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Shift Interlock System Chevrolet Cavalier III

Automatic Trans 51 illustrations ~18775 words

MODEL IDENTIFICATION

Body Code (1)Model
"C"Park Avenue
"E"Eldorado
"F"Camaro & Firebird
"H"Bonneville & LeSabre
"J"Cavalier, Saturn "L" Series & Sunfire
"K"DeVille & Seville
"M"Metro & Firefly (Canadian)
"N"Alero, Grand Am & Malibu
"S"Prizm
"V"Catera
"W"Century, Grand Prix, Impala, Intrigue, Lumina, Monte Carlo & Regal
"Y"Corvette
(1) Vehicle body code is 4th character of VIN.
(1)Vehicle body code is 4th 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 by park lock cable. 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 and wire colors, see appropriate wiring diagram in WIRING DIAGRAMS . For connector terminal identification, see appropriate connector in CONNECTOR VIEWS .

PRELIMINARY 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 .

SYSTEM OPERATION CHECK

Once familiar with system being diagnosed, check for correct operation of BTSI & PARK LOCK SYSTEM. If adjustments are necessary, see ADJUSTMENTS .

  1. Place gearshift lever in Park. Turn lock cylinder to OFF-LOCK position. Remove key. If lock cylinder cannot be turned to OFF-LOCK position or key cannot be removed, perform appropriate adjustment procedure.
  2. With lock cylinder in OFF-LOCK position, try to move gearshift lever out of Park. If gearshift lever can be moved out of Park, perform appropriate adjustment procedure.
  3. Turn lock cylinder to RUN position. Try to move gearshift lever out of Park. If gearshift lever can be moved out of Park, perform appropriate adjustment procedure. Depress brake pedal and move gearshift lever out of Park. If gearshift lever cannot be moved out of Park, perform appropriate adjustment procedure.
  4. Try to turn lock cylinder to OFF-LOCK position. Ignition switch should stop turning before reaching the OFF-LOCK position, and key should not be able to be removed. If system does not operate as specified, perform appropriate adjustment procedure.
  5. With key in same position as in previous step (just before OFF-LOCK position), place gearshift lever in Park. Turn lock cylinder toward RUN position, and then to OFF-LOCK position. Remove key.

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 components

  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, perform appropriate test in the following SYMPTOM TESTS

  1. «SHIFT LOCK CONTROL INOPERATIVE»(/chevrolet/cavalier/iii-1995-2005/remont/automatic-trans/#shift-interlock-system__shift-lock-control-inoperative)
  2. «SHIFT LOCK CONTROL ALWAYS ON (IGNITION IN ON POSITION)»(/chevrolet/cavalier/iii-1995-2005/remont/automatic-trans/#shift-interlock-system__shift-lock-control-always-on-ignition)
  3. «SHIFT LOCK CONTROL INOPERATIVE (BTSI INDICATOR INOPERATIVE) - "V" BODY (CATERA)»(/chevrolet/cavalier/iii-1995-2005/remont/automatic-trans/#shift-interlock-system__shift-lock-control-inoperative-btsi-indicator)
  4. «KEY CANNOT BE REMOVED (IGNITION IN OFF POSITION) - "V" BODY (CATERA)»(/chevrolet/cavalier/iii-1995-2005/remont/automatic-trans/#shift-interlock-system__key-cannot-be-removed-ignition-in)
  5. «STEERING COLUMN LOCK MALFUNCTION - "W" BODY (GRAND PRIX & REGAL)»(/chevrolet/cavalier/iii-1995-2005/remont/automatic-trans/#shift-interlock-system__steering-column-lock-malfunction-w)

PROGRAMMING PROCEDURE

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

REAR INTEGRATION MODULE

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.

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) solenoid is referred to as brakelight switch or stoplamp switch. (Scheme 119)- (Scheme 138).

Scheme 119

Scheme 119: CONNECTOR VIEWS
Scheme 119: CONNECTOR VIEWS

Scheme 120

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Scheme 121

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Scheme 122

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Scheme 128

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Scheme 131

Scheme 131
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Scheme 135

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Scheme 136

Scheme 136
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Scheme 137
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Scheme 138

Scheme 138
Scheme 138

SYMPTOM TESTS

CAUTIONUse caution when probing fuse or junction blocks, or any connectors. Damage may 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) solenoid is referred to as brakelight switch or stoplamp switch.

SHIFT LOCK CONTROL INOPERATIVE

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. Disconnect brakelight switch connector. Install scan tool to 16-pin Data Link Connector (DLC). Turn ignition switch to ON position. Using test light connected to ground, probe power feed circuit at brakelight switch connector. Using scan tool, command BRAKE to shift output on. If test light illuminates, go to step 3 . If test light does not illuminate, go to next step.
  2. Check power feed circuit of brakelight switch for an open. See «WIRING DIAGRAMS»(/chevrolet/cavalier/iii-1995-2005/remont/automatic-trans/#shift-interlock-system) . Repair as necessary. If condition was not corrected, go to step 5 .
  3. Turn ignition switch to OFF position. Reconnect brakelight switch connector. Disconnect BTSI solenoid connector. Turn ignition switch to ON position. Using test light connected to ground, probe power feed circuit at BTSI solenoid connector. Using scan tool, command BRAKE to shift output on. If test light illuminates, go to step 8 . If test light does not illuminate, go to next step.
  4. Check power feed circuit of BTSI solenoid for an open. See «WIRING DIAGRAMS»(/chevrolet/cavalier/iii-1995-2005/remont/automatic-trans/#shift-interlock-system) . Repair as necessary. If condition was not corrected, go to step 7 .
  5. Inspect for poor connections at Body Control Module (BCM) harness connector. Repair as necessary. If condition was not corrected, go to next step.
  6. Replace BCM, then go to step 11 . See appropriate BODY CONTROL MODULES article in ACCESSORIES & EQUIPMENT.
  7. Check brakelight switch for proper installation and adjustment. Inspect for poor connections at brakelight switch. Repair as necessary. If condition was not corrected, replace brakelight switch, then go to step 11 .
  8. Connect a test light between power feed circuit and ground circuit of BTSI solenoid. Using scan tool, command BRAKE to shift output on. If test light does not illuminate, go to step 10 . If test light illuminates, go to next step.
  9. Check BTSI solenoid for proper adjustment. Inspect for poor connections at BTSI solenoid. Repair as necessary. If condition was not corrected, replace BTSI solenoid, then go to step 11 .
  10. Repair ground circuit of BTSI solenoid, 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»(/chevrolet/cavalier/iii-1995-2005/remont/automatic-trans/#shift-interlock-system__shift-interlock-solenoid) under DESCRIPTION & OPERATION. If system does not operate correctly, repeat step 1 .

"E" Body (Eldorado)

  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 appropriate BODY CONTROL MODULES 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). See «WIRING DIAGRAMS»(/chevrolet/cavalier/iii-1995-2005/remont/automatic-trans/#shift-interlock-system). Replace PARK/REV fuse (10-amp), then go to step 14.
  3. Check CRUISE fuse (10-amp) in underhood fuse/relay center. If CRUISE fuse is okay, go to next step. If CRUISE fuse is blown, repair short to ground in circuit between park relay located in rear compartment relay center No. 5 and CRUISE fuse (10-amp). See «WIRING DIAGRAMS»(/chevrolet/cavalier/iii-1995-2005/remont/automatic-trans/#shift-interlock-system). Replace CRUISE fuse (10-amp), then go to step 14.
  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»(/chevrolet/cavalier/iii-1995-2005/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»(/chevrolet/cavalier/iii-1995-2005/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 119) 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»(/chevrolet/cavalier/iii-1995-2005/remont/automatic-trans/#shift-interlock-system).
  8. Measure voltage between brakelight switch 4-pin connector C2 terminals "A" and "B". (Scheme 119) 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 121) 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»(/chevrolet/cavalier/iii-1995-2005/remont/automatic-trans/#shift-interlock-system).
  10. Measure voltage between BTSI solenoid connector terminals "A" and "B". (Scheme 121) 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»(/chevrolet/cavalier/iii-1995-2005/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 - 4.6L "E" & "K" BODIES article in ENGINE PERFORMANCE.
  12. Turn ignition switch to OFF position. Disconnect PZM (BCM) 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»(/chevrolet/cavalier/iii-1995-2005/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»(/chevrolet/cavalier/iii-1995-2005/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 - 5.7L "F" & "Y" BODIES article 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»(/chevrolet/cavalier/iii-1995-2005/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 121) 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 121) 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»(/chevrolet/cavalier/iii-1995-2005/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»(/chevrolet/cavalier/iii-1995-2005/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»(/chevrolet/cavalier/iii-1995-2005/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»(/chevrolet/cavalier/iii-1995-2005/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»(/chevrolet/cavalier/iii-1995-2005/remont/automatic-trans/#shift-interlock-system__shift-interlock-solenoid) under DESCRIPTION & OPERATION. If system does not operate correctly, repeat step 1.

"H" Body (Bonneville & LeSabre)

  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 123) 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 123) 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. On Bonneville, check NSBU fuse (10-amp) or on LeSabre, check PRK/REV fuse (10-amp), located at rear fuse block, under left rear seat. On all models, if fuse is blown, repair short to ground in power circuit to BTSI solenoid, then go to step 8. See «WIRING DIAGRAMS»(/chevrolet/cavalier/iii-1995-2005/remont/automatic-trans/#shift-interlock-system). If fuse is okay, repair open circuit between brakelight switch and appropriate fuse, then go to step 8. See «WIRING DIAGRAMS»(/chevrolet/cavalier/iii-1995-2005/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 119) 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»(/chevrolet/cavalier/iii-1995-2005/remont/automatic-trans/#shift-interlock-system).
  5. Measure voltage between brakelight switch 4-pin connector C1 terminals "A" and "B". (Scheme 119) 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»(/chevrolet/cavalier/iii-1995-2005/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 121) 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»(/chevrolet/cavalier/iii-1995-2005/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 appropriate ground connector for damaged or loose terminals. If ground connector terminal is okay, repair open circuit between BTSI solenoid and ground, then go to next step. See «WIRING DIAGRAMS»(/chevrolet/cavalier/iii-1995-2005/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»(/chevrolet/cavalier/iii-1995-2005/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. Connect a test light between ground and BTSI solenoid power feed circuit at BTSI solenoid connector. Turn ignition switch to ON position. If test light does not illuminate, go to step 4 . If test light illuminates, go to next step.
  2. Check BTSI solenoid controlled ground circuit for an open or short to power. See «WIRING DIAGRAMS»(/chevrolet/cavalier/iii-1995-2005/remont/automatic-trans/#shift-interlock-system) . Repair as necessary. If condition was corrected, go to step 9 . If condition was not corrected, go to next step.
  3. Turn ignition switch to OFF position. Connect a 10-amp fused jumper between ground and automatic transmission controlled ground circuit. Turn ignition switch to ON position. Block wheels and apply parking brake. Attempt to move gearshift lever out of Park position. If movement of gearshift lever out of Park position is not possible, go to step 7 . If movement of gearshift lever out of Park position is possible, go to step 5 .
  4. Repair open in BTSI solenoid power feed circuit, then go to step 9 . See «WIRING DIAGRAMS»(/chevrolet/cavalier/iii-1995-2005/remont/automatic-trans/#shift-interlock-system) .
  5. Inspect for proper BTSI solenoid adjustment. Inspect for poor connections at BTSI solenoid. Repair as necessary. If condition was corrected, go to step 9 . If condition was not corrected, go to next step.
  6. Replace BTSI solenoid, then go to step 9 .
  7. Inspect for poor connections at BCM. See «WIRING DIAGRAMS»(/chevrolet/cavalier/iii-1995-2005/remont/automatic-trans/#shift-interlock-system) . Repair as necessary. If condition was corrected, go to step 9 . If condition was not corrected, go to next step.
  8. Replace BCM, then go to next step. See appropriate BODY CONTROL MODULES article in ACCESSORIES & EQUIPMENT.
  9. Ensure all components disconnected or removed during testing are reconnected and installed on vehicle. Ensure BTSI system operates correctly. See «SHIFT INTERLOCK SOLENOID»(/chevrolet/cavalier/iii-1995-2005/remont/automatic-trans/#shift-interlock-system__shift-interlock-solenoid) under DESCRIPTION & OPERATION. If system does not operate correctly, repeat step 1 .

"K" Body (Deville - With Column Shifter)

  1. Install scan tool to DLC. Turn ignition switch to ON position. Using scan tool, command park relay on. If relay clicks, go to step 6 . If relay does not click, go to next step.
  2. Turn ignition switch to OFF position. Disconnect park relay. Turn ignition switch to ON position. Using test light connected to ground, probe coil side power feed circuit of park relay. See «WIRING DIAGRAMS»(/chevrolet/cavalier/iii-1995-2005/remont/automatic-trans/#shift-interlock-system) . If test light does not illuminate, go to step 16 . If test light illuminates, go to next step.
  3. Connect a test light between control circuit and coil side power feed circuit of park relay. Using scan tool, command park relay on and off. If test light illuminates on and off with each command, go to step 12 . If test light does not illuminate on and off with each command, go to next step.
  4. If test light does not remain illuminated with each command, test control circuit of park relay for an open. See «WIRING DIAGRAMS»(/chevrolet/cavalier/iii-1995-2005/remont/automatic-trans/#shift-interlock-system) . Repair as necessary. If condition was corrected, go to step 23 . If condition was not corrected, go to step 13 . If test light remains illuminated with each command, go to next step.
  5. Check control circuit of park relay for a short to ground. Repair as necessary. If condition was corrected, go to step 23 . If condition was not corrected, go to step 13 .
  6. Turn ignition switch to OFF position. Disconnect park relay. Turn ignition switch to ON position. Using test light connected to ground, probe switch side power feed circuit of park relay. If test light does not illuminate, go to step 17 . If test light illuminates, go to next step.
  7. Turn ignition switch to OFF position. Reconnect park relay. Disconnect brakelight switch connector. Turn ignition switch to ON position. Using test light connected to ground, probe power feed circuit of brakelight switch connector. Using scan tool, command park relay on. If test light does not illuminate, go to step 9 . If test light illuminates, go to next step.
  8. Turn ignition switch to OFF position. Reconnect brakelight switch connector. Disconnect BTSI solenoid connector. Turn ignition switch to ON position. Using test light connected to ground, probe power feed circuit of BTSI solenoid connector. Using scan tool, command park relay on. If test light does not illuminate, go to step 10 . If test light illuminates, go to step 11 .
  9. Check power feed circuit of brakelight switch for an open. See «WIRING DIAGRAMS»(/chevrolet/cavalier/iii-1995-2005/remont/automatic-trans/#shift-interlock-system) . Repair as necessary. If condition was corrected, go to step 23 . If condition was not corrected, go to step 12 .
  10. Check power feed circuit of BTSI solenoid for an open. Repair as necessary. If condition was corrected, go to step 23 . If condition was not corrected, go to step 14 .
  11. Connect a test light between power feed circuit and ground circuit of BTSI solenoid connector. Using scan tool, command park relay on. If test light does not illuminate, go to step 18 . If test light illuminates, go to step 15 .
  12. Inspect for poor connections at park relay. See «WIRING DIAGRAMS»(/chevrolet/cavalier/iii-1995-2005/remont/automatic-trans/#shift-interlock-system) . Repair as necessary. If condition was corrected, go to step 23 . If condition was not corrected, go to step 20 .
  13. Inspect for poor connections at REAR INTEGRATION MODULE (RIM) harness connector. Repair as necessary. If condition was corrected, go to step 23 . If condition was not corrected, go to step 21 .
  14. Inspect brakelight switch for proper adjustment. Inspect for poor connections at brakelight switch. Repair as necessary. If condition was corrected, go to step 23 . If condition was not corrected, go to step 19 .
  15. Inspect BTSI solenoid for proper adjustment and free mechanical movement. Inspect for poor connections at BTSI solenoid. Repair as necessary. If condition was corrected, go to step 23 . If condition was not corrected, go to step 22 .
  16. Repair coil side power feed circuit of park relay, then go to step 23 . See «WIRING DIAGRAMS»(/chevrolet/cavalier/iii-1995-2005/remont/automatic-trans/#shift-interlock-system) .
  17. Repair switch side power feed circuit of park relay, then go to step 23 .
  18. Repair ground circuit of BTSI solenoid, then go to step 23 .
  19. Replace brakelight switch, then go to step 23 .
  20. Replace park relay, then go to step 23 .
  21. Replace RIM, then go to step 23 . See «REAR INTEGRATION MODULE»(/chevrolet/cavalier/iii-1995-2005/remont/automatic-trans/#shift-interlock-system__rear-integration-module) under PROGRAMMING PROCEDURE.
  22. Replace BTSI solenoid, then go to next step.
  23. Ensure all components disconnected or removed during testing are reconnected and installed on vehicle. Ensure BTSI system operates correctly. See «SHIFT INTERLOCK SOLENOID»(/chevrolet/cavalier/iii-1995-2005/remont/automatic-trans/#shift-interlock-system__shift-interlock-solenoid) under DESCRIPTION & OPERATION. If system does not operate correctly, repeat step 1 .

"K" Body (Deville - With Console Shifter)

  1. Install scan tool to DLC. Turn ignition switch to ON position. Using scan tool, command park relay on. If relay clicks, go to step 7 . If relay does not click, go to next step.
  2. Turn ignition switch to OFF position. Disconnect park relay. Turn ignition switch to ON position. Using test light connected to ground, probe coil side power feed circuit of park relay. See «WIRING DIAGRAMS»(/chevrolet/cavalier/iii-1995-2005/remont/automatic-trans/#shift-interlock-system) . If test light does not illuminate, go to step 19 . If test light illuminates, go to next step.
  3. Connect a test light between control circuit and coil side power feed circuit of park relay. Using scan tool, command park relay on and off. If test light illuminates on and off with each command, go to step 15 . If test light does not illuminate on and off with each command, go to next step.
  4. If test light illuminates with each command, go to step 6 . If test light does not illuminate with each command, go to next step.
  5. Check control circuit of park relay for an open. Repair as necessary. If condition was corrected, go to step 26 . If condition was not corrected, go to step 16 .
  6. Check control circuit of park relay for a short to ground. Repair as necessary. If condition was corrected, go to step 26 . If condition was not corrected, go to step 16 .
  7. Turn ignition switch to OFF position. Disconnect park relay. Turn ignition switch to ON position. Using test light connected to ground, probe switch side power feed circuit of park relay. See «WIRING DIAGRAMS»(/chevrolet/cavalier/iii-1995-2005/remont/automatic-trans/#shift-interlock-system) . If test light does not illuminate, go to step 20 . If test light illuminates, go to next step.
  8. Turn ignition switch to OFF position. Reconnect park relay. Disconnect brakelight switch connector. Turn ignition switch to ON position. Using test light connected to ground, probe power feed circuit of brakelight switch connector. Using scan tool, command park relay on. If test does not illuminate, go to step 10 . If test light illuminates, go to next step.
  9. Turn ignition switch to OFF position. Reconnect brakelight switch connector. Disconnect BTSI solenoid connector. Turn ignition switch to ON position. Using test light connected to ground, probe power feed circuit of BTSI solenoid connector. See «WIRING DIAGRAMS»(/chevrolet/cavalier/iii-1995-2005/remont/automatic-trans/#shift-interlock-system) . Using scan tool, command park relay on. If test light does not illuminate, go to step 11 . If test light illuminates, go to step 12 .
  10. Check power feed circuit of brakelight switch for an open. See «WIRING DIAGRAMS»(/chevrolet/cavalier/iii-1995-2005/remont/automatic-trans/#shift-interlock-system) . Repair as necessary. If condition was corrected, go to step 26 . If condition was not corrected, go to step 15 .
  11. Check internal relay coil side power feed circuit of BTSI solenoid for an open. Repair as necessary. If condition was corrected, go to step 26 . If condition was not corrected, go to step 17
  12. Connect a test light between internal relay coil side power feed circuit and ground circuit of BTSI solenoid connector. Using scan tool, command park relay on. If test light does not illuminate, go to step 21 . If test light illuminates, go to next step.
  13. Connect a test light between internal relay switch side power feed circuit and ground circuit of BTSI solenoid connector. If test light illuminates, go to step 18 . If test light does not illuminate, go to next step.
  14. Check internal relay switch side power feed circuit of BTSI solenoid for an open or ground. See «WIRING DIAGRAMS»(/chevrolet/cavalier/iii-1995-2005/remont/automatic-trans/#shift-interlock-system) . Repair as necessary. If condition was corrected, go to step 26 .
  15. Inspect for poor connections at park relay. Repair as necessary. If condition was corrected, go to step 26 . If condition was not corrected, go to step 23 .
  16. Inspect for poor connections at REAR INTEGRATION MODULE (RIM) harness connector. Repair as necessary. If condition was corrected, go to step 26 . If condition was not corrected, go to step 24 .
  17. Inspect brakelight switch for proper adjustment. Inspect for poor connections at brakelight switch. See «WIRING DIAGRAMS»(/chevrolet/cavalier/iii-1995-2005/remont/automatic-trans/#shift-interlock-system) . Repair as necessary. If condition was corrected, go to step 26 . If condition was not corrected, go to step 22 .
  18. Inspect BTSI solenoid for proper adjustment and free mechanical movement. Inspect for poor connections at BTSI solenoid. Repair as necessary. If condition was corrected, go to step 26 . If condition was not corrected, go to step 25 .
  19. Repair coil side power feed circuit of park relay, then go to step 26 .
  20. Repair switch side power feed circuit of park relay, then go to step 26 .
  21. Repair ground circuit of BTSI solenoid, then go to step 26 .
  22. Replace brakelight switch, then go to step 26 .
  23. Replace park relay, then go to step 26 .
  24. Replace RIM, then go to step 26 . See «REAR INTEGRATION MODULE»(/chevrolet/cavalier/iii-1995-2005/remont/automatic-trans/#shift-interlock-system__rear-integration-module) under PROGRAMMING PROCEDURE.
  25. Replace BTSI solenoid, then go to next step.
  26. Ensure all components disconnected or removed during testing are reconnected and installed on vehicle. Ensure BTSI system operates correctly. See «SHIFT INTERLOCK SOLENOID»(/chevrolet/cavalier/iii-1995-2005/remont/automatic-trans/#shift-interlock-system__shift-interlock-solenoid) under DESCRIPTION & OPERATION. If system does not operate correctly, repeat step 1 .

"K" Body (Seville)

  1. Check NSBU fuse (10-amp) located in rear fuse 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»(/chevrolet/cavalier/iii-1995-2005/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. Using scan tool, command park relay to cycle ON and OFF. Locate park relay in rear fuse 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 124) 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 124)and (Scheme 125). See «WIRING DIAGRAMS»(/chevrolet/cavalier/iii-1995-2005/remont/automatic-trans/#shift-interlock-system).
  4. Using test light, jumper between park relay terminals No. 85 and 86. (Scheme 124) 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 voltage or poor connections between park relay connector terminal No. 86 and Rear Integration Module (RIM) 24-pin connector C2 terminal "B2". (Scheme 124)and (Scheme 133). See «WIRING DIAGRAMS»(/chevrolet/cavalier/iii-1995-2005/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»(/chevrolet/cavalier/iii-1995-2005/remont/automatic-trans/#shift-interlock-system__rear-integration-module) 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»(/chevrolet/cavalier/iii-1995-2005/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 119) 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»(/chevrolet/cavalier/iii-1995-2005/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 119) 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 121) 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»(/chevrolet/cavalier/iii-1995-2005/remont/automatic-trans/#shift-interlock-system).
  11. Connect test light between BTSI solenoid connector terminals "A" and "B". (Scheme 121) 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»(/chevrolet/cavalier/iii-1995-2005/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»(/chevrolet/cavalier/iii-1995-2005/remont/automatic-trans/#shift-interlock-system__shift-interlock-solenoid) under DESCRIPTION & OPERATION. If system does not operate correctly, repeat step 1.

"M" Body (Metro & Firefly (Canadian))

  1. Place manual selector in Park. Turn ignition switch to ON position. Depress brake pedal. Check for battery voltage at terminal "B" of brakelight switch. (Scheme 119) See «WIRING DIAGRAMS»(/chevrolet/cavalier/iii-1995-2005/remont/automatic-trans/#shift-interlock-system). If battery voltage is present, go to step 9. If battery voltage is not present, go to next step.
  2. Check for battery voltage at terminal "D" of brakelight switch. If battery voltage is not present, go to step 4. If battery voltage is present, go to next step.
  3. Replace or adjust brakelight switch, then go to step 14.
  4. Check for battery voltage at terminal "J" of transaxle range switch. (Scheme 127) If battery voltage is not present, go to step 6. If battery voltage is present, go to next step.
  5. Repair open in Orange/Black wire between transaxle range switch and brakelight switch, then go to step 14. See «WIRING DIAGRAMS»(/chevrolet/cavalier/iii-1995-2005/remont/automatic-trans/#shift-interlock-system).
  6. Check for battery voltage at terminal "I" of transaxle range switch. (Scheme 127) If battery voltage is not present, go to step 8. If battery voltage is present, go to next step.
  7. Replace transaxle range switch, then go to step 14.
  8. Repair open in Yellow wire between transaxle range switch and junction block, then go to step 14.
  9. Place manual selector in Park. Turn ignition switch to ON position. Depress brake pedal. Check for battery voltage at terminal "D" of BTSI solenoid connector. (Scheme 128) See «WIRING DIAGRAMS»(/chevrolet/cavalier/iii-1995-2005/remont/automatic-trans/#shift-interlock-system). If battery voltage is present, go to step 11. If battery voltage is not present, go to next step.
  10. Repair open in Orange/White wire between brakelight switch and BTSI solenoid, then go to step 14.
  11. Check for an open in Black wire between BTSI solenoid connector and ground (G407). See «WIRING DIAGRAMS»(/chevrolet/cavalier/iii-1995-2005/remont/automatic-trans/#shift-interlock-system). If an open is not present, go to 13. If an open is present, go to next step.
  12. Repair open in Black wire between BTSI solenoid and ground (G407), then go to step 14.
  13. Replace BTSI solenoid, 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»(/chevrolet/cavalier/iii-1995-2005/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 C2. Connect a fused jumper between brakelight switch 4-pin connector C2, terminals "A" and "B". (Scheme 119) 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 119), (Scheme 121) or (Scheme 123). See «WIRING DIAGRAMS»(/chevrolet/cavalier/iii-1995-2005/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 Gray connector C1 terminal "F5". (Scheme 121), (Scheme 123) or (Scheme 126). See «WIRING DIAGRAMS»(/chevrolet/cavalier/iii-1995-2005/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 121) 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»(/chevrolet/cavalier/iii-1995-2005/remont/automatic-trans/#shift-interlock-system__shift-interlock-solenoid) under DESCRIPTION & OPERATION. If system does not operate correctly, repeat step 1.

"N" Body (Malibu)

Note. Before performing the following test, check BULMP/BTSI 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 BULMP/BTSI 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 BULMP/BTSI 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 119) 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 119), (Scheme 121) or (Scheme 123). See «WIRING DIAGRAMS»(/chevrolet/cavalier/iii-1995-2005/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 Gray connector C1 terminal "F5". (Scheme 121), (Scheme 123) or (Scheme 126). See «WIRING DIAGRAMS»(/chevrolet/cavalier/iii-1995-2005/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 121) 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»(/chevrolet/cavalier/iii-1995-2005/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. 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 129)and (Scheme 130). See «WIRING DIAGRAMS»(/chevrolet/cavalier/iii-1995-2005/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»(/chevrolet/cavalier/iii-1995-2005/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 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, 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 131) 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). Repair as necessary, then go to step 6. See «WIRING DIAGRAMS»(/chevrolet/cavalier/iii-1995-2005/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 131) 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 S200 located near instrument cluster connector branch off. Repair as necessary, then go to step 6. See «WIRING DIAGRAMS»(/chevrolet/cavalier/iii-1995-2005/remont/automatic-trans/#shift-interlock-system).
  4. Measure resistance between in-line connector C205 terminals No. 6 and 7. (Scheme 131) 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»(/chevrolet/cavalier/iii-1995-2005/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 in-line connector C205 terminal No. 6. See «WIRING DIAGRAMS»(/chevrolet/cavalier/iii-1995-2005/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»(/chevrolet/cavalier/iii-1995-2005/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 122) 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 119)and (Scheme 122). See «WIRING DIAGRAMS»(/chevrolet/cavalier/iii-1995-2005/remont/automatic-trans/#shift-interlock-system).
  3. Using test light, jumper between BTSI solenoid connector terminal "B" and battery power. (Scheme 122) If test light does not illuminate, go to next step. If test light illuminates, replace BTSI solenoid, then go to step 6.
  4. Disconnect Transaxle Range (TR) switch 7-pin connector. Connect test light between TR switch connector terminal "D" and battery power. (Scheme 123) 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»(/chevrolet/cavalier/iii-1995-2005/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 122)and (Scheme 123). See «WIRING DIAGRAMS»(/chevrolet/cavalier/iii-1995-2005/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»(/chevrolet/cavalier/iii-1995-2005/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 122) 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 119) 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»(/chevrolet/cavalier/iii-1995-2005/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»(/chevrolet/cavalier/iii-1995-2005/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 122) If test light does not illuminate, go to next step. If test light illuminates, 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 123) 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, then go to step 7. See «WIRING DIAGRAMS»(/chevrolet/cavalier/iii-1995-2005/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 122)and (Scheme 123). See «WIRING DIAGRAMS»(/chevrolet/cavalier/iii-1995-2005/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»(/chevrolet/cavalier/iii-1995-2005/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 135) 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 119) 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»(/chevrolet/cavalier/iii-1995-2005/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»(/chevrolet/cavalier/iii-1995-2005/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 135) 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»(/chevrolet/cavalier/iii-1995-2005/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 135) 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 switch connector terminal "D" and battery power. (Scheme 123) 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»(/chevrolet/cavalier/iii-1995-2005/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 123)and (Scheme 135). See «WIRING DIAGRAMS»(/chevrolet/cavalier/iii-1995-2005/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»(/chevrolet/cavalier/iii-1995-2005/remont/automatic-trans/#shift-interlock-system__shift-interlock-solenoid) under DESCRIPTION & OPERATION. If system does not operate correctly, repeat step 1.

"W" Body (Impala & Monte Carlo)

  1. Connect a test light between ground and brakelight switch power feed circuit at brakelight switch. Turn ignition switch to ON position. If test light does not illuminate, go to step 6 . If test light illuminates, go to next step.
  2. Connect a test light between ground and brakelight switch signal circuit at brakelight switch. Turn ignition switch to ON position. Press and release brake pedal several times while observing test light. If test light does not turn off and on with brake pedal application, go to step 9 . If test light turns off and on with brake pedal application, go to next step.
  3. Connect a test light between ground and brakelight switch signal circuit at BTSI solenoid. Turn ignition switch to ON position. Press and hold brake pedal. See «WIRING DIAGRAMS»(/chevrolet/cavalier/iii-1995-2005/remont/automatic-trans/#shift-interlock-system) . If test light does not illuminate, go to step 7 . If test light illuminates, go to next step.
  4. Ensure transmission shift lever is in Park position. Connect a test light between controlled ground circuit at BTSI solenoid and battery voltage. Turn ignition switch to ON position. If test light illuminates, go to step 11 . If test light does not illuminate, go to next step.
  5. Connect a test light between controlled ground circuit of BTSI solenoid at BCM and battery positive. Turn ignition switch to ON position. If test light does not illuminate, go to step 13 . If test light illuminates, go to step 8 .
  6. Repair open in brakelight switch power feed circuit, then go step 15 . See «WIRING DIAGRAMS»(/chevrolet/cavalier/iii-1995-2005/remont/automatic-trans/#shift-interlock-system) .
  7. Repair open in brakelight switch signal circuit, then go to step 15 .
  8. Repair open in controlled ground circuit of BTSI solenoid, then go to step 15 .
  9. Inspect for proper brakelight switch adjustment. Inspect for poor connections at brakelight switch. Repair as necessary. If condition was corrected, go to step 15 . If condition was not corrected, go to next step.
  10. Replace brakelight switch, then go to step 15 .
  11. Inspect for poor connections at BTSI solenoid. See «WIRING DIAGRAMS»(/chevrolet/cavalier/iii-1995-2005/remont/automatic-trans/#shift-interlock-system) . Repair as necessary. If condition was corrected, go to step 15 . If condition was not corrected, go to next step.
  12. Replace BTSI solenoid, then go to step 15 .
  13. Inspect for poor connections at BCM. Repair as necessary. If condition was corrected, go to step 15 . If condition was not corrected, go to next step.
  14. Replace BCM, then go to next step. See appropriate BODY CONTROL MODULES article in ACCESSORIES & EQUIPMENT.
  15. Ensure all components disconnected or removed during testing are reconnected and installed on vehicle. Ensure BTSI system operates correctly. See «SHIFT INTERLOCK SOLENOID»(/chevrolet/cavalier/iii-1995-2005/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 121) 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 119)and (Scheme 121). See «WIRING DIAGRAMS»(/chevrolet/cavalier/iii-1995-2005/remont/automatic-trans/#shift-interlock-system). Repair as necessary, 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»(/chevrolet/cavalier/iii-1995-2005/remont/automatic-trans/#shift-interlock-system__shift-interlock-solenoid) under DESCRIPTION & OPERATION. If system does not operate correctly, repeat step 1.

"W" Body (Lumina)

  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 121) 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 119) See «WIRING DIAGRAMS»(/chevrolet/cavalier/iii-1995-2005/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»(/chevrolet/cavalier/iii-1995-2005/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 122) 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 119)and (Scheme 122). See «WIRING DIAGRAMS»(/chevrolet/cavalier/iii-1995-2005/remont/automatic-trans/#shift-interlock-system).
  3. Using test light, jumper between BTSI solenoid connector terminal "B" and battery power. (Scheme 122) If test light does not illuminate, go to next step. If test light illuminates, replace BTSI solenoid, then go to step 6.
  4. Disconnect Transaxle Range (TR) switch 7-pin connector. Connect test light between TR switch connector terminal "D" and battery power. (Scheme 123) 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»(/chevrolet/cavalier/iii-1995-2005/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 122)and (Scheme 123). See «WIRING DIAGRAMS»(/chevrolet/cavalier/iii-1995-2005/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»(/chevrolet/cavalier/iii-1995-2005/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 123) 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. Turn ignition switch to OFF position. Check for continuity between PNP switch 7-pin connector terminals "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 121)and (Scheme 123). 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»(/chevrolet/cavalier/iii-1995-2005/remont/automatic-trans/#shift-interlock-system).
  4. Check for continuity between brakelight switch 4-pin connector C2 terminals "A" and "B". (Scheme 121) 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 121)and (Scheme 138). 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»(/chevrolet/cavalier/iii-1995-2005/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 138) 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»(/chevrolet/cavalier/iii-1995-2005/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 123) See «WIRING DIAGRAMS»(/chevrolet/cavalier/iii-1995-2005/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 123) 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»(/chevrolet/cavalier/iii-1995-2005/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 123) 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»(/chevrolet/cavalier/iii-1995-2005/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 121)and (Scheme 138). See «WIRING DIAGRAMS»(/chevrolet/cavalier/iii-1995-2005/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»(/chevrolet/cavalier/iii-1995-2005/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. 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 OFF position. Disconnect BTSI solenoid connector. Turn ignition switch to ON position. Depress brake pedal. Using test light connected to ground, probe power feed circuit of BTSI solenoid connector. If test light does not illuminate, go to step 4 . If test light illuminates, go to next step.
  2. Check power feed circuit of BTSI solenoid for a short to voltage. See «WIRING DIAGRAMS»(/chevrolet/cavalier/iii-1995-2005/remont/automatic-trans/#shift-interlock-system) . Repair as necessary. If condition was not corrected, go to next step.
  3. Check brakelight switch adjustment. Inspect for poor connections at brakelight switch. Repair as necessary. If condition was not corrected, replace brakelight switch, then go to step 5 .
  4. Check BTSI solenoid for proper adjustment. Inspect for poor connections at BTSI solenoid. Repair as necessary. If condition was not corrected, replace BTSI solenoid, then go to next step.
  5. Ensure all components disconnected or removed during testing are reconnected and installed on vehicle. Ensure BTSI system operates correctly. See «SHIFT INTERLOCK SOLENOID»(/chevrolet/cavalier/iii-1995-2005/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 appropriate BODY CONTROL MODULES 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 voltage 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»(/chevrolet/cavalier/iii-1995-2005/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 121) If test light illuminates, repair short to voltage 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»(/chevrolet/cavalier/iii-1995-2005/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 121) 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»(/chevrolet/cavalier/iii-1995-2005/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 121) If voltage is more than.5 volt, repair short to voltage in circuit between brakelight switch 4-pin connector C1 terminal "B" and BTSI solenoid terminal "A", then go to next step. See «WIRING DIAGRAMS»(/chevrolet/cavalier/iii-1995-2005/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»(/chevrolet/cavalier/iii-1995-2005/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 controlled ground circuit at BTSI solenoid. Turn ignition switch to ON position. Press brake pedal. Attempt to move gearshift lever out of Park position. If movement of gearshift lever is not possible, go to step 5 . If movement of gearshift lever is possible, go to next step.
  2. Check BTSI solenoid controlled ground circuit for a short to ground. See «WIRING DIAGRAMS»(/chevrolet/cavalier/iii-1995-2005/remont/automatic-trans/#shift-interlock-system) . Repair as necessary. If condition was corrected, go to step 7 . If condition was not corrected, go to next step.
  3. Inspect for poor connections at BCM. Repair as necessary. If condition was corrected, go to step 7 . If condition was not corrected, go to next step.
  4. Replace BCM, then go to step 7 . See appropriate BODY CONTROL MODULES article in ACCESSORIES & EQUIPMENT.
  5. Inspect BTSI solenoid for proper adjustment. Inspect for poor connections at BTSI solenoid. See «WIRING DIAGRAMS»(/chevrolet/cavalier/iii-1995-2005/remont/automatic-trans/#shift-interlock-system) . Repair as necessary. If condition was corrected, go to step 7 . If condition was not corrected, go to next step.
  6. Replace BTSI solenoid, 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»(/chevrolet/cavalier/iii-1995-2005/remont/automatic-trans/#shift-interlock-system__shift-interlock-solenoid) under DESCRIPTION & OPERATION. If system does not operate correctly, repeat step 1 .

"K" Body (Deville)

  1. Disconnect BTSI switch. Turn ignition switch to ON position. Press and hold brake pedal. Attempt to move gearshift lever out of Park position. If gearshift lever moves out of Park position, go to step 3 . If gearshift lever does not move out of Park position, go to next step.
  2. Check BTSI signal circuit for a short to voltage. See «WIRING DIAGRAMS»(/chevrolet/cavalier/iii-1995-2005/remont/automatic-trans/#shift-interlock-system) . Repair as necessary. If condition was corrected, go to step 7 . If condition was not corrected, go to step 5 .
  3. Inspect brakelight switch for proper adjustment. Inspect for poor connections at brakelight switch connector. Repair as necessary. If condition was corrected, go to step 7 . If condition was not corrected, go to next step.
  4. Replace brakelight switch, then go to step 7 .
  5. Inspect BTSI solenoid for proper adjustment and free of mechanical movement. Inspect for poor connections at BTSI solenoid connector. See «WIRING DIAGRAMS»(/chevrolet/cavalier/iii-1995-2005/remont/automatic-trans/#shift-interlock-system) . Repair as necessary. If condition was corrected, go to 7 . If condition was not corrected, go to next step.
  6. Replace BTSI solenoid, 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»(/chevrolet/cavalier/iii-1995-2005/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)

  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 OFF 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 121) 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 119)and (Scheme 121). See «WIRING DIAGRAMS»(/chevrolet/cavalier/iii-1995-2005/remont/automatic-trans/#shift-interlock-system). Repair as necessary, 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»(/chevrolet/cavalier/iii-1995-2005/remont/automatic-trans/#shift-interlock-system__shift-interlock-solenoid) under DESCRIPTION & OPERATION. If system does not operate correctly, repeat step 1.
  1. Check for battery voltage at terminal "D" of BTSI solenoid connector. (Scheme 128) See «WIRING DIAGRAMS»(/chevrolet/cavalier/iii-1995-2005/remont/automatic-trans/#shift-interlock-system). If battery voltage is not present, go to step 5. If battery voltage is present, go to next step.
  2. Check for short to voltage in Orange/White wire between brakelight switch and BTSI solenoid. If short to voltage is not present, go to 4. If short to voltage is present, go to next step.
  3. Repair short to voltage in Orange/White wire between brakelight switch and BTSI solenoid, then go to step 6. See «WIRING DIAGRAMS»(/chevrolet/cavalier/iii-1995-2005/remont/automatic-trans/#shift-interlock-system).
  4. Replace brakelight switch, then go to 6.
  5. Replace BTSI solenoid, 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»(/chevrolet/cavalier/iii-1995-2005/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 119)and (Scheme 121). See «WIRING DIAGRAMS»(/chevrolet/cavalier/iii-1995-2005/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»(/chevrolet/cavalier/iii-1995-2005/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 119)and (Scheme 121). See «WIRING DIAGRAMS»(/chevrolet/cavalier/iii-1995-2005/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»(/chevrolet/cavalier/iii-1995-2005/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 129) If voltage is 10-14 volts, go to next step. If voltage is not 10-14 volts, repair open in IGNITION circuit between shift lock 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»(/chevrolet/cavalier/iii-1995-2005/remont/automatic-trans/#shift-interlock-system).
  2. Measure voltage between shift lock control module connector terminal No. 1 and ground. (Scheme 129) If voltage is 10-14 volts, go to next step. If voltage is not 10-14 volts, repair open in IGNITION circuit between shift lock 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»(/chevrolet/cavalier/iii-1995-2005/remont/automatic-trans/#shift-interlock-system).
  3. Measure resistance between shift lock control module connector terminal No. 3 and ground. (Scheme 129) 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 130) See «WIRING DIAGRAMS»(/chevrolet/cavalier/iii-1995-2005/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 129) If voltage is 10-14 volts, replace shift lock control module, then go to next step. If voltage is not 10-14 volts, repair open in BRAKE SIGNAL circuit between shift lock 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 130) See «WIRING DIAGRAMS»(/chevrolet/cavalier/iii-1995-2005/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»(/chevrolet/cavalier/iii-1995-2005/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, 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. (Scheme 131) 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 131) 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, mounted on right "A" pillar. Measure voltage between female side of in-line connector C205 terminal No. 8 and ground. (Scheme 131) 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 voltage 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 131)- (Scheme 133). Repair as necessary, then go to next step. See «WIRING DIAGRAMS»(/chevrolet/cavalier/iii-1995-2005/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»(/chevrolet/cavalier/iii-1995-2005/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 DEACTIVATION PROCEDURES article in GENERAL INFORMATION. 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 C2 terminal "A" and ground. (Scheme 119) 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»(/chevrolet/cavalier/iii-1995-2005/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 122) 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»(/chevrolet/cavalier/iii-1995-2005/remont/automatic-trans/#shift-interlock-system). Repair as necessary, then go to step 8.
  5. Using test light, jumper between BTSI solenoid connector terminals "A" and "B". (Scheme 122) 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 123) If test light does not illuminate, repair open circuit or poor connections between TR switch terminal "D" and ground (G129) located on transaxle stud. See «WIRING DIAGRAMS»(/chevrolet/cavalier/iii-1995-2005/remont/automatic-trans/#shift-interlock-system). If test light illuminates, go to next step.
  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»(/chevrolet/cavalier/iii-1995-2005/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»(/chevrolet/cavalier/iii-1995-2005/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 122) 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 119) 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»(/chevrolet/cavalier/iii-1995-2005/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»(/chevrolet/cavalier/iii-1995-2005/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, located at center of console assembly. 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 135) 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 119) 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»(/chevrolet/cavalier/iii-1995-2005/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»(/chevrolet/cavalier/iii-1995-2005/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 connector. Turn ignition switch to ON position. Press and hold brake pedal. Attempt to move gearshift lever out of Park position. If gearshift lever movement from Park position is possible, go to step 4 . If gearshift lever movement from Park position is not possible, go to next step.
  2. Disconnect BTSI solenoid connector. Turn ignition switch to ON position. Press and hold brake pedal. Attempt to move gearshift lever out of Park position. If gearshift lever movement from Park position is not possible, go to step 6 . If gearshift lever movement from Park position is possible, go to next step.
  3. Repair short to battery voltage in brakelight switch signal circuit, then go to step 8 . See «WIRING DIAGRAMS»(/chevrolet/cavalier/iii-1995-2005/remont/automatic-trans/#shift-interlock-system) .
  4. Inspect for proper brakelight switch adjustment. Inspect for poor connections at brakelight switch. Repair as necessary. If condition was corrected, go to step 8 . If condition was not corrected, go to next step.
  5. Replace brakelight switch, then go to step 8 .
  6. Inspect for poor connections at BTSI solenoid. See «WIRING DIAGRAMS»(/chevrolet/cavalier/iii-1995-2005/remont/automatic-trans/#shift-interlock-system) . Repair as necessary. If condition was corrected, go to step 8 . If condition was not corrected, go to next step.
  7. Replace BTSI solenoid, 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»(/chevrolet/cavalier/iii-1995-2005/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»(/chevrolet/cavalier/iii-1995-2005/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 119) See «WIRING DIAGRAMS»(/chevrolet/cavalier/iii-1995-2005/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 119)and (Scheme 121). See «WIRING DIAGRAMS»(/chevrolet/cavalier/iii-1995-2005/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»(/chevrolet/cavalier/iii-1995-2005/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 "C3". Repair as necessary, then go to step 15. (Scheme 119) See «WIRING DIAGRAMS»(/chevrolet/cavalier/iii-1995-2005/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 136) Repair as necessary, then go to step 15. (Scheme 119) See «WIRING DIAGRAMS»(/chevrolet/cavalier/iii-1995-2005/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 119) 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 119)and (Scheme 121). See «WIRING DIAGRAMS»(/chevrolet/cavalier/iii-1995-2005/remont/automatic-trans/#shift-interlock-system).
  10. Using test light, backprobe between BTSI solenoid connector terminals "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 126) 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 126) 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»(/chevrolet/cavalier/iii-1995-2005/remont/automatic-trans/#shift-interlock-system).
  13. Using test light, backprobe between TR switch connector C1 terminal "A" and battery power. (Scheme 123) 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 126) See «WIRING DIAGRAMS»(/chevrolet/cavalier/iii-1995-2005/remont/automatic-trans/#shift-interlock-system).
  14. Using test light, backprobe between TR switch connector C1 terminal "D" and battery power. (Scheme 123) 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 next step. See «WIRING DIAGRAMS»(/chevrolet/cavalier/iii-1995-2005/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»(/chevrolet/cavalier/iii-1995-2005/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»(/chevrolet/cavalier/iii-1995-2005/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»(/chevrolet/cavalier/iii-1995-2005/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 119) 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 119)and (Scheme 121). See «WIRING DIAGRAMS»(/chevrolet/cavalier/iii-1995-2005/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 137) See «WIRING DIAGRAMS»(/chevrolet/cavalier/iii-1995-2005/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 121) 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»(/chevrolet/cavalier/iii-1995-2005/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 121) 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 121) See «WIRING DIAGRAMS»(/chevrolet/cavalier/iii-1995-2005/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»(/chevrolet/cavalier/iii-1995-2005/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 C2 terminal "A" and ground. (Scheme 119) 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»(/chevrolet/cavalier/iii-1995-2005/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 119) 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 135) 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»(/chevrolet/cavalier/iii-1995-2005/remont/automatic-trans/#shift-interlock-system). Repair as necessary, then go to step 8.
  5. Using test light, jumper between BTSI solenoid connector terminals "A" and "E". (Scheme 135) 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 123) If test light does not illuminate, repair open circuit or poor connections between TR switch terminal "D" and ground (G129), located on transaxle stud, then go to step 8. See «WIRING DIAGRAMS»(/chevrolet/cavalier/iii-1995-2005/remont/automatic-trans/#shift-interlock-system). If test light illuminates, go to next step.
  7. Check for open circuit or poor connections between BTSI solenoid connector terminal "A" and TR switch 7-pin connector terminal "B". (Scheme 123)and (Scheme 135). See «WIRING DIAGRAMS»(/chevrolet/cavalier/iii-1995-2005/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»(/chevrolet/cavalier/iii-1995-2005/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 119) 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 138) See «WIRING DIAGRAMS»(/chevrolet/cavalier/iii-1995-2005/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 138) 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»(/chevrolet/cavalier/iii-1995-2005/remont/automatic-trans/#shift-interlock-system__shift-interlock-solenoid) under DESCRIPTION & OPERATION. If system does not operate correctly, repeat step 1.

SHIFT LOCK CONTROL INOPERATIVE (BTSI INDICATOR INOPERATIVE) - "V" BODY (CATERA)

  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 133) 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 133) 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»(/chevrolet/cavalier/iii-1995-2005/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 133) 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»(/chevrolet/cavalier/iii-1995-2005/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 133) 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 voltage in circuit between BCM connector C2 terminal "D11", brakelight switch and automatic transmission shift lock control solenoid. See «WIRING DIAGRAMS»(/chevrolet/cavalier/iii-1995-2005/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 indicator circuit between BCM connector C2 terminal "C15" and BRAKE TO SHIFT indicator. (Scheme 133) See «WIRING DIAGRAMS»(/chevrolet/cavalier/iii-1995-2005/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 133) 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»(/chevrolet/cavalier/iii-1995-2005/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 POWER DOOR LOCKS 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»(/chevrolet/cavalier/iii-1995-2005/remont/automatic-trans/#shift-interlock-system__shift-interlock-solenoid) under DESCRIPTION & OPERATION. If system does not operate correctly, repeat step 1.

KEY CANNOT BE REMOVED (IGNITION IN OFF POSITION) - "V" BODY (CATERA)

  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 134) 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 134) 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»(/chevrolet/cavalier/iii-1995-2005/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»(/chevrolet/cavalier/iii-1995-2005/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.

STEERING COLUMN LOCK MALFUNCTION - "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 135) 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 135) 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»(/chevrolet/cavalier/iii-1995-2005/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»(/chevrolet/cavalier/iii-1995-2005/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 135) 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»(/chevrolet/cavalier/iii-1995-2005/remont/automatic-trans/#shift-interlock-system).
  6. Using test light, backprobe between automatic transaxle control connector terminal "C" and ground. (Scheme 135) 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 122) 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»(/chevrolet/cavalier/iii-1995-2005/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 terminals "A" and "B". (Scheme 122) 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»(/chevrolet/cavalier/iii-1995-2005/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.

COMPONENT TESTS

Note. Component testing is only available for Saturn. For testing all other models, see SYMPTOM TESTS .

BTSI SOLENOID

Check solenoid connector for open, spread or corroded terminals. Remove BTSI solenoid. Ground terminal "A" of BTSI solenoid and apply 12 volts to terminal "B". (Scheme 121) When 12 volts are applied to BTSI solenoid, actuator rod should not be able to move. If actuator rod can move with 12 volts applied, replace BTSI solenoid. (Scheme 139)

BRAKELIGHT SWITCH (BTSI SOLENOID)

Check brakelight switch connector for opens, spread or corroded terminals. Test switch by checking continuity across terminal "A" and terminal No. 4 of switch. (Scheme 120) Continuity should be present with brake released. Continuity should not be present with brake applied. If damaged, replace brakelight switch.

Scheme 139

Scheme 139: BRAKELIGHT SWITCH (BTSI SOLENOID)
Scheme 139: BRAKELIGHT SWITCH (BTSI SOLENOID)

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 GENERAL INFORMATION.

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.

Bonneville, DeVille, Impala, Le Sabre, Monte Carlo & Park Avenue

Pull tab out on block side of electrical BTSI solenoid. Shift column into Neutral. Press on adjuster block to compress internal adjuster spring to disengage adjuster teeth. Slide adjuster block as far away from solenoid as possible. (Scheme 140) Shift column into Park. Lock tab in place. Readjust if needed.

Scheme 140

Scheme 140: Bonneville, DeVille, Impala, Le Sabre, Monte Carlo & Park Avenue
Scheme 140: Bonneville, DeVille, Impala, Le Sabre, Monte Carlo & Park Avenue

"J" Bodies

  1. Remove steering wheel. See appropriate STEERING COLUMN SWITCHES article in ACCESSORIES & EQUIPMENT. Remove steering wheel covers. Ensure that locking tab of park lock cable end fully attaches to column housing. Assemble cable as needed. Replace cable if locking tab is damaged.
  2. Remove console. Place gearshift lever into Park. Move locking button on gearshift lever end of park cable adjuster to unlock. Turn ignition key to RUN position. Do not start engine. Verify that instrument panel lights illuminate. Fully compress adjuster body spring. Release adjuster body spring. Move locking button on gearshift lever end of park lock cable adjuster body to lock. Turn ignition key to OFF-LOCK position. Readjust if needed.

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.

Note. Lock cylinder must be in RUN position when park lock cable is removed from or inserted into ignition switch inhibitor.

"E" & "K" Bodies (Column Shift)

Turn lock cylinder to RUN position and depress brake pedal. Move gearshift lever out of Park position. Disengage locking button and pull cable away from solenoid until cable fitting starts to extend, compressing spring inside ball joint. Allow cable to move back.04-.08" (1.0-2.0 mm), then engage locking button. (Scheme 141) Recheck BTSI system. If system does not operate as specified, repeat procedure.

"E" & "K" Bodies (Floor Shift)

  1. Disconnect negative battery cable. Remove center console trim for access to base of gearshift lever. Place gearshift lever in Park position. Turn lock cylinder to RUN position to energize BTSI solenoid. Unlock cable adjuster at base of gearshift lever by pressing locking button upward. Turn lock cylinder to LOCK position.
  2. Push cable housing toward gearshift lever to remove slack. With no load applied to cable, lock cable adjuster button by pressing locking button down. Install center console trim. Connect negative battery cable. Recheck BTSI system. If system does not operate as specified, repeat previous step.

Scheme 141

Scheme 141
Scheme 141

"C", "F", "H", "K" & "W" Bodies (Except Intrigue & Seville)

Use gearshift lever to put column in Park position. Turn ignition switch to OFF-LOCK position. Unlock adjuster ring on park lock cable assembly with Adjuster Ring Lock Pliers (J-41396). (Scheme 142) Pull on cable until park lock latch contacts gearshift lever. Release cable. Lock adjuster ring securely in place on park lock cable assembly with adjuster ring lock pliers. If system does not operate as specified, repeat adjustment procedure.

Scheme 142

Scheme 142: "C", "F", "H", "K" & "W" Bodies (Except Intrigue & Seville)
Scheme 142: "C", "F", "H", "K" & "W" Bodies (Except Intrigue & Seville)

"J" Body (Column Shift)

Turn lock cylinder to RUN position. Place gearshift lever in Park position. Unlock park lock cable locking tab at linear shift base adapter. (Scheme 143) Push and hold cable housing toward gearshift lever. Turn lock cylinder to OFF-LOCK position and pull key halfway out. Release cable housing and allow park lock cable to balance out. Lock cable locking tab. If system does not operate as specified, repeat adjustment procedure.

Note. Ensure park lock cable locking tab is fully seated into ignition cylinder lock housing. Replace cable if lock tab is damaged.

"J" Body (Floor Shift)

Remove console. Place gearshift lever in Park position. Unlock park lock cable adjuster at base of gearshift lever. (Scheme 144) Turn lock cylinder to RUN position to energize BTSI solenoid. Compress adjuster body fully and release to ensure BTSI solenoid is fully activated. Lock park lock cable adjuster. Turn lock cylinder to OFF-LOCK position. Recheck BTSI system. If system does not operate as specified, repeat adjustment procedure.

Scheme 143

Scheme 143: "J" Body (Floor Shift)
Scheme 143: "J" Body (Floor Shift)

Scheme 144

Scheme 144
Scheme 144

Scheme 145

Scheme 145: "M" Body (Metro & Firefly (Canadian))
Scheme 145: "M" Body (Metro & Firefly (Canadian))
  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 145) 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.
  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 146

Scheme 146: "W" Body (Intrigue)
Scheme 146: "W" Body (Intrigue)
  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 146)
  2. Disconnect park lock cable from console shift control. Open lock on adjuster body by prying up with a flat-bladed screwdriver. (Scheme 146) 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.

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 GENERAL INFORMATION.

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

Park Lock System Wiring Diagram (Regal). Scheme 147

Scheme 147: Park Lock System Wiring Diagram (Regal)
Scheme 147: Park Lock System Wiring Diagram (Regal)
Fig. 30: Shift Interlock System Wiring Diagram (Alero & Grand Am)
Scheme 30: Shift Interlock System Wiring Diagram (Alero & Grand Am)
Fig. 31: Shift Interlock System Wiring Diagram (Bonneville & LeSabre)
Scheme 31: Shift Interlock System Wiring Diagram (Bonneville & LeSabre)
Fig. 32: Shift Interlock System Wiring Diagram (Camaro & Firebird)
Scheme 32: Shift Interlock System Wiring Diagram (Camaro & Firebird)
Fig. 33: Shift Interlock System Wiring Diagram (Catera)
Scheme 33: Shift Interlock System Wiring Diagram (Catera)
Fig. 34: Shift Interlock System Wiring Diagram (Cavalier & Sunfire)
Scheme 34: Shift Interlock System Wiring Diagram (Cavalier & Sunfire)
Fig. 35: Shift Interlock System Wiring Diagram (Century & Regal)
Scheme 35: Shift Interlock System Wiring Diagram (Century & Regal)
Fig. 36: Shift Interlock System Wiring Diagram (Corvette)
Scheme 36: Shift Interlock System Wiring Diagram (Corvette)
Fig. 37: Shift Interlock System Wiring Diagram (Deville - With Column Shift)
Scheme 37: Shift Interlock System Wiring Diagram (Deville - With Column Shift)
Fig. 38: Shift Interlock System Wiring Diagram (Deville - With Console Shift)
Scheme 38: Shift Interlock System Wiring Diagram (Deville - With Console Shift)
Fig. 39: Shift Interlock System Wiring Diagram (Eldorado)
Scheme 39: Shift Interlock System Wiring Diagram (Eldorado)
Fig. 40: Shift Interlock System Wiring Diagram (Grand Prix)
Scheme 40: Shift Interlock System Wiring Diagram (Grand Prix)
Fig. 41: Shift Interlock System Wiring Diagram (Impala)
Scheme 41: Shift Interlock System Wiring Diagram (Impala)
Fig. 42: Shift Interlock System Wiring Diagram (Intrigue)
Scheme 42: Shift Interlock System Wiring Diagram (Intrigue)
Fig. 43: Shift Interlock System Wiring Diagram (Lumina)
Scheme 43: Shift Interlock System Wiring Diagram (Lumina)
Fig. 44: Shift Interlock System Wiring Diagram (Malibu)
Scheme 44: Shift Interlock System Wiring Diagram (Malibu)
Fig. 45: Shift Interlock System Wiring Diagram (Metro & Firefly (Canadian))
Scheme 45: Shift Interlock System Wiring Diagram (Metro & Firefly (Canadian))
Fig. 46: Shift Interlock System Wiring Diagram (Monte Carlo)
Scheme 46: Shift Interlock System Wiring Diagram (Monte Carlo)
Fig. 47: Shift Interlock System Wiring Diagram (Park Avenue)
Scheme 47: Shift Interlock System Wiring Diagram (Park Avenue)
Fig. 48: Shift Interlock System Wiring Diagram (Prizm)
Scheme 48: Shift Interlock System Wiring Diagram (Prizm)
Fig. 49: Shift Interlock System Wiring Diagram (Saturn LS, LS1 & LW1)
Scheme 49: Shift Interlock System Wiring Diagram (Saturn LS, LS1 & LW1)
Fig. 50: Shift Interlock System Wiring Diagram (Saturn LS2 & LW2)
Scheme 50: Shift Interlock System Wiring Diagram (Saturn LS2 & LW2)
Fig. 51: Shift Interlock System Wiring Diagram (Seville)
Scheme 51: Shift Interlock System Wiring Diagram (Seville)

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