Shift Interlock System.pdf

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2001-02 AUTOMATIC TRANSMISSIONS
Shift Interlock Systems - Lexus & Toyota
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.
NOTE:
Diagnosis and repair information is not available for Toyota Prius. Only wiring
diagrams are provided. See WIRING DIAGRAMS .
INTRODUCTION
Transaxle/transmission is equipped with an electronically controlled shift interlock and key interlock system.
See
COMPONENT LOCATIONS
. Shift interlock system prevents gearshift lever from being moved from
Park unless brake pedal is depressed. In case of a malfunction, gearshift lever can be released by depressing
shift interlock override button, located near gearshift lever under small plastic cover (if equipped). Key
interlock system prevents ignition key from being moved from ACC to LOCK position on ignition switch
unless gearshift lever is in Park position.
System consists of brakelight switch (also referred to as stop lamp switch), key interlock solenoid, shift
interlock control Electronic Control Unit (ECU), shift interlock solenoid and shift interlock release button. All
models may not be equipped with all components.
NOTE:
Sequoia, Sienna and Tundra models are equipped with cable operated shift
interlock system. See SHIFT INTERLOCK SYSTEM OPERATION CHECK (CABLE
OPERATED) and ADJUSTMENTS .
SHIFT INTERLOCK SYSTEM
With ignition on and brake pedal depressed, an input signal is sent from brakelight switch to ECU. With
gearshift lever in Park, an input signal from shift control switch is input to ECU, indicating gearshift lever is in
Park. ECU then operates shift interlock solenoid, allowing gearshift lever movement from Park.
COMPONENT LOCATIONS
Fig. 1: Shift Interlock & Key Interlock Component Locations (Lexus GS300 & GS430)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
Fig. 2: Shift Interlock & Key Interlock Component Locations (Lexus IS300)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
Fig. 3: Shift Interlock & Key Interlock Component Locations (Lexus LS430)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
Fig. 4: Shift Interlock & Key Interlock Component Locations (Lexus LX470 & Toyota Land Cruiser)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

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