DESCRIPTION & OPERATION
| WARNING | Vehicle is equipped with Supplemental Inflatable Restraint (SIR) system. When servicing vehicle, use care to avoid accidental air bag deployment. SIR system-related components are located in various locations throughout interior and exterior of vehicle, depending on application. Do not use electrical test equipment on or near these circuits. If necessary, deactivate SIR system before servicing components. See AIR BAG DEACTIVATION PROCEDURES article in GENERAL INFORMATION. |
Shift interlock system consists of a shift interlock cable/solenoid assembly connected between ignition switch and floor shifter. (Scheme 79)and (Scheme 80). A brakelight switch and PCM sense circuits are used to control Brake Transmission Shifter Interlock (BTSI) solenoid. With ignition switch in LOCK or ACC position, gearshift lever is locked in Park. With ignition switch in RUN position, gearshift lever is released from Park when brake pedal is depressed. Depressing brake pedal energizes BTSI solenoid and allows gearshift lever to be moved to any position. Shift interlock system also prevents ignition switch from being rotated to LOCK or ACC position unless gearshift lever is returned to Park. (Scheme 81)
Scheme 79
Scheme 80
Scheme 81
PRELIMINARY INSPECTION
Diagnosis of shift interlock system should begin with a general visual inspection of related components, i.e., shift linkage, electrical connections, components, etc.
SYSTEM OPERATION CHECK
- Ensure ignition key can only be removed from ignition switch with gearshift lever in Park.
- Ensure gearshift lever is in Park with push button of gearshift lever handle in released position. Ignition switch should rotate freely from OFF position to LOCK position. Ignition switch should not rotate to LOCK position with gearshift lever in any other position.
- Shifting from Park should be possible when ignition switch is in OFF position and brake pedal is depressed.
- Shifting from Park should not be possible while depressing push button of gearshift lever handle unless brake pedal is depressed with ignition switch in RUN or START position.
- Gearshift lever should be locked in Park when ignition switch is in ACC or LOCK positions.
- With ignition switch in RUN or START position, gearshift lever should be able to be moved into any position including Park without depressing brake pedal.
- If shift interlock system does not operate as specified, verify proper gearshift cable and shift interlock cable adjustments. See «ADJUSTMENTS»(/jeep/grand-cherokee/wj-1998-2004/remont/automatic-trans/#shift-interlock-systems__adjustments) . If adjustments are okay, check shift interlock system circuit. See «WIRING DIAGRAMS»(/jeep/grand-cherokee/wj-1998-2004/remont/automatic-trans/#shift-interlock-systems) .
ADJUSTMENTS
| WARNING | Vehicle is equipped with Supplemental Inflatable Restraint (SIR) system. When servicing vehicle, use care to avoid accidental air bag deployment. SIR system-related components are located in various locations throughout interior and exterior of vehicle, depending on application. Do not use electrical test equipment on or near these circuits. If necessary, deactivate SIR system before servicing components. See AIR BAG DEACTIVATION PROCEDURES article in GENERAL INFORMATION. |
Note. Gearshift cable and shift interlock cable should both be adjusted to ensure proper shift interlock system operation.
Cherokee & Wrangler
- With transmission in Park and engine off, raise vehicle on hoist. Using screwdriver, unlock gearshift cable by releasing cable adjuster clamp. (Scheme 82) Remove cable from mounting bracket. Slide cable eyelet off transmission shift lever.
- Move shift lever on transmission rearward until fully seated into Park detent. Verify engagement of park lock by attempting to rotate drive shaft. Park lock is engaged if drive shaft cannot be rotated. Slide cable eyelet onto transmission shift lever.
- Snap gearshift cable into cable mounting bracket. Press down on cable adjuster clamp to lock cable. Lower vehicle and verify engine starting. Engine should start only with gearshift lever in Park or Neutral.
Scheme 82
Grand Cherokee
- Move gearshift lever into Park. Remove gearshift lever bezel and floor console as necessary for access to gearshift cable adjustment screw. Loosen gearshift cable adjustment screw. Adjustment screw is located in slot at end of gearshift cable. (Scheme 83)
- Raise vehicle. Unsnap gearshift cable eyelet from transmission shift lever. Move shift lever fully rearward. Ensure transmission is in Park by attempting to rotate drive shaft. Snap cable eyelet onto transmission shift lever. Lower vehicle.
- Tighten gearshift cable adjustment screw to 65 INCH lbs. (7 N.m). Verify adjustment by attempting to start engine in Park and Neutral. Adjustment is okay if engine starts in Park and Neutral and does not start in any other gear position. Install gearshift lever bezel and floor console.
Scheme 83
SHIFT INTERLOCK CABLE
- Move gearshift lever into Park. Turn ignition switch to LOCK position. Remove gearshift lever bezel to access cable adjustment. Pull cable lock button up to release cable. (Scheme 80)or (Scheme 84). Use a spacer to create a.039" (1.0 mm) gap between shifter pawl and top of shift gate. Pull cable forward (rearward on Grand Cherokee) and release.
- Snap lock button into place. Verify adjustment by attempting to move gearshift lever. See «SYSTEM OPERATION CHECK»(/jeep/grand-cherokee/wj-1998-2004/remont/automatic-trans/#shift-interlock-systems__system-operation-check) under TROUBLE SHOOTING. If shift interlock system functions as specified, adjustment is okay.
Scheme 84
STOPLIGHT SWITCH
Note. Stoplight switch may also be known as brakelight switch.
| CAUTION | Do not use excessive force when pulling brake pedal upward, or stoplight switch may be damaged. |
Press and hold brake pedal to fully applied position. Pull stoplight switch plunger to fully extended position. Release brake pedal and pull pedal fully rearward. Pedal will set plunger to correct position as pedal pushes plunger into switch body. Switch will make a ratcheting sound as plunger adjusts into switch. Check stoplight switch operation.
REMOVAL & INSTALLATION
| WARNING | Vehicle is equipped with Supplemental Inflatable Restraint (SIR) system. When servicing vehicle, use care to avoid accidental air bag deployment. SIR system-related components are located in various locations throughout interior and exterior of vehicle, depending on application. Do not use electrical test equipment on or near these circuits. If necessary, deactivate SIR system before servicing components. See AIR BAG DEACTIVATION PROCEDURES article in GENERAL INFORMATION. |
| CAUTION | When battery is disconnected, vehicle computer and memory systems may lose memory data. Driveability problems may exist until computer systems have completed a relearn cycle. See COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION before disconnecting battery. |
Removal & Installation (Cherokee & Wrangler)
- Remove lower steering column cover and shroud. Remove tie strap retaining cable to steering column. (Scheme 79) Disconnect harness connector from BTSI solenoid.
- With ignition switch in RUN position, disengage lock tab holding cable end to steering column. (Scheme 85) Pull cable end from steering cable.
- Remove floor console and related trim. Disconnect cable eyelet from bellcrank. Disconnect and remove cable from shift bracket. To install cable, reverse removal procedure. Adjust cable after installation. See «SHIFT INTERLOCK CABLE»(/jeep/grand-cherokee/wj-1998-2004/remont/automatic-trans/#shift-interlock-systems__shift-interlock-cable) under ADJUSTMENTS.
Scheme 85
Removal & Installation (Grand Cherokee)
- Remove lower steering column cover. Lower steering column. Disconnect BTSI cable solenoid connector. (Scheme 80) Turn ignition switch to RUN position. Depress lock tab holding cable end to steering column. (Scheme 85) Pull cable end from steering cable.
- Remove shift interlock cable from steering column. Remove floor console and related trim. Disconnect shift interlock cable from shifter assembly. Remove cable from any retaining clips. Remove cable from vehicle. To install cable, reverse removal procedure. Adjust cable after installation. See «SHIFT INTERLOCK CABLE»(/jeep/grand-cherokee/wj-1998-2004/remont/automatic-trans/#shift-interlock-systems__shift-interlock-cable) under ADJUSTMENTS.
Note. Stoplight switch may also be known as brakelight switch.
- Stoplight switch is located in mounting bracket near top of brake pedal. Rotate stoplight switch counterclockwise 30 degrees and remove switch from mounting bracket. Disconnect electrical connector from stoplight switch.
- Pull plunger on stoplight switch outward until plunger has ratcheted outward to fully extended position. Fully depress brake pedal. Install stoplight switch in mounting bracket so index tab on stoplight switch aligns with slot in mounting bracket.
- With stoplight switch fully seated in mounting bracket, rotate stoplight switch 30 degrees to lock stoplight switch in mounting bracket. Reinstall electrical connector on stoplight switch. Adjust switch. See «STOPLIGHT SWITCH»(/jeep/grand-cherokee/wj-1998-2004/remont/automatic-trans/#shift-interlock-systems__stoplight-switch) under ADJUSTMENTS.
