What fuse powers the heater blower motor circuit?

The wiring diagram shows a 20A fuse in the fuse block, fed from the ignition switch in ACC or ON, with an OR/B wire running to the blower circuit.

Which fan switch terminals are connected at each blower speed?

Per the continuity chart, terminals 5 and 4 are connected at all speeds 1–4. Additionally, terminal 1 is connected at speed 1, terminal 2 at speed 2, terminal 8 at speed 3, and terminal 3 at speed 4. No terminals are connected in OFF.

When does the heater control illumination lamp receive power?

The illumination lamp chart shows terminals 6 and 7 are energized when the lighting switch is in the 1ST or 2ND position, and off when the lighting switch is OFF.

What wire colors are used in the heater circuit?

Colors shown include OR/B (fuse feed), L/B, B, G/W, L, L/R, R/W, and L/Y, with connectors labeled 63M, 64M, and 62M.

Is the ILL. connection on the fan switch used?

No — the diagram labels the ILL. connection near connector 64M as '(Not used)'.

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Nissan Micra Heater Wiring Diagram & Blower Fan Switch Continuity Chart (HA-6)

Heater electrical circuit wiring diagram with blower motor, fan switch resistor and fan-switch position chart

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Heater electrical circuit: ignition switch, fuse block, blower motor, fan switch and resistor, plus fan-switch terminal-continuity chart for OFF/1/2/3/4 positions.

AI caption February 2006 · Photo 347 of 412

This is page HA-6 of a Nissan factory service manual, covering the Heater Electrical Circuit. The top half presents the heater wiring diagram, showing power flow from the ignition switch (ACC or ON position) through a 20A fuse in the fuse block (wire color OR/B) to the blower motor, fan switch, and blower resistor. Wire color codes shown include OR/B, L/B, B, G/W, L, L/R, R/W, and L/Y, with harness connectors labeled 63M, 64M, and 62M. An illumination (ILL.) circuit is marked '(Not used)', and leads route to the lighting switch and illumination control switch. The diagram carries reference number RHA677. The bottom half is the Fan Switch section, containing a continuity chart showing which switch terminals (5, 1, 2, 8, 3, 4) are connected at each lever position (OFF, 1, 2, 3, 4): terminals 5 and 4 are live in all speeds, with terminal 1, 2, 8, or 3 added at speeds 1–4 respectively. A second small chart covers the illumination lamp, showing terminals 6 and 7 energized when the lighting switch is in 1ST or 2ND position. An exploded illustration identifies the connector terminal locations (callouts 1–8) on the heater control assembly. Reference RHA680.

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Frequently asked questions

What fuse powers the heater blower motor circuit?: The wiring diagram shows a 20A fuse in the fuse block, fed from the ignition switch in ACC or ON, with an OR/B wire running to the blower circuit.
Which fan switch terminals are connected at each blower speed?: Per the continuity chart, terminals 5 and 4 are connected at all speeds 1–4. Additionally, terminal 1 is connected at speed 1, terminal 2 at speed 2, terminal 8 at speed 3, and terminal 3 at speed 4. No terminals are connected in OFF.
When does the heater control illumination lamp receive power?: The illumination lamp chart shows terminals 6 and 7 are energized when the lighting switch is in the 1ST or 2ND position, and off when the lighting switch is OFF.
What wire colors are used in the heater circuit?: Colors shown include OR/B (fuse feed), L/B, B, G/W, L, L/R, R/W, and L/Y, with connectors labeled 63M, 64M, and 62M.
Is the ILL. connection on the fan switch used?: No — the diagram labels the ILL. connection near connector 64M as '(Not used)'.