ELECTRICAL SUPPLY UNIT (ESU) INSPECTION
2016 – MX-5 – Body and Accessories
ELECTRICAL SUPPLY UNIT (ESU) INSPECTION
1. Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.)
2. Remove the following parts:
a. Selector lever knob (AT) (See AUTOMATIC TRANSMISSION SHIFT MECHANISM REMOVAL/INSTALLATION.)
b. Shift lever knob (MT)
c. Shift panel component (See SHIFT PANEL REMOVAL/INSTALLATION.)
d. Upper panel (See UPPER PANEL REMOVAL/INSTALLATION.)
e. Parking brake lever boot panel (See PARKING BRAKE LEVER BOOT PANEL REMOVAL/INSTALLATION.)
f. Rear console (See REAR CONSOLE REMOVAL/INSTALLATION.)
g. Front console panel (See FRONT CONSOLE PANEL REMOVAL/INSTALLATION.)
h. Front console component (See FRONT CONSOLE REMOVAL/INSTALLATION.)
i. Driver-side scuff plate (See SCUFF PLATE REMOVAL/INSTALLATION.)
j. Driver-side front side trim (See FRONT SIDE TRIM REMOVAL/INSTALLATION.)
k. Driver-side A-pillar trim (See A-PILLAR TRIM REMOVAL/INSTALLATION.)
l. Hood release lever (See HOOD RELEASE LEVER AND RELEASE CABLE REMOVAL/INSTALLATION.)
m. Driver-side lower panel (See DRIVER-SIDE LOWER PANEL REMOVAL/INSTALLATION.)
n. Accelerator pedal (See ACCELERATOR PEDAL REMOVAL/INSTALLATION [SKYACTIV-G 2.0].)
o. Electrical supply unit (ESU) (See ELECTRICAL SUPPLY UNIT (ESU) REMOVAL/INSTALLATION.)
3. Connect the Electrical supply unit (ESU) connector.
4. Connect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.)
5. Verify that the voltages of each of the terminals are as indicated in the terminal voltage table (reference). (See Terminal Voltage Table (Reference).)
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If the voltage is not as specified in the terminal voltage table (reference), inspect the parts under Inspection item(s) and related wiring harnesses.
-
If the system does not work normally even though the inspection items are normal, identify the malfunctioning location according to the directions in [DIAGNOSTIC SYSTEM] and [SYMPTOM TROUBLESHOOTING] then perform repairs.
Terminal Voltage Table (Reference)
|
Terminal |
Signal |
Connected to |
Measurement condition |
Voltage (V) |
Inspection item(s) |
|
|
1A |
Ground |
Body ground |
Under any condition |
1.0 or less |
Body ground |
|
|
1B |
Door unlock control |
|
Driver’s door lock switch or fuel-filler lid lock actuator is unlocked |
1.0 or less ??? Approx. 10 ??? 1.0 or less |
|
|
|
Conditions other than above |
1.0 or less |
|||||
|
1C |
Door lock control |
|
Driver’s door lock switch or fuel-filler lid lock actuator is locked |
1.0 or less ??? Approx. 10 ??? 1.0 or less |
|
|
|
Conditions other than above |
1.0 or less |
|||||
|
1D |
Taillight, license plate light, rear side marker light control |
|
Ignition is switched ON (engine off or on) |
Light switch is in TNS (Parking Lights) position |
B+ |
|
|
Light switch is in OFF position |
1.0 or less |
|||||
|
1E |
2-step unlocking system control |
Door latch and lock actuator (LH), (RH) |
Press remote transmitter unlock button two times (2-step unlocking system operation condition) |
1.0 or less ??? Approx. 10 ??? 1.0 or less |
Door latch and lock actuator (LH), (RH) |
|
|
Conditions other than above |
1.0 or less |
|||||
|
1F |
??? |
??? |
??? |
??? |
??? |
|
|
1G |
E latch motor control |
Trunk lid latch and release actuator |
Trunk is open |
1.0 or less ??? Approx. 10 ??? 1.0 or less |
Trunk lid latch and release actuator |
|
|
Trunk is close |
1.0 or less |
|||||
|
1H |
Ignition power supply |
METER1 10 A fuse |
Ignition is switched ON (engine off or on) |
B+ |
METER1 10 A fuse |
|
|
The ignition is switched off (LOCK) |
1.0 or less |
|||||
|
2A |
Taillight, rear side marker light control |
|
Ignition is switched ON (engine off or on) |
Light switch is in TNS (Parking Lights) position |
B+ |
|
|
Light switch is in OFF position |
1.0 or less |
|||||
|
2B |
Power supply |
TAIL 20 A fuse |
Under any condition |
B+ |
TAIL 20 A fuse |
|
|
2C |
??? |
??? |
??? |
??? |
??? |
|
|
2D |
Interior illumination power supply |
|
Ignition is switched ON (engine off or on) |
Light switch is in ON position |
B+ |
|
|
Light switch is in OFF position |
Voltage changes according to the tester specification, therefore determination is not possible. |
|||||
|
2E |
??? |
??? |
??? |
??? |
??? |
??? |
|
2F |
Trunk compartment light power supply |
Trunk compartment light |
Ignition is switched ON (engine off or on) and trunk compartment light switched on |
Trunk is opened |
1.0 or less |
Trunk compartment light |
|
Trunk is closed |
B+ |
|||||
|
2G |
Ground |
Body ground |
Under any condition |
1.0 or less |
Body ground |
|
|
2H |
Serial communication |
SAS control module |
Terminal used for communication therefore determination based on terminal voltage is not possible. |
|||
|
2I |
LIN communication |
Body control module (BCM) |
Terminal used for communication therefore determination based on terminal voltage is not possible. |
|||
|
2J |
??? |
??? |
??? |
??? |
??? |
|
|
2K |
??? |
??? |
??? |
??? |
??? |
|
|
2L |
Map light power supply |
Map light |
Ignition is switched ON (engine off or on) |
Interior light switch is in DOOR position and door is open |
1.0 or less |
Map light |
|
Interior light switch is in DOOR position and door is closed |
B+ |
|||||
|
2M |
??? |
??? |
??? |
??? |
??? |
??? |
|
2N |
??? |
??? |
??? |
??? |
??? |
|
|
2O |
??? |
??? |
??? |
??? |
??? |
|
|
2P |
Power supply |
|
Under any condition |
B+ |
|
|
|
2Q |
Back-up light control |
|
Ignition is switched ON (engine off or on) |
Selector lever is in R position |
B+ |
|
|
Conditions other than above |
1.0 or less |
|||||
|
2R |
Power supply |
|
Under any condition |
B+ |
|
|
|
3A |
Headlight high-beam control |
Front combination light (RH) |
Ignition is switched ON (engine off or on) |
Light switch is in high-beam position |
B+ |
Front combination light (RH) |
|
Light switch is in position other than high-beam position |
1.0 or less |
|||||
|
3B |
Power supply |
H/L RH 20 A fuse |
Under any condition |
B+ |
H/L RH 20 A fuse |
|
|
3C |
Headlight low-beam control |
Front combination light (RH) |
Ignition is switched ON (engine off or on) |
Light switch is in low-beam position |
B+ |
Front combination light (RH) |
|
Light switch in OFF position |
1.0 or less |
|||||
|
3D |
Power supply |
D.LOCK 25 A fuse |
Under any condition |
B+ |
D.LOCK 25 A fuse |
|
|
4A |
Headlight high-beam control |
Front combination light (LH) |
Ignition is switched ON (engine off or on) |
Light switch is in high-beam position |
B+ |
Front combination light (LH) |
|
Light switch is in position other than high-beam position |
1.0 or less |
|||||
|
4B |
Front washer motor control |
Washer motor |
Ignition is switched ON (engine off or on) |
Front washer switch is on |
B+ |
Windshield wiper motor |
|
Front washer switch is off |
1.0 or less |
|||||
|
4C |
Power supply |
H/L LH 20 A fuse |
Under any condition |
B+ |
H/L LH 20 A fuse |
|
|
4D |
??? |
??? |
??? |
??? |
??? |
|
|
4E |
Headlight low-beam control |
Front combination light (LH) |
Ignition is switched ON (engine off or on) |
Light switch is in low-beam position |
B+ |
Front combination light (LH) |
|
Light switch in OFF position |
1.0 or less |
|||||
|
4F |
??? |
??? |
??? |
??? |
??? |
|
|
4G |
Parking light (RH) control |
|
Ignition is switched ON (engine off or on) |
Light switch is in parking light position |
B+ |
|
|
Light switch is in position other than parking light position |
1.0 or less |
|||||
|
4H |
??? |
??? |
??? |
??? |
??? |
|
|
4I |
Parking light (LH) control |
|
Ignition is switched ON (engine off or on) |
Light switch is in parking light position |
B+ |
|
|
Light switch is in position other than parking light position |
1.0 or less |
|||||
|
4J |
Running light control |
Front combination light (LH), (RH) |
Ignition is switched ON (engine off or on) |
Running light illuminates |
B+ |
Front combination light (LH), (RH) |
|
Running light turns off |
1.0 or less |
|||||
- *1
- With center display
- *2
- Without center display
- *3
- With drive selection system