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W116 (1972-1980, petrol) W126 (1979-1991, petrol) W140 (1991-1998) W220 (1998-2005)
  • Main
  • S-Class
  • W126 (1979-1991)
  • Electrical equipment
  • Electrical circuits
  • Explanations for the electrical equipment diagram with a 6-cylinder carburetor engine

Explanations for the electrical equipment diagram with a 6-cylinder carburetor engine (Mercedes-Benz S-Class W126)

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  • 1. Left headlight:
    • a) high beam;
    • b) low beam;
    • c) parking lighting;
    • d) fog light;
    • e) direction indicator and hazard warning lights.
  • 2. Oil pressure sensor.
  • 3. Warning buzzer contact.
  • 4. Temperature sensor for coolant temperature gauge.
  • 5. Brake lining contact sensor, front left.
  • 6. Brake pad contact sensor, front right.
  • 7. Brake fluid level indicator lamp switch.
  • 8. Instrument cluster:
    • a) control resistance of instrument panel lighting;
    • b) high beam indicator lamp;
    • c) battery charge control lamp;
    • d) brake lining wear indicator lamp;
    • e) brake fluid level and parking brake indicator light;
    • f) coolant temperature gauge;
    • h) fuel quantity indicator;
    • j) oil pressure gauge;
    • k) Fuel reserve indicator lamp:
    • l) instrument panel lighting:
    • m) left turn signal control:
    • n) electronic speedometer;
    • o) control of the right turn signal:
    • p) electronic clock;
    • q) electronic tachometer with clock;
    • r) control buzzer.
  • 9. Tempomat switch:
    • A. Disabling:
    • V. Delay/fixation:
    • SP. storage:
    • B. acceleration/fixation.
  • 10. Right headlight:
    • a) high beam;
    • b) low beam;
    • c) parking lighting;
    • d) fog light;
    • e) direction indicator and hazard warning lights.
  • 11. Temperature control device.
  • 12. Parking brake indicator lamp switch.
  • 13. Interior lighting with switch, front.
  • 14. Contact switch in the door, front left.
  • 15. Contact switch in the door, front right.
  • 16. Washer nozzle heater, left.
  • 17. Washer nozzle heater, right.
  • 18. Two-tone sound signal.
  • 19. Turn signal and hazard warning relay.
  • 20. Glove compartment light switch.
  • 21. Glove compartment lighting.
  • 22. Cigarette lighter with lighting.
  • 23. Radio receiver.
  • 24. Temperature control device.
  • 25. Ventilation of the float chamber.
  • 26. Brake light switch.
  • 27. Temperature switch 25°C.
  • 28. Heating coil of the starting device cover.
  • 29. Idle speed cut-off valve.
  • 30. Idle speed cut-off valve.
  • 31. Additional resistance 1.8 Ohm.
  • 32. Fuse box.
  • 33. Hazard warning switch.
  • 34. Sound signal contact.
  • 35. Combination switch:
    • a) direction indicator switch;
    • b) switch for short-term switching on of light ("blinking");
    • c) low beam switch;
    • d) windshield washer switch;
    • e) windshield wiper speed switch;
    • I. intermittent mode;
    • II. slow work;
    • III. fast work.
  • 36. Windscreen wiper motor.
  • 37. Electronic device for adjusting the windshield wiper speed.
  • 38. Relay of additional resistance of the heating coil of the starting device cover.
  • 39. Relay I electric window lifter.
  • 40. Relay II electric window lifter.
  • 41. Door contact switch for electric window.
  • 42. Sunroof motor.
  • 43. Sunroof drive switch.
  • 44. Rotary light switch.
  • 45. Ignition switch.
  • 46. Right temperature regulator of automatic heating.
  • 47. Right temperature sensor of the heating automation heat exchanger.
  • 48. Internal temperature sensor for heating automation.
  • 49. Motor of the heating automation system blower fan.
  • 50. Group of additional resistances of the heating automation system.
  • 51. Air flow switch/blower switch.
  • 52. Double valve for hot coolant.
  • 53. Left temperature sensor of the heating automation heat exchanger.
  • 54. Left temperature regulator for heating automation.
  • 55. Air conditioning temperature controller.


  • Article was borrowed from the website (MERCEDESMAN.ru)


  • 56. Air conditioning temperature sensor.
  • 57. Automatic antenna.
  • 58. Speed stabilization shut-off valve.
  • 59. Automatic transmission magnetic valve.
  • 60. "KICK-DOWN" switch (engaging a lower gear on an automatic transmission when the gas pedal is pressed sharply).
  • 61. Starter interlock and reversing light switch.
  • 62. Electronic speedometer sensor.
  • 63. Climate control relay.
  • 64. Main air damper shut-off valve.
  • 65. Ignition coil.
  • 66. Electric window motor, rear left.
  • 67. Heating automation control device.
  • 68. Window lift switch, rear left.
  • 69. Combined window lift switch:
    • a) rear left window switch:
    • b) safety switch;
    • c) front left window switch;
    • d) front right window switch;
    • e) rear right window switch.
  • 70. Front left window lift motor.
  • 71. Additional resistance 0.6 Ohm.
  • 72. Right headlight wiper motor.
  • 73. Left headlight wiper motor.
  • 74. Washer pump.
  • 75. Temperature switch 62°C of the liquid reservoir in the air conditioning system.
  • 76. Temperature switch 110°C.
  • 77. Additional fan.
  • 78. Additional fan relay.
  • 79. Headlight wiper system relay.
  • 80. Headlight wiper washer pump.
  • 81. Additional resistance 0.4 Ohm.
  • 82. Window lift motor, front right.
  • 83. Contactless ignition distributor and spark plugs.
  • 84. Rear right window switch.
  • 85. Window lift motor, rear right.
  • 86. Ignition system switch.
  • 87. Diagnostic socket.
  • 88. TDC sensor.
  • 89. Plug connection of the rear light wiring harness.
  • 90. Heated rear window time relay.
  • 91. Heated rear window switch.
  • 92. Electromagnetic clutch of the air conditioning compressor.
  • 93. Compressor switch - on 2.6 bar; switch-off 2.0 bar.
  • 94. Alternator with electronic regulator.
  • 95. Battery.
  • 96. Starter.
  • 97. Right rear light:
    • a) direction indicator and hazard warning lights;
    • b) brake light;
    • c) parking/side lights:
    • d) reversing light.
  • 98. Contact switch in the door, rear right.
  • 99. Interior light switch, rear.
  • 100. Contact switch in the door, rear left.
  • 101. Interior lighting, rear.
  • 102. Fuel gauge sensor.
  • 103. Heated rear window.
  • 104. Trunk lighting.
  • 105. License plate lighting.
  • 106. Left rear light:
    • a) direction indicator and hazard warning lights;
    • b) brake light;
    • c) parking/side lights:
    • d) reversing light;
    • c) rear fog light.
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S-Class W126 / Electrical circuits
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Electrical diagram of a 6-cylinder carburetor engine
Electrical diagram of the 8-cylinder engine with injection
Explanations of the electrical equipment diagram with an 8-cylinder engine with injection
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