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 appropriate AIR BAG DEACTIVATION PROCEDURES article in GENERAL INFORMATION. |
The shift interlock system consists of an electro-magnetic solenoid mounted on upper steering column. (Scheme 1) Brake Transmission Shift Interlock (BTSI) solenoid is controlled by the Front Control Module (FCM). The FCM is connected to underhood fuse and relay center creating the Intelligent Power Module (IPM). IPM is located in left front corner of engine compartment. (Scheme 2) With ignition switch in LOCK or ACC position, the gearshift lever is locked in Park. Depressing brake pedal with ignition switch in ON/RUN or START positions de-energizes BTSI solenoid. Solenoid plunger disengages shift lever pawl and allows gearshift lever to be moved to any position. (Scheme 3)
A conventional mechanical interlock system is also used. System manually prohibits gearshift lever movement when ignition switch is in LOCK or ACC positions. Solenoid does not function in these positions. Gearshift lever can be moved with ignition switch in OFF position. This enables vehicle to moved in the event the battery is dead or removed. Shift interlock system prevents ignition switch from being rotated to LOCK or ACC position unless gearshift lever is returned to Park.
Scheme 1
Scheme 2
Scheme 3
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 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 pulling rearward on gearshift lever handle unless brake pedal is depressed with ignition switch in ON/RUN or START position.
- Gearshift lever should be locked in Park when ignition switch is in ACC or LOCK positions. Gearshift lever should be able to be moved into any position with ignition switch in OFF position.
- With ignition switch in ON/RUN or START position, gearshift lever should be able to be moved into any position including Park without depressing brake pedal.
- If system operation is not as specified, solenoid may be malfunctioning. Diagnose and repair as necessary. See «SYMPTOM TESTS»(ref-131134-S14322806632001121300000) .