ELECTRICAL SUPPLY UNIT (ESU) INSPECTION

id094000003700

L.H.D

1. Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.)

2. Remove the following parts:

(1) Selector lever knob (AT) (See AUTOMATIC TRANSMISSION SHIFT MECHANISM REMOVAL/INSTALLATION.)

(2) Shift lever knob (MT)

(3) Shift panel component (See SHIFT PANEL REMOVAL/INSTALLATION.)

(4) Upper panel (See UPPER PANEL REMOVAL/INSTALLATION.)

(5) Parking brake lever boot panel (See PARKING BRAKE LEVER BOOT PANEL REMOVAL/INSTALLATION.)

(6) Rear console (See REAR CONSOLE REMOVAL/INSTALLATION.)

(7) Front console panel (See FRONT CONSOLE PANEL REMOVAL/INSTALLATION.)

(8) Front console component (See FRONT CONSOLE REMOVAL/INSTALLATION.)

(9) Driver-side seat (See SEAT REMOVAL/INSTALLATION.)

(10) Driver-side scuff plate (See SCUFF PLATE REMOVAL/INSTALLATION.)

(11) Driver-side tire house trim (See TIRE HOUSE TRIM REMOVAL/INSTALLATION.)

(12) Driver-side seat belt lower anchor installation bolt (without lap pre-tensioner seat belts) (See SEAT BELT REMOVAL/INSTALLATION.)

(13) Driver-side lap pre-tensioner lower anchor cover (with lap pre-tensioner seat belts) (See SEAT BELT REMOVAL/INSTALLATION.)

(14) Driver-side lap pre-tensioner lower anchor installation bolt (with lap pre-tensioner seat belts) (See SEAT BELT REMOVAL/INSTALLATION.)

(15) Accelerator pedal (See ACCELERATOR PEDAL REMOVAL/INSTALLATION [SKYACTIV-G 1.5, SKYACTIV-G 2.0].)

(16) 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.

R.H.D

1. Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.)

2. Remove the following parts:

(1) Passenger-side scuff plate (See SCUFF PLATE REMOVAL/INSTALLATION.)

(2) Passenger-side front side trim (See FRONT SIDE TRIM REMOVAL/INSTALLATION.)

(3) Passenger-side A-pillar trim (See A-PILLAR TRIM REMOVAL/INSTALLATION.)

(4) Passenger-side lower panel (See PASSENGER-SIDE LOWER PANEL REMOVAL/INSTALLATION.)

(5) Selector lever knob (AT) (See AUTOMATIC TRANSMISSION SHIFT MECHANISM REMOVAL/INSTALLATION.)

(6) Shift lever knob (MT)

(7) Shift panel component (See SHIFT PANEL REMOVAL/INSTALLATION.)

(8) Upper panel (See UPPER PANEL REMOVAL/INSTALLATION.)

(9) Parking brake lever boot panel (See PARKING BRAKE LEVER BOOT PANEL REMOVAL/INSTALLATION.)

(10) Rear console (See REAR CONSOLE REMOVAL/INSTALLATION.)

(11) Front console panel (See FRONT CONSOLE PANEL REMOVAL/INSTALLATION.)

(12) Front console component (See FRONT CONSOLE REMOVAL/INSTALLATION.)

(13) Front cup holder bracket (See FRONT CUP HOLDER BRACKET REMOVAL/INSTALLATION.)

(14) Foot support (See FRONT CUP HOLDER BRACKET REMOVAL/INSTALLATION.)

(15) Woofer (See FRONT CUP HOLDER BRACKET REMOVAL/INSTALLATION.)

(16) 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.

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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

•  Door latch and lock actuator (LH)

•  Fuel-filler lid lock actuator

Driver's door lock switch or fuel-filler lid lock actuator is unlocked

1.0 or less → Approx. 10 → 1.0 or less

•  Door latch and lock actuator (LH)

•  Fuel-filler lid lock actuator

Conditions other than above

1.0 or less

1C

Door lock control

•  Door latch and lock actuator (LH), (RH)

•  Fuel-filler lid lock actuator

Driver's door lock switch or fuel-filler lid lock actuator is locked

1.0 or less → Approx. 10 → 1.0 or less

•  Door latch and lock actuator (LH), (RH)

•  Fuel-filler lid lock actuator

Conditions other than above

1.0 or less

1D

Taillight, license plate light, rear side marker light control

•  License plate light (LH), (RH)

•  Taillight (LH)

•  Rear side marker light (LH)

Ignition is switched ON (engine off or on)

Light switch is in TNS (Parking Lights) position

B+

•  License plate light (LH), (RH)

•  Taillight (LH)

•  Rear side marker light (LH)

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

•  Taillight (RH)

•  Rear side marker light (RH)

Ignition is switched ON (engine off or on)

Light switch is in TNS (Parking Lights) position

B+

•  Taillight (RH)

•  Rear side marker light (RH)

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^*1

Rear fog light relay control

Rear fog light

Ignition is switched ON (engine off or on)

Rear fog light switch is on

1.0 or less

Rear fog light

Rear fog light switch is off

B+

2D

Interior illumination power supply

•  Steering switch

•  Commander switch^*2

•  Audio unit^*3

•  CD player^*4

•  DVD/CD player^*5

•  Hazard warning switch

•  Shift panel (indicator)

•  Drive selection switch^*6

•  Cruise control switch

Ignition is switched ON (engine off or on)

Light switch is in ON position

B+

•  Steering switch

•  Commander switch^*2

•  Audio unit^*3

•  CD player^*4

•  DVD/CD player^*5

•  Hazard warning switch

•  Shift panel (indicator)

•  Drive selection switch^*6

•  Cruise control switch

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

•  INTERIOR 15 A fuse

•  ROOM 25 A fuse

Under any condition

B+

•  INTERIOR 15 A fuse

•  ROOM 25 A fuse

2Q

Back-up light control

•  Back-up light (LH), (RH)

•  Auto-dimming mirror

Ignition is switched ON (engine off or on)

Selector lever is in R position

B+

•  Back-up light (LH), (RH)

•  Auto-dimming mirror

Conditions other than above

1.0 or less

2R

Power supply

•  R.WIPER 15 A fuse

•  CABIN+B 50 A fuse

Under any condition

B+

•  R.WIPER 15 A fuse

•  CABIN+B 50 A fuse

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

•  Front combination light (RH)

•  Front side marker light (RH)

Ignition is switched ON (engine off or on)

Light switch is in parking light position

B+

•  Front combination light (RH)

•  Front side marker light (RH)

Light switch is in position other than parking light position

1.0 or less

4H

—

—

—

—

—

4I

Parking light (LH) control

•  Front combination light (LH)

•  Front side marker light (LH)

Ignition is switched ON (engine off or on)

Light switch is in parking light position

B+

•  Front combination light (LH)

•  Front side marker light (LH)

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

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	• Door latch and lock actuator (LH) • Fuel-filler lid lock actuator	Driver's door lock switch or fuel-filler lid lock actuator is unlocked	1.0 or less → Approx. 10 → 1.0 or less	• Door latch and lock actuator (LH) • Fuel-filler lid lock actuator
Conditions other than above	1.0 or less
1C	Door lock control	• Door latch and lock actuator (LH), (RH) • Fuel-filler lid lock actuator	Driver's door lock switch or fuel-filler lid lock actuator is locked	1.0 or less → Approx. 10 → 1.0 or less	• Door latch and lock actuator (LH), (RH) • Fuel-filler lid lock actuator
Conditions other than above	1.0 or less
1D	Taillight, license plate light, rear side marker light control	• License plate light (LH), (RH) • Taillight (LH) • Rear side marker light (LH)	Ignition is switched ON (engine off or on)	Light switch is in TNS (Parking Lights) position	B+	• License plate light (LH), (RH) • Taillight (LH) • Rear side marker light (LH)
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	• Taillight (RH) • Rear side marker light (RH)	Ignition is switched ON (engine off or on)	Light switch is in TNS (Parking Lights) position	B+	• Taillight (RH) • Rear side marker light (RH)
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^*1	Rear fog light relay control	Rear fog light	Ignition is switched ON (engine off or on)	Rear fog light switch is on	1.0 or less	Rear fog light
Rear fog light switch is off	B+
2D	Interior illumination power supply	• Steering switch • Commander switch^2 • Audio unit^3 • CD player^4 • DVD/CD player^5 • Hazard warning switch • Shift panel (indicator) • Drive selection switch^*6 • Cruise control switch	Ignition is switched ON (engine off or on)	Light switch is in ON position	B+	• Steering switch • Commander switch^2 • Audio unit^3 • CD player^4 • DVD/CD player^5 • Hazard warning switch • Shift panel (indicator) • Drive selection switch^*6 • Cruise control switch
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	• INTERIOR 15 A fuse • ROOM 25 A fuse	Under any condition	B+	• INTERIOR 15 A fuse • ROOM 25 A fuse
2Q	Back-up light control	• Back-up light (LH), (RH) • Auto-dimming mirror	Ignition is switched ON (engine off or on)	Selector lever is in R position	B+	• Back-up light (LH), (RH) • Auto-dimming mirror
Conditions other than above	1.0 or less
2R	Power supply	• R.WIPER 15 A fuse • CABIN+B 50 A fuse	Under any condition	B+	• R.WIPER 15 A fuse • CABIN+B 50 A fuse
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	• Front combination light (RH) • Front side marker light (RH)	Ignition is switched ON (engine off or on)	Light switch is in parking light position	B+	• Front combination light (RH) • Front side marker light (RH)
Light switch is in position other than parking light position	1.0 or less
4H	—	—	—	—	—
4I	Parking light (LH) control	• Front combination light (LH) • Front side marker light (LH)	Ignition is switched ON (engine off or on)	Light switch is in parking light position	B+	• Front combination light (LH) • Front side marker light (LH)
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 rear fog light

*2 :With center display

*3 :Without center display

*4 :With CD player

*5 :With DVD/CD player

*6 :With drive selection system