MODEL IDENTIFICATION
| WARNING | Vehicles are equipped with Supplemental Inflatable Restraint (SIR) systems. See AIR BAG SERVICE PRECAUTIONS article in APPLICATIONS & IDENTIFICATION before attempting adjustments or repairs on or around steering column and components. |
Vehicle model is identified by fifth character of Vehicle Identification Number (VIN). VIN is stamped on metal pad on top of left end of instrument panel, near windshield. See MODEL IDENTIFICATION table.
| Series (1) | Model |
|---|---|
| "C" | 2WD Pickup, Sierra, Silverado, Suburban, Tahoe & Yukon |
| "G" | Express & Savana |
| "K" | 4WD Pickup, Sierra, Silverado, Suburban, Tahoe, Yukon & AWD Escalade |
| "P" | Forward Control (P42) & Motorhome Chassis (P32) |
| "S" | 2WD Blazer, Jimmy, S10 Pickup & Sonoma |
| "T" | 4WD Blazer, Bravada, Envoy, Jimmy, S10 Pickup & Sonoma |
| (1) Vehicle series code is fifth character of VIN. | |
| (1) | Vehicle series code is fifth character of VIN. |
MODEL IDENTIFICATION
DESCRIPTION
The transmission shift interlock system prevents driver from moving gear selector from Park unless ignition switch is turned to ON position, and prevents ignition key from being removed until gear selector is returned to Park. On models equipped with Brake Transmission Shift Interlock (BTSI) solenoid, gear selector cannot be moved from Park while ignition is on until brake pedal is depressed. This prevents accidental movement of gear selector from Park while engine is running. BTSI solenoid is located in steering column or center console.
SYSTEM OPERATION CHECK
Confirm the following system operation
- With ignition switch in LOCK position, gear selector should be locked in Park.
- With gear selector in Park, ignition switch should be allowed movement from LOCK position to any other position, and then back to LOCK position. Ignition key should be removable while in LOCK position.
- With ignition switch in ON position, gear selector should be allowed movement from Park. Models equipped with BTSI solenoid require that brake pedal be depressed for this operation.
- With ignition switch in ON position and gear selector in any position other than Park, ignition key is non-removable. Ignition key is removable only when gear selector is returned to Park.
If shift interlock system operates as specified, system is functioning properly at this time. If system does not operate as specified, diagnose by symptom. See SYMPTOM TESTS .