1998 — 2003 of release

Repair and operation of the car

Lexus RX 300
+ Lexus RX-300 cars
+ Governing bodies and methods of operation
+ Settings and routine maintenance of the car
+ Engine
+ Cooling systems of the engine, heating, ventilation and air conditioning
+ A power supply system and production of the fulfilled gases
+ Systems of electric equipment of the engine
+ Automatic transmission and interaxal differential
+ Transmission line
+ Brake system
+ Suspension bracket and steering
+ Body
- Onboard electric equipment
   General information
   Diagnostics of malfunctions of onboard electric equipment - the general information
   Safety locks - the general information
   The relay - the general information and check of serviceability of functioning
   Screen wipers and windscreen washers
   Replacement of glow lamps
   Removal and installation of a casing of a steering column and understeering switches
   Check of serviceability of functioning of some auxiliary systems
   Removal and installation of the antenna
   Removal and installation of a combination of devices
   Adjustment of an inclination of headlights
   Removal and installation of components of the SRS system
   Removal and installation of components of window regulators and screen wipers
+ Schematic diagrams of electric connections

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The relay - the general information and check of serviceability of functioning

General information

For giving of power supply or a signal of management on some of consumers of the electric power in the car (such as components of system of injection of fuel, a horn, a starter, the cooling system fan, fog lights and other) relays are used. Actually the relay represents the electric key providing short circuit In/in a contour on a low-voltage signal. In case of a relay exit out of operation there is a refusal of functioning of the corresponding consumer. Installation sites of assembly blocks of the relay and safety locks are specified the illustrations Arrangement of Blocks of the Relay and Safety Locks in a motive compartment. The description of check of serviceability of functioning of the relay is given below. The failed relays are subject to replacement.



  1. If it is not possible to find out a way of turning on of the relay in the corresponding electric contour according to schemes of electric connections (Schematic diagrams of electric connections), it is necessary to remember that approach to check of any relay in principle is identical in all cases.
  2. In most cases the contour of management is always connected to two of contact plugs of the relay. When giving on these plugs of low-voltage tension current begins to circulate on a winding of management of the relay therefore there is a short circuit of big contacts of a working contour of the consumer of the electric power. Other plugs are the worker's plugs (In/in) a contour.
  3. For the purpose of simplification of identification of plugs of the relay explanatory marking with the image of the scheme of connection of keys is usually applied on its case.
  4. Before removal of the relay make sure that the corresponding contour is cut off power.
  5. Connect the wire crossing point equipped with a safety lock between one of plugs of management of the relay and the positive plug of the battery. By means of the second wire crossing point ground the second plug of management, – the relay has to publish click. Some relays demand obligatory respect for polarity of connection, - if the click did not happen, try to change polarity of connection of plugs of management.
  6. At the connected wires crossing points check existence of conductivity between the contour V/V plugs, having connected an ohmmeter according to the key scheme on the relay case.
  7. At negative result of check replace the relay.

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