300TE 4MATIC (124.290) L6-3.0L (103.985) (1991)
Alarm Module: Diagram Information and Instructions
How to Use Information In Diagrams
How to Read Schematic Diagrams:
Electrical components which work together are shown together. Schematic drawings are arranged so that current flows from positive at the top of the
screen/page, to negative at the bottom. Fuses are shown at the top of the screen/page. All wires, connectors, switches, and motors are shown in the
flow of current to ground at the bottom of the screen/page. The "hot" labels appearing at the top of fuses or components show the Ignition
Starter/Switch positions which supply power to the point. (See Circuit Identification).
The terminal number "30" appearing on the Ignition/Starter Switch and Exterior Lamp Switch means that these terminals are always supplied with
power. The terminal number "15" on the Ignition/Starter Switch means that this terminal is supplied with power only when the Ignition/Starter Switch
is in the "Run" or "Start" positions.
Component and Wire Representation:
All wiring between components is shown exactly as it exists on the vehicle. Wiring inside complicated components has been Simplified to aid in
understanding their electrical operation. Transistorized components are shown as plain boxes labeled with a solid state symbol. Switches and sensors
are shown "at rest," as if the Ignition Starter/Switch were off. Notes are included which describe how switches and other components work.
Circuits Which Share Power and/or Grounds:
Each circuit is shown completely on one schematic diagram. Wires common to different schematics are cross referenced and marked with arrows. To
find other circuits which might share fuse terminals or screw terminal blocks, look on the Power Distribution or Fuse Block Details schematics. To
find other circuits which might share connections to ground terminals, look on the Ground Distribution schematics. (See Starting and Charging, Power
and Ground Distribution)
The Power Distribution diagrams show connections from the Battery and Alternator to the fuses, and to the Ignition Starter/Switch and Exterior Lamp
Switch. This will tell you how each circuit gets its power, and what circuits share common fuses. Ground Distribution diagrams show how several
circuits are connected to common grounds.
Component names are found underlined next to or above each component. Above the component name, you will find a Component Identification