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2008 - MX-5 - Body and Accessories

KEYLESS CONTROL MODULE INSPECTION [KEYLESS ENTRY SYSTEM]

1. Measure the voltage or inspect for continuity according to the Terminal Voltage Table (Reference).

Terminal Voltage Table (Reference)



Terminal

Signal name

Connected to

Measured condition

Voltage (V)/Continuity

Inspection item(s)

1A

Door unlock control

Door lock actuator (driver’s side)

Door lock actuator unlocking

1.0 or less → B+ → 1.0 or less

  • Door lock actuator (driver’s side)

  • Related wiring harnesses

Other

1.0 or less

1B

GND

GND

Under any condition: Inspect for continuity to GND.

Continuity detected

  • Related wiring harnesses

1C

Door lock control

Door lock actuator

Door lock actuator locking

1.0 or less → B+ → 1.0 or less

  • Door lock actuator

  • Related wiring harnesses

Other

1.0 or less

1D

Door unlock control

Door lock actuator (except driver’s side)

Door lock actuator unlocking

1.0 or less → B+ → 1.0 or less

  • Door lock actuator (except driver’s side)

  • Related wiring harnesses

Other

1.0 or less

1E

Power supply

D.LOCK 20 A fuse

Under any condition

B+

  • D.LOCK 20 A fuse

  • Battery

1F

Power supply

ROOM 15 A fuse

Under any condition

B+

  • ROOM 15 A fuse

  • Battery

3B

IG1

METER 15 A fuse

Ignition switch is at ON position

B+

METER 15 A fuse

Ignition switch is at LOCK or ACC position

1.0 or less

3C

GND

body ground

Under any condition: Inspect for continuity to ground.

Continuity detected

GND

3F

Security light

Instrument cluster

Under any condition: Inspect for continuity to instrument cluster.

Continuity detected

Instrument cluster

3O

Key reminder switch

Steering lock unit

Key reminder switch is ON

B+

Steering lock unit

Other

1.0 or less

3R

TPMS signal

Instrument cluster

Under any condition: Inspect for continuity to instrument cluster.

Continuity detected

Instrument cluster

3S

Power supply (keyless receiver)

Keyless receiver

Under any condition

B+

Keyless receiver

3U

Communication (keyless receiver)

Keyless receiver

Under any condition: Inspect for continuity to keyless receiver.

Continuity detected

Keyless receiver

3Z

Trunk open signal

Trunk compartment light switch

Trunk lid open

(trunk compartment light switch on)

1.0 or less

  • Trunk compartment light switch

  • Related wiring harnesses

Trunk lid closed

(trunk compartment light switch off)

B+

4B

Lock/unlock input

Door lock switch

Door lock switch is locked

2.5

  • Door lock switch (driver-side)

  • Door lock switch (passenger-side)

  • Related wiring harnesses

Door lock switch is unlocked

1.0 or less

Other

5

4E

Lock signal input

Door lock-link switch (driver-side)

Driver-side door is locked: Inspect for continuity to ground.

Continuity detected

Door lock-link switch (driver-side)

Driver-side door is unlocked: Inspect for continuity to ground.

No continuity

4G

Lock/unlock input

Driver-side door key cylinder switch

At the moment key cylinder is locked

2.5

  • Driver-side door key cylinder switch

  • Related wiring harnesses

At the moment key cylinder is unlocked

1.0 or less

At the moment key cylinder is neutral position

5

4I

Unlock signal input

Door lock-link switch (driver-side)

Driver-side door is unlocked: Inspect for continuity to ground.

Continuity detected

Door lock-link switch (driver-side)

Driver-side door is locked: Inspect for continuity to ground.

No continuity

4K

Unlock input (trunk lid)

Trunk key cylinder switch

At the moment key cylinder is unlocked

1.0 or less

  • Trunk key cylinder switch

  • Related wiring harnesses

At the moment key cylinder is neutral position

5

4N

Hazard output

Hazard warning light

Press the LOCK button (transmitter)

B+→1.0 or less→B+

  • Hazard warning light

  • Related wiring harnesses

Press the UNLOCK button (transmitter)

B+→1.0 or less→B+→1.0 or less→B+

Other

B+

4P

Trunk open output

Trunk opener relay

Press the trunk open switch

1.0 or less

  • Trunk opener relay

  • Related wiring harnesses

Other

B+

4Q

Door switch signal (RH) output

Door switch

Door open (RH)

(Door switch on)

1.0 or less

  • Door switch (RH)

  • Related wiring harnesses

Door closed (RH)

(Door switch off)

B+

4R

Unlock signal input

Door lock-link switch (passenger-side)

Passenger-side door is unlocked: Inspect for continuity to ground.

Continuity detected

Door lock-link switch (passenger-side)

Passenger-side door is locked: Inspect for continuity to ground.

No continuity

4S*1

Serial communication

Power window main switch

Because this terminal is for communication, good/no good judgment by terminal voltage is not possible.

-

  • Power window main switch

  • Related wiring harnesses

4T

Door switch signal (LH) output

Door switch

Door open (LH)

(Door switch on)

1.0 or less

  • Door switch (LH)

  • Related wiring harnesses

Door closed (LH)

(Door switch off)

B+

4U

Horn on/off

Horn relay

Transmitter LOCK button is pressed twice within 5 s.

B+→1.0 or less→B+

  • Horn relay

  • Related wiring harnesses

Other

B+

4V

Hood switch signal

Hood switch

Hood open

(Hood latch switch off)

B+

  • Hood latch switch

  • Related wiring harnesses

Hood closed

(Hood latch switch on)

1.0 or less


*1
With exterior open function (Power window system)


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