Master parts-location diagram showing where every wiring-related sensor, relay, control unit, and switch is mounted on the MX-5. Engine bay (front-left of the figure) hosts the relay & main fuse block, main relay, igniter, cooling fan relay, water thermosensor, crank angle sensor, airflow meter, oxygen sensor, throttle sensor, idle-speed-control solenoid valve, purge solenoid valve, A/C relay, hydraulic unit (ABS), condenser, brake fluid level sensor, oil pressure sensor, water thermoswitch (fan), retractor relay, headlight relay (Federal & California), blower motor relay (Federal & California), TNS relay (M/T and A/T variants), kick-down relay (M/T), D sensors (right/center/left for ABS), speed sensors (front LH/RH for ABS), and diagnosis connector. Behind the dashboard: cruise control unit, fuse box, S sensor, backup battery, air bag control unit, turn signal & hazard flasher, horn relay, timer & buzzer, AT control unit, ABS control unit, engine control unit, circuit opening relay. A/T inset (top right) shows kickdown solenoid, oil pressure sensor, OD cancel solenoid, lockup solenoid, inhibitor switch, and back-up light switch. CANADA inset shows the daytime running light (DRL) control unit location. Pedal box: clutch switch (M/T), starter interlock switch, brake switch (with cruise control), stoplight switch.
1COOLING FAN RELAY(Engine bay top)
2WATER THERMOSENSOR(Engine bay)
3RELAY & MAIN FUSE BLOCK(Driver-side engine bay)
4CRANK ANGLE SENSOR(Engine front)
5MAIN RELAY(Relay block)
6AIRFLOW METER(Engine intake)
7HYDRAULIC UNIT(ABS hydraulic unit)
8OXYGEN SENSOR(Exhaust manifold)
9CONDENSER(Front of car)
10ACTUATOR (WITH CRUISE CONTROL)(Engine bay)
11IGNITER(Engine bay)
12NEUTRAL SWITCH (M/T)(Transmission)
13SOLENOID VALVE (PURGE)(Engine bay)
14BACK-UP LIGHT SWITCH (M/T)(Transmission)
15KICKDOWN SOLENOID(A/T transmission (AT inset))
16OIL PRESSURE SENSOR (AT)(A/T inset)
17OD CANCEL SOLENOID(A/T inset)
18LOCKUP SOLENOID(A/T inset)
19INHIBITOR SWITCH(A/T inset)
20BACK-UP LIGHT SWITCH (A/T)(A/T inset)
21SPEED SENSOR FRONT RH(Right-front wheel hub (ABS))
22BRAKE FLUID LEVEL SENSOR(Master cylinder reservoir)
23TNS RELAY (FEDERAL & CALIFORNIA M/T)(Relay block)
24KICK DOWN RELAY (M/T)(Relay block)
25D SENSOR (RIGHT)(ABS right)
26RETRACTOR RELAY(Retractor relay)
27A/C RELAY(Relay block)
28HEADLIGHT RELAY (FEDERAL & CALIFORNIA)(Relay block)
29BLOWER MOTOR RELAY (FEDERAL & CALIFORNIA)(Behind dashboard)
30DIAGNOSIS CONNECTOR(Engine bay)
31TNS RELAY (FEDERAL & CALIFORNIA A/T)(Relay block)
32THROTTLE SENSOR(Throttle body)
33SPEED SENSOR FRONT LH(Left-front wheel hub (ABS))
34SOLENOID VALVE (IDLE SPEED CONTROL)(Intake manifold)
35D SENSOR (CENTER)(ABS center)
36S SENSOR(Steering sensor)
37BACKUP BATTERY(Behind dashboard)
38AIR BAG CONTROL UNIT(Behind dashboard (SRS))
39WATER THERMOSWITCH (FAN)(Engine cooling)
40OIL PRESSURE SENSOR(Engine block)
41TURN SIGNAL & HAZARD FLASHER UNIT(Behind dashboard)
42HORN RELAY(Behind dashboard)
43D SENSOR (LEFT)(ABS left)
44TIMER & BUZZER UNIT(Behind dashboard)
45AT CONTROL UNIT(Behind dashboard (A/T))
46ABS CONTROL UNIT(Behind dashboard (ABS))
47CIRCUIT OPENING RELAY(Behind dashboard)
48ENGINE CONTROL UNIT(Behind dashboard (passenger side))
49CRUISE CONTROL UNIT(Behind dashboard)
50FUSE BOX(Driver-side kick panel)
51CANADA(Canada-specific layout inset)
52DAYTIME RUNNING LIGHT (DRL) CONTROL UNIT(Canada inset)
53CLUTCH SWITCH (M/T)(Pedal box (M/T))
54STOPLIGHT SWITCH(Brake pedal)
55STARTER INTERLOCK SWITCH(Pedal box)
56BRAKE SWITCH (WITH CRUISE CONTROL)(Brake pedal)
