color, see appropriate wiring diagram in WIRING DIAGRAMS . For connector terminal identification, see appropriate connector in CONNECTOR VIEWS .

VISUAL INSPECTION

Diagnosis of shift interlock system should begin with a general visual inspection. Each model is similar in function, but may be equipped with a variety of components depending upon application. Before beginning any diagnosis, refer to appropriate wiring diagram to become familiar with the system and for use as a guide to pinpoint areas of concern. See WIRING DIAGRAMS .

Once familiar with system being diagnosed, check operation of the following

  1. With ignition switch in LOCK position, gearshift lever should be locked in "P" position.
  2. With gearshift lever in "P" position, ignition switch should be allowed movement from LOCK position to any desired position and back to LOCK position. Ignition key should be removable while in LOCK position.
  3. With ignition switch in ON position, gearshift lever should be allowed movement from "P" position. Models equipped with BTSI solenoid require that brake pedal be depressed for this operation.
  4. With ignition switch in ON position and gearshift lever in any position other than "P" position, ignition key is non-removable. Ignition key is removable only when gearshift lever is moved to "P" position.

If shift interlock system operates as specified, system is functioning properly at this time. If system does not operate as specified, inspect mechanical functions of the following

  1. Ignition Switch
  2. Gearshift Lever Assembly
  3. External Shift Cable/Linkage
  4. Internal Transaxle/Transmission Shift Linkage

If switch or cable adjustment problems are found, adjust as necessary. See ADJUSTMENTS . If mechanical functions are okay, see the following appropriate test in SYMPTOM TESTS

  1. «SHIFT LOCK CONTROL INOPERATIVE»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system__shift-lock-control-inoperative)
  2. «SHIFT LOCK CONTROL ALWAYS ON (IGNITION IN ON POSITION)»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system__shift-lock-control-always-on-ignition)
  3. «SHIFT LOCK CONTROL INOPERATIVE (BTSI INDICATOR INOPERATIVE) - "V" BODY ONLY»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system)
  4. «KEY CANNOT BE REMOVED (IGNITION IN OFF POSITION) - "V" BODY ONLY»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system)
  5. «STEERING COLUMN LOCK MALFUNCTION (GRAND PRIX & REGAL) - "W" BODY ONLY»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system)

CONNECTOR VIEWS

Note. On some vehicles, Park Neutral Position (PNP) switch is referred to as Transmission Range (TR) switch and Brake Transmission Shift Interlock (BTSI) switch is referred to as a brakelight switch or stoplamp switch. (Scheme 24)- (Scheme 41).

Scheme 24

Scheme 24: CONNECTOR VIEWS
Scheme 24: CONNECTOR VIEWS

Scheme 25

Scheme 25
Scheme 25

Scheme 26

Scheme 26
Scheme 26

Scheme 27

Scheme 27
Scheme 27

Scheme 28

Scheme 28
Scheme 28

Scheme 29

Scheme 29
Scheme 29

Scheme 30

Scheme 30
Scheme 30

Scheme 31

Scheme 31
Scheme 31

Scheme 32

Scheme 32
Scheme 32

Scheme 33

Scheme 33
Scheme 33

Scheme 34

Scheme 34
Scheme 34

Scheme 35

Scheme 35
Scheme 35

Scheme 36

Scheme 36
Scheme 36

Scheme 37

Scheme 37
Scheme 37

Scheme 38

Scheme 38
Scheme 38

Scheme 39

Scheme 39
Scheme 39

Scheme 40

Scheme 40
Scheme 40

Scheme 41

Scheme 41
Scheme 41

SYMPTOM TESTS

CAUTIONBe careful when probing fuse or junction blocks, or any connectors. Damage will result to connector receptacle if probe or terminal being used is too large. Electronic modules are sensitive to static electrical charges. If exposed to these charges, damage may result.

Note. On some vehicles, Park Neutral Position (PNP) switch is referred to as Transmission Range (TR) switch and Brake Transmission Shift Interlock (BTSI) switch is referred to as a brakelight switch or stoplamp switch.

SHIFT LOCK CONTROL INOPERATIVE

Note. Diagnostic information for Chevrolet Metro & Firefly (Canadian) ("A" and "M" body) and Saturn ("Z" body) vehicles is not available. See appropriate wiring diagram in WIRING DIAGRAMS .

Note. Ensure Brake Transmission/Transaxle Shift Interlock (BTSI) system operates correctly before performing following tests. See SHIFT INTERLOCK SOLENOID under DESCRIPTION & OPERATION.

"C" Body (Park Avenue)

  1. Turn ignition switch to ON position. Connect scan tool to DLC. Select "SBM" (Body Control Module) on scan tool. Check for SBM DTCs. If any SBM DTCs are present, see BODY CONTROL MODULES - PARK AVENUE article in ACCESSORIES & EQUIPMENT. If no SBM DTCs are present, go to next step.
  2. Turn ignition switch to OFF position. Disconnect brakelight switch 4-pin connector C1. (Scheme 24) Turn ignition switch to ON position. Measure voltage between brakelight switch harness connector C1 terminal "A" and ground. If voltage is 10-15 volts, go to next step. If voltage is not 10-15 volts, repair open in BTSI DRIVE circuit between SBM and connector C1, then go to step 8. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system).
  3. Ensure brake pedal is not applied. Measure voltage between brakelight switch harness connector C1 terminals "A" and "B". If voltage is 10-15 volts, go to next step. If voltage is not 10-15 volts, go to step 5.
  4. Check brakelight switch 4-pin connector C1 for damaged or loose terminals. Repair as necessary, then go to step 8. If connector and terminals are okay, replace brakelight switch, then go to step 8.
  5. Turn ignition switch to OFF position. Reconnect brakelight switch 4-pin connector C1. Disconnect BTSI solenoid 2-pin connector. Turn ignition switch to ON position. Measure voltage between BTSI solenoid harness connector terminal "A" and ground. (Scheme 25) If voltage is 10-15 volts, go to next step. If voltage is not 10-15 volts, repair open in BTSI solenoid power circuit between brakelight switch and BTSI solenoid. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system).
  6. Turn ignition switch to ON position. Measure resistance between BTSI solenoid harness connector terminal "B" and ground. (Scheme 25) If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in BTSI solenoid ground circuit, then go to step 8. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system).
  7. Check BTSI solenoid connector for damaged or loose terminals. Repair as necessary, then go to step 8. If connector and terminals are okay, replace BTSI solenoid, then go to step 8.
  8. Ensure all components disconnected or removed during testing are reconnected and installed on vehicle. Ensure BTSI system operates correctly. See «SHIFT INTERLOCK SOLENOID»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system__shift-interlock-solenoid) under DESCRIPTION & OPERATION. If system does not operate correctly, repeat step 1.

"E" & "K" Body (Except Seville)

Note. For Seville models, see "K" BODY (SEVILLE) .

  1. Turn ignition switch to ON position. Connect scan tool to DLC. Select "PZM" (Body Control Module) on scan tool. Check for PZM DTCs. If PZM DTC B2502 or B2503 are present, see BODY CONTROL MODULES - DEVILLE & ELDORADO article in ACCESSORIES & EQUIPMENT. If no PZM DTCs are present, go to next step.
  2. Check PARK/REV fuse (10-amp) in engine compartment fuse/relay center. If PARK/REV fuse is okay, go to next step. If PARK/REV fuse is blown, repair short to ground in circuit between park relay located in rear compartment relay center No. 5 and PARK/REV fuse (10-amp). Replace PARK/REV fuse (10-amp), then go to step 14. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system).
  3. Check CRUISE fuse (10-amp) in underhood fuse/relay center. If CRUISE fuse (10-amp) is okay, go to next step. If CRUISE fuse (10-amp) is blown, repair short to ground in circuit between park relay located in rear compartment relay center No. 5 and CRUISE fuse (10-amp). Replace CRUISE fuse (10-amp), then go to step 14. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system).
  4. Turn ignition switch to OFF position. Remove park relay from rear compartment relay center No. 5. Turn ignition switch to ON position. Measure voltage between park relay harness connector terminal "A1" and ground. If voltage is 10-15 volts, go to next step. If voltage is not 10-15 volts, repair open circuit between park relay terminal "A1" and PARK/REV fuse, then go to step 14. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system).
  5. Measure voltage between park relay harness connector terminal "A3" and ground. If voltage is 10-15 volts, go to next step. If voltage is not 10-15 volts, repair open circuit between park relay terminal "A3" and CRUISE fuse, then go to step 14. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system).
  6. Turn ignition switch to OFF position. Connect a fused jumper between park relay terminal "A1" and "B3". Turn ignition switch to ON position. Move gearshift lever out of "P" position. If gearshift lever is locked in "P" position, go to step 11. If gearshift lever is not locked in "P" position, go to next step.
  7. Leave fused jumper connected. Disconnect brakelight switch 4-pin connector C2. Measure voltage between brakelight switch 4-pin connector C2 terminal "A" and ground. (Scheme 24) If voltage is 10-15 volts, go to next step. If voltage is not 10-15 volts, repair open in circuit between park relay terminal "B3" and brakelight switch 4-pin connector C2 terminal "A", then go to step 14. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system).
  8. Measure voltage between brakelight switch 4-pin connector C2 terminals "A" and "B". (Scheme 24) If voltage is not 10-15 volts, go to next step. If voltage is 10-15 volts, check brakelight switch 4-pin connector C2 for damaged or loose terminals. Ensure switch is adjusted correctly. Repair as necessary. If connector and terminals are okay and switch is adjusted correctly, replace brakelight switch, then go to step 14.
  9. Reconnect brakelight switch 4-pin connector C2. Disconnect BTSI solenoid connector. Measure voltage between BTSI solenoid connector terminal "A" and ground. (Scheme 25) If voltage is 10-15 volts, go to next step. If voltage is not 10-15 volts, repair open circuit between brakelight switch 4-pin connector C2 terminal "B" and BTSI solenoid connector terminal "A", then go to step 14. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system).
  10. Measure voltage between BTSI solenoid connector terminals "A" and "B". (Scheme 25) If voltage is 10-15 volts, check BTSI solenoid connector for damaged or loose terminals. Repair as necessary. If connector and terminals are okay, replace BTSI solenoid, then go to step 14. If voltage is not 10-15 volts, repair open circuit between BTSI solenoid connector terminal "B" and ground, then go to step 14. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system).
  11. Turn ignition switch to OFF position. Remove fused jumper and install park relay. Turn ignition switch to ON position. Using scan tool, select PZM, then select PZM Data. If PZM Data indicates gearshift lever is in "P" position, go to next step. If PZM Data does not indicate gearshift lever in "P" position, see ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - GASOLINE - EXCEPT METRO & FIREFLY (CANADIAN), PRIZM & TRACKER in ENGINE PERFORMANCE.
  12. Turn ignition switch to OFF position. Disconnect PZM 32-pin connector C2. Connect a fused jumper between PZM connector C2 terminal "C15" and ground. Turn ignition switch to ON position. Move gearshift lever out of "P" position. If gearshift lever is locked in "P" position, go to next step. If gearshift lever is not locked in "P" position, check PZM connector for damaged or loose terminals. If connector and terminals are okay, replace PZM, then go to step 14.
  13. Check for open circuit between PZM and park relay. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system). Repair as necessary, then go to next step. If circuit is okay, check park relay connector for damaged or loose terminals. If park relay connector and terminals are okay, replace park relay, then go to next step.
  14. Ensure all components disconnected or removed during testing are reconnected and installed on vehicle. Ensure BTSI system operates correctly. See «SHIFT INTERLOCK SOLENOID»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system__shift-interlock-solenoid) under DESCRIPTION & OPERATION. If system does not operate correctly, repeat step 1.

"F" Body (Camaro & Firebird)

  1. Connect scan tool to DLC. Turn ignition switch to ON position. Check for DTCs. If engine DTCs are present, see ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - GASOLINE - EXCEPT METRO & FIREFLY (CANADIAN), PRIZM & TRACKER in ENGINE PERFORMANCE. If DTCs are not present, ensure Brake Transmission/Transaxle Shift Interlock (BTSI) system operates correctly, then go to next step. See «SHIFT INTERLOCK SOLENOID»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system__shift-interlock-solenoid) under DESCRIPTION & OPERATION.
  2. Place gearshift lever in "P" position. Disconnect BTSI solenoid connector. Turn ignition switch to ON position. Connect test light between BTSI solenoid connector terminal "B" and ground. (Scheme 25) If test light illuminates, go to next step. If test light does not illuminate, go to step 5.
  3. Connect test light between BTSI solenoid connector terminals "A" and "B". (Scheme 25) If test light illuminates, replace BTSI solenoid, then go to step 7. If test light does not illuminate, go to next step.
  4. Check operation of rear hatch release system. If rear hatch release system operates correctly, repair open in circuit between BTSI solenoid connector terminal "A" and splice S239, then go to step 7. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system). If rear hatch release system does not operate correctly, repair connection or open circuit between splices S239 and S234, then go to step 7. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system).
  5. Using a test light, backprobe between brakelight switch 4-pin connector C2 terminal "B" and ground. If test light does not illuminate, go to next step. If test light illuminates, repair open circuit between brakelight switch 4-pin connector C2 terminal "B" and BTSI solenoid connector terminal "B", then go to step 7. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system).
  6. Using a test light, backprobe between brakelight switch 4-pin connector C2 terminal "A" and ground. If test light illuminates, replace brakelight switch, then go to next step. If test light does not illuminate, repair open circuit between brakelight switch 4-pin connector C2 terminal "A" and splice S206, then go to next step. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system).
  7. Ensure all components disconnected or removed during testing are reconnected and installed on vehicle. Ensure BTSI system operates correctly. See «SHIFT INTERLOCK SOLENOID»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system__shift-interlock-solenoid) under DESCRIPTION & OPERATION. If system does not operate correctly, repeat step 1.

"G" Body (Aurora & Riviera)

  1. Turn ignition switch to ON position. Place gearshift lever in "P" position. Disconnect Park Neutral Position (PNP) switch 7-pin connector. Using test lamp, jumper between PNP switch connector terminal "B" and ground. (Scheme 27) If test light illuminates, go to next step. If test light does not illuminate, go to step 3.
  2. Connect a fused jumper between PNP switch connector terminals "B" and "C". (Scheme 27) Without applying brake pedal, move gearshift lever out of "P" position. If gearshift lever is locked in "P" position, check PNP switch connector for damaged or loose terminals. If connector and terminals are okay, replace PNP switch, then go to step 8. If gearshift lever is not locked in "P" position, go to step 4.
  3. Check TMNSS fuse (15-amp) located in dash fuse block. If fuse is okay, check for open circuit between TMNSS fuse and PNP switch terminal "B", then go to step 8. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system). If fuse is blown, repair short to ground in circuit between TMNSS fuse and PNP switch terminal "B", replace TMNSS fuse, then go to step 8. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system).
  4. Reconnect PNP switch 7-pin connector. Disconnect brakelight switch 4-pin connector C1. Using test light, jumper between brakelight switch 4-pin connector C1 terminal "A" and ground. (Scheme 24) If test light illuminates, go to next step. If test light does not illuminate, repair open circuit between PNP switch connector terminal "C" and brakelight switch 4-pin connector C1 terminal "A", then go to step 8. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system).
  5. Connect test light between brakelight switch 4-pin connector C2 terminals "A" and "B". If test light does not illuminate, go to next step. If test light illuminates, check brakelight switch 4-pin connector C2 for damaged or loose terminals. Repair as necessary, then go to step 8. If brakelight switch 4-pin connector C2 and terminals are okay, replace brakelight switch, then go to step 8.
  6. Reconnect brakelight switch 4-pin connector. Disconnect BTSI solenoid connector. Connect test light between shift interlock connector terminal "A" and ground. (Scheme 25) If test light illuminates, go to next step. If test light does not illuminate, repair open circuit between BTSI solenoid connector terminal "A" and brakelight switch 4-pin connector C2 terminal "B", then go to step 8. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system).
  7. Connect test light between shift interlock connector terminals "A" and "B". (Scheme 25) If test light illuminates, check BTSI solenoid connector for damaged or loose terminals. If BTSI solenoid connector and terminals are okay, replace BTSI solenoid, then go to next step. If test light does not illuminate, check ground (G200) connector located behind left kick panel for damaged or loose terminal. If ground G200 is okay, repair open circuit between BTSI solenoid and ground G200, then go to next step. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system).
  8. Ensure all components disconnected or removed during testing are reconnected and installed on vehicle. Ensure BTSI system operates correctly. See «SHIFT INTERLOCK SOLENOID»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system__shift-interlock-solenoid) under DESCRIPTION & OPERATION. If system does not operate correctly, repeat step 1.

"H" Body (Bonneville, Eighty Eight, LeSabre, & LSS)

  1. Turn ignition switch to ON position. Place gearshift lever in "P" position. Disconnect Park Neutral Position (PNP) switch 7-pin connector. Measure voltage between PNP connector terminal "B" and ground. (Scheme 28) If voltage is 10-15 volts, go to next step. If voltage is not 10-15 volts, go to step 3.
  2. Connect a fused jumper between PNP switch connector terminals "B" and "C". (Scheme 28) Without applying brake pedal, move gearshift lever out of "P" position. If gearshift lever is locked in "P" position, go to step 4. If gearshift lever is not locked in "P" position, check PNP switch connector for damaged or loose terminals. If connector and terminals are okay, replace PNP switch, then go to step 8.
  3. Check TSIG/BULP BTSI fuse 1B (20-amp) located in instrument panel fuse block. If fuse is blown, repair short to ground in power circuit to BTSI solenoid, then go to step 8. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system). If fuse is okay, repair open circuit between PNP switch and TSIG/BULPS BTSI fuse 1B, then go to step 8. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system).
  4. Reconnect PNP switch connector. Disconnect brakelight switch 4-pin connector C1. Measure voltage between brakelight switch 4-pin connector C1 terminal "A" and ground. (Scheme 24) If voltage is 10-15 volts, go to next step. If voltage is not 10-15 volts, repair open circuit between brakelight switch 4-pin connector C1 terminal "A" and PNP switch connector terminal "C", then go to step 8. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system).
  5. Measure voltage between brakelight switch 4-pin connector C1 terminals "A" and "B". (Scheme 24) If voltage is 10-15 volts, go to next step. If voltage is not 10-15 volts, check brakelight switch 4-pin connector C1 for damaged or loose terminals. If connector and terminals are okay, replace brakelight switch, then go to step 8. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system).
  6. Reconnect brakelight switch 4-pin connector C1. Disconnect BTSI solenoid connector. Measure voltage between BTSI solenoid connector terminal "A" and ground. (Scheme 25) If voltage is 10-15 volts, go to next step. If voltage is not 10-15 volts, repair open circuit between BTSI solenoid connector terminal "A" and brakelight switch 4-pin connector C2 terminal "B", then go to step 8. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system).
  7. Measure voltage between BTSI solenoid connector terminals "A" and "B". If voltage is 10-15 volts, check BTSI solenoid connector for damaged or loose terminals. If BTSI solenoid connector and terminals are okay, replace BTSI solenoid, then go to next step. If voltage is not 10-15 volts, check ground G200 connector for damaged or loose terminals. If ground G200 connector terminal is okay, repair open circuit between BTSI solenoid and ground G200, then go to next step. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system).
  8. Ensure all components disconnected or removed during testing are reconnected and installed on vehicle. Ensure BTSI system operates correctly. See «SHIFT INTERLOCK SOLENOID»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system__shift-interlock-solenoid) under DESCRIPTION & OPERATION. If system does not operate correctly, repeat step 1.

"J" Body (Cavalier & Sunfire)

Note. Check ERLS fuse (10-amp) located in dash fuse block, before performing this test. A short to ground in a circuit can cause an open fuse.

  1. Disconnect brakelight switch 4-pin connector C2. Turn ignition switch to ON position. Move gearshift lever out of "P" position. If gearshift lever is locked in "P" position, go to next step. If gearshift lever is not locked in "P" position, check brakelight switch adjustment. If brakelight switch adjustment is okay, replace brakelight switch, then go to step 3 .
  2. Disconnect BTSI solenoid connector. Move gearshift lever out of "P" position. If gearshift lever is not locked in "P" position, repair short to battery in circuit between BTSI solenoid connector terminal "B" and brakelight switch 4-pin connector C2 terminal "B", then go to next step. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system) . If gearshift lever is locked in "P" position, replace BTSI solenoid, then go to next step.
  3. Ensure all components disconnected or removed during testing are reconnected and installed on vehicle. Ensure BTSI system operates correctly. See «SHIFT INTERLOCK SOLENOID»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system__shift-interlock-solenoid) under DESCRIPTION & OPERATION. If system does not operate correctly, repeat step 1 .

"K" Body (Seville)

Note. For DeVille models, see "E" & "K" BODY (EXCEPT SEVILLE) .

  1. Check NSBU fuse (10-amp) located in rear junction block. If fuse is okay, go to next step. If fuse is blown, repair short to ground in circuits or components between NSBU fuse and BTSI solenoid. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system).
  2. Connect scan tool to DLC. Turn ignition switch to ON position and select REAR INTEGRATION MODULE (RIM) on scan tool. Select PARK RELAY under special functions menu. With scan tool, command park relay to cycle ON and OFF. Locate park relay in rear junction block. If no audible click is heard from park relay, go to next step. If audible click is heard from park relay, replace brakelight switch, then go to step 6.
  3. Turn ignition switch to OFF position. Remove park relay. Turn ignition switch to ON position. Using test light, jumper between park relay connector terminal No. 85 and ground. (Scheme 29) If test light illuminates, go to next step. If test light does not illuminate, repair open circuit between park relay terminal No. 85 and ignition switch 6-pin connector terminal "C", then go to step 12. (Scheme 29)and (Scheme 30). See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system).
  4. Using test light, jumper between park relay terminals No. 85 and 86. (Scheme 29) Using scan tool, command park relay ON. If test light does not illuminate, go to next step. If test light illuminates, check park relay connector for damaged, corroded or loose terminals. Repair terminals as necessary, then go to step 12. If connector and terminals are okay, replace park relay, then go to step 12.
  5. Check for open circuit, short to battery or poor connections between park relay connector terminal No. 86 and Rear Integration Module (RIM) 24-pin connector C2 terminal "B2". (Scheme 29)and (Scheme 36). See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system). Repair as necessary, then go to step 12. If circuit and connectors are okay, replace RIM. Recalibrate RIM using Drivers Information Center (DIC), then go to step 12. See «REAR INTEGRATION MODULE (RIM)»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system__rear-integration-module-rim) under PROGRAMMING PROCEDURE.
  6. Turn ignition switch to OFF position. Remove park relay. Turn ignition switch to ON position. Using test light, jumper between park relay terminal No. 30 and ground. If test light illuminates, go to next step. If test light does not illuminate, repair open circuit between park relay connector terminal No. 30 and NSBU fuse (10-amp), then go to step 12. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system).
  7. Connect 10-amp fused jumper between park relay connector terminals No. 30 and 87. Set parking brake. Move gearshift lever out of "P" position. If gearshift lever is locked in "P" position, go to next step. If gearshift lever is not locked in "P" position, check for damaged or loose terminals at park relay connector. Repair as necessary, then go to step 12. If park relay terminals and connector are okay, replace park relay, then go to step 12.
  8. Leave fused jumper connected across park relay terminals No. 30 and 87. Using test light, jumper between brakelight switch 4-pin connector C2 terminal "A" and ground. (Scheme 24) If test light illuminates, go to next step. If test light does not illuminate, repair open circuit between brakelight switch 4-pin connector C2 terminal "A" and park relay connector terminal No. 87, then go to step 12. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system).
  9. Leave fused jumper connected across park relay terminals No. 30 and 87. Connect another 10-amp fused jumper between brakelight switch 4-pin connector C2 terminals "A" and "B". (Scheme 24) Move gearshift lever out of "P" position. If gearshift lever is locked in "P" position, go to next step. If gearshift lever is not locked in "P" position, check for incorrectly adjusted brakelight switch, or damaged or loose terminals at brakelight switch. Repair as necessary, then go to step 12. If brakelight switch is adjusted correctly and brakelight switch terminals and connector are okay, replace brakelight switch, then go to step 12.
  10. Disconnect BTSI solenoid connector. Using test light, jumper between BTSI connector terminal "A" and ground. (Scheme 25) If test light illuminates, go to next step. If test light does not illuminate, repair open circuit between brakelight switch 4-pin connector C2 terminal "B" and BTSI solenoid terminal "A", then go to step 12. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system).
  11. Connect test light between BTSI solenoid connector terminals "A" and "B". (Scheme 25) If test light illuminates, check for damaged or loose terminals at BTSI solenoid connector. Repair as necessary, then go to step 12. If connector and terminals are okay, replace BTSI solenoid, then go to step 12. If test light does not illuminate, repair open between BTSI solenoid connector terminal "B" and ground (G200) located behind left kick panel, then go to step 12. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system).
  12. Ensure all components disconnected or removed during testing are reconnected and installed on vehicle. Ensure BTSI system operates correctly. See «SHIFT INTERLOCK SOLENOID»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system__shift-interlock-solenoid) under DESCRIPTION & OPERATION. If system does not operate correctly, repeat step 1.

"N" Body (Alero & Grand Am)

Note. Before performing following test, check BULMP/BTSI fuse (15-amp) located in underhood junction block. A short to ground in a circuit can cause an open fuse.

  1. Using test light, jumper between battery power side of BULMP/BTSI fuse (15-amp) and ground. If test light illuminates, go to next step. If test light does not illuminate, repair open in POWER SUPPLY circuit to BULMP/BTSI fuse (15-amp), then go to step 6.
  2. Disconnect brakelight switch 4-pin connector. Connect a fused jumper between brakelight switch 4-pin connector C2, terminals "A" and "B". (Scheme 24) Turn ignition switch to ON position. DO NOT apply brake pedal. Move gearshift lever out of "P" position. If gearshift lever is locked in "P" position, go to next step. If gearshift lever is not locked in "P" position, check brakelight switch adjustment. If brakelight switch adjustment is correct, replace brakelight switch, then go to step 6.
  3. Check for open circuit between Park Neutral Position (PNP) switch 7-pin connector terminal "C" and brakelight switch 4-pin connector C2 terminal "A". Check for open circuit between brakelight switch 4-pin connector C2 terminal "B" and BTSI solenoid connector terminal "A". (Scheme 24), (Scheme 25) or (Scheme 28). See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system). Repair as necessary, then go to step 6. If circuits are okay, go to next step.
  4. Check for open circuit between BTSI solenoid connector terminal "B" and ground (G201) located right side of dash. Check for open in power supply circuit between PNP switch 7-pin connector terminal "B" and underhood junction block Grey connector C1 terminal "F5". (Scheme 25), (Scheme 28) or (Scheme 31). See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system). Repair as necessary, then go to step 6. If circuits are okay, go to next step.
  5. Check BTSI solenoid or related linkage for mechanical binding. Repair as necessary, then go to step 6. If linkage and BTSI solenoid are okay, disconnect BTSI solenoid connector. Turn ignition switch to ON position. Using test light, jumper between BTSI solenoid terminals "A" and "B". (Scheme 25) If test light illuminates, replace BTSI solenoid, then go to next step. If test light does not illuminate, replace PNP switch, then go to next step.
  6. Ensure all components disconnected or removed during testing are reconnected and installed on vehicle. Ensure BTSI system operates correctly. See «SHIFT INTERLOCK SOLENOID»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system__shift-interlock-solenoid) under DESCRIPTION & OPERATION. If system does not operate correctly, repeat step 1.

"N" Body (Cutlass & Malibu)

Note. Before performing the following test, check NSBU fuse (10-amp) located in underhood junction block. A short to ground in a circuit can cause an open fuse.

  1. Using test light, jumper between battery power side of NSBU fuse (10-amp) and ground. If test light illuminates, go to next step. If test light does not illuminate, repair open in power supply circuit to NSBU fuse (10-amp), then go to step 6.
  2. Disconnect brakelight switch 4-pin connector C2. Connect a fused jumper between brakelight switch 4-pin connector C2 terminals "A" and "B". (Scheme 24) Turn ignition switch to ON position. DO NOT apply brake pedal. Move gearshift lever out of "P" position. If gearshift lever is locked in "P" position, go to next step. If gearshift lever is not locked in "P" position, check brakelight switch adjustment. If brakelight switch adjustment is correct, replace brakelight switch, then go to step 6.
  3. Check for open circuit between Park Neutral Position (PNP) switch 7-pin connector terminal "C" and brakelight switch 4-pin connector C2 terminal "A". Check for open circuit between brakelight switch 4-pin connector C2 terminal "B" and BTSI solenoid connector terminal "A". (Scheme 24), (Scheme 25) or (Scheme 28). See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system). Repair as necessary, then go to step 6. If circuits are okay, go to next step.
  4. Check for open circuit between BTSI solenoid connector terminal "B" and ground (G201) located right side of dash. Check for open in power supply circuit between PNP switch 7-pin connector terminal "B" and underhood junction block Grey connector C1 terminal "F5". (Scheme 25), (Scheme 28) or (Scheme 31). See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system). Repair as necessary, then go to step 6. If circuits are okay, go to next step.
  5. Check BTSI solenoid or related linkage for mechanical binding. Repair as necessary, then go to next step. If linkage and BTSI solenoid are okay, disconnect BTSI solenoid connector. Turn ignition switch to ON position. Using test light, jumper between BTSI solenoid terminals "A" and "B". (Scheme 25) If test light illuminates, replace BTSI solenoid, then go to next step. If test light does not illuminate, replace PNP switch, then go to next step.
  6. Ensure all components disconnected or removed during testing are reconnected and installed on vehicle. Ensure BTSI system operates correctly. See «SHIFT INTERLOCK SOLENOID»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system__shift-interlock-solenoid) under DESCRIPTION & OPERATION. If system does not operate correctly, repeat step 1.

"S" Body (Prizm)

  1. Disconnect shift lock control module 5-pin connector (located under center console). Measure voltage between shift lock control module connector terminal No. 2 and ground while applying brake pedal. If voltage is 10-14 volts, replace shift lock control module, then go to step 3. If voltage is not 10-14 volts, go to next step.
  2. Repair open in BRAKE SIGNAL circuit between shift lock control module connector terminal No. 5 and terminal No. 21 of Gray connector C2 located in junction block No. 3 behind center of instrument panel, then go to next step. (Scheme 32)and (Scheme 33). See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system).
  3. Ensure all components disconnected or removed during testing are reconnected and installed on vehicle. Ensure BTSI system operates correctly. See «SHIFT INTERLOCK SOLENOID»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system__shift-interlock-solenoid) under DESCRIPTION & OPERATION. If system does not operate correctly, repeat step 1.

"V" Body (Catera)

Note. Before performing the following tests, check for mechanical binding or foreign material that may be preventing BTSI solenoid from operating correctly.

  1. Disconnect in-line 9-pin connector C205, located on gearshift lever control base, to right of gearshift lever. Turn ignition switch to ON position. Measure voltage between female side of in-line connector C205 terminal No. 8 and ground while applying brake pedal. (Scheme 34) If battery voltage is present, go to step 3. If battery voltage is not present, go to next step.
  2. Check for open circuits or high resistance between connector C205 terminal No. 8 and CLAMP 15 A/T FUSE No. 2 (10-amp), then go to step 6. Repair as necessary. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system). If circuits are okay, replace brakelight switch, then go to step 6.
  3. Measure resistance between female side of in-line connector C205 terminal No. 6 and ground. (Scheme 34) If resistance is less than 2 ohms, go to next step. If resistance is 2 ohms or more, check for open or high resistance in circuit between in-line connector C205 terminal No. 6 and splice S250 located near instrument cluster connector branch off. Repair as necessary, then go to step 6. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system).
  4. Measure resistance between in-line connector C205 terminals No. 6 and 7. (Scheme 34) If resistance is 2 ohms or more, go to next step. If resistance is less than 2 ohms, check for open, faulty diode or high resistance in circuits between in-line connector C205 terminal No. 7 and automatic transmission shift lock control solenoid. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system). Repair as necessary, then go to step 6. If circuits are okay, replace automatic transmission shift lock control solenoid, then go to step 6.
  5. Check for open circuits or high resistance between in-line connector C205 terminal No. 7, automatic transmission shift lock control switch and terminal No. 6 of in-line connector C205. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system). Repair as necessary, then go to next step. If circuits are okay, replace automatic transmission shift lock control switch, then go to next step.
  6. Ensure all components disconnected or removed during testing are reconnected and installed on vehicle. Ensure BTSI system operates correctly. See «SHIFT INTERLOCK SOLENOID»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system__shift-interlock-solenoid) under DESCRIPTION & OPERATION. If system does not operate correctly, repeat step 1.

"W" Body (Century)

Note. Before performing the following test, ensure BTSI PARK LOCK fuse (10-amp) is okay. A short to ground in BTSI solenoid power circuit can cause an open fuse.

  1. Ensure gearshift lever is in "P" position. Turn ignition switch to ON position. Disconnect BTSI solenoid connector. Using a test light, jumper between BTSI solenoid connector terminal "A" and ground. (Scheme 26) Depress brake pedal. If test light does not illuminate, go to next step. If test light illuminates, go to step 3.
  2. Disconnect brakelight switch 4-pin connector C2. Leave test light connected between BTSI solenoid connector terminal "A" and ground. If test light does not illuminate, replace brakelight switch, then go to step 6. If test light illuminates, repair short to battery power in circuit between brakelight switch 4-pin connector C2 terminal "B" and BTSI solenoid connector terminal "A", then go to step 6. (Scheme 24)and (Scheme 26). See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system).
  3. Using test light, jumper between BTSI solenoid connector terminal "B" and battery power. (Scheme 26) If test light does not illuminate, go to next step. If test light does illuminate, replace BTSI solenoid, then go to step 6.
  4. Disconnect Transaxle Range (TR) switch 7-pin connector. Connect test light between TR connector terminal "D" and battery power. (Scheme 28) If test light illuminates, go to next step. If test light does not illuminate, repair poor connection or open circuit between TR switch 7-pin connector, terminal "D" and ground (G129) located on transaxle stud, then go to step 6. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system).
  5. Check for poor connection or open circuit between TR switch connector terminal "A" and BTSI solenoid connector terminal "B". (Scheme 26)and (Scheme 28). See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system). Repair as necessary, then go to next step. If circuit and connections are okay, replace TR switch, then go to next step.
  6. Ensure all components disconnected or removed during testing are reconnected and installed on vehicle. Ensure BTSI system operates correctly. See «SHIFT INTERLOCK SOLENOID»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system__shift-interlock-solenoid) under DESCRIPTION & OPERATION. If system does not operate correctly, repeat step 1.

"W" Body (Grand Prix - With Column Shift)

  1. Ensure gearshift lever is in "P" position. Turn ignition switch to ON position. Disconnect BTSI solenoid connector. Using a test light, jumper between BTSI solenoid connector terminal "A" and ground. (Scheme 26) DO NOT apply brake pedal. If test light does not illuminate, go to next step. If test light illuminates, go to step 4.
  2. Disconnect brakelight switch 4-pin connector C2. Connect test light between brakelight switch 4-pin connector C2 terminal "B" and ground. (Scheme 24) If test light does not illuminate, go to next step. If test light illuminates, repair open circuit between brakelight switch 4-pin connector C2 terminal "B" and BTSI solenoid connector terminal "A", then go to step 7. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system).
  3. Check for an open circuit between brakelight switch 4-pin connector C2 terminal "A" and BTSI fuse (10-amp). See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system). Repair as necessary, then go to step 7. If circuit is okay, replace brakelight switch, then go to step 7.
  4. Connect test light between BTSI solenoid connector terminal "B" and battery power. (Scheme 26) If test light does not illuminate, go to next step. If test light does illuminate, replace BTSI solenoid, then go to step 7.
  5. Disconnect Park Neutral Position (PNP) switch 7-pin connector. Connect test light between PNP connector terminal "D" and battery power. (Scheme 28) If test light illuminates, go to next step. If test light does not illuminate, repair poor connection or open circuit between PNP switch and ground located on transaxle stud (G129), then go to step 7. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system).
  6. Check for poor connection or open circuit between PNP switch connector terminal "A" and BTSI solenoid connector terminal "B". (Scheme 26)and (Scheme 28). See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system). Repair as necessary, then go to next step. If circuit and connections are okay, replace PNP switch, then go to next step.
  7. Ensure all components disconnected or removed during testing are reconnected and installed on vehicle. Ensure BTSI system operates correctly. See «SHIFT INTERLOCK SOLENOID»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system__shift-interlock-solenoid) under DESCRIPTION & OPERATION. If system does not operate correctly, repeat step 1.

"W" Body (Grand Prix - With Floor Shift)

  1. Ensure gearshift lever is in "P" position. Turn ignition switch to ON position. Disconnect automatic transaxle control 6-pin connector. Using a test light, jumper between automatic transaxle control connector terminal "E" and ground. (Scheme 38) DO NOT apply brake pedal. If test light does not illuminate, go to next step. If test light illuminates, go to step 4.
  2. Disconnect brakelight switch 4-pin connector C2. Connect test light between brakelight switch 4-pin connector C2 terminal "B" and ground. (Scheme 24) If test light does not illuminate, go to next step. If test light illuminates, check for an open circuit between brakelight switch 4-pin connector C2 terminal "B" and automatic transaxle control connector terminal "E". See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system). Repair as necessary, then go to step 8.
  3. Check for an open circuit between brakelight switch 4-pin connector C2, terminal "A" and BTSI fuse (10-amp). See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system). Repair as necessary, then go to step 8. If circuit is okay, replace brakelight switch, then go to step 8.
  4. Connect test light between automatic transaxle control connector terminal "B" and ground. (Scheme 38) If test light illuminates, go to next step. If test light does not illuminate, check for an open circuit between BTSI fuse (10-amp) and automatic transaxle control connector terminal "B". See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system). Repair as necessary, then go to step 8.
  5. Connect test light between automatic transaxle control connector terminal "A" and battery power. (Scheme 38) If test light does not illuminate, go to next step. If test light illuminates, replace park lock solenoid, then go to step 8.
  6. Disconnect Park Neutral Position (PNP) switch 7-pin connector. Connect test light between PNP connector terminal "D" and battery power. (Scheme 28) If test light illuminates, go to next step. If test light does not illuminate, repair poor connection or open circuit between PNP switch and ground (G129) located on transaxle stud. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system). Repair as necessary, then go to step 8.
  7. Check for poor connection or open circuit between PNP switch connector terminal "A" and automatic transaxle control connector terminal "A". (Scheme 28)and (Scheme 38). See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system). Repair as necessary, then go to next step. If circuit and connections are okay, replace PNP switch, then go to next step.
  8. Ensure all components disconnected or removed during testing are reconnected and installed on vehicle. Ensure BTSI system operates correctly. See «SHIFT INTERLOCK SOLENOID»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system__shift-interlock-solenoid) under DESCRIPTION & OPERATION. If system does not operate correctly, repeat step 1.

"W" Body (Intrigue)

  1. Place gearshift lever in "P" position. Turn ignition switch to ON position. Disconnect BTSI solenoid connector. Using test light, backprobe between BTSI solenoid connector terminal "A"and ground. (Scheme 25) Apply brake pedal. If test light illuminates, go to next step. If test light does not illuminate, replace BTSI solenoid, then go to step 4.
  2. Leave test light connected between BTSI solenoid connector terminal "A"and ground. Disconnect brakelight switch 4-pin connector C2. If test light illuminates, go to next step. If test light does not illuminate, check brakelight switch adjustment. If brakelight switch adjustment is okay, replace brakelight switch, then go to step 4.
  3. Check for short to battery power in circuit between brakelight switch 4-pin connector C2 terminal "B" and BTSI solenoid connector terminal "A". (Scheme 24)and (Scheme 25). See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system). Repair as necessary, then go to step 4.
  4. Ensure all components disconnected or removed during testing are reconnected and installed on vehicle. Ensure BTSI system operates correctly. See «SHIFT INTERLOCK SOLENOID»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system__shift-interlock-solenoid) under DESCRIPTION & OPERATION. If system does not operate correctly, repeat step 1.

"W" Body (Lumina & Monte Carlo)

  1. Ensure gearshift lever is in "P" position. Turn ignition switch to ON position. Disconnect BTSI solenoid connector. Apply brake pedal. Using test light, backprobe between BTSI solenoid connector terminal "A" and ground. (Scheme 25) If test light illuminates, go to next step. If test light does not illuminate, check BTSI solenoid linkage for mechanical damage. Repair as necessary, then go to step 3. If BTSI solenoid linkage is okay, replace BTSI solenoid, then go to step 3.
  2. Leave test light connected between BTSI solenoid connector terminal "A" and ground. Disconnect brakelight switch 4-pin connector C2. If test light stays illuminated, repair short to battery power in circuit between brakelight switch 4-pin connector C2 terminal "B" and BTSI solenoid connector terminal "A", then go to next step. (Scheme 24) See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system). If test light does not illuminate, check brakelight switch adjustment. Adjust brakelight switch as necessary. If adjustment is okay, replace brakelight switch, then go to next step.
  3. Ensure all components disconnected or removed during testing are reconnected and installed on vehicle. Ensure BTSI system operates correctly. See «SHIFT INTERLOCK SOLENOID»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system__shift-interlock-solenoid) under DESCRIPTION & OPERATION. If system does not operate correctly, repeat step 1.

"W" Body (Regal)

Note. Before performing the following test, ensure BTSI PARK LOCK fuse (10-amp) is okay. A short to ground in a circuit can cause an open fuse.

  1. Ensure gearshift lever is in "P" position. Turn ignition switch to ON position. Disconnect BTSI solenoid connector. Using a test light, jumper between BTSI solenoid connector terminal "E" and ground. (Scheme 26) Depress brake pedal. If test light does not illuminate, go to next step. If test light illuminates, go to step 3.
  2. Disconnect brakelight switch 4-pin connector C2. Leave test light connected between BTSI solenoid connector terminal "A" and ground. If test light does not illuminate, replace brakelight switch, then go to step 6. If test light illuminates, repair short to battery power in circuit between brakelight switch 4-pin connector C2 terminal "B" and BTSI solenoid connector terminal "A", then go to step 6. (Scheme 24)and (Scheme 26). See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system).
  3. Using test light, jumper between BTSI solenoid connector terminal "B" and battery power. (Scheme 26) If test light does not illuminate, go to next step. If test light does illuminate, replace BTSI solenoid, then go to step 6.
  4. Disconnect Transaxle Range (TR) switch 7-pin connector. Connect test light between TR connector terminal "D" and battery power. (Scheme 28) If test light illuminates, go to next step. If test light does not illuminate, repair poor connection or open circuit between TR switch 7-pin connector terminal "D" and ground (G129) located on transaxle stud, then go to step 6. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system).
  5. Check for poor connection or open circuit between TR switch connector terminal "A" and BTSI solenoid connector terminal "B". (Scheme 26)and (Scheme 28). See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system). Repair as necessary, then go to next step. If circuit and connections are okay, replace TR switch, then go to next step.
  6. Ensure all components disconnected or removed during testing are reconnected and installed on vehicle. Ensure BTSI system operates correctly. See «SHIFT INTERLOCK SOLENOID»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system__shift-interlock-solenoid) under DESCRIPTION & OPERATION. If system does not operate correctly, repeat step 1.

"Y" Body

  1. Disconnect Park Neutral Position (PNP) switch 7-pin connector. Turn ignition switch to ON position. Measure voltage between PNP switch 7-pin connector terminal "C" and ground. (Scheme 28) If voltage is 10-14 volts, go to next step. If voltage is not 10-14 volts, go to step 7.
  2. Place gearshift lever in "P" position. Check for continuity between PNP switch 7-pin connector terminal "B" and "C" (component side). If continuity is present, go to next step. If continuity is not present, check PNP switch adjustment. Adjust as necessary, recheck for continuity, then go to step 11. If adjustment is okay, replace PNP switch, then go to step 11.
  3. Disconnect brakelight switch 4-pin connector C2. Check for continuity between brakelight switch 4-pin connector C2 terminal "A" and PNP switch 7-pin connector terminal "B". (Scheme 25)and (Scheme 28). If continuity is present, go to next step. If continuity is not present, repair open in circuit between brakelight switch 4-pin connector C2 terminal "A" and PNP switch 7-pin connector terminal "B", then go to step 11. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system).
  4. Check for continuity between brakelight switch 4-pin connector C2 terminals "A" and "B". (Scheme 25) DO NOT apply brake pedal. If continuity is present, go to next step. If continuity is not present, check brakelight switch adjustment. Adjust as necessary, then go to step 11. If adjustment is okay, replace brakelight switch, then go to step 11.
  5. Disconnect BTSI solenoid 4-pin connector. Check for continuity between BTSI solenoid 4-pin connector terminal "C" and brakelight switch 4-pin connector C2 terminal "B". (Scheme 25)and (Scheme 41). If continuity is present, go to next step. If continuity is not present, check for an open in circuit between BTSI solenoid 4-pin connector terminal "C" and brakelight switch 4-pin connector C2 terminal "B". See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system). Repair as necessary, then go to step 11.
  6. Measure resistance between BTSI solenoid 4-pin connector terminal "D" and ground. (Scheme 41) If resistance is less than.5 ohm, replace BTSI solenoid, then go to step 11. If resistance is.5 ohm or more, repair open in circuit between BTSI solenoid 4-pin connector terminal "D" and ground (G203) located behind right kick panel. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system). Repair as necessary, then go to step 11.
  7. Check BTSI BU minifuse® No. 21 (10-amp) for an open. If fuse is blown, go to next step. If fuse is okay, check for an open in circuit between BTSI BU minifuse® (10-amp) terminal "A" and PNP switch 7-pin connector terminal "C". (Scheme 28) See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system). Repair as necessary, then go to step 11.
  8. Remove BTSI BU minifuse® No. 21 (10-amp). Ensure PNP switch 7-pin connector is disconnected. Check for continuity between PNP switch 7-pin connector terminal "C" and ground. (Scheme 28) If continuity is not present, go to next step. If continuity is present, repair short to ground in circuit between PNP switch 7-pin connector terminal "C" and BTSI BU minifuse® No. 21 (10-amp) terminal "A". See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system). Repair as necessary, then go to step 11.
  9. Disconnect brakelight switch 4-pin connector C2. Check for continuity between PNP switch 7-pin connector terminal "B" and ground. (Scheme 28) If continuity is not present, go to next step. If continuity is present, check for short to ground in circuit between PNP switch 7-pin connector terminal "B" and brakelight switch 4-pin connector C2 terminal "A". See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system). Repair as necessary, then go to step 11.
  10. Check for short to ground in circuit between brakelight switch 4-pin connector C2 terminal "B" and BTSI solenoid 4-pin connector terminal "B". (Scheme 25)and (Scheme 41). See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system). Repair as necessary, then go to next step.
  11. Ensure all components disconnected or removed during testing are reconnected and installed on vehicle. Ensure BTSI system operates correctly. See «SHIFT INTERLOCK SOLENOID»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system__shift-interlock-solenoid) under DESCRIPTION & OPERATION. If system does not operate correctly, repeat step 1.

SHIFT LOCK CONTROL ALWAYS ON (IGNITION IN ON POSITION)

Note. Diagnostic information is not available for "A" and "M" body vehicles.

Note. Ensure Brake Transmission/Transaxle Shift Interlock (BTSI) system operates correctly before performing following tests. See SHIFT INTERLOCK SOLENOID under DESCRIPTION & OPERATION.

  1. Turn ignition switch to ON position. Connect scan tool to DLC. Select "SBM" (Body Control Module) on scan tool. Check for SBM DTCs. If any SBM DTCs are present, see BODY CONTROL MODULES - PARK AVENUE article in ACCESSORIES & EQUIPMENT. If no SBM DTCs are present, go to next step.
  2. With ignition switch in ON position, place gearshift lever in "P" position. Disconnect brakelight switch 4-pin connector C1. Depress and hold brake pedal. Move gearshift lever to "N" position. If gearshift lever is not locked in "P" position, replace brakelight switch, then go to step 4. If gearshift lever is locked in "P" position, go to next step.
  3. Measure voltage between brakelight switch 4-pin connector C1 terminal "B" and ground. (Scheme 24) If voltage is more than.5 volt, check for short to voltage in BTSI solenoid power circuit between BTSI solenoid connector terminal "A" and brakelight switch 4-pin connector C1 terminal "B". Repair as necessary, then go to next step. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system). If voltage is.5 volt or less, replace BTSI solenoid, then go to next step.
  4. Ensure all components disconnected or removed during testing are reconnected and installed on vehicle. Ensure BTSI system operates correctly. See «SHIFT INTERLOCK SOLENOID»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system__shift-interlock-solenoid) under DESCRIPTION & OPERATION. If system does not operate correctly, repeat step 1.
  1. Turn ignition switch to ON position. Connect scan tool to DLC. Select "PZM" (Body Control Module) on scan tool. Check for PZM DTCs. If PZM DTC B2502 or B2503 are present, see BODY CONTROL MODULES - DEVILLE & ELDORADO article in ACCESSORIES & EQUIPMENT. If no PZM DTCs are present, go to next step.
  2. Disconnect brakelight switch 4-pin connector C2. Move gearshift lever to "N" position. If gearshift lever is not locked in "P" position, go to next step. If gearshift lever is locked in "P" position, check brakelight switch adjustment and brakelight switch 4-pin connector C2 for damaged or loose terminals. If connector and terminals are okay and switch is adjusted correctly, replace brakelight switch, then go to step 4 .
  3. Turn ignition switch to OFF position. Disconnect BTSI solenoid connector. Turn ignition switch to ON position. Measure voltage between BTSI solenoid connector terminal "A" and ground. If voltage is 10-15 volts, repair short to battery in circuit between BTSI solenoid connector terminal "A" and brakelight switch 4-pin connector terminal "B", then go to next step. If voltage is not 10-15 volts, check BTSI solenoid connector for damaged or loose terminals. If connector and terminals are okay, replace BTSI solenoid, then go to next step.
  4. Ensure all components disconnected or removed during testing are reconnected and installed on vehicle. Ensure BTSI system operates correctly. See «SHIFT INTERLOCK SOLENOID»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system__shift-interlock-solenoid) under DESCRIPTION & OPERATION. If system does not operate correctly, repeat step 1 .
  1. Disconnect brakelight switch 4-pin connector C2. Turn ignition switch to ON position. Using test light, backprobe between BTSI solenoid connector terminal "B" and ground. (Scheme 25) If test light illuminates, repair short to battery in circuit between brakelight switch 4-pin connector C2 terminal "B" and BTSI solenoid connector terminal "B", then go to step 3. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system). If test light does not illuminate, go to next step.
  2. Turn ignition switch to OFF position. Reconnect brakelight switch 4-pin connector C2. Turn ignition switch to ON position. Using test light, backprobe between BTSI solenoid connector terminal "B" and ground. (Scheme 25) Depress brake pedal. If test light illuminates, replace brakelight switch, then go to next step. If test light does not illuminate, replace BTSI solenoid, then go to next step.
  3. Ensure all components disconnected or removed during testing are reconnected and installed on vehicle. Ensure BTSI system operates correctly. See «SHIFT INTERLOCK SOLENOID»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system__shift-interlock-solenoid) under DESCRIPTION & OPERATION. If system does not operate correctly, repeat step 1.
  1. Turn ignition switch to ON position. Ensure gearshift lever is in "P" position. Disconnect brakelight switch 4-pin connector C1. Depress brake pedal and hold. Move gearshift lever out of "P" position. If gearshift lever is locked in "P" position, go to next step. If gearshift lever is not locked in "P" position, check brakelight switch 4-pin connector C1 for damaged or loose terminals. Repair as necessary, then go to step 3. If connector and terminals are okay, replace brakelight switch, then go to step 3.
  2. Disconnect BTSI solenoid connector. Using a test light, jumper between shift interlock connector terminal "A" and ground. (Scheme 25) If test light illuminates, repair short to battery in circuit between BTSI solenoid connector terminal "A" and brakelight switch 4-pin connector C1 terminal"B", then go to next step. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system). If test light does not illuminate, check BTSI solenoid connector for damaged or loose terminals. If connector and terminals are okay, replace BTSI solenoid, then go to next step.
  3. Ensure all components disconnected or removed during testing are reconnected and installed on vehicle. Ensure BTSI system operates correctly. See «SHIFT INTERLOCK SOLENOID»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system__shift-interlock-solenoid) under DESCRIPTION & OPERATION. If system does not operate correctly, repeat step 1.
  1. Turn ignition switch to ON position. Place gearshift lever in "P" position. Disconnect brakelight switch 4-pin connector C1. Apply brake pedal and hold. Move gearshift lever out of "P" position. If gearshift lever is locked in "P" position, go to next step. If gearshift lever is not locked in "P" position, check brakelight switch 4-pin connector C1 for damaged or loose terminals. If connector and terminals are okay, replace brakelight switch, then go to step 3.
  2. Disconnect BTSI solenoid connector. Measure voltage between brakelight switch 4-pin connector C1 terminal "A" and ground. (Scheme 25) If voltage is more than.5 volt, repair short to battery in circuit between brakelight switch 4-pin connector C1 terminal "B" and BTSI solenoid terminal "A", then go to next step. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system). If voltage is.5 volt or less, replace BTSI solenoid, then go to next step.
  3. Ensure all components disconnected or removed during testing are reconnected and installed on vehicle. Ensure BTSI system operates correctly. See «SHIFT INTERLOCK SOLENOID»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system__shift-interlock-solenoid) under DESCRIPTION & OPERATION. If system does not operate correctly, repeat step 1.

Note. Before performing the following test, check ERLS fuse (10-amp) located in dash fuse block. A short to ground in a circuit can cause an open fuse.

  1. Disconnect BTSI solenoid connector. Turn ignition switch to ON position. Measure voltage between BTSI solenoid connector terminal "B" and ground. (Scheme 25) If battery voltage is present, go to next step. If battery voltage is not present, go to step 3.
  2. Measure resistance between BTSI solenoid connector terminal "A" and ground. (Scheme 25) If resistance is 0-2 ohms, replace BTSI solenoid, then go to step 5. If resistance is not 0-2 ohms, repair open circuit between BTSI solenoid connector terminal "A" and ground (G202) located at left side of dash, then go to step 5. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system).
  3. Measure voltage by backprobing between brakelight switch 4-pin connector C2 terminal "B" and ground. (Scheme 24) If battery voltage is not present, go to next step. If battery voltage is present, repair open circuit between brakelight switch 4-pin connector C2 terminal "B" and BTSI solenoid connector terminal "B", then go to step 5. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system).
  4. Measure voltage between brakelight switch 4-pin connector C2 terminal "A" and ground. (Scheme 24) If battery voltage is present, check brakelight switch adjustment. If adjustment is okay, replace brakelight switch, then go to next step. If battery voltage is not present, check for open circuit between ERLS fuse and brakelight switch 4-pin connector C2 terminal "A", then go to next step. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system).
  5. Ensure all components disconnected or removed during testing are reconnected and installed on vehicle. Ensure BTSI system operates correctly. See «SHIFT INTERLOCK SOLENOID»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system__shift-interlock-solenoid) under DESCRIPTION & OPERATION. If system does not operate correctly, repeat step 1.

"K" Body (Seville Only)

Note. For DeVille models, see "E" & "K" BODY (EXCEPT SEVILLE) .

  1. Turn ignition switch to OFF position. Move gearshift lever out of "P" position. If gearshift lever is not locked in "P" position, go to next step. If gearshift lever is locked in "P" position, go to step 3.
  2. Turn ignition switch to ON position. Apply brake pedal. Move gearshift lever out of "P" position. If gearshift lever is locked in "P" position, go to next step. If gearshift lever is not locked in "P" position, system is operating correctly. Check for intermittent fault.
  3. Turn ignition switch to OF position. Disconnect brakelight switch 4-pin connector C2. Turn ignition switch to ON position. Move gearshift lever out of "P" position. If gearshift lever is not locked in "P" position, go to next step. If gearshift lever is locked in "P" position, check brakelight switch for correct adjustment, and for damaged or loose terminals. Repair as necessary, then go to step 6. If adjustment is correct and connector and terminals are okay, replace brakelight switch, then go to step 6.
  4. Turn ignition switch to OFF position. Disconnect BTSI solenoid connector. Turn ignition switch to ON position. Using test light, jumper between BTSI solenoid terminal "A" and ground. (Scheme 25) If test light illuminates, go to next step. If test light does not illuminate, check BTSI solenoid for damaged or loose terminals. Repair as necessary, then go to step 6. If BTSI solenoid connector and terminals are okay, replace BTSI solenoid, then go to step 6.
  5. Check for short to battery power in circuit between brakelight switch 4-pin connector C2 terminal "B" and BTSI solenoid connector terminal "A". (Scheme 24)and (Scheme 25). See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system). Repair as necessary, then go to step.
  6. Ensure all components disconnected or removed during testing are reconnected and installed on vehicle. Ensure BTSI system operates correctly. See «SHIFT INTERLOCK SOLENOID»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system__shift-interlock-solenoid) under DESCRIPTION & OPERATION. If system does not operate correctly, repeat step 1.

Note. Before performing this test, check BULMP/BTSI fuse (15-amp) located in underhood junction block. A short to ground in a circuit can cause an open fuse.

  1. Turn ignition switch to ON position. Apply brake pedal. Move gearshift lever out of "P" position. If gearshift lever is locked in "P" position, go to next step. If gearshift lever is not locked in "P" position, system is operating correctly. Check for intermittent fault.
  2. Disconnect brakelight switch 4-pin connector C2. Move gearshift lever out of "P" position. If gearshift lever is locked in "P" position, go to next step. If gearshift lever is not locked in "P" position, replace brakelight switch, then go to step 4.
  3. Check for a short to battery power in circuit between brakelight switch 4-pin connector terminal "B" and BTSI solenoid connector terminal "A". (Scheme 24)and (Scheme 25). See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system). Repair as necessary, then go to next step. If circuit is okay, check BTSI solenoid or related linkage for mechanical binding. Repair as necessary, then go to next step. If linkage and BTSI solenoid are okay, replace BTSI solenoid, then go to next step.
  4. Ensure all components disconnected or removed during testing are reconnected and installed on vehicle. Ensure BTSI system operates correctly. See «SHIFT INTERLOCK SOLENOID»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system__shift-interlock-solenoid) under DESCRIPTION & OPERATION. If system does not operate correctly, repeat step 1.

Note. Before performing the following test, check NSBU fuse (10-amp) located in underhood junction block. A short to ground in a circuit can cause an open fuse.

  1. Turn ignition switch to ON position. Apply brake pedal. Move gearshift lever out of "P" position. If gearshift lever is locked in "P" position, go to next step. If gearshift lever is not locked in "P" position, system is operating correctly. Check for intermittent fault.
  2. Disconnect brakelight switch 4-pin connector C2. Move gearshift lever out of "P" position. If gearshift lever is locked in "P" position, go to next step. If gearshift lever is not locked in "P" position, replace brakelight switch, then go to step 4.
  3. Check for a short to battery power in circuit between brakelight switch 4-pin connector terminal "B" and BTSI solenoid connector terminal "A". (Scheme 24)and (Scheme 25). See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system). Repair as necessary, then go to next step. If circuit is okay, check BTSI solenoid or related linkage for mechanical binding. Repair as necessary, then go to next step. If linkage and BTSI solenoid are okay, replace BTSI solenoid, then go to next step.
  4. Ensure all components disconnected or removed during testing are reconnected and installed on vehicle. Ensure BTSI system operates correctly. See «SHIFT INTERLOCK SOLENOID»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system__shift-interlock-solenoid) under DESCRIPTION & OPERATION. If system does not operate correctly, repeat step 1.
  1. Disconnect shift lock control module 5-pin connector. Turn ignition switch to ON position. Measure voltage between shift lock control module connector terminal No. 5 and ground. (Scheme 32) If voltage is 10-14 volts, go to next step. If voltage is not 10-14 volts, repair open in IGNITION circuit between shift control module connector terminal No. 5 and ECU-IG fuse (10-amp) located in junction block No. 2 on left side of instrument panel behind storage box cover, then go to step 5. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system).
  2. Measure voltage between shift lock control module connector terminal No. 1 and ground. (Scheme 32) If voltage is 10-14 volts, go to next step. If voltage is not 10-14 volts, repair open in IGNITION circuit between shift control module connector terminal No. 1 and CIG fuse (15-amp) located in junction block No. 2 on left side of instrument panel behind storage box cover, then go to step 5. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system).
  3. Measure resistance between shift lock control module connector terminal No. 3 and ground. (Scheme 32) If resistance is less than 2 ohms, go to next step. If resistance is 2 ohms or more, repair open in GROUND circuit between shift lock control module connector terminal No. 3 and terminal No. 20 of Gray connector C2 located in junction block No. 3 behind center of instrument panel, then go to step 5. (Scheme 33) See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system).
  4. Measure voltage between shift lock control module connector terminal No. 2 and ground while applying brake pedal. (Scheme 32) If voltage is 10-14 volts, replace shift control module, then go to next step. If voltage is not 10-14 volts, repair open in BRAKE SIGNAL circuit between shift control module connector terminal No. 2 and terminal No. 21 of Gray connector C2 located in junction block No. 3 behind center of instrument panel, then go to next step. (Scheme 33) See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system).
  5. Ensure all components disconnected or removed during testing are reconnected and installed on vehicle. Ensure BTSI system operates correctly. See «SHIFT INTERLOCK SOLENOID»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system__shift-interlock-solenoid) under DESCRIPTION & OPERATION. If system does not operate correctly, repeat step 1.

Note. Before performing the following test, check for mechanical binding or foreign material that may be preventing BTSI solenoid from operating correctly.

  1. Disconnect in-line 9-pin connector C205. Turn ignition switch to ON position. Measure voltage between female side of in-line connector C205 terminal No. 8 and ground. (Scheme 34) If battery voltage is not present, go to next step. If battery voltage is present, check operation of automatic transmission shift lock control solenoid and inspect it for damage. If solenoid is damaged or does not operate correctly, replace solenoid, then go to step 5.
  2. Turn ignition switch to OFF position. Disconnect brakelight switch 4-pin connector C2. Measure voltage between female side of in-line connector C205 terminal No. 8 and ground. (Scheme 34) If battery voltage is present, go to next step. If battery voltage is not present, replace brakelight switch, then go to step 5.
  3. Disconnect Body Control Module (BCM) 32-pin Brown connector C2. Measure voltage between female side of in-line connector C205 terminal No. 8 and ground. (Scheme 34) If battery voltage is present, go to next step. If battery voltage is not present, replace BCM, then go to step 5.
  4. Check for short to battery in circuits between in-line connector C205 terminal No. 8, brakelight switch 4-pin connector terminal No. 4 or BCM Brown connector C2 terminal "D11". (Scheme 34)- (Scheme 36). Repair as necessary, then go to next step. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system).
  5. Ensure all components disconnected or removed during testing are reconnected and installed on vehicle. Ensure BTSI system operates correctly. See «SHIFT INTERLOCK SOLENOID»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system__shift-interlock-solenoid) under DESCRIPTION & OPERATION. If system does not operate correctly, repeat step 1.
WARNINGDeactivate air bag system before performing any service operation involving steering column components. See appropriate AIR BAG RESTRAINT SYSTEMS article in ACCESSORIES & EQUIPMENT. Do not apply electrical power to any component on steering column without first deactivating air bag system. Air bag may deploy.

Note. Before performing the following test, check BTSI PARK LOCK fuse (10-amp). A short to battery power in BTSI solenoid power circuit can create a higher load and an open fuse.

  1. Turn ignition switch to ON position. Ensure gearshift lever is in "P" position. Using a test light, backprobe between brakelight switch 4-pin connector terminal "A" and ground. (Scheme 24) If test light does not illuminate, go to next step. If test light illuminates, go to step 3.
  2. Check for open or poor connections between BTSI PARK LOCK fuse (10-amp) and brakelight switch 4-pin connector C2 terminal "A", or between BTSI PARK LOCK fuse (10-amp) and ignition switch. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system). Repair as necessary, then go to step 8.
  3. Using test light, backprobe between brakelight switch 4-pin connector C2 terminal "B" and ground. (Scheme 26) DO NOT apply brake pedal. If test light illuminates, go to next step. If test light does not illuminate, replace brakelight switch, then go to step 8.
  4. Turn ignition switch to LOCK position. Disconnect BTSI solenoid connector. Using test light, jumper between BTSI solenoid connector terminal "A" and ground. If test light illuminates, go to next step. If test light does not illuminate, check for open circuit or poor connections between brakelight switch 4-pin connector C2 terminal "B" and BTSI connector terminal "A". See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system). Repair as necessary, then go to step 8.
  5. Using test light, jumper between BTSI solenoid connector terminal "A" and "B". (Scheme 26) If test light does not illuminate, go to next step. If test light illuminates, replace BTSI solenoid, then go to step 8.
  6. Disconnect Transmission Range (TR) switch 7-pin connector. Using test light, jumper between TR switch connector terminal "D" and battery power. (Scheme 28) If test light does not illuminate, repair open circuit or poor connections between TR sensor terminal "D" and ground (G129) located on transaxle stud. If test light illuminates, go to next step. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system).
  7. Check for open circuit or poor connections between BTSI solenoid connector terminal "B" and TR switch 7-pin connector terminal "A". Repair as necessary, then go to next step. If circuit and connections are okay, replace TR switch, then go to next step. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system).
  8. Ensure all components disconnected or removed during testing are reconnected and installed on vehicle. Ensure BTSI system operates correctly. See «SHIFT INTERLOCK SOLENOID»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system__shift-interlock-solenoid) under DESCRIPTION & OPERATION. If system does not operate correctly, repeat step 1.
  1. Disconnect BTSI solenoid connector. Turn ignition switch to ON position. Ensure gearshift lever is in "P" position. Using a test light, jumper between BTSI solenoid connector terminal "A" and ground. (Scheme 26) Apply brake pedal. If test light does not illuminate, replace BTSI solenoid, then go to step 3. If test light illuminates, go to next step.
  2. Disconnect brakelight switch 4-pin connector C2. Connect test light between brakelight switch 4-pin connector C2 terminal "B" and ground. (Scheme 24) If test light illuminates, repair short to battery power in circuit between BTSI solenoid connector terminal "A" and brakelight switch 4-pin connector C2 terminal "B", then go to next step. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system). If test light does not illuminate, replace brakelight switch, then go to next step.
  3. Ensure all components disconnected or removed during testing are reconnected and installed on vehicle. Ensure BTSI system operates correctly. See «SHIFT INTERLOCK SOLENOID»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system__shift-interlock-solenoid) under DESCRIPTION & OPERATION. If system does not operate correctly, repeat step 1.
  1. Disconnect automatic transaxle control 6-pin connector. Turn ignition switch to ON position. Ensure gearshift lever is in "P" position. Using a test light, jumper between automatic transaxle control connector terminal "E" and ground. (Scheme 38) Apply brake pedal. If test light does not illuminate, replace BTSI solenoid, then go to step 3. If test light illuminates, go to next step.
  2. Disconnect brakelight switch 4-pin connector C2. Connect test light between brakelight switch 4-pin connector C2 terminal "B" and ground. (Scheme 24) If test light illuminates, repair short to battery power in circuit between automatic transaxle control connector terminal "E" and brakelight switch 4-pin connector C2 terminal "B", then go to next step. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system). If test light does not illuminate, replace brakelight switch, then go to next step.
  3. Ensure all components disconnected or removed during testing are reconnected and installed on vehicle. Ensure BTSI system operates correctly. See «SHIFT INTERLOCK SOLENOID»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system__shift-interlock-solenoid) under DESCRIPTION & OPERATION. If system does not operate correctly, repeat step 1.
  1. Place gearshift lever in "P" position. Check BTSI fuse (10-amp) for an open. If fuse is blown, go to next step If fuse is okay, go to step 5.
  2. Disconnect BTSI solenoid connector. Using test light, backprobe between BTSI fuse (10-amp) terminal C4 and battery power. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system). If test light illuminates, go to next step. If test light does not illuminate, replace BTSI fuse (10-amp), reconnect BTSI solenoid, then go to step 15.
  3. Disconnect brakelight switch 4-pin connector C2. Using test light, backprobe between BTSI fuse (10-amp) terminal "C4" and battery power. If test light does not illuminate, go to next step. If test light illuminates, check for short to ground in circuit between brakelight switch 4-pin connector C2 terminal "A" and BTSI fuse (10-amp) terminal "C4". (Scheme 24) See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system). Repair as necessary, then go to step 15.
  4. Check for short to ground in circuit between brakelight switch 4-pin connector C2 terminal "B" and BTSI solenoid connector terminal "A". (Scheme 24)and (Scheme 25). See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system). Repair as necessary, then go to step 15.
  5. Turn ignition switch to ON position. Using test light, backprobe between brakelight switch 4-pin connector C2 terminal "A" and ground. If test light does not illuminate, go to next step. If test light illuminates, go to step 8.
  6. Using test light, backprobe between BTSI fuse (10-amp) terminal "C3" and ground. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system). If test light illuminates, check for poor connection or open circuit between brakelight switch 4-pin connector C2 terminal "A" and BTSI fuse (10-amp) terminal "C4". Repair as necessary, then go to step 15. (Scheme 24) See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system). If test light does not illuminate, go to next step.
  7. Check for poor connection or open circuit between ignition switch connector C2 terminal "B" and BTSI fuse (10-amp) terminal "C3". (Scheme 39) Repair as necessary, then go to step 15. (Scheme 24) See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system).
  8. Disconnect brakelight switch 4-pin connector C2. Using test light, backprobe between brakelight switch 4-pin connector C2 terminal "B" and ground. (Scheme 24) If test light illuminates, go to next step. If test light does not illuminate, check brakelight switch adjustment. Adjust as necessary, then go to step 15. If brakelight switch is adjusted correctly, replace brakelight switch, then go to step 15.
  9. Turn ignition switch to OFF position. Disconnect BTSI solenoid connector. Turn ignition switch to ON position. Using test light, backprobe between BTSI solenoid connector terminal "A" and ground. If test light illuminates, go to next step. If test light does not illuminate, repair open circuit between BTSI solenoid connector terminal "A" and brakelight switch 4-pin connector C2 terminal "B", then go to step 15. (Scheme 24)and (Scheme 25). See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system).
  10. Using test light, backprobe between BTSI solenoid connector terminal "A" and "B". If test light does not illuminate, go to next step. If test light illuminates, check BTSI solenoid linkage for mechanical damage. Repair as necessary, then go to step 15. If BTSI solenoid linkage is okay, replace BTSI solenoid, then go to step 15.
  11. Turn ignition switch to OFF position. Reconnect BTSI solenoid connector. Using test light, backprobe between underhood junction block 68-pin connector C1 terminal "A12" and battery power. (Scheme 31) If test light illuminates, go to next step. If test light does not illuminate, go to step 13.
  12. Using test light, backprobe between underhood junction block 68-pin connector C2 terminal "C11" and battery power. (Scheme 31) If test light does not illuminate, replace underhood junction block, then go to step 15. If test light illuminates, repair open circuit or poor connection between underhood junction block 68-pin connector C2 terminal "C11" and BTSI solenoid connector terminal "B", then go to step 15. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system).
  13. Using test light, backprobe between TR switch connector C1 terminal "A" and battery power. (Scheme 28) If test light does not illuminate, go to next step. If test light illuminates, repair open circuit or poor connection between TR switch connector C1 terminal "A" and underhood junction block connector C1 terminal "A12", then go to step 15. (Scheme 31) See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system).
  14. Using test light, backprobe between TR switch connector C1 terminal "D" and battery power. (Scheme 28) If test light illuminates, check TR switch adjustment. Adjust TR switch as necessary, then go to next step. If TR switch adjustment is correct, replace TR switch, then go to next step. If test light does not illuminate, repair open circuit or poor connection between TR switch connector C1 terminal "D" and ground (G129) located on transaxle stud, then go to step 15. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system).
  15. Ensure all components disconnected or removed during testing are reconnected and installed on vehicle. Ensure BTSI system operates correctly. See «SHIFT INTERLOCK SOLENOID»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system__shift-interlock-solenoid) under DESCRIPTION & OPERATION. If system does not operate correctly, repeat step 1.
  1. Place gearshift lever in "P" position. Check fuse No. 39 (10-amp) in Instrument Panel (I/P) fuse block located on right side of I/P in door opening. If fuse No. 39 (10-amp) is okay, go to step 5. If fuse is blown, go to next step.
  2. Disconnect BTSI solenoid connector. Using test light, backprobe between fuse No. 39 (10-amp) terminal "C2" and battery power. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system). If test light illuminates, go to next step. If test light does not illuminate, replace fuse No. 39 (10-amp), reconnect BTSI solenoid connector and go to step 12.
  3. Using test light, backprobe between fuse No. 39 (10-amp) terminal "C2" and battery power. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system). Disconnect brakelight switch 4-pin connector C2. If test light illuminates, repair short to ground in circuit between fuse No. 39 terminal "C2" and brakelight switch 4-pin connector C2 terminal "A", then go to step 12. (Scheme 24) If test light does not illuminate, go to next step.
  4. Check for short to ground in circuit between brakelight switch 4-pin connector C2 terminal "B" and BTSI solenoid connector terminal "A". (Scheme 24)and (Scheme 25). See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system). Repair as necessary, then go to step 12.
  5. Turn ignition switch to ON position. Using test light, backprobe between brakelight switch 4-pin connector C2 terminal "A" and ground. If test light does not illuminate, go to next step. If test light illuminates, go to step 8.
  6. Using test light, backprobe between fuse No. 39 terminal "C1" and ground. If test light illuminates, repair open circuit or poor connection between brakelight switch 4-pin connector C2 terminal "A" and fuse No. 39 (10-amp) terminal "C2", then go to step 12. If test light does not illuminate, go to next step.
  7. Check for open or poor connection in circuit between fuse No. 39 (10-amp) terminal "C1" and ignition switch 48-pin connector C201 terminal "D6". (Scheme 40) See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system). Repair as necessary, then go to step 12.
  8. Using test light, backprobe between brakelight switch 4-pin connector C2 terminal "B" and ground. If test light illuminates, go to next step. If test light does not illuminate, check brakelight switch adjustment. Adjust as necessary, then go to step 12. If adjustment is okay, replace brakelight switch, then go to step 12.
  9. Turn ignition switch to OFF position. Disconnect BTSI solenoid connector. Turn ignition switch to ON position. Using test light, backprobe between BTSI solenoid connector terminal "A" and ground. (Scheme 25) If test light illuminates, go to next step. If test light does not illuminate, repair open or poor connection in circuit between brakelight switch 4-pin connector C2 terminal "B" and BTSI solenoid connector terminal "A". See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system). Repair as necessary, then go to step 12.
  10. Ensure ignition switch is turned to ON position. Using test light, backprobe between BTSI solenoid connector terminals "A" and "B". (Scheme 25) If test light does not illuminate, go to next step. If test light illuminates, check BTSI solenoid linkage for mechanical damage. Repair as necessary, then go to step 15. If BTSI solenoid linkage is okay, replace BTSI solenoid, then go to step 15.
  11. Check for open or poor connection in circuit between BTSI solenoid connector terminal "B" and ground (G202) located behind dash, on left side of brake pedal bracket. (Scheme 25) See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system). Repair as necessary, then go to next step.
  12. Ensure all components disconnected or removed during testing are reconnected and installed on vehicle. Ensure BTSI system operates correctly. See «SHIFT INTERLOCK SOLENOID»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system__shift-interlock-solenoid) under DESCRIPTION & OPERATION. If system does not operate correctly, repeat step 1.

Note. Before performing the following test, ensure BTSI PARK LOCK fuse (10-amp) is okay. A short to ground in a circuit can cause an open fuse.

  1. Turn ignition switch to ON position. Ensure gearshift lever is in "P" position. Using a test light, backprobe between brakelight switch 4-pin connector terminal "A" and ground. (Scheme 24) If test light does not illuminate, go to next step. If test light illuminates, go to step 3.
  2. Check for open or poor connections between BTSI PARK LOCK fuse (10-amp) and brakelight switch 4-pin connector C2 terminal "A", or between BTSI PARK LOCK fuse (10-amp) and ignition switch. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system). Repair as necessary, then go to step 8.
  3. Using test light, backprobe between brakelight switch 4-pin connector C2 terminal "B" and ground. (Scheme 26) DO NOT apply brake pedal. If test light illuminates, go to next step. If test light does not illuminate, replace brakelight switch, then go to step 8.
  4. Turn ignition switch to LOCK position. Disconnect BTSI solenoid connector. Using test light, jumper between BTSI solenoid connector terminal "E" and ground. (Scheme 38) If test light illuminates, go to next step. If test light does not illuminate, check for open circuit or poor connections between brakelight switch 4-pin connector C2 terminal "B" and BTSI connector terminal "E". See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system). Repair as necessary, then go to step 8.
  5. Using test light, jumper between BTSI solenoid connector terminal "A" and "E". (Scheme 38) If test light does not illuminate, go to next step. If test light illuminates, replace BTSI solenoid, then go to step 8.
  6. Disconnect Transmission Range (TR) switch 7-pin connector. Using test light, jumper between TR switch connector terminal "D" and battery power. (Scheme 28) If test light does not illuminate, repair open circuit or poor connections between TR sensor terminal "D" and ground (G129) located on transaxle stud, then go to step 8. If test light illuminates, go to next step. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system).
  7. Check for open circuit or poor connections between BTSI solenoid connector terminal "A" and TR switch 7-pin connector terminal "A". (Scheme 28)and (Scheme 38). See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system). Repair as necessary, then go to next step. If circuit and connections are okay, replace TR switch, then go to next step.
  8. Ensure all components disconnected or removed during testing are reconnected and installed on vehicle. Ensure BTSI system operates correctly. See «SHIFT INTERLOCK SOLENOID»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system__shift-interlock-solenoid) under DESCRIPTION & OPERATION. If system does not operate correctly, repeat step 1.
  1. Disconnect brakelight switch 4-pin connector C2 and BTSI solenoid 4-pin connector. Turn ignition switch to ON position. Measure voltage between brakelight switch 4-pin connector C2 terminal "B" and ground. (Scheme 24) If voltage is not 10-14 volts, go to next step. If voltage is 10-14 volts, check for short to battery power in circuit between brakelight switch 4-pin connector C2 terminal "B" and BTSI solenoid 4-pin connector terminal "C". (Scheme 41) See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system). Repair as necessary, then go to step 3.
  2. Turn ignition switch to OFF position. Reconnect brakelight switch 4-pin connector C2. Apply brake pedal and measure voltage between BTSI solenoid 4-pin connector terminal "C" and ground. (Scheme 41) If voltage is 10-14 volts, replace brakelight switch, then go to next step. If voltage is not 10-14 volts, replace BTSI solenoid, then go to next step.
  3. Ensure all components disconnected or removed during testing are reconnected and installed on vehicle. Ensure BTSI system operates correctly. See «SHIFT INTERLOCK SOLENOID»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system__shift-interlock-solenoid) under DESCRIPTION & OPERATION. If system does not operate correctly, repeat step 1.
  1. Check operation of BRAKE TO SHIFT indicator. If BRAKE TO SHIFT indicator is inoperative, go to next step. If BRAKE TO SHIFT indicator remains on when brake pedal is depressed, go to step 7.
  2. Turn ignition switch to ON position. Disconnect Body Control Module (BCM) 32-pin connector C2. Connect a fused jumper between BCM connector C2 terminal "C15" and ground. (Scheme 36) If BRAKE TO SHIFT indicator illuminates, go to next step. If BRAKE TO SHIFT indicator does not illuminate, go to step 4.
  3. Ensure gearshift lever is in "P" position. Disconnect BCM 24-pin connector C1. Check continuity between BCM connector C1 terminal "B1" and ground. (Scheme 36) If there is no continuity, go to step 5. If there is continuity, check for short to ground in circuit between BCM connector C1 terminal "B1" and automatic transmission shift lock control switch. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system). Repair as necessary, then go to step 10. If circuit is okay, replace automatic transmission shift lock control switch, then go to step 10.
  4. Remove fused jumper and replace BRAKE TO SHIFT indicator bulb. Reconnect fused jumper between BCM connector C2 terminal "C15" and ground. (Scheme 36) If indicator still does not illuminate, repair open circuit or high resistance in BRAKE TO SHIFT INDICATOR circuit between BCM connector C2 terminal "C15" and BRAKE TO SHIFT indicator. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system). Repair as necessary, then go to step 10. If circuit is okay, replace instrument cluster, then go to step 10.
  5. Measure voltage between BCM connector C2 terminal "D11" and ground. (Scheme 36) If no voltage is present, replace BCM, then go to step 10. If any voltage is present, go to next step.
  6. Check for short to battery in circuit between BCM connector C2 terminal "D11", brakelight switch and automatic transmission shift lock control solenoid. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system). Repair as necessary, then go to step 10. If circuit is okay, replace brakelight switch, then go to step 10.
  7. Turn ignition switch to ON position. Disconnect BCM 32-pin Brown connector C2. If BRAKE TO SHIFT indicator does not stay illuminated, go to next step. If BRAKE TO SHIFT indicator stays illuminated, check for short to ground in BRAKE TO SHIFT circuit between BCM connector C2 terminal "C15" and BRAKE TO SHIFT indicator. (Scheme 36) See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system). Repair as necessary, then go to step 10.
  8. Measure voltage between BCM connector C2 terminal "D11" and ground while applying brake pedal. (Scheme 36) If battery voltage is present, go to next step. If battery voltage is not present, check for an open or high resistance in STOPLAMP SWITCH circuit between BCM connector C2 terminal "D11" and splice S217 located in instrument panel harness near multifunction relay connector branch off. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system). Repair as necessary, then go to step 10.
  9. Reconnect all connectors. Move gearshift lever out of "P" position. Operate power door locks. If power door locks operate correctly, replace BCM, then go to next step. If power door locks do not operate correctly, see appropriate wiring diagram in POWER DOOR LOCKS & REMOTE KEYLESS ENTRY SYSTEMS article in ACCESSORIES & EQUIPMENT.
  10. Ensure all components disconnected or removed during testing are reconnected and installed on vehicle. Ensure BTSI system operates correctly. See «SHIFT INTERLOCK SOLENOID»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system__shift-interlock-solenoid) under DESCRIPTION & OPERATION. If system does not operate correctly, repeat step 1.
  1. Remove ignition switch and ignition lock cylinder. Check ignition switch, lock cylinder and steering column for damage or mechanical faults. If ignition switch, lock cylinder and steering column are okay, go to next step. If ignition switch, lock cylinder or steering column are damaged, repair or replace component as necessary, then go to step 6.
  2. Reinstall ignition switch and lock cylinder. Disconnect lifting magnet 7-pin connector. Turn ignition switch to ON position. Measure voltage between lifting magnet connector terminal No. 1 and ground. (Scheme 37) If battery voltage is present, go to next step. If battery voltage is not present, check CLAMP W PBSL FUSE No. 24 (10-amp) located in fuse block left of steering column. If fuse is okay go to step 4. If fuse is blown, go to step 5.
  3. Measure resistance between lifting magnet connector terminal No. 2 and ground. (Scheme 37) If resistance is less than 5 ohms, replace automatic transmission lock/unlock switch, then go to step 6. If resistance is 5 ohms or more, replace lifting magnet assembly, then go to step 6.
  4. Check for an open or high resistance in circuit between lifting magnet connector terminal No. 1 and CLAMP W PBSL FUSE No. 24. Repair as necessary, then go to step 6. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system). If circuit is okay, replace ignition switch, then go to step 6.
  5. Check for short to ground in circuit between lifting magnet connector terminal No. 1 and CLAMP W PBSL FUSE No. 24. Repair as necessary, then go to next step. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system). If circuit is okay, replace ignition switch, then go to next step.
  6. Ensure all components disconnected or removed during testing are reconnected and installed on vehicle. Ensure ignition key can be removed. Reinstall ignition key and ensure operation of ignition switch is correct. If ignition key still cannot be removed, repeat step 1.

"W" Body (Grand Prix & Regal)

  1. If ignition switch can be turned to LOCK position with gearshift lever out of "P" position, go to next step. If ignition switch cannot be turned to LOCK position, with gearshift lever in "P" position, go to step 4.
  2. Move gearshift lever to "P" position. Turn ignition switch to OFF position. Using a test light, backprobe between automatic transaxle control 6-pin connector terminal "C" and ground. (Scheme 38) If test light illuminates, go to next step. If test light does not illuminate, replace steering column electric park lock assembly, then go to step 9.
  3. Disconnect automatic transaxle control 6-pin connector. Connect test light between automatic transaxle control connector terminal "C" and ground. (Scheme 38) If test light does not illuminate, replace automatic transaxle control assembly, then go to step 9. If test light illuminates, repair short to battery power in circuit between automatic transaxle control connector terminal "C" and steering column electric park lock connector terminal "A", then go to step 9. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system).
  4. On Regal, check BTSI PARK LOCK fuse (10-amp) for open circuit. On Grand Prix, check BTSI fuse (10-amp) for open circuit. If appropriate fuse is okay, go to next step. If fuse is blown, check for short to ground in circuit between fuse and steering column electric park lock assembly. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system). Repair as necessary, replace fuse, then go to step 9.
  5. Ensure gearshift lever is in "P" position and ignition switch is in ON position. Using a test light, backprobe between automatic transaxle control connector terminal "F" and ground. (Scheme 38) If test light illuminates, go to next step. If test light does not illuminate, repair poor connection or open circuit between automatic transaxle control connector terminal "F" and BTSI PARK LOCK fuse on Regal, or BTSI fuse on Grand Prix, then go to step 9. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system).
  6. Using test light, backprobe between automatic transaxle control connector terminal "C" and ground. (Scheme 38) If test light illuminates, go to next step. If test light does not illuminate, replace automatic transaxle control assembly, then go to step 9.
  7. Using test light, backprobe between steering column electric park lock connector terminal "A" and ground. (Scheme 26) If test light illuminates, go to next step. If test light does not illuminate, repair poor connection or open circuit between steering column electric park lock connector terminal "A" and automatic transaxle control connector terminal"C". See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system). Repair as necessary, then go to step 9.
  8. Using test light, backprobe between steering column electric park lock connector terminal "A" and "B". (Scheme 26) If test light illuminates, replace steering column electric park lock assembly, then go to next step. If test light does not illuminate, repair poor connection or open circuit between steering column electric park lock connector terminal "B" and ground (G201). On Regal, G201 is located behind right side of glove box, on Grand Prix, G201 is located behind fuse block on right side of dash. Repair as necessary, then go to next step. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/automatic-trans/#shift-interlock-system).
  9. Ensure all components disconnected or removed during testing are reconnected and installed on vehicle. Ensure ignition key can be removed. Reinstall ignition key and ensure operation of ignition switch is correct. If ignition key still cannot be removed, repeat step 1.

ADJUSTMENTS

WARNINGWhen battery is disconnected, vehicle computer and memory systems may lose memory data. Driveability problems may exist until computer systems have completed a relearn cycle. Before disconnecting battery, see COMPUTER RELEARN PROCEDURES article in APPLICATIONS & IDENTIFICATION.

Note. On Grand Prix and Regal ("W" body), a park lock solenoid is used and is located in steering column. For park lock diagnostics, see STEERING COLUMN LOCK MALFUNCTION - "W" BODY (GRAND PRIX & REGAL) in SYMPTOM TESTS.

Note. "S" and "V" body vehicles are not equipped with a park lock cable. They are only equipped with a Brake Transmission/Transaxle Shift Interlock (BTSI) system. Information for "N" and "Y" body vehicles is not available for park lock cable adjustment.

  1. Remove console, left-side sound insulator and knee bolster as necessary. Ensure ignition switch is in LOCK position. Place park lock cable adjuster button in up (unlocked) position. Grasp cable at front of spring and move forward in vehicle to remove slack. Release cable.
  2. Move cable adjuster rearward in vehicle 1/16" from previous position. While holding cable in this position, push adjuster button down flush with adjuster body. Check park lock cable operation.

"C", "F", "G", "H" & "W" Body (Except Intrigue)

  1. With gearshift lever in "P" position and ignition switch in LOCK position, gearshift lever should not be allowed movement to other gear positions and ignition key should be removable from lock cylinder.
  2. With ignition switch turned to ON position and gearshift lever in "N" position, ensure ignition switch cannot be turned to LOCK position. If system does not operate as specified, unlock park lock cable adjuster (button up). (Scheme 42) Move cable connector nose forward to remove slack, then lock park lock cable adjuster (button down). Recheck operation.
  3. If key cannot be removed in "P" position, then unlock park lock cable adjuster (button up) and move cable connector nose rearward until key can be removed from ignition switch. Lock cable adjuster (button down) and recheck operation.

Scheme 42

Scheme 42
Scheme 42

"J" Body

  1. With ignition switch turned to ON position and gearshift lever in Neutral, ensure ignition switch cannot be turned to LOCK position.
  2. With gearshift lever in "P" position and ignition switch in LOCK position, gearshift lever should not be allowed movement to other gear positions and ignition key should be removable from lock cylinder.
  3. If system does not perform as described, place gearshift lever in "P" position and dislodge park lock cable housing lock at ignition switch. Adjust outer cable housing to position Blue plastic collar in park lock housing. (Scheme 43)
  4. Ensure no gap is present between metal terminal stop at end of cable and Blue plastic collar. Blue plastic collar should be flush or less than.04" (1.0 mm) recessed in park lock housing. Hold cable in position and seat park lock cable housing lock. Check park lock cable operation.

Scheme 43

Scheme 43
Scheme 43

Scheme 44

Scheme 44: "A" & "M" Body
Scheme 44: "A" & "M" Body
  1. Remove 6 screws retaining center console. Remove center console and rear console. Remove manual selector cover if necessary. Loosen, but DO NOT remove park lock cable bolt. (Scheme 44) Ensure gearshift lever is in "P" position. While holding selector button in, rotate key release plate and insert a small screwdriver through key release plate to hold plate in position. (Scheme 44)
  2. Allow retaining spring to position park lock cable into correct position in bracket. Tighten park lock cable bolt to 115 INCH lbs. (13 N.m). Recheck operation prior to center console reassembly. Ensure key cannot be removed from ignition switch when gearshift lever is in any position except "P" position, and that gearshift lever cannot be moved from "P" position with ignition switch in LOCK position.

Scheme 45

Scheme 45: "W" Body (Intrigue Only)
Scheme 45: "W" Body (Intrigue Only)
  1. Set parking brake and block wheels. Turn ignition switch to ACC position. Ensure gearshift lever is in "P" position. Open console storage lid and open cup holder to remove front floor console trim panel. Remove center console trim panel. (Scheme 45)
  2. Disconnect park lock cable from console shift control. Open lock on adjuster body by prying up with a flat-bladed screwdriver. (Scheme 45) Move adjuster body so that one more rib is visible on cable, then depress lock on adjuster body. Connect park lock cable to console shift control. Ensure park lock system operates correctly.
  3. Ensure ignition switch can be moved to LOCK position when gearshift lever is in "P" position only and gearshift lever can only be moved out of "P" position when ignition switch in ACC or ON position. If operation is not correct, repeat step 2. If operation is correct, reverse removal procedures for center console trim panel and recheck operation.

No adjustment is necessary. Replace park lock cable if ignition switch can be turned with gearshift lever in any position except "P" position, or if gearshift lever can be moved from "P" position with ignition switch in LOCK position.

"Z" Body

  1. Place gearshift lever in "P" position and remove ignition key. Remove cup holder/ashtray assembly. Lift lock tab on park lock cable end. (Scheme 46) Depress gearshift lever button quickly 3 times to set starting position of cable. Using a sharp pencil, mark starting position on slider.
  2. Using a feeler gauge for adjustment, move park lock cable towards shifter base.049" (1.25 mm). Push lock tab of shift lock cable end to set position.
  3. With ignition switch turned to LOCK position and gearshift lever in "P" position, attempt to shift out of "P" position. Gearshift lever should not move. Turn ignition switch to ON position. Gearshift lever should be allowed movement from "P" position. Place gearshift lever in any position except "P" position. Ignition switch should not be able to be turned to LOCK position and key should not be removable. Place gearshift lever in "P" position. Ignition switch should be able to turn to LOCK position and ignition key should be removable.
  4. If park lock cable does not operate as specified, readjust cable. Check gearshift cable adjustment. See ADJUSTMENTS in appropriate AUTOMATIC TRANSMISSION SERVICING article in TRANSMISSION SERVICING. Install cup holder/ashtray assembly.

Scheme 46

Scheme 46
Scheme 46

Note. Shift interlock solenoid is non-adjustable. If shift interlock system is out of adjustment, check park lock cable adjustment. See PARK LOCK CABLE . If adjustment is not possible or does not correct concern, replace necessary components. Some models require that park lock cable and BTSI solenoid be replaced as an assembly.

PROGRAMMING PROCEDURE

Note. Module reprogramming is also referred to as module personalization.

REAR INTEGRATION MODULE (RIM)

If Drivers Information Center (DIC) ON and OFF lights are illuminated, settings for that feature will not be able to be changed. When DIC ON and OFF lights are illuminated, this indicates a module did not respond to cluster with personalization information when "Feature Programming" mode was entered.

If DIC ON and OFF lights are blank (not illuminated), cluster has received invalid data from module(s) in question and settings for that feature will not be able to be changed using DIC. This will occur when 2 different modules are involved in same setting and modules do not agree as to whether feature is ON or OFF. This could also occur if a module sends an invalid state to cluster.

Scan tool will have to be used to toggle feature setting for module(s) in question so that they agree or contain valid states. Once they agree, DIC can be used to change settings if needed. Use following steps to personalize module

  1. Turn ignition switch to ON position. Ensure vehicle is in "P" position. If equipped with memory, press appropriate memory button "1" or "2" located on drivers door panel, prior to programming. Press INFO button one or more times until "Feature Programming" prompt appears on DIC.
  2. Press ON/OFF button to enter "Feature Programming" mode. Press down arrow on INFO button to select personalization feature to be programmed. Press ON/OFF button to turn personalization feature ON or OFF. To exit, press INFO RESET button and turn ignition switch to OFF position.

REMOVAL & INSTALLATION

WARNINGWhen battery is disconnected, vehicle computer and memory systems may lose memory data. Driveability problems may exist until computer systems have completed a relearn cycle. Before disconnecting battery, see COMPUTER RELEARN PROCEDURES article in APPLICATIONS & IDENTIFICATION.

Note. For steering column and component removal and installation procedures, see appropriate STEERING COLUMNS article in STEERING. Removal and installation procedures for shift interlock components on vehicles equipped with floor shifter are not available.

Fig. 24: Shift Interlock System Wiring Diagram (1999 Alero & Grand Am)
Scheme 24: Shift Interlock System Wiring Diagram (1999 Alero & Grand Am)
Fig. 25: Shift Interlock System Wiring Diagram (1999 Aurora & Riviera)
Scheme 25: Shift Interlock System Wiring Diagram (1999 Aurora & Riviera)
Fig. 26: Shift Interlock System Wiring Diagram (1999 Bonneville, Eighty Eight, LeSabre & LSS)
Scheme 26: Shift Interlock System Wiring Diagram (1999 Bonneville, Eighty Eight, LeSabre & LSS)
Fig. 27: Shift Interlock System Wiring Diagram (1999 Camaro & Firebird)
Scheme 27: Shift Interlock System Wiring Diagram (1999 Camaro & Firebird)
Fig. 28: Shift Interlock System Wiring Diagram (1999 Catera)
Scheme 28: Shift Interlock System Wiring Diagram (1999 Catera)
Fig. 29: Shift Interlock System Wiring Diagram (1999 Cavalier & Sunfire)
Scheme 29: Shift Interlock System Wiring Diagram (1999 Cavalier & Sunfire)
Fig. 30: Shift Interlock System Wiring Diagram (1999 Century & Regal)
Scheme 30: Shift Interlock System Wiring Diagram (1999 Century & Regal)
Fig. 31: Shift Interlock System Wiring Diagram (1999 Corvette)
Scheme 31: Shift Interlock System Wiring Diagram (1999 Corvette)
Fig. 32: Shift Interlock System Wiring Diagram (1999 Cutlass & Malibu)
Scheme 32: Shift Interlock System Wiring Diagram (1999 Cutlass & Malibu)
Fig. 33: Shift Interlock System Wiring Diagram (1999 DeVille & Eldorado)
Scheme 33: Shift Interlock System Wiring Diagram (1999 DeVille & Eldorado)
Fig. 34: Shift Interlock System Wiring Diagram (1999 Grand Prix)
Scheme 34: Shift Interlock System Wiring Diagram (1999 Grand Prix)
Fig. 35: Shift Interlock System Wiring Diagram (1999 Intrigue)
Scheme 35: Shift Interlock System Wiring Diagram (1999 Intrigue)
Fig. 36: Shift Interlock System Wiring Diagram (1999 Lumina & Monte Carlo)
Scheme 36: Shift Interlock System Wiring Diagram (1999 Lumina & Monte Carlo)
Fig. 37: Shift Interlock System Wiring Diagram (1999 Metro & Firefly (Canadian))
Scheme 37: Shift Interlock System Wiring Diagram (1999 Metro & Firefly (Canadian))
Fig. 38: Shift Interlock System Wiring Diagram (1999 Prizm)
Scheme 38: Shift Interlock System Wiring Diagram (1999 Prizm)
Fig. 39: Shift Interlock System Wiring Diagram (1999 Park Avenue)
Scheme 39: Shift Interlock System Wiring Diagram (1999 Park Avenue)

Park lock System Wiring Diagram (1999 Regal). Scheme 47

Scheme 47: Park lock System Wiring Diagram (1999 Regal)
Scheme 47: Park lock System Wiring Diagram (1999 Regal)
Fig. 41: Shift Interlock System Wiring Diagram (1999 Saturn)
Scheme 41: Shift Interlock System Wiring Diagram (1999 Saturn)
Fig. 42: Shift Interlock System Wiring Diagram (1999 Seville)
Scheme 42: Shift Interlock System Wiring Diagram (1999 Seville)

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