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).)
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