What does connector 18M in the engine compartment main harness connect to?

18M is a diode. Its inset diagram shows connections to the brake level switch/parking brake switch, the auto choke relay, and the brake warning lamp, with two terminals marked 'NOT USED'.

What is the resistor (33M) in the engine harness for and what is its value?

The 33M resistor is a 2.2 kΩ resistor wired between the ignition coil and the tachometer.

Which relay colors are identified in this harness layout?

The automatic choke relay (16M) is Gray and the heater relay (17M) is Blue.

Where does connector 25M go?

25M goes to the back-up lamp switch on M/T (manual transmission) models; 26M is the battery cable connection on A/T (automatic) models.

What is connector 14M?

14M is the fusible link, located near 15M, which goes to the battery cable.

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Nissan Micra Engine Compartment Main Harness Layout Diagram (EL-62)

Main harness layout for the engine compartment with numbered connector callouts

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Main wiring harness layout for the engine compartment showing routing and numbered connector callouts.

AI caption February 2006 · Photo 408 of 412

This document is a scanned page (EL-62) from a factory service manual showing the 'Harness Layout — Main Harness' for the engine compartment. It presents an isometric line drawing of the engine compartment main wiring harness with numbered connector callouts (1M through 33M), each keyed to a legend identifying the component the connector serves. Components include the front and rear washer motors, headlamps, front side marker and turn signal lamps, alternator, radiator fan motor, horn, body ground, fusible link, battery cable connections, automatic choke relay (Gray), heater relay (Blue), diode, ignition coil, condenser, brake fluid level switch, intermittent wiper amplifier, wiper motor, back-up lamp switch (M/T models), battery cable (A/T models), power steering switch, thermal transmitter, oil pressure switch harness, idle speed control solenoid valve, throttle opener solenoid, auto-choke heater/anti-dieseling solenoid, and a resistor. Two inset detail diagrams show the diode (18M) connections — to brake level switch/parking brake switch, auto choke relay, and brake warning lamp — and the resistor (33M), a 2.2 kΩ unit wired between the ignition coil and tachometer. The figure reference is SEL529I. A reader can locate each engine-compartment connector and identify its function from this page.

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Frequently asked questions

What does connector 18M in the engine compartment main harness connect to?: 18M is a diode. Its inset diagram shows connections to the brake level switch/parking brake switch, the auto choke relay, and the brake warning lamp, with two terminals marked 'NOT USED'.
What is the resistor (33M) in the engine harness for and what is its value?: The 33M resistor is a 2.2 kΩ resistor wired between the ignition coil and the tachometer.
Which relay colors are identified in this harness layout?: The automatic choke relay (16M) is Gray and the heater relay (17M) is Blue.
Where does connector 25M go?: 25M goes to the back-up lamp switch on M/T (manual transmission) models; 26M is the battery cable connection on A/T (automatic) models.
What is connector 14M?: 14M is the fusible link, located near 15M, which goes to the battery cable.