Key Interlock System

Key interlock system prevents ignition key from being removed from ignition lock assembly on steering column unless shift lever is in Park. Voltage is provided to key interlock switch from No. 30 (20-amp) fuse in engine compartment fuse box, located at passenger's front corner of engine compartment. When ignition key is in ignition lock assembly, key interlock switch closes, providing voltage to key interlock solenoid and interlock control unit.

If shift lever is not in Park, interlock control unit energizes key interlock solenoid by completing ground circuit. When key interlock solenoid is energized, ignition key cannot be removed from ignition lock assembly. Key interlock switch and solenoid are located on ignition lock assembly. See Fig 2. Interlock control unit is located behind driver's side of instrument panel and contains an 8-pin electrical connector. See Fig 3.

Fig 1: Identifying A/T Gear Position Indicator & MIL Light

Courtesy of AMERICAN HONDA MOTOR CO., INC.

Fig 2: Identifying Key Interlock Solenoid & Shift Lock Solenoid

Courtesy of AMERICAN HONDA MOTOR CO., INC.

Fig 3: Identifying Interlock Control Unit, TCM & ECM

Courtesy of AMERICAN HONDA MOTOR CO., INC.