DTC B1D00:13 [ELECTRICAL SUPPLY UNIT (ESU)]

id0902ff062200

Description

Headlight LO (LH) circuit malfunction
Detection condition
•  Electrical supply unit (ESU) detects an open circuit in the headlight LO (LH) circuit.
Fail-safe
Not applicable
Possible cause
•  Electrical supply unit (ESU) connector or terminal malfunction
•  Electrical supply unit (ESU) power supply circuit malfunction
―  Without i-ELOOP:
•  Short to ground in wiring harness between MAIN 200 A fuse and electrical supply unit (ESU) terminal 4C
•  H/L LH 20 A fuse malfunction
•  MAIN 200 A fuse malfunction
•  Open circuit in wiring harness between battery positive terminal and electrical supply unit (ESU) terminal 4C
―  With i-ELOOP:
•  Short to ground in wiring harness between H/L LH 20 A fuse and electrical supply unit (ESU) terminal 4C
•  H/L LH 20 A fuse malfunction
•  Open circuit in wiring harness between DC-DC converter (i-ELOOP) terminal 4A and electrical supply unit (ESU) terminal 4C
•  Headlight HI/LO bulb (LH) malfunction
•  Front combination light (LH) connector or terminal malfunction
•  Open circuit in wiring harness between the following terminals:
―  Front combination light (LH) terminal O—Body ground
•  Open circuit in wiring harness between front combination light (LH) terminal B and electrical supply unit (ESU) terminal 4E
•  Front combination light (LH) malfunction
•  Electrical supply unit (ESU) malfunction

Diagnostic Procedure

Step

Inspection

Action
1
INSPECT ELECTRICAL SUPPLY UNIT (ESU) CONNECTOR CONDITION
•  Switch the ignition off.
•  Disconnect the negative battery terminal.
•  Disconnect the electrical supply unit (ESU) connector.
•  Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection.
•  Is the connector normal?
Yes
Without i-ELOOP:
•  Go to the next step.
With i-ELOOP:
•  Go to Step 3.
No
Repair or replace the connector, then go to Step 9.
2
VERIFY ELECTRICAL SUPPLY UNIT (ESU) POWER SUPPLY VOLTAGE
•  Connect the negative battery terminal.
•  Measure the voltage at the electrical supply unit (ESU) terminal 4C (wiring harness-side).
•  Is the voltage B+?
Yes
With front combination light (bulb type):
•  Go to Step 4.
With front combination light (LED type):
•  Go to Step 5.
No
Inspect the H/L LH 20 A fuse and MAIN 200 A fuse.
•  If the fuse is blown:
―  Refer to the wiring diagram and verify whether or not there is a common connector between MAIN 200 A fuse and electrical supply unit (ESU) terminal 4C.
If there is a common connector:
•  Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to ground.
•  Repair or replace the malfunctioning part.
If there is no common connector:
•  Repair or replace the wiring harness which has a short to ground.
•  Replace the fuse.
•  If the fuse is damaged:
―  Replace the fuse.
•  If the fuse is normal:
―  Refer to the wiring diagram and verify whether or not there is a common connector between battery positive terminal and electrical supply unit (ESU) terminal 4C.
If there is a common connector:
•  Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit.
•  Repair or replace the malfunctioning part.
If there is no common connector:
•  Repair or replace the wiring harness which has an open circuit.
Go to Step 9.
3
VERIFY ELECTRICAL SUPPLY UNIT (ESU) POWER SUPPLY VOLTAGE
•  Connect the negative battery terminal.
•  Measure the voltage at the electrical supply unit (ESU) terminal 4C (wiring harness-side).
•  Is the voltage B+?
Yes
With front combination light (bulb type):
•  Go to the next step.
With front combination light (LED type):
•  Go to Step 5.
No
Disconnect the service plug.
(See SERVICE PLUG DISCONNECTION/CONNECTION [i-ELOOP].)
Inspect the H/L LH 20 A fuse.
•  If the fuse is blown:
―  Refer to the wiring diagram and verify whether or not there is a common connector between H/L LH 20 A fuse and electrical supply unit (ESU) terminal 4C.
If there is a common connector:
•  Determine the malfunctioning location by inspecting the common connector and terminals for corrosion, damage, or disconnection and by inspecting the DC-DC converter (i-ELOOP) terminal 4A-related wiring harness for a short to ground.
•  Repair or replace the malfunctioning part.
If there is no common connector:
•  Repair or replace the wiring harness which is shorted to ground, or the DC-DC converter (i-ELOOP) terminal 4A-related wiring harness.
•  Replace the fuse.
•  If the fuse is damaged:
―  Replace the fuse.
•  If the fuse is normal:
―  Refer to the wiring diagram and verify whether or not there is a common connector between DC-DC converter (i-ELOOP) terminal 4A and electrical supply unit (ESU) terminal 4C.
If there is a common connector:
•  Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit.
•  Repair or replace the malfunctioning part.
If there is no common connector:
•  Repair or replace the wiring harness which has an open circuit.
Connect the service plug, then go to Step 9.
(See SERVICE PLUG DISCONNECTION/CONNECTION [i-ELOOP].)
4
VISUALLY INSPECT HEADLIGHT HI/LO BULB (LH)
•  Visually inspect the headlight HI/LO bulb (LH).
•  Is the headlight HI/LO bulb (LH) normal?
Yes
Go to the next step.
No
Replace the headlight HI/LO bulb (LH), then go to Step 9.
(See HEADLIGHT BULB REMOVAL/INSTALLATION.)
5
INSPECT FRONT COMBINATION LIGHT (LH) CONNECTOR CONDITION
•  Switch the ignition off.
•  Disconnect the negative battery terminal.
•  Disconnect the front combination light (LH) connector.
•  Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection.
•  Is the connector normal?
Yes
Go to the next step.
No
Repair or replace the connector, then go to Step 9.
6
INSPECT HEADLIGHT LO (LH) GROUND CIRCUIT FOR OPEN CIRCUIT
•  Verify that the front combination light (LH) connector is disconnected.
•  Inspect for continuity between the following terminals (wiring harness-side) and body ground:
―  Front combination light (LH) terminal O
•  Is there continuity?
Yes
Go to the next step.
No
Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals:
•  Front combination light (LH) terminal O—Body ground
If there is a common connector:
•  Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit.
•  Repair or replace the malfunctioning part.
If there is no common connector:
•  Repair or replace the wiring harness which has an open circuit.
Go to Step 9.
7
INSPECT HEADLIGHT LO (LH) CIRCUIT FOR OPEN CIRCUIT
•  Verify that the front combination light (LH) and electrical supply unit (ESU) connectors are disconnected.
•  Inspect the wiring harness for continuity between front combination light (LH) terminal B (wiring harness-side) and electrical supply unit (ESU) terminal 4E (wiring harness-side).
•  Is there continuity?
Yes
With front combination light (bulb type):
•  Go to Step 9.
With front combination light (LED type):
•  Go to the next step.
No
Refer to the wiring diagram and verify whether or not there is a common connector between front combination light (LH) terminal B and electrical supply unit (ESU) terminal 4E.
If there is a common connector:
•  Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit.
•  Repair or replace the malfunctioning part.
If there is no common connector:
•  Repair or replace the wiring harness which has an open circuit.
Go to Step 9.
8
VERIFY IF MALFUNCTIONING LOCATION IS FRONT COMBINATION LIGHT (LH) DEPENDING ON REPEATABILITY
•  Always reconnect all disconnected connectors.
•  Connect the negative battery terminal.
•  Clear the DTC for the electrical supply unit (ESU) using the M-MDS.
•  Operate the light switch to the HEAD position and the dimmer switch to LO position.
•  Retrieve the electrical supply unit (ESU) DTCs using the M-MDS.
•  Is the same Pending DTC present?
Yes
Replace the front combination light (LH), then go to the next step.
(See FRONT COMBINATION LIGHT REMOVAL/INSTALLATION.)
No
Go to Step 10.
9
VERIFY THAT REPAIRS HAVE BEEN COMPLETED
•  Always reconnect all disconnected connectors.
•  Connect the negative battery terminal.
•  Clear the DTC for the electrical supply unit (ESU) using the M-MDS.
•  Operate the light switch to the HEAD position and the dimmer switch to LO position.
•  Retrieve the electrical supply unit (ESU) DTCs using the M-MDS.
•  Is the same Pending DTC present?
Yes
Repeat the inspection from Step 1.
•  If the malfunction recurs, replace the electrical supply unit (ESU).
Go to the next step.
No
Go to the next step.
10
VERIFY IF OTHER DTCs DISPLAYED
•  Are any other DTCs displayed?
Yes
Repair or replace the malfunctioning part according to the applicable DTC troubleshooting.
(See DTC TABLE [ELECTRICAL SUPPLY UNIT (ESU)].)
No
DTC troubleshooting completed.