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Home/Lincoln/LS/Lincoln LS I (1999-2002)/Repair manual/Automatic Trans/Shift Interlock System: Other
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Shift Interlock System: Other Lincoln LS I

Automatic Trans 8 illustrations ~12591 words

ALL MODELS

Shift interlock system is a 2-function electro/mechanical system which prevents free movement of gearshift lever. On models with column shift, a shift lock actuator is mounted on the steering column. On models with floor mounted gearshift lever, a shift lock actuator is mounted on ignition switch end of interlock cable. This actuator prevents ignition switch from being turned to LOCK position unless gearshift lever is in "P" position. Gearshift lever may not be moved from "P" position if ignition key is in RUN position unless brake pedal is depressed.

On Escort, Escort ZX2, Lincoln LS and Villager, a cable system between ignition switch and gearshift lever prevents ignition key from being removed from switch unless gearshift lever is in "P" position. It also prevents gearshift lever from being moved from "P" position when ignition switch is in LOCK position.

An electronic shift lock actuator, mounted at base of gearshift lever, locks gearshift lever in "P" position until ignition switch is in RUN position and brake pedal is depressed.

EMERGENCY OVERRIDE FUNCTION

Note. On models not listed, emergency override function can be performed by turning ignition switch to 1st position from OFF towards ON position. Apply brake pedal and attempt to move gearshift lever.

Contour, Cougar & Mystique

Ensure gearshift lever is locked in Park. Use a screwdriver or similar item as an unlocking lever and push backward on actuator and hold in position. (Scheme 50) If gearshift lever is moved back into "P" position, it will re-lock.

Scheme 50

Scheme 50: Contour, Cougar & Mystique
Scheme 50: Contour, Cougar & Mystique

Escort, Escort ZX2 & Focus

Ensure gearshift lever is locked in Park. Use a screwdriver to lift small access cover at upper right corner of shift bezel. Insert a screwdriver vertically into access hole and push downward to release lock lever. Ensure gearshift lever is released from Park.

ALL MODELS (EXCEPT ESCORT, ESCORT ZX2 & VILLAGER)

Turn ignition switch to RUN position. Ensure gearshift lever is in "P" position. Ensure gearshift lever may only be moved to "R" position when brake pedal is depressed. Ensure ignition switch cannot be turned to LOCK position with gearshift lever in "R" position. Move gearshift lever to "P" position and ensure ignition switch may be turned to LOCK position and key removed.

Mechanical Components

Verify customer complaint. Visually inspect the following mechanical components of the shift lock system

  1. Gearshift lever assembly for damage or misadjustment.
  2. Ignition switch/interlock cable for damage or misadjustment.
  3. Switches and brackets for damaged.

Electrical Components

Verify customer complaint. Visually inspect the following electrical components of the shift lock system

  1. Fuse No. 28 (10-amp) or fuse No. 32 (15-amp).
  2. Loose or damaged connections.
  3. Brake Pedal Position (BPP) switch connections.
  4. Failed wiring harness or fuse junction box.

Note. See appropriate wiring diagram to diagnose electrical circuits and identify fuses and circuit numbers. See WIRING DIAGRAMS .

  1. Check Brakelight Operation Apply brake pedal. If brakelights illuminate, go to step 7 . If brakelights do not illuminate, go to next step.
  2. Check Fuse No. 32 (15-Amp) Check fuse No. 32 located in the interior fuse panel. See «WIRING DIAGRAMS»(ref-12238-S31567644982000121500000) . If fuse is okay, go to step 4 . If fuse is blown, go to next step.
  3. Check VPWR Circuit (Light Green/Red Wire) To BPP Switch For Short To Ground Turn ignition switch to OFF position. Disconnect BPP switch harness connector. Using DVOM, measure resistance of Light Green/Red wire between BPP switch harness connector terminal and ground. If resistance is more than 10 k/ohms, go to next step. If resistance is 10 k/ohms or less, repair short to ground in Light Green/Red wire between fuse panel and BPP switch. Retest system.
  4. Check VPWR Circuit (Light Green/Red Wire) To BPP Switch For Open Using DVOM, measure resistance of Light Green/Red wire between fuse No. 32 output terminal and BPP switch harness connector terminal. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Light Green/Red wire between fuse panel and BPP switch. Retest system.
  5. Check BPP Switch Using DVOM, measure resistance between both BPP switch terminals. Apply brakes and recheck resistance. Resistance should be more than 10 k/ohms without brake pedal applied and less than 5 ohms with brake pedal applied. If resistance is as specified, go to next step. If resistance is not as specified, replace BPP switch and retest system.
  6. Check Light Green Wire To Shift Interlock Actuator For Short To Ground Disconnect shift lock actuator connector. Using DVOM, measure resistance of Light Green wire between shift lock actuator harness connector terminal and ground. If resistance is more than 10 k/ohms, go to next step. If resistance is 10 k/ohms or less, repair short in Light Green wire between BPP switch harness connector and shift lock actuator. Retest system.
  7. Check Light Green Wire To Shift Interlock Actuator For Open Using DVOM, measure resistance of Light Green wire between BPP switch harness connector and shift lock actuator harness connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Light Green wire between BPP switch and shift lock actuator. Retest system.
  8. Check Light Green Wire To Shift Interlock Actuator For Voltage Turn ignition switch to ON position. Using DVOM, measure voltage between shift lock actuator harness connector terminal (Violet/Orange wire) and ground. If battery voltage is present, go to step 12 . If battery voltage is not present, go to next step.
  9. Check Fuse No. 28 (10-Amp) Turn ignition switch to OFF position. Remove and check fuse No. 28. See «WIRING DIAGRAMS»(ref-12238-S31567644982000121500000) . If fuse is okay, go to step 11 . If fuse is blown, go to next step.
  10. Check Violet/Orange Wire To Shift Interlock Actuator For Short To Ground Using DVOM, measure resistance between shift lock actuator harness connector terminal (Violet/Orange wire) and ground. If resistance is more than 10 k/ohms, go to next step. If resistance is 10 k/ohms or less, repair open in Violet/Orange wire between fuse No. 28 and shift lock actuator harness connector. See «WIRING DIAGRAMS»(ref-12238-S31567644982000121500000) . Reconnect all connectors and retest system.
  11. Check Violet/Orange Wire To Shift Interlock Actuator For Open Using DVOM, measure resistance between fuse No. 28 output terminal (Light Green/Violet wire) and shift lock actuator harness connector terminal (Violet/Orange wire). See «WIRING DIAGRAMS»(ref-12238-S31567644982000121500000) . If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in affected circuit between fuse No. 28 and shift lock actuator harness connector. Retest system.
  12. Check Black Wire To Shift Interlock Actuator For Open Ensure ignition switch is turned to OFF position. Using DVOM, measure resistance of Black wire between shift lock actuator harness connector and ground. If resistance is less than 5 ohms, replace shift lock actuator. Retest system. If resistance is 5 ohms or more, repair open in Black wire between shift lock actuator connector and ground. Retest system.

Verify customer complaint. Visually inspect the following mechanical of the shift lock system

  1. Gearshift lever assembly for damage or misadjustment.
  2. Ignition switch for damage or misadjustment.

Verify customer complaint. Visually inspect the following electrical components of the shift lock system

  1. Open or shorted circuits.
  2. Loose or damaged connections.
  3. Brake Pedal Position (BPP) switch connections.
  4. Fuse No. 23 (15-amp) or fuses No. 30 and 34 (7.5-amp).
  5. Faulty instrument interface module.
  6. Faulty key removal inhibit solenoid.
  7. Faulty bulbs.

Note. See appropriate wiring diagram to diagnose electrical circuits and identify fuses and circuit numbers. See WIRING DIAGRAMS .

  1. Check Fuse No. 23 (15-Amp) Ensure ignition switch is turned to OFF position. Check fuse No. 23 (15-amp), located in central junction box. If fuse is okay, go to next step. If fuse is blown, replace fuse and recheck operation. If fuse blows again, check VPWR circuit (Green/Blue and Green/White wires) to park lock solenoid, or park lock solenoid for short to ground. See «WIRING DIAGRAMS»(ref-12238-S31567644982000121500000). Repair as necessary. Retest system.
  2. Check Fuse No. 34 (7.5-Amp) Check fuse No. 34 (7.5-amp), located in central junction box. If fuse is okay, go to next step. If fuse is blown, replace fuse. Attempt to move gearshift lever out of "P" position. If fuse blows again, check Orange/Yellow wire for short to ground. See «WIRING DIAGRAMS»(ref-12238-S31567644982000121500000). Repair as necessary. Retest system.
  3. Check Fuse No. 30 (7.5-Amp) Check fuse No. 30 (7.5-amp), located in central junction box. If fuse is okay, go to next step. If fuse is blown, replace fuse and recheck operation. If fuse blows again, check VPWR circuit (Green/Yellow or Green//Black wires) to overdrive cancel switch in gearshift lever unit for short to ground. Repair as necessary. Retest system.
  4. Check VPWR Circuits To Gearshift Lever Unit For Voltage Remove gearshift lever unit and disconnect electrical connector. Turn ignition switch to ON position. Using DVOM, measure voltage between chassis ground and gearshift lever unit wiring harness connector terminals No. 1 (Green/White wire) and 3 (Orange/Yellow wire). (Scheme 51) If both voltage measurements are more than 10 volts, go to next step. If either voltage measurement is 10 volts or less, repair open in affected wire between central junction box and gearshift lever unit.
  5. Check Signal Circuit (Black/White Wire) To Gearshift Lever Unit For Open Turn ignition switch to OFF position. Disconnect instrument interface module 16-pin connector, located below center console. Using DVOM, measure resistance of Black/White wire between gearshift lever unit wiring harness connector terminal No. 2 and instrument interface module harness connector terminal No. 8. (Scheme 51)and (Scheme 52). If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Black/White wire. Reconnect all connectors and retest system.
  6. Check Signal Circuit (Orange/Yellow Wire) To Gearshift Lever Unit For Open Using DVOM, measure resistance between gearshift lever unit harness connector terminal No. 4 (Orange/Yellow wire) and instrument interface module harness connector terminal No. 9 (Orange/Blue wire). (Scheme 51)and (Scheme 52). If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in affected wire. Reconnect all connectors and retest system.
  7. Check Signal Circuit (Black/White Wire) To Gearshift Lever Unit For Short To Power Turn ignition switch to ON position. Using DVOM, measure voltage between chassis ground and gearshift lever unit harness connector terminal No. 2 (Black/White wire). (Scheme 51) If voltage is less than one volt, go to next step. If voltage is one volt or more, repair short to power in Black/White wire. Retest system.
  8. Check Gearshift Lever Unit Operation Turn ignition switch to OFF position. Reconnect gearshift lever unit connector. Connect a jumper wire between chassis ground and instrument interface module harness connector terminal No. 8 (Black/White wire). Turn ignition switch to ON position. Attempt to move gearshift lever from "P" to "R" position. If gearshift lever moves, go to next step. If gearshift lever will not move, replace gearshift lever unit. Remove jumper wire, reconnect all connectors and retest system.
  9. Check Ground Circuit To Instrument Interface Module For Open Using DVOM, measure resistance between chassis ground and instrument interface module harness connector terminal No. 15 (Black/Green wire). If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in affected circuit. See «WIRING DIAGRAMS»(ref-12238-S31567644982000121500000). Retest system.
  10. Check VPWR Circuit (Green/Black Wire) To Instrument Interface Module For Open Turn ignition switch to ON position. Using DVOM, measure voltage between chassis ground and instrument interface module connector terminal No. 11 (Green/Black wire). If voltage is more than 10 volts, go to next step. If voltage is 10 volts or less, repair open in Green/Black wire between fuse No. 30 (7.5-amp) and instrument interface module. Reconnect all connectors and retest system.
  11. Check BPP Switch Operation Turn ignition switch to OFF position. Apply brake pedal. If brakelights illuminate, go to next step. If brakelights do not illuminate, diagnose faulty BPP switch. See EXTERIOR LIGHTS article in ACCESSORIES & EQUIPMENT.
  12. Check BPP Switch Signal Circuit (Orange/Black Wire) For Open Disconnect PCM 104-pin connector. Install 104-pin breakout box leaving PCM disconnected. Using DVOM, measure resistance between breakout box terminal No. 92 and instrument interface module harness connector terminal No. 7 (Orange/Black wire). If resistance is less than 5 ohms, replace instrument interface module. Retest system. If resistance is 5 ohms or more, repair open in affected circuit. See «WIRING DIAGRAMS»(ref-12238-S31567644982000121500000). Remove breakout box, reconnect all connectors and retest system.

Scheme 51

Scheme 51
Scheme 51

Scheme 52

Scheme 52
Scheme 52

Verify customer complaint. Visually inspect the following mechanical components of the shift lock system

  1. Shift lever assembly for damage or misadjustment.
  2. Ignition or Brake Pedal Position (BPP) switch for damage or misadjustment.

Verify customer complaint. Visually inspect the following electrical components of the shift lock system

  1. Open or shorted circuits.
  2. Loose or damaged connections.
  3. Brake Pedal Position (BPP) switch connections.
  4. Fuse No. 23 (15-amp) or fuses No. 30 and 34 (7.5-amp).
  5. Faulty interface module.
  6. Faulty key removal inhibit solenoid.
  7. Faulty bulbs.

Note. See appropriate wiring diagram to diagnose electrical circuits and identify fuses and circuit numbers. See WIRING DIAGRAMS .

  1. Check Fuse No. 23 (15-Amp) Check fuse No. 23 (15-amp), located in central junction box. If fuse is okay, go to next step. If fuse is blown, replace fuse and recheck operation. If fuse blows again, check VPWR circuit (Green/White wire and Green/Black wire) for short to ground. See «WIRING DIAGRAMS»(ref-12238-S31567644982000121500000). Repair as necessary.
  2. Check Fuse No. 34 (7.5-Amp) Check fuse No. 34 (7.5-amp), located in central junction box. If fuse is okay, go to next step. If fuse is blown, replace fuse and recheck operation. If fuse blows again, check Orange wire for short to ground. See «WIRING DIAGRAMS»(ref-12238-S31567644982000121500000). Repair as necessary.
  3. Check Fuse No. 30 (7.5-Amp) Check fuse No. 30 (7.5-amp), located in central junction box. If fuse is okay, go to next step. If fuse is blown, replace fuse and recheck operation. If fuse blows again, check Green/Black wire between fuse panel and gearshift lever unit for short to ground. See «WIRING DIAGRAMS»(ref-12238-S31567644982000121500000). Repair as necessary.
  4. Check VPWR Circuit To Gearshift Lever Unit For Voltage Remove gearshift lever unit and disconnect 8-pin connector. (Scheme 51) Turn ignition switch to ON position. Using DVOM, measure voltage between chassis ground and gearshift lever unit wiring harness connector terminals No. 1 (Green/Black wire) and 3 (Orange/Yellow wire). If both voltage measurements are more than 10 volts, go to next step. If either voltage measurement is 10 volts or less, repair open in affected wire between central junction box and gearshift lever unit. See «WIRING DIAGRAMS»(ref-12238-S31567644982000121500000).
  5. Check Signal Circuit (Black/White Wire) To Gearshift Lever Unit For Open Turn ignition switch to OFF position. Disconnect instrument interface module 16-pin connector, located below center console. Using DVOM, measure resistance of Black/White wire between gearshift lever unit harness connector terminal No. 2 and instrument interface module harness connector terminal No. 8. (Scheme 51)and (Scheme 52). If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Black/White wire. See «WIRING DIAGRAMS»(ref-12238-S31567644982000121500000). Retest system.
  6. Check Signal Circuit (Orange/Yellow Wire) To Gearshift Lever Unit For Open Ensure ignition switch is turned to OFF position. Using DVOM, measure resistance between gearshift lever unit harness connector terminal No. 4 (Orange/Yellow wire) and instrument interface module harness connector terminal No. 9 (Orange/Blue wire). (Scheme 51)and (Scheme 52). If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in affected wire. See «WIRING DIAGRAMS»(ref-12238-S31567644982000121500000). Reconnect all connectors and retest system.
  7. Check Signal Circuit (Black/White Wire) To Gearshift Lever Unit For Short To Power Turn ignition switch to ON position. Using DVOM, measure voltage between chassis ground and gearshift lever unit wiring harness connector terminal No. 2 (Black/White wire). (Scheme 51) If voltage is less than one volt, go to next step. If voltage is one volt or more, repair short to power in Black/White wire. See «WIRING DIAGRAMS»(ref-12238-S31567644982000121500000). Reconnect all connectors and retest system.
  8. Check Gearshift Lever Unit Operation Turn ignition switch to OFF position. Reconnect gearshift lever unit harness connector. Connect a jumper wire between chassis ground and instrument interface module harness connector terminal No. 8 (Black/White wire). Turn ignition switch to ON position. Attempt to move gearshift lever from "P" to "R" position. If gearshift lever moves, go to next step. If gearshift lever will not move, replace gearshift lever unit. Remove jumper wire and reconnect all connectors and retest system.
  9. Check Ground Circuit (Black/Green Wire) To Instrument Interface Module For Open Turn ignition switch to OFF position. Using DVOM, measure resistance between chassis ground and instrument interface module harness connector terminal No. 15 (Black/Green wire). If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in affected wire. See «WIRING DIAGRAMS»(ref-12238-S31567644982000121500000). Reconnect all connectors and retest system.
  10. Check VPWR Circuit (Green/Black Wire) To Instrument Interface Module For Open Turn ignition switch to ON position. Using DVOM, measure voltage between chassis ground and instrument interface module harness connector terminal No. 11 (Green/Black wire). If voltage is more than 10 volts, go to next step. If voltage is 10 volts or less, repair open in Green/Black wire. See «WIRING DIAGRAMS»(ref-12238-S31567644982000121500000). Reconnect all connectors and retest system.
  11. Check BPP Switch Operation Turn ignition switch to OFF position. Apply brake pedal. If brakelights illuminate, go to next step. If brakelights do not illuminate, diagnose BPP switch. See EXTERIOR LIGHTS article in ACCESSORIES & EQUIPMENT.
  12. Check BPP Switch Signal Circuit (Green/Black Wire) For Open Disconnect PCM 104-pin connector. Install 104-pin breakout box leaving PCM disconnected. Using DVOM, measure resistance between breakout box terminal No. 92 and instrument interface module connector terminal No. 7 (Green/Black wire). If resistance is less than 5 ohms, replace instrument interface module. Reconnect all connectors and retest system. If resistance is 5 ohms or more, repair open in affected wire. See «WIRING DIAGRAMS»(ref-12238-S31567644982000121500000). Remove breakout box, reconnect all connectors and retest system.

Verify customer complaint. Visually inspect the following mechanical components of the shift lock system

  1. Shift lever assembly and cable for damage or misadjustment.
  2. Ignition or Brake Pedal Position (BPP) switch for damage or misadjustment.

Verify customer complaint. Visually inspect the following electrical components of the shift lock system

  1. Open or shorted circuits.
  2. Loose or damaged connections.
  3. Brake Pedal Position (BPP) switch connections.
  4. Damaged shift lock actuator.
  5. Fuse(s) No. 1 or No. 5 (15-amp).

Note. See appropriate wiring diagram to diagnose electrical circuits and identify fuses and circuit numbers. See WIRING DIAGRAMS .

  1. Check BPP Switch Operation Turn ignition switch to ON position. Apply brake pedal. If brakelights illuminate, go to step 7 . If brakelights do not illuminate, go to next step.
  2. Check Fuse No. 1 (15-Amp) Check fuse No. 1 (15-amp), located in central junction box. If fuse is okay, go to step 4 . If fuse is blown, go to next step.
  3. Check Circuit For Short To Ground Turn ignition switch to OFF position. Remove fuse No. 1. Disconnect BPP switch harness connector. Using DVOM, measure resistance between chassis ground and BPP switch harness connector terminal (Light Green/Red wire). If resistance is more than 10 k/ohms, reinstall fuse and go to next step. If resistance is 10 k/ohms or less, repair short to ground in Light Green/Red wire. See «WIRING DIAGRAMS»(ref-12238-S31567644982000121500000) . Reconnect all connectors and retest system.
  4. Check Circuit For Open Using DVOM, measure resistance between output side of fuse No. 1 (15-amp) and BPP switch harness connector terminal (Light Green/Red wire). If resistance is 5 ohms or less, go to next step. If resistance is more than 5 ohms, repair open in Light Green/Red wire. See «WIRING DIAGRAMS»(ref-12238-S31567644982000121500000) . Reconnect all connectors and retest system.
  5. Check BPP Switch Disconnect BPP switch harness connector. Using DVOM, measure resistance between BPP switch terminals while open (OFF) and closed (ON). Resistance should be more than 10 k/ohms while open (OFF) and 5 ohms or less while closed (ON). If resistance is as specified, go to next step. If resistance is not as specified, replace BPP switch. Reconnect all connectors and retest system.
  6. Check Circuit No. 511 (Light Green Wire) For Short To Ground Disconnect shift lock actuator 3-pin connector. Using DVOM, measure resistance between chassis ground and shift lock actuator harness connector terminal No. 1 (Light Green wire). If resistance is more than 10 k/ohms, go to next step. If resistance is 10 k/ohms or less, repair short to ground in Light Green wire between BPP switch and shift lock actuator. See «WIRING DIAGRAMS»(ref-12238-S31567644982000121500000) . Reconnect all connectors and retest system.
  7. Check Circuit No. 511 (Light Green Wire) For Open Using DVOM, measure resistance between shift lock actuator harness connector terminal No. 1 (Light Green wire) and BPP switch harness connector terminal No. 2 (Light Green wire). If resistance is 5 ohms or less, go to next step. If resistance is more than 5 ohms, repair open in Light Green wire between shift lock actuator and BPP switch. See «WIRING DIAGRAMS»(ref-12238-S31567644982000121500000) . Reconnect all connectors and retest system.
  8. Check VPWR Circuit (Violet/Orange Wire) To Shift Lock Actuator Turn ignition switch to ON position. Using DVOM, measure voltage between chassis ground and shift lock actuator harness connector terminal No. 3 (Violet/Orange wire). If battery voltage is not present, go to next step. If battery voltage is present, go to step 12 .
  9. Check Fuse No. 5 (15-Amp) Check fuse No. 5 (15-amp), located in central junction box. If fuse is blown, go to next step. If fuse is okay, go to step 11 .
  10. Check VPWR Circuit (Violet/Orange Wire) For Short To Ground Ensure ignition switch is turned to OFF position. Using DVOM, measure resistance between chassis ground and shift lock actuator harness connector terminal No. 3 (Violet/Orange wire). If resistance is more than 10 k/ohms, go to next step. If resistance is 10 k/ohms or less, repair short to ground in Violet/Orange wire between shift lock actuator and fuse No. 5. See «WIRING DIAGRAMS»(ref-12238-S31567644982000121500000) . Reconnect all connectors and retest system.
  11. Check VPWR Circuit (Violet/Orange Wire) For Open Using DVOM, measure resistance between output side of fuse No. 5 (15-amp) and shift lock actuator harness connector terminal No. 3 (Violet/Orange wire). If resistance is 5 ohms or less, go to next step. If resistance is more than 5 ohms, repair open in Violet/Orange wire. See «WIRING DIAGRAMS»(ref-12238-S31567644982000121500000) . Reconnect all connectors and retest system.
  12. Check Ground Circuit (Black Wire) To Shift Lock Actuator For Open Using DVOM, measure resistance between chassis ground and shift lock actuator harness connector terminal No. 2 (Black wire). If resistance is 5 ohms or less, replace shift lock actuator. If resistance is more than 5 ohms, repair open in Black wire. See «WIRING DIAGRAMS»(ref-12238-S31567644982000121500000) . Reconnect all connectors and retest system.

Verify customer complaint. Visually inspect the following mechanical components of the shift lock system

  1. Shift lever or lock actuator assembly for damage or misadjustment.
  2. Ignition switch for damage or misadjustment.
  3. Switches and brackets for damaged.

Verify customer complaint. Visually inspect the following electrical components of the shift lock system

  1. Fuse No. 6 (10-amp) or fuse No. 11 (15-amp).
  2. Loose or damaged connections.
  3. Brake Pedal Position (BPP) switch connections.
  4. Wiring harness.

Note. See appropriate wiring diagram to diagnose electrical circuits and identify fuses and circuit numbers. See WIRING DIAGRAMS .

  1. Check Brakelight Operation Apply brake pedal. If brakelights illuminate, go to step 7 . If brakelights do not illuminate, go to next step.
  2. Check Fuse No. 11 (15-Amp) Check fuse No. 11 (15-amp), in central junction box. See «WIRING DIAGRAMS»(ref-12238-S31567644982000121500000) . If fuse is okay, go to step 4 . If fuse is blown, go to next step.
  3. Check VPWR Circuit (Light Green/Red Wire) To BPP Switch For Short To Ground Turn ignition switch to OFF position. Disconnect BPP switch harness connector. Ensure fuse No. 11 (15-amp) is still removed from central junction box. Using DVOM, measure resistance between chassis ground and BPP switch harness connector terminal No. 1 (Light Green/Red wire). If resistance is more than 10 k/ohms, go to next step. If resistance is 10 k/ohms or less, repair short to ground in Light Green/Red wire between fuse No. 11 and BPP switch. See «WIRING DIAGRAMS»(ref-12238-S31567644982000121500000) . Reconnect all connectors and retest system.
  4. Check VPWR Circuit (Light Green/Red Wire) For Open Using DVOM, measure resistance between fuse No. 11 output side terminal and BPP switch harness connector terminal No. 1 (Light Green/Red wire). If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Light Green/Red wire between fuse No. 11 and BPP switch. See «WIRING DIAGRAMS»(ref-12238-S31567644982000121500000) . Reconnect all connectors and retest system.
  5. Check BPP Switch Disconnect BPP switch harness connector. Using DVOM, measure resistance between BPP switch terminals while open (OFF) and closed (ON). Resistance should be more than 10 k/ohms while open (OFF) and 5 ohms or less while closed (ON). If resistance is as specified, go to next step. If resistance is not as specified, replace BPP switch. Reconnect all connectors and retest system.
  6. Check VPWR Circuit (Light Green Wire) From BPP Switch For Short To Ground Disconnect shift lock actuator 3-pin connector. Using DVOM, measure resistance between chassis ground and shift lock actuator harness connector terminal No. 1 (Light Green wire). If resistance is more than 10 k/ohms, go to next step. If resistance is 10 k/ohms or less, repair short to ground in Light Green wire between BPP switch harness connector and shift lock actuator connector. See «WIRING DIAGRAMS»(ref-12238-S31567644982000121500000) . Reconnect all connectors and retest system.
  7. Check VPWR Circuit (Light Green Wire) For Open Using DVOM, measure resistance between BPP switch harness connector terminal No. 2 (Light/Green wire) and shift lock actuator harness connector terminal No. 1 (Light/Green wire). If resistance is 5 ohms or less, go to next step. If resistance is more than 5 ohms, repair open in Light Green wire between BPP switch harness connector and shift lock actuator connector. See «WIRING DIAGRAMS»(ref-12238-S31567644982000121500000) . Reconnect all connectors and retest system.
  8. Check VPWR Circuit (Purple/Orange Wire) To Shift Interlock Actuator Turn ignition switch to ON position. Using DVOM, measure voltage between chassis ground and shift lock actuator harness connector terminal No. 3 (Purple/Orange wire). If battery voltage is not present, go to next step. If battery voltage is present, go to step 12 .
  9. Check Fuse No. 6 (10-Amp) Turn ignition switch to OFF position. Remove and check fuse No. 6 (10-amp). See «WIRING DIAGRAMS»(ref-12238-S31567644982000121500000) . If fuse is blown, go to next step. If fuse is okay, go to step 11 .
  10. Check VPWR Circuit (Purple/Orange Wire) For Short To Ground Using DVOM, measure resistance between chassis ground and shift lock actuator harness connector terminal No. 3 (Purple/Orange wire). If resistance is more than 10 k/ohms, go to next step. If resistance is 10 k/ohms or less, repair open in Purple/Orange wire between fuse No. 6 and shift lock actuator connector. See «WIRING DIAGRAMS»(ref-12238-S31567644982000121500000) . Reconnect all connectors and retest system.
  11. Check VPWR Circuit (Purple/Orange Wire) For Open Using DVOM, measure resistance between fuse No. 6 output terminal and shift lock actuator harness connector terminal No. 3 (Purple/Orange wire). If resistance is 5 ohms or less, go to next step. If resistance is more than 5 ohms, repair open in Purple/Orange wire between fuse No. 6 and shift lock actuator connector. See «WIRING DIAGRAMS»(ref-12238-S31567644982000121500000) . Reconnect all connectors and retest system.
  12. Check Ground Circuit (Black Wire) To Shift Lock Actuator For Open Using DVOM, measure resistance between chassis ground and shift lock actuator harness connector terminal No. 2 (Black wire). If resistance is 5 ohms or less, replace shift lock actuator. Reconnect all connectors and retest system. If resistance is more than 5 ohms, repair open in Black wire between shift lock actuator connector and ground. See «WIRING DIAGRAMS»(ref-12238-S31567644982000121500000) . Reconnect all connectors and retest system.

Verify customer complaint. Visually inspect the following mechanical components of the shift lock system

  1. Shift lever assembly for damage or misadjustment.
  2. Ignition or Brake Pedal Position (BPP) switches for damage or misadjustment.
  3. Switches and brackets for damaged.

Verify customer complaint. Visually inspect the following electrical components of the shift lock system

  1. METER and ROOM fuses (10-amp) or STOP fuse (15-amp) on Escort Sedan.
  2. METER (10-amp), HORN (15-amp) or STOP fuse (20-amp) on Escort Coupe.
  3. Loose or damaged connections.
  4. Brake Pedal Position (BPP) switch connections.
  5. Faulty park sense switch.
  6. Wiring harness.

Note. See appropriate wiring diagram to diagnose electrical circuits and identify fuses and circuit numbers. See WIRING DIAGRAMS .

  1. Check Fuse(s) Check METER, ROOM and STOP fuses (on Sedan models) or METER, STOP and HORN fuses (on Coupe models), located in central junction box. If fuses are okay, go to next step. If fuses are blown, replace faulty fuse and retest system. If fuse fails again, check for short to ground in affected circuit. See «WIRING DIAGRAMS»(ref-12238-S31567644982000121500000) . Repair as necessary and retest system.
  2. Check VPWR Circuits (Green/Yellow Wire & Black/Yellow Wire) To Shift Lock Actuator Turn ignition switch to OFF position. Disconnect shift lock actuator 4-pin connector. Turn ignition switch to ON position. Using DVOM, measure voltage between chassis ground and shift lock actuator harness connector terminals No. 4 (Green/Yellow wire) and No. 3 (Black/Yellow wire). See «WIRING DIAGRAMS»(ref-12238-S31567644982000121500000) . If voltage is more than 10 volts, go to next step. If voltage is 10 volts or less, repair open in affected wire. See «WIRING DIAGRAMS»(ref-12238-S31567644982000121500000) . Repair as necessary. Reconnect all connectors and retest system.
  3. Check VPWR Circuit From BPP Switch To Shift Lock Actuator Turn ignition switch to OFF position. Apply brake pedal and hold. Using DVOM, measure voltage between chassis ground and shift lock actuator harness connector terminal No. 1 (Green wire). If voltage is less than 10 volts, check for open circuit in Brake Pedal Position (BPP) switch, Green/White wire between BPP switch and STOP fuse, or Green wire between BPP switch and shift lock actuator. See «WIRING DIAGRAMS»(ref-12238-S31567644982000121500000) . If voltage is 10 volts or more, release brake pedal and go to next step.
  4. Check Ground Circuit (Black Wire) To Park Sense Switch For Open Disconnect park sense switch 2-pin connector. Using DVOM, measure resistance between chassis ground and park sense switch harness connector terminal No. 2 (Black wire). If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Black wire. See «WIRING DIAGRAMS»(ref-12238-S31567644982000121500000) . Reconnect all connectors and retest system.
  5. Check Park Sense Switch Using DVOM, measure resistance between park sense switch connector terminals. Resistance should be less than 5 ohms with park sense switch button released and more than 10 k/ohms with park sense switch button pressed or gearshift lever in any position other than "P" position. If resistance is not as specified, replace gearshift lever and park sense switch. Reconnect all connectors and retest system. If resistance is as specified, replace shift lock actuator. Reconnect all connectors and retest system.

Verify customer complaint. Visually inspect the following mechanical components of the shift lock system

  1. Shift lever assembly for damage or misadjustment.
  2. Ignition or Brake Pedal Position (BPP) switch for damage or misadjustment.

Verify customer complaint. Visually inspect the following electrical components of the shift lock system

  1. Fuse No. 15 (5-amp), fuse No. 6 (15-amp) on Excursion, or fuse No. 28 (10-amp) on all other models.
  2. Loose or damaged connections.
  3. Brake Pedal Position (BPP) switch connections.
  4. Wiring harness.

Note. See appropriate wiring diagram to diagnose electrical circuits and identify fuses and circuit numbers. See WIRING DIAGRAMS .

  1. Check Fuse No. 15 (5-Amp) Remove and check fuse No. 15 (5-amp), located in central junction box. See «WIRING DIAGRAMS»(ref-12238-S31567644982000121500000). If fuse is blown, go to next step. If fuse is okay, go to step 3.
  2. Check VPWR Circuit (Light Blue/Black Wire) To BPP Switch For Short To Ground Ensure fuse No. 15 (5-amp) is removed from central junction box. Turn ignition switch to OFF position. Disconnect BPP switch harness connector. Using DVOM, measure resistance between chassis ground and BPP switch harness connector terminal No. 3 (Light Blue/Black wire). (Scheme 53) If resistance is more 10 k/ohms, go to next step. If resistance is 10 k/ohms or less, repair short to ground in Light Blue/Black wire between fuse No. 15 and BPP switch. See «WIRING DIAGRAMS»(ref-12238-S31567644982000121500000). Reconnect all connectors and retest system.
  3. Check VPWR Circuit (Light Blue/Black Wire) To BPP Switch For Open Using DVOM, measure resistance between fuse No. 15 (5-amp) output terminal and BPP switch harness connector terminal No. 3 (Light Blue/Black wire). (Scheme 53) If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Light Blue/Black wire between fuse No. 15 and BPP switch. See «WIRING DIAGRAMS»(ref-12238-S31567644982000121500000). Reconnect all connectors and retest system.
  4. Check BPP Switch Apply brake pedal and hold. Using DVOM, measure and record resistance between BPP switch harness connector terminals No. 2 and 3. (Scheme 53) Resistance should be more than 10 k/ohms without brake pedal applied and less than 5 ohms with brake pedal applied. If switch resistance is as specified, go to next step. If switch resistance is not as specified, replace BPP switch and retest system.
  5. Check VPWR Circuit (Red/Light Green Wire) From BPP Switch For Short To Ground Disconnect shift lock actuator 3-pin connector. Using DVOM, measure resistance between chassis ground and shift lock actuator harness connector terminal No. 1 (Red/Light Green wire). If resistance is more than 10 k/ohms, go to next step. If resistance is 10 k/ohms or less, repair short to ground in Red/Light Green wire between BPP switch harness connector and shift lock actuator connector. See «WIRING DIAGRAMS»(ref-12238-S31567644982000121500000). Reconnect all connectors and retest system.
  6. Check VPWR Circuit (Red/Light Green Wire) From BPP Switch For Open Using DVOM, measure resistance of Red/Light Green wire between BPP switch harness connector terminal No. 2 and shift lock actuator harness connector terminal No. 1. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Red/Light Green wire between BPP switch harness connector and shift lock actuator connector. See «WIRING DIAGRAMS»(ref-12238-S31567644982000121500000). Reconnect all connectors and retest system.
  7. Check VPWR Circuit (Light Blue/Pink Wire) To Shift Lock Actuator For Voltage Turn ignition switch to ON position. Using DVOM, measure voltage between chassis ground and shift lock actuator harness connector terminal No. 3 (Light Blue/Pink wire). If battery voltage is not present, go to next step. If battery voltage is present, go to step 11.
  8. Check Fuse No. 6 (15-Amp) On Excursion, Or Fuse No. 28 (10-Amp) On All Others Turn ignition switch to OFF position. Remove and check fuse No. 6 (Excursion) or No. 28 (all others). See «WIRING DIAGRAMS»(ref-12238-S31567644982000121500000). If fuse is blown, go to next step. If fuse is okay, go to step 10.
  9. Check VPWR Circuit (Light Blue/Pink Wire) To Shift Lock Actuator For Short To Ground Using DVOM, measure resistance between chassis ground and shift lock actuator harness connector terminal No. 3 (Light Blue/Pink wire). If resistance is more than 10 k/ohms, go to next step. If resistance is 10 k/ohms or less, repair short to ground in Light Blue/Pink wire between fuse and shift lock actuator connector. See «WIRING DIAGRAMS»(ref-12238-S31567644982000121500000). Reconnect all connectors and retest system.
  10. Check VPWR Circuit (Light Blue/Pink Wire) To Shift Lock Actuator For Open Using DVOM, measure resistance between fuse No. 6 (Excursion) or No. 28 (all others) output terminal and shift lock actuator harness connector terminal No. 3 (Light Blue/Pink wire). If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Light Blue/Pink wire between fuse and shift lock actuator connector. See «WIRING DIAGRAMS»(ref-12238-S31567644982000121500000). Reconnect all connectors and retest system.
  11. Check Ground Circuit (Black Wire) To Shift Lock Actuator For Open Using DVOM, measure resistance between chassis ground and shift lock actuator harness connector terminal No. 2 (Black wire). If resistance is 5 ohms or less, replace shift lock actuator. Reconnect all connectors and retest system. If resistance is more than 5 ohms, repair open in Black wire between shift lock actuator connector and ground. See «WIRING DIAGRAMS»(ref-12238-S31567644982000121500000). Reconnect all connectors and retest system.

Verify customer complaint. Visually inspect the following mechanical components of the shift lock system

  1. Shift lever assembly for damage or misadjustment.
  2. Ignition or Brake Pedal Position (BPP) switch for damage or misadjustment.

Verify customer complaint. Visually inspect the following electrical components of the shift lock system

  1. Fuses No. 6 and 15 (5-amp).
  2. Loose or damaged connections.
  3. Brake Pedal Position (BPP) switch connections.
  4. Wiring harness.

Note. See appropriate wiring diagram to diagnose electrical circuits and identify fuses and circuit numbers. See WIRING DIAGRAMS .

  1. Check Fuse No. 15 (5-Amp) Remove and check fuse No. 15 (5-amp), located in central junction box. See «WIRING DIAGRAMS»(ref-12238-S31567644982000121500000). If fuse is blown, go to next step. If fuse is okay, go to step 3.
  2. Check VPWR Circuit (White/Yellow Wire) To BPP Switch For Short To Ground Ensure fuse No. 15 (5-amp) is removed from central junction box. Turn ignition switch to OFF position. Disconnect BPP switch harness connector. Using DVOM, measure resistance between chassis ground and BPP switch harness connector terminal No. 3 (White/Yellow wire). (Scheme 53) If resistance is more 10 k/ohms, go to next step. If resistance is 10 k/ohms or less, repair short to ground in White/Yellow wire between fuse No. 15 and BPP switch. See «WIRING DIAGRAMS»(ref-12238-S31567644982000121500000). Reconnect all connectors and retest system.
  3. Check VPWR Circuit (White/Yellow Wire) To BPP Switch For Open Using DVOM, measure resistance between fuse No. 15 (5-amp) output terminal and BPP switch harness connector terminal No. 3 (White/Yellow wire). (Scheme 53) If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in White/Yellow wire between fuse No. 15 and BPP switch. See «WIRING DIAGRAMS»(ref-12238-S31567644982000121500000). Reconnect all connectors and retest system.
  4. Check BPP Switch Apply brake pedal and hold. Using DVOM, measure and record resistance between BPP switch harness connector terminals No. 2 and 3. (Scheme 53) Resistance should be more than 10 k/ohms without brake pedal applied and 5 ohms or less with brake pedal applied. If switch resistance is as specified, go to next step. If switch resistance is not as specified, replace BPP switch and retest system.
  5. Check VPWR Circuit (Red/Light Green Wire) From BPP Switch For Short To Ground Disconnect shift lock actuator 3-pin connector. Using DVOM, measure resistance between chassis ground and shift lock actuator harness connector terminal No. 1 (Red/Light Green wire). If resistance is more than 10 k/ohms, go to next step. If resistance is 10 k/ohms or less, repair short to ground in Red/Light Green wire between BPP switch harness connector and shift lock actuator connector. See «WIRING DIAGRAMS»(ref-12238-S31567644982000121500000). Reconnect all connectors and retest system.
  6. Check VPWR Circuit (Red/Light Green Wire) From BPP Switch For Open Using DVOM, measure resistance of Red/Light Green wire between BPP switch harness connector terminal No. 2 and shift lock actuator harness connector terminal No. 1. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Red/Light Green wire between BPP switch harness connector and shift lock actuator connector. See «WIRING DIAGRAMS»(ref-12238-S31567644982000121500000). Reconnect all connectors and retest system.
  7. Check VPWR Circuit (Gray/Yellow Wire) To Shift Lock Actuator For Voltage Turn ignition switch to ON position. Using DVOM, measure voltage between chassis ground and shift lock actuator harness connector terminal No. 3 (Gray/Yellow wire). If battery voltage is not present, go to next step. If battery voltage is present, go to step 11.
  8. Check Fuse No. 6 (5-Amp) Turn ignition switch to OFF position. Remove and check fuse No. 6. See «WIRING DIAGRAMS»(ref-12238-S31567644982000121500000). If fuse is blown, go to next step. If fuse is okay, go to step 10.
  9. Check VPWR Circuit (Gray/Yellow Wire) To Shift Lock Actuator For Short To Ground Using DVOM, measure resistance between chassis ground and shift lock actuator harness connector terminal No. 3 (Gray/Yellow wire). If resistance is more than 10 k/ohms, go to next step. If resistance is 10 k/ohms or less, repair short to ground in Gray/Yellow wire between fuse No. 6 (5-amp) and shift lock actuator connector. See «WIRING DIAGRAMS»(ref-12238-S31567644982000121500000). Reconnect all connectors and retest system.
  10. Check VPWR Circuit (Gray/Yellow Wire) To Shift Lock Actuator For Open Using DVOM, measure resistance between fuse No. 6 (5-amp) output terminal and shift lock actuator harness connector terminal No. 3 (Gray/Yellow wire). If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Gray/Yellow wire between fuse No. 6 (5-amp) and shift lock actuator connector. See «WIRING DIAGRAMS»(ref-12238-S31567644982000121500000). Reconnect all connectors and retest system.
  11. Check Ground Circuit (Black Wire) To Shift Lock Actuator For Open Using DVOM, measure resistance between chassis ground and shift lock actuator harness connector terminal No. 2 (Black wire). If resistance is 5 ohms or less, replace shift lock actuator. Reconnect all connectors and retest system. If resistance is more than 5 ohms, repair open in Black wire between shift lock actuator connector and ground. See «WIRING DIAGRAMS»(ref-12238-S31567644982000121500000). Reconnect all connectors and retest system.

Verify customer complaint. Visually inspect the following mechanical components of the shift lock system

  1. Shift lever assembly for damage or misadjustment.
  2. Ignition or Brake Pedal Position (BPP) switch for damage or misadjustment.

Verify customer complaint. Visually inspect the following electrical components of the shift lock system

  1. Fuses No. 9 and 10 (7.5-amp), or fuse No. 13 (15-amp).
  2. Loose or damaged connections.
  3. Brake Pedal Position (BPP) switch connections.
  4. Wiring harness.

Note. See appropriate wiring diagram to diagnose electrical circuits and identify fuses and circuit numbers. See WIRING DIAGRAMS .

Scheme 53

Scheme 53
Scheme 53
  1. Check MINI Fuse No. 9 (7.5-Amp) Remove and check MINI fuse No. 9 (7.5-amp), located in central junction box. See «WIRING DIAGRAMS»(ref-12238-S31567644982000121500000). If fuse is blown, go to next step. If fuse is okay, go to step 3.
  2. Check VPWR Circuit (Brown Wire) To BPP Switch For Short To Ground Turn ignition switch to OFF position. Disconnect BPP switch harness connector. Using DVOM, measure resistance between chassis ground and BPP switch harness connector terminal No. 3 (Brown wire). (Scheme 53) If resistance is more than 10 k/ohms, go to next step. If resistance is 10 k/ohms or less, repair short to ground in Brown wire between fuse No. 9 and BPP switch. See «WIRING DIAGRAMS»(ref-12238-S31567644982000121500000). Reconnect all connectors and retest system.
  3. Check VPWR Circuit (Brown Wire) For Open Using DVOM, measure resistance between fuse No. 9 output terminal and BPP switch harness connector terminal No. 3 (Brown wire). (Scheme 53) If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Brown wire between fuse No. 9 and BPP switch. See «WIRING DIAGRAMS»(ref-12238-S31567644982000121500000). Reconnect all connectors and retest system.
  4. Check BPP Switch Apply brake pedal and hold. Using DVOM, measure and record resistance between BPP switch harness connector terminals No. 2 and 3. (Scheme 53) Resistance should be more than 10 k/ohms without brake pedal applied and 5 ohms or less with brake pedal applied. If switch resistance is as specified, go to next step. If switch resistance is not as specified, replace BPP switch and retest system.
  5. Check VPWR Circuit (Red/Light Green Wire) From BPP Switch For Short To Ground Disconnect shift lock actuator 3-pin connector. Using DVOM, measure resistance between chassis ground and shift lock actuator harness connector terminal No. 1 (Red/Light Green wire). If resistance is more than 10 k/ohms, go to next step. If resistance is 10 k/ohms or less, repair short to ground in Red/Light Green wire between BPP switch harness connector and shift lock actuator connector. See «WIRING DIAGRAMS»(ref-12238-S31567644982000121500000). Reconnect all connectors and retest system.
  6. Check VPWR Circuit (Red/Light Green Wire) For Open Using DVOM, measure resistance of wire between BPP switch harness connector terminal No. 2 (Red/Light Green wire) and shift lock actuator harness connector terminal No. 1 (Red/Light Green wire). If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Red/Light Green wire between BPP switch harness connector and shift lock actuator connector. See «WIRING DIAGRAMS»(ref-12238-S31567644982000121500000). Reconnect all connectors and retest system.
  7. Check VPWR Circuit (Gray/Yellow Wire) To Shift Lock Actuator For Voltage Turn ignition switch to ON position. Using DVOM, measure voltage between chassis ground and shift lock actuator harness connector terminal No. 3 (Gray/Yellow wire). If battery voltage is not present, go to next step. If battery voltage is present, go to step 11.
  8. Check Fuse No. 10 (7.5-Amp) Turn ignition switch to OFF position. Remove and check fuse No. 10 (7.5-amp). See «WIRING DIAGRAMS»(ref-12238-S31567644982000121500000). If fuse is blown, go to next step. If fuse is okay, go to step 10.
  9. Check VPWR Circuit (Gray/Yellow Wire) For Short To Ground Using DVOM, measure resistance between chassis ground and shift lock actuator harness connector terminal No. 3 (Gray/Yellow wire). If resistance is more than 10 k/ohms, go to next step. If resistance is 10 k/ohms or less, repair short to ground in Gray/Yellow wire between fuse No. 10 and shift lock actuator connector. See «WIRING DIAGRAMS»(ref-12238-S31567644982000121500000). Reconnect all connectors and retest system.
  10. Check VPWR Circuit (Gray/Yellow Wire) For Open Using DVOM, measure resistance between fuse No. 10 output terminal and shift lock actuator harness connector terminal No. 3 (Gray/Yellow wire). If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Gray/Yellow wire between fuse No. 10 and shift lock actuator connector. See «WIRING DIAGRAMS»(ref-12238-S31567644982000121500000). Reconnect all connectors and retest system.
  11. Check Ground Circuit (Black Wire) To Shift Lock Actuator For Open Using DVOM, measure resistance between chassis ground and shift lock actuator harness connector terminal No. 2 (Black wire). If resistance is 5 ohms or less, replace shift lock actuator. Reconnect all connectors and retest system. If resistance is more than 5 ohms, repair open in Black wire between shift lock actuator connector and ground. See «WIRING DIAGRAMS»(ref-12238-S31567644982000121500000). Reconnect all connectors and retest system.

Verify customer complaint. Visually inspect the following mechanical components of the shift lock system

  1. Shift lever assembly for damage or misadjustment.
  2. Ignition switch/interlock cable for damage or misadjustment.
  3. Switches and brackets for damaged.

Verify customer complaint. Visually inspect the following electrical components of the shift lock system

  1. Fuse No. 8 (30-amp) and No. 54 (15-amp).
  2. Loose or damaged connections.
  3. Brake Pedal Position (BPP) switch connections.
  4. Wiring harness.

Note. See appropriate wiring diagram to diagnose electrical circuits and identify fuses and circuit numbers. See WIRING DIAGRAMS .

Scheme 54

Scheme 54
Scheme 54

Scheme 55

Scheme 55
Scheme 55
  1. Check Brakelight Operation Turn ignition switch to ON position. Apply brake pedal and hold. If brakelights do not illuminate, go to next step. If brakelights illuminate, go to step 3.
  2. Check Fuse No. 54 (15-Amp) Remove and check fuse No. 54 (15-amp), located in central junction box. If fuse is blown, replace fuse and retest system. If fuse fails again, check brakelight switch and brakelight circuits for short to ground. See «WIRING DIAGRAMS»(ref-12238-S31567644982000121500000). If fuse is okay, see EXTERIOR LIGHTS article in ACCESSORIES & EQUIPMENT.
  3. Check Key Removal Inhibit Circuit Turn ignition switch to ON position. Place gearshift lever in "P" position. If ignition switch can be turned to OFF position and key removed, go to next step. If ignition switch cannot be turned to OFF position and key cannot removed, go to step 8.
  4. Check VPWR Circuit (Green/White Wire) To Shift Lock Actuator For Open Disconnect gearshift lever unit 6-pin harness connector C931. Using DVOM, measure voltage between chassis ground and gearshift lever unit harness connector C931 terminal No. 3 (Green/White wire). (Scheme 54) There should be zero volts present when brake pedal is released and battery voltage should be present when brake pedal is applied. If voltage is as specified, go to next step. If voltage is not as specified, repair open in Green/White wire between brakelight switch and gearshift lever unit. See «WIRING DIAGRAMS»(ref-12238-S31567644982000121500000).
  5. Check Ground Circuit (Black Wire) To Gearshift Lever Unit Using DVOM, measure resistance between chassis ground and gearshift lever unit harness connector C931 terminal No. 1 (Black wire). (Scheme 54) If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Black wire between gearshift lever unit and ground connection (G203), located at right kick panel. See «WIRING DIAGRAMS»(ref-12238-S31567644982000121500000). Retest system.
  6. Check Brake Shift Lock Actuator Circuit Place gearshift lever in "P" position. Using DVOM, measure resistance between gearshift lever unit harness connector C931 terminals No. 1 (Black wire) and 3 (Green/White wire). (Scheme 54) If resistance is less than 10 ohms, go to next step. If resistance is 10 ohms or more, replace shift lock actuator. Retest system.
  7. Check Function Of Brake Shift Lock Actuator Using DVOM, measure resistance between gearshift lever unit harness connector C931 terminals No. 1 (Black wire) and 3 (Green/White wire) with gearshift lever in "R", "N", "D", "2" and "1" positions. (Scheme 54) If each resistance measurement is more than 10 ohms, shift lock actuator is okay. Check for mechanical fault. If any resistance measurement is 10 ohms or less, replace shift lock actuator. Retest system.
  8. Check Fuse No. 8 (30-Amp) Remove and check fuse No. 8 (30-amp). If fuse is okay, go to next step. If fuse is blown, replace fuse and recheck system. If fuse fails again, check for short to ground in Red wire between key removal inhibit solenoid, or inhibit solenoid at ignition switch and fuse No. 8 (30-amp). See «WIRING DIAGRAMS»(ref-12238-S31567644982000121500000).
  9. Check Brake Shift Lock Actuator Switch Disconnect gearshift lever unit 6-pin harness connector C931. Connect jumper wire between chassis ground and gearshift lever unit 6-pin harness connector C931 terminal No. 2 (Black/Yellow wire). (Scheme 54) If ignition key can be removed when terminal is grounded, go to next step. If ignition key cannot be removed when terminal is grounded, go to step 11.
  10. Check Ground Circuit (Black Wire) To Gearshift Lever Unit Using DVOM, measure resistance between chassis ground and gearshift lever unit harness connector C931 terminal No. 1 (Black wire). (Scheme 54) If resistance is less than 5 ohms, replace gearshift lever unit. If resistance is 5 ohms or more, repair open in Black wire between gearshift lever unit and ground connection (G203) located at right kick panel. See «WIRING DIAGRAMS»(ref-12238-S31567644982000121500000). Retest system.
  11. Check VPWR Circuit To Fuse No. 8 (30-Amp) Using DVOM, measure voltage at fuse No. 8 (30-amp) input terminal (located in battery junction box). If battery voltage is present, go to next step. If battery voltage is not present, repair open in power supply circuit to fuse No. 8 (30-amp).
  12. Check VPWR Circuit To Ignition Switch Disconnect ignition switch 7-pin harness connector C456. Using DVOM, measure voltage between chassis ground and ignition switch 7-pin harness connector terminal No. 4 (Red wire). (Scheme 55) If battery voltage is present, go to next step. If voltage is not present, repair open in Red wire between fuse No. 8 (30-amp) and ignition switch. See «WIRING DIAGRAMS»(ref-12238-S31567644982000121500000). Retest system.
  13. Check Ground Circuit (Black/Yellow Wire) To Key Removal Inhibit Solenoid Using DVOM, measure resistance between gearshift lever unit 6-pin harness connector C931 terminal No. 2 (Black/Yellow wire) and ignition switch 7-pin harness connector C456 terminal No. 3 (Black/Yellow wire). (Scheme 54)and (Scheme 55). If resistance is less than 5 ohms, replace key removal inhibit solenoid. If resistance is 5 ohms or more, repair open circuit in Black/Yellow wire between ignition switch and gearshift lever unit. See «WIRING DIAGRAMS»(ref-12238-S31567644982000121500000). Retest system.

Verify customer complaint. Visually inspect the following mechanical components of the shift lock system

  1. Shift lever assembly for damage or misadjustment.
  2. Ignition switch/interlock cable for damage or misadjustment.
  3. Switches and brackets for damaged.
  4. Brake Pedal Position (BPP) switch.

Verify customer complaint. Visually inspect the following electrical components of the shift lock system

  1. Fuse No. 235 (5-amp).
  2. Loose or damaged connections.
  3. Front Electronic Module (FEM).
  4. Shift lock actuator.
  5. Wiring harness.

Note. Some Lincoln LS models are equipped with an Interactive Vehicle Dynamics (IVD) system. IVD is an Anti-lock Brake System (ABS) incorporating Traction Control (TC) and stability assist. See appropriate wiring diagram to diagnose electrical circuits and identify fuses and circuit numbers. See WIRING DIAGRAMS .

Scheme 56

Scheme 56
Scheme 56

Scheme 57

Scheme 57
Scheme 57
  1. Check Front Electronic Module (FEM) DTCs Ensure ignition switch is turned to OFF position and gearshift lever is in "P" position. Connect scan tool to DLC. Turn ignition switch to ON position. Retrieve FEM DTCs. If any DTCs for Brake Pedal Position (BPP) switch are present, see EXTERIOR LIGHTS article in ACCESSORIES & EQUIPMENT. If no DTCs for BPP switch are present, go to next step.
  2. Check VPWR Circuit (Yellow/Violet Wire) For Voltage Turn ignition switch to OFF position. Disconnect brake shift interlock actuator 2-pin harness connector C322 (located behind dash panel, near steering column). (Scheme 56) Turn ignition switch to ON position. Apply brake pedal and hold. Measure voltage between chassis ground and brake shift interlock actuator harness connector C322 terminal No. 2 (Yellow/Violet wire). If voltage is more than 10 volts, go to step 5. If voltage is 10 volts or less, go to next step.
  3. Check VPWR Circuit (Yellow/Violet Wire) For Short To Ground Turn ignition switch to OFF position. Disconnect FEM 20-pin harness connector C201F. (Scheme 57) Measure resistance between chassis ground and brake shift interlock actuator harness connector C322 terminal No. 2 (Yellow/Violet wire). If resistance is more than 10 k/ohms, go to next step. If resistance is 10 k/ohms or less, repair short to ground in Yellow/Violet wire. See «WIRING DIAGRAMS»(ref-12238-S31567644982000121500000). Retest system.
  4. Check VPWR Circuit (Yellow/Violet Wire) For Open Measure resistance between brake shift interlock actuator harness connector C322 terminal No. 2 (Yellow/Violet wire) and FEM 20-pin harness connector C201F terminal No. 15 (Yellow/Violet wire). If resistance is less than 5 ohms, replace FEM. Retest system. If resistance is 5 ohms or more, repair open in Yellow/Violet wire. See «WIRING DIAGRAMS»(ref-12238-S31567644982000121500000). Retest system.
  5. Check Ground Circuit (Black Wire) For Open Measure resistance between chassis ground and brake shift interlock actuator 2-pin harness connector C322 terminal No. 1 (Black wire). (Scheme 56) If resistance is less than 5 ohms, replace brake shift interlock actuator. Retest system. If resistance is 5 ohms or more, repair open in Black wire. See «WIRING DIAGRAMS»(ref-12238-S31567644982000121500000). Retest system.

Verify customer complaint. Visually inspect the following mechanical components of the shift lock system

  1. Shift lever assembly and cable for damage or misadjustment.
  2. Ignition or Brake Pedal Position (BPP) switch for damage or misadjustment.

Verify customer complaint. Visually inspect the following electrical components of the shift lock system

  1. Fuses No. 17, 33 or 35 (15-amp).
  2. Open or shorted circuits.
  3. Loose or damaged connections.
  4. Brake Pedal Position (BPP) switch connections.

Note. See appropriate wiring diagram to diagnose electrical circuits and identify fuses and circuit numbers. See WIRING DIAGRAMS .

  1. Check Brakelight Operation Apply brake pedal and hold. If brakelights illuminate, go to next step. If brakelights do not illuminate, diagnose BPP switch and brakelight circuits. See EXTERIOR LIGHTS article in ACCESSORIES & EQUIPMENT.
  2. Check VPWR Circuit (Light Green Wire) To Shift Lock Actuator For Voltage Disconnect shift lock actuator 3-pin connector. Apply brake pedal and hold. Using DVOM, measure voltage between chassis ground and shift lock actuator harness connector terminal No. 1 (Light Green wire). If voltage is present with brake pedal applied, go to next step. If voltage is not present with brake pedal applied, repair faulty fuse No. 35 (15-amp), or open or short to ground in Light Green wire. See «WIRING DIAGRAMS»(ref-12238-S31567644982000121500000) . Reconnect all connectors and retest system.
  3. Check VPWR Circuit (White/Light Blue Wire) To Shift Lock Actuator For Voltage Using DVOM, measure voltage between chassis ground and shift lock actuator harness connector terminal No. 3 (White/Light Blue wire). If battery voltage is present, go to next step. If battery voltage is not present, repair faulty fuse No. 17 (15-amp), or open or short to ground in White/Light Blue wire. See «WIRING DIAGRAMS»(ref-12238-S31567644982000121500000) . Reconnect all connectors and retest system.
  4. Check Ground Circuit (Black Wire) To Shift Lock Actuator For Open Using DVOM, measure resistance between chassis ground and shift lock actuator harness connector terminal No. 2 (Black wire). If resistance is less than 5 ohms, replace shift lock actuator. If resistance is 5 ohms or more, repair open in Black wire. See «WIRING DIAGRAMS»(ref-12238-S31567644982000121500000) . Reconnect all connectors and retest system.

Verify customer complaint. Visually inspect the following mechanical components of the shift lock system

  1. Shift lever assembly for damage or misadjustment.
  2. Ignition or Brake Pedal Position (BPP) switch for damage or misadjustment.

Verify customer complaint. Visually inspect the following electrical components of the shift lock system

  1. Fuse No. 232 (10-amp) or fuse No. 217 (15-amp).
  2. Loose or damaged connections.
  3. Brake Pedal Position (BPP) switch connections.
  4. Wiring harness.

Note. See appropriate wiring diagram to diagnose electrical circuits and identify fuses and circuit numbers. See WIRING DIAGRAMS .

  1. Check Brakelight Operation Apply brake pedal and hold. If brakelights illuminate, go to step 7 . If brakelights do not illuminate, go to next step.
  2. Check Fuse No. 217 (15-Amp) Remove and check fuse No. 217 (15-amp), located in central junction box. See «WIRING DIAGRAMS»(ref-12238-S31567644982000121500000) . If fuse is blown, go to next step. If fuse is okay, go to step 4 .
  3. Check VPWR Circuit (Light Green/Red Wire) To BPP Switch For Short To Ground Ensure fuse No. 217 (15-amp) is removed from central junction box. Disconnect BPP switch harness connector. Using DVOM, measure resistance between chassis ground and BPP switch harness connector terminal No. 1 on Wagon models, or terminal No. 2 on Sedan models (Light Green/Red wire). If resistance is more than 10 k/ohms, go to next step. If resistance is 10 k/ohms or less, repair short to ground in Light Green/Red wire between fuse No. 217 and BPP switch. See «WIRING DIAGRAMS»(ref-12238-S31567644982000121500000) . Reconnect all connectors and retest system.
  4. Check VPWR Circuit (Light Green/Red Wire) To BPP Switch For Open Using DVOM, measure resistance between fuse No. 217 (15-amp) output terminal and BPP switch harness connector terminal No. 1 on Wagon models, or terminal No. 2 on Sedan models (Light Green/Red wire). If resistance is 5 ohms or less, go to next step. If resistance is more than 5 ohms, repair open in Light Green/Red wire between fuse No. 217 (15-amp) and BPP switch. See «WIRING DIAGRAMS»(ref-12238-S31567644982000121500000) . Reconnect all connectors and retest system.
  5. Check BPP Switch Apply brake pedal and hold. Using DVOM, measure and record resistance between both BPP switch harness connector terminals. Resistance should be more than 10 k/ohms without brake pedal applied and 5 ohms or less with brake pedal applied. If switch resistance is as specified, go to next step. If switch resistance is not as specified, replace BPP switch and retest system.
  6. Check VPWR Circuit (Red/Light Green Wire) To Shift Lock Actuator For Short To Ground Disconnect shift lock actuator 3-pin connector. Using DVOM, measure resistance between chassis ground and shift lock actuator harness connector terminal No. 1 (Red/Light Green wire). If resistance is more than 10 k/ohms, go to next step. If resistance is 10 k/ohms or less, repair short to ground in Red/Light Green wire between BPP switch harness connector and shift lock actuator connector. See «WIRING DIAGRAMS»(ref-12238-S31567644982000121500000) . Reconnect all connectors and retest system.
  7. Check VPWR Circuit (Red/Light Green Wire) To Shift Lock Actuator For Open Using DVOM, measure resistance between BPP switch harness connector terminal No. 1 on Sedan models, or terminal No. 2 on Wagon models (Red/Light Green wire) and shift lock actuator harness connector terminal No. 1 (Red/Light Green wire). If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Red/Light Green wire between splice No. 231 and shift lock actuator connector. See «WIRING DIAGRAMS»(ref-12238-S31567644982000121500000) . Reconnect all connectors and retest system.
  8. Check VPWR Circuit (Orange Wire) To Shift Lock Actuator For Voltage Turn ignition switch to ON position. Using DVOM, measure voltage between chassis ground and shift lock actuator harness connector terminal No. 3 (Orange wire). If battery voltage is not present, go to next step. If battery voltage is present, go to step 12 .
  9. Check Fuse No. 232 (10-Amp) Turn ignition switch to OFF position. Remove and check fuse No. 232 (10-amp). See «WIRING DIAGRAMS»(ref-12238-S31567644982000121500000) . If fuse is blown, go to next step. If fuse is okay, go to step 11 .
  10. Check VPWR Circuit (Orange Wire) To Shift Lock Actuator For Short To Ground Using DVOM, measure resistance between chassis ground and shift lock actuator connector terminal No. 3 (Orange wire). If resistance is more than 10 k/ohms, go to next step. If resistance is 10 k/ohms or less, repair short to ground in Orange wire between fuse and shift lock actuator connector. See «WIRING DIAGRAMS»(ref-12238-S31567644982000121500000) . Reconnect all connectors and retest system.
  11. Check VPWR Circuit (Orange Wire) To Shift Lock Actuator For Open Using DVOM, measure resistance between fuse No. 232 output terminal and shift lock actuator harness connector terminal No. 3 (Orange wire). If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Orange wire between fuse No. 232 and shift lock actuator connector. See «WIRING DIAGRAMS»(ref-12238-S31567644982000121500000) . Reconnect all connectors and retest system.
  12. Check Ground Circuit (Black Wire) To Shift Lock Actuator For Open Using DVOM, measure resistance between chassis ground and shift lock actuator harness connector terminal No. 2 (Black wire). If resistance is less than 5 ohms, replace shift lock actuator. Reconnect all connectors and retest system. If resistance is 5 ohms or more, repair open in Black wire between shift lock actuator connector and ground connection (G206), located behind center of dash. See «WIRING DIAGRAMS»(ref-12238-S31567644982000121500000) .

Verify customer complaint. Visually inspect the following mechanical components of the shift lock system

  1. Shift lever assembly for damage or misadjustment.
  2. Ignition or Brake Pedal Position (BPP) switch for damage or misadjustment.

Verify customer complaint. Visually inspect the following electrical components of the shift lock system

  1. Fuse No. 20 (7.5-amp), fuse No. 8 (10-amp) or fuse No. 10 (20-amp).
  2. Loose or damaged connections.
  3. Brake Pedal Position (BPP) switch connections.
  4. Wiring harness.

Note. See appropriate wiring diagram to diagnose electrical circuits and identify fuses and circuit numbers. See WIRING DIAGRAMS .

  1. Check Brakelight Operation Apply brake pedal. If brakelights do not illuminate, go to next step. If brakelights illuminate, go to step 8 .
  2. Check Fuse No. 10 (20-Amp) Remove and check fuse No. 10 (20-amp), located in central junction box. See «WIRING DIAGRAMS»(ref-12238-S31567644982000121500000) . If fuse is blown, go to next step. If fuse is okay, go to step 5 .
  3. Check VPWR Circuit (Light Green/Red Wire) To BPP Switch For Short To Ground Turn ignition switch to OFF position. Ensure fuse No. 10 (20-amp) is removed from central junction box. Disconnect BPP switch harness connector. Using DVOM, measure resistance between chassis ground and BPP switch harness connector terminal No. 1 (Light Green/Red wire). If resistance is more 10 k/ohms, go to next step. If resistance is 10 k/ohms or less, repair short to ground in Light Green/Red wire between fuse No. 10 and BPP switch. See «WIRING DIAGRAMS»(ref-12238-S31567644982000121500000) . Reconnect all connectors and retest system.
  4. Check VPWR Circuit (Light Green Wire) To Fuse No. 20 (7.5-Amp) For Short To Ground Using DVOM, measure resistance between chassis ground and BPP switch harness connector terminal No. 2 (Light Green wire). If resistance is more 10 k/ohms, go to next step. If resistance is 10 k/ohms or less, repair short to ground in Light Green wire between BPP switch and fuse No. 20. See «WIRING DIAGRAMS»(ref-12238-S31567644982000121500000) . Reconnect all connectors and retest system.
  5. Check VPWR Circuit (Light Green/Red Wire) To BPP Switch For Open Using DVOM, measure resistance between fuse No. 10 output terminal and BPP switch harness connector terminal No. 1 (Light Green/Red wire). If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Light Green/Red wire between fuse No. 10 and BPP switch. See «WIRING DIAGRAMS»(ref-12238-S31567644982000121500000) . Reconnect all connectors and retest system.
  6. Check VPWR Circuit (Light Green Wire) To Fuse No. 20 (7.5-Amp) For Open Using DVOM, measure resistance between BPP switch harness connector terminal No. 2 (Light Green wire) and fuse No. 20 input terminal. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Light Green wire between BPP switch and fuse No. 20. See «WIRING DIAGRAMS»(ref-12238-S31567644982000121500000) . Reconnect all connectors and retest system.
  7. Check BPP Switch Apply brake pedal and hold. Using DVOM, measure and record resistance between both BPP switch harness connector terminals. Resistance should be more than 10 k/ohms without brake pedal applied and 5 ohms or less with brake pedal applied. If switch resistance is as specified, go to next step. If switch resistance is not as specified, replace BPP switch and retest system.
  8. Check Fuse No. 20 (7.5-Amp) Remove and check fuse No. 20 (7.5-amp), located in central junction box. See «WIRING DIAGRAMS»(ref-12238-S31567644982000121500000) . If fuse is blown, go to next step. If fuse is okay, go to step 10 .
  9. Check VPWR Circuit (Red/Light Green Wire) To Shift Lock Actuator For Short To Ground Disconnect shift lock actuator 3-pin connector. Using DVOM, measure resistance between chassis ground and shift lock actuator harness connector terminal No. 1 (Red/Light Green wire). If resistance is more than 10 k/ohms, go to next step. If resistance is 10 k/ohms or less, repair short to ground in Red/Light Green wire between BPP switch harness connector and shift lock actuator connector. See «WIRING DIAGRAMS»(ref-12238-S31567644982000121500000) . Reconnect all connectors and retest system.
  10. Check VPWR Circuit (Red/Light Green Wire) To Shift Lock Actuator For Open Using DVOM, measure resistance of Red/Light Green wire between fuse No. 20 (7.5-amp) output terminal and shift lock actuator harness connector terminal No. 1. If resistance is 5 ohms or less, go to next step. If resistance is more than 5 ohms, repair open in Red/Light Green wire between fuse No. 20 and shift lock actuator connector. See «WIRING DIAGRAMS»(ref-12238-S31567644982000121500000) . Reconnect all connectors and retest system.
  11. Check VPWR Circuit (White/Violet Wire) To Shift Lock Actuator For Voltage Turn ignition switch to ON position. Using DVOM, measure voltage between chassis ground and shift lock actuator harness connector terminal No. 3 (White/Violet wire). If battery voltage is not present, go to next step. If battery voltage is present, go to step 15 .
  12. Check Fuse No. 8 (10-Amp) Turn ignition switch to OFF position. Remove and check fuse No. 8 (10-amp). See «WIRING DIAGRAMS»(ref-12238-S31567644982000121500000) . If fuse is blown, go to next step. If fuse is okay, go to step 14 .
  13. Check VPWR Circuit (White/Violet Wire) To Shift Lock Actuator For Short To Ground Using DVOM, measure resistance between chassis ground and shift lock actuator harness connector terminal No. 3 (White/Violet wire). If resistance is more than 10 k/ohms, go to next step. If resistance is 10 k/ohms or less, repair open in White/Violet wire between fuse No. 8 and shift lock actuator connector. See «WIRING DIAGRAMS»(ref-12238-S31567644982000121500000) . Reconnect all connectors and retest system.
  14. Check VPWR Circuit (White/Violet Wire) To Shift Lock Actuator For Open Using DVOM, measure resistance between fuse No. 8 output terminal and shift lock actuator harness connector terminal No. 3 (White/Violet wire). If resistance is 5 ohms or less, go to next step. If resistance is more than 5 ohms, repair open in White/Violet wire between fuse No. 8 and shift lock actuator connector. See «WIRING DIAGRAMS»(ref-12238-S31567644982000121500000) . Reconnect all connectors and retest system.
  15. Check Ground Circuit (Black Wire) To Shift Lock Actuator For Open Using DVOM, measure resistance between chassis ground and shift lock actuator harness connector terminal No. 2 (Black wire). If resistance is 5 ohms or less, replace shift lock actuator. Reconnect all connectors and retest system. If resistance is more than 5 ohms, repair open in Black wire between shift lock actuator connector and ground. See «WIRING DIAGRAMS»(ref-12238-S31567644982000121500000) . Reconnect all connectors and retest system.

Verify customer complaint. Visually inspect the following mechanical components of the shift lock system

  1. Shift lever assembly for damage or misadjustment.
  2. Ignition or deactivator switch for damage or misadjustment.

Verify customer complaint. Visually inspect the following electrical components of the shift lock system

  1. Fuse No. 37 (10-amp).
  2. Loose or damaged connections.
  3. Deactivator switch connections.
  4. Wiring harness.

Note. See appropriate wiring diagram to diagnose electrical circuits and identify fuses and circuit numbers. See WIRING DIAGRAMS .

  1. Check Ground Circuit (Black Wire) To Shift Lock Actuator Turn ignition switch to OFF position. Disconnect shift lock actuator 2-pin connector. Using DVOM, measure resistance between chassis ground and shift lock actuator harness connector terminal No. 1 (Black wire). If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Black wire between shift lock actuator and ground. See «WIRING DIAGRAMS»(ref-12238-S31567644982000121500000) .
  2. Check VPWR Circuit (White Wire) To Shift Lock Actuator Turn ignition switch to ON position. Using DVOM, measure voltage between chassis ground and shift lock actuator harness connector terminal No. 2 (White wire). Voltage should be more than 10 volts with brake pedal released and less than one volt with brake pedal applied. If voltage is not as specified, go to next step. If voltage is as specified, replace shift lock actuator. Reconnect all connectors and retest system.
  3. Check VPWR Circuit (White Wire) To Shift Lock Actuator For Open Turn ignition switch to OFF position. Disconnect deactivator switch harness connector. Using DVOM, measure resistance of White wire between deactivator switch harness connector terminal No. 2 and shift lock actuator harness connector terminal No. 2. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in White wire between deactivator switch and shift lock actuator. See «WIRING DIAGRAMS»(ref-12238-S31567644982000121500000) . Reconnect all connectors and retest system.
  4. Check Deactivator Switch Input Turn ignition switch to ON position. Using DVOM, measure voltage between chassis ground and deactivator switch harness connector terminal No. 1 (Blue wire). If voltage is more than 10 volts, replace deactivator switch and retest system. If voltage is 10 volts or less, check for open in Blue wire between deactivator switch and fuse No. 37 (10-amp), or blown fuse No. 37 in central junction box. See «WIRING DIAGRAMS»(ref-12238-S31567644982000121500000) . Reconnect all connectors and retest system.

Verify customer complaint. Visually inspect the following mechanical components of the shift lock system

  1. Shift lever assembly for damage or misadjustment.
  2. Ignition or Brake Pedal Position (BPP) switch for damage or misadjustment.

Verify customer complaint. Visually inspect the following electrical components of the shift lock system

  1. Fuses No. 10 or 11 (10-amp).
  2. Loose or damaged connections.
  3. Brake Pedal Position (BPP) switch connections.
  4. Wiring harness.

Note. See appropriate wiring diagram to diagnose electrical circuits and identify fuses and circuit numbers. See WIRING DIAGRAMS .

  1. Check Brakelight Operation Apply brake pedal. If brakelights illuminate, go to step 7 . If brakelights do not illuminate, go to next step.
  2. Check Fuse No. 11 (10-Amp) Remove and check fuse No. 11 (10-amp), located in central junction box. See «WIRING DIAGRAMS»(ref-12238-S31567644982000121500000) . If fuse is blown, go to next step. If fuse is okay, go to step 4 .
  3. Check VPWR Circuit (Light Green/Red Wire) To BPP Switch For Short To Ground Ensure fuse No. 11 (10-amp) is removed from central junction box. Disconnect BPP switch harness connector. Using DVOM, measure resistance between chassis ground and BPP switch harness connector terminal No. 1 (Light Green/Red wire). If resistance is more than 10 k/ohms, go to next step. If resistance is 10 k/ohms or less, repair short to ground in Light Green/Red wire between fuse No. 11 and BPP switch. See «WIRING DIAGRAMS»(ref-12238-S31567644982000121500000) . Reconnect all connectors and retest system.
  4. Check VPWR Circuit (Light Green/Red Wire) To BPP Switch For Open Using DVOM, measure resistance between fuse No. 11 output terminal and BPP switch harness connector terminal No. 1 (Light Green/Red wire). If resistance is 5 ohms or less, go to next step. If resistance is more than 5 ohms, repair open in Light Green/Red wire between fuse No. 11 and BPP switch. See «WIRING DIAGRAMS»(ref-12238-S31567644982000121500000) . Reconnect all connectors and retest system.
  5. Check BPP Switch Apply brake pedal and hold. Using DVOM, measure resistance between both BPP switch harness connector terminals. Resistance should be more than 10 k/ohms without brake pedal applied and less than 5 ohms with brake pedal applied. If switch resistance is as specified, go to next step. If switch resistance is not as specified, replace BPP switch and retest system.
  6. Check VPWR Circuit (Red/Light Green Wire) To Shift Lock Actuator For Short To Ground Disconnect shift lock actuator 3-pin connector. Using DVOM, measure resistance between chassis ground and shift lock actuator harness connector terminal No. 1 (Red/Light Green wire). If resistance is more than 10 k/ohms, go to next step. If resistance is 10 k/ohms or less, repair short to ground in Red/Light Green wire between BPP switch harness connector and shift lock actuator connector. See «WIRING DIAGRAMS»(ref-12238-S31567644982000121500000) . Reconnect all connectors and retest system.
  7. Check VPWR Circuit (Red/Light Green Wire) To Shift Lock Actuator For Open Using DVOM, measure resistance of Red/Light Green wire between BPP switch harness connector terminal No. 2 and shift lock actuator harness connector terminal No. 1. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Red/Light Green wire between BPP switch harness connector and shift lock actuator connector. See «WIRING DIAGRAMS»(ref-12238-S31567644982000121500000) . Reconnect all connectors and retest system.
  8. Check VPWR Circuit (Red/Black Wire) To Shift Lock Actuator For Voltage Turn ignition switch to ON position. Using DVOM, measure voltage between chassis ground and shift lock actuator harness connector terminal No. 3 (Red/Black wire). If battery voltage is not present, go to next step. If battery voltage is present, go to step 12 .
  9. Check Fuse No. 10 (10-Amp) Turn ignition switch to OFF position. Remove and check fuse No. 10 (10-amp), located in central junction box. See «WIRING DIAGRAMS»(ref-12238-S31567644982000121500000) . If fuse is blown, go to next step. If fuse is okay, go to step 11 .
  10. Check VPWR Circuit (Red/Black Wire) To Shift Lock Actuator For Short To Ground Using DVOM, measure resistance between chassis ground and shift lock actuator connector terminal No. 3 (Red/Black wire). If resistance is more than 10 k/ohms, go to next step. If resistance is 10 k/ohms or less, repair short to ground in Red/Black wire between fuse No. 10 and shift lock actuator connector. See «WIRING DIAGRAMS»(ref-12238-S31567644982000121500000) . Reconnect all connectors and retest system.
  11. Check VPWR Circuit (Red/Black Wire) To Shift Lock Actuator For Open Using DVOM, measure resistance of Red/Black wire between fuse No. 10 output terminal and shift lock actuator harness connector terminal No. 3. If resistance is 5 ohms or less, go to next step. If resistance is more than 5 ohms, repair open in Red/Black wire between fuse No. 10 and shift lock actuator connector. See «WIRING DIAGRAMS»(ref-12238-S31567644982000121500000) . Reconnect all connectors and retest system.
  12. Check Ground Circuit (Black Wire) For Open Using DVOM, measure resistance between chassis ground and shift lock actuator harness connector terminal No. 2 (Black wire). If resistance is 5 ohms or less, replace shift lock actuator. Reconnect all connectors and retest system. If resistance is more than 5 ohms, repair open in Black wire between shift lock actuator connector and ground. See «WIRING DIAGRAMS»(ref-12238-S31567644982000121500000) . Reconnect all connectors and retest system.

SHIFT INTERLOCK CABLE

Note. Procedures for removal and installation of shift lock cable are given in GEARSHIFT LEVER ASSEMBLY for all other models.

SHIFT INTERLOCK ACTUATOR

Note. For all other models, shift lock actuator is part of shift lock cable. See SHIFT INTERLOCK CABLE or GEARSHIFT LEVER ASSEMBLY procedures to remove actuator.

More articles — Shift Interlock System