DTC B1099:11 [ELECTRICAL SUPPLY UNIT (ESU)]

id0902ff060800

Description

Parking light (RH), taillight (LH), or license plate light (LH)/(RH) circuit malfunction

Detection condition

•  The electrical supply unit (ESU) detects a short to ground in the parking light (RH), taillight (LH), or license plate light (LH)/(RH) circuit.

Fail-safe

Not applicable

Possible cause

•  Electrical supply unit (ESU) connector or terminal malfunction

•  Parking light bulb (RH) malfunction

•  Front combination light (RH) connector or terminal malfunction

•  Short to ground in wiring harness between the following terminals:

―  Front combination light (RH) terminal C—Electrical supply unit (ESU) terminal 4G (With front combination light (bulb type) and without headlight manual leveling system)

―  Front combination light (RH) terminal D—Electrical supply unit (ESU) terminal 4G (With front combination light (LED type) or headlight manual leveling system)

•  Front combination light (RH) malfunction

•  Taillight bulb (LH) malfunction

•  License plate light bulb (LH) malfunction

•  License plate light bulb (RH) malfunction

•  Taillight (LH) connector or terminal malfunction

•  License plate light (LH) connector or terminal malfunction

•  License plate light (RH) connector or terminal malfunction

•  Short to ground in wiring harness between the following terminals:

―  Taillight (LH) terminal B—Electrical supply unit (ESU) terminal 1D (4SD)

―  Taillight (LH) terminal C—Electrical supply unit (ESU) terminal 1D (5HB)

―  License plate light (LH) terminal A—Electrical supply unit (ESU) terminal 1D

―  License plate light (RH) terminal A—Electrical supply unit (ESU) terminal 1D

•  Rear combination light (LH) malfunction

•  Electrical supply unit (ESU) malfunction

Description	Parking light (RH), taillight (LH), or license plate light (LH)/(RH) circuit malfunction
Detection condition	• The electrical supply unit (ESU) detects a short to ground in the parking light (RH), taillight (LH), or license plate light (LH)/(RH) circuit.
Fail-safe	Not applicable
Possible cause	• Electrical supply unit (ESU) connector or terminal malfunction • Parking light bulb (RH) malfunction • Front combination light (RH) connector or terminal malfunction • Short to ground in wiring harness between the following terminals: ― Front combination light (RH) terminal C—Electrical supply unit (ESU) terminal 4G (With front combination light (bulb type) and without headlight manual leveling system) ― Front combination light (RH) terminal D—Electrical supply unit (ESU) terminal 4G (With front combination light (LED type) or headlight manual leveling system) • Front combination light (RH) malfunction • Taillight bulb (LH) malfunction • License plate light bulb (LH) malfunction • License plate light bulb (RH) malfunction • Taillight (LH) connector or terminal malfunction • License plate light (LH) connector or terminal malfunction • License plate light (RH) connector or terminal malfunction • Short to ground in wiring harness between the following terminals: ― Taillight (LH) terminal B—Electrical supply unit (ESU) terminal 1D (4SD) ― Taillight (LH) terminal C—Electrical supply unit (ESU) terminal 1D (5HB) ― License plate light (LH) terminal A—Electrical supply unit (ESU) terminal 1D ― License plate light (RH) terminal A—Electrical supply unit (ESU) terminal 1D • Rear combination light (LH) malfunction • Electrical supply unit (ESU) malfunction

*1 :With front combination light (bulb type) and without headlight manual leveling system

*2 :With front combination light (LED type) or headlight manual leveling system

*3 :With front combination light (bulb type)

*4 :With front combination light (LED type)

*5 :With rear combination light (bulb type)

*6 :With rear combination light (LED type)

Diagnostic Procedure

Step	Inspection		Action
1	DETERMINE MALFUNCTIONING LIGHT • Operate the light switch to the TNS position. • Are there any lights among the following which are not illuminated? ― Parking light (RH) ― Taillight (LH) ― License plate light (LH) ― License plate light (RH)	Yes	If all lights do not turn on: • Go to the next step. If parking light (RH) does not turn on: • With front combination light (bulb type) and without headlight manual leveling system: ― Go to Step 3. • With front combination light (LED type) or headlight manual leveling system: ― Go to Step 4. If taillight (LH) and license plate light (LH)/(RH) do not turn on: • With rear combination light (bulb type): ― Go to Step 8. • With rear combination light (LED type): ― Go to Step 9.
1		No	Go to Step 17.
2	INSPECT ELECTRICAL SUPPLY UNIT (ESU) CONNECTOR CONDITION • Switch the ignition off. • Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.) • 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	Go to Step 17.
2		No	Repair or replace the connector, then go to Step 17.
3	VISUALLY INSPECT PARKING LIGHT BULB (RH) • Visually inspect the parking light bulb (RH). • Is the parking light bulb (RH) normal?	Yes	Go to the next step.
3		No	Replace the parking light bulb (RH), then go to Step 17. (See PARKING LIGHT BULB REMOVAL/INSTALLATION.)
4	INSPECT FRONT COMBINATION LIGHT (RH) CONNECTOR CONDITION • Switch the ignition off. • Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.) • Disconnect the front combination light (RH) 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.
4		No	Repair or replace the connector, then go to Step 17.
5	INSPECT ELECTRICAL SUPPLY UNIT (ESU) CONNECTOR CONDITION • 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	Go to the next step.
5		No	Repair or replace the connector, then go to Step 17.
6	INSPECT PARKING LIGHT (RH) CONTROL CIRCUIT FOR SHORT TO GROUND • Verify that the front combination light (RH) and electrical supply unit (ESU) connectors are disconnected. • Inspect for continuity between the following terminals (wiring harness-side) and body ground: ― Front combination light (RH) terminal C (With front combination light (bulb type) and without headlight manual leveling system) ― Front combination light (RH) terminal D (With front combination light (LED type) or headlight manual leveling system) • Is there continuity?	Yes	Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals: • Front combination light (RH) terminal C—Electrical supply unit (ESU) terminal 4I (With front combination light (bulb type) and without headlight manual leveling system) • Front combination light (RH) terminal D—Electrical supply unit (ESU) terminal 4I (With front combination light (LED type) or headlight manual leveling system) 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. Go to Step 17.
6		No	With front combination light (bulb type): • Go to Step 17. With front combination light (LED type): • Go to the next step.
7	VERIFY IF MALFUNCTIONING LOCATION IS FRONT COMBINATION LIGHT (RH) DEPENDING ON REPEATABILITY • Always reconnect all disconnected connectors. • Connect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.) • Clear the DTC for the electrical supply unit (ESU) using the M-MDS. (See CLEARING DTC [ELECTRICAL SUPPLY UNIT (ESU)].) • Operate the light switch to the TNS position. • Retrieve the electrical supply unit (ESU) DTCs using the M-MDS. (See DTC INSPECTION [ELECTRICAL SUPPLY UNIT (ESU)].) • Is the same DTC displayed?	Yes	Replace the front combination light (RH), then go to Step 17. (See FRONT COMBINATION LIGHT REMOVAL/INSTALLATION.)
7		No	Go to Step 17.
8	VISUALLY INSPECT TAILLIGHT BULB (LH) • Visually inspect the taillight bulb (LH). • Is the taillight bulb (LH) normal?	Yes	Go to the next step.
8		No	Replace the taillight bulb (LH), then go to Step 17. (See BRAKE LIGHT/TAILLIGHT BULB REMOVAL/INSTALLATION.)
9	VISUALLY INSPECT LISENCE PLATE LIGHT BULB (LH) • Visually inspect the license plate light bulb (LH). • Is the license plate light bulb (LH) normal?	Yes	Go to the next step.
9		No	Replace the license plate light bulb (LH), then go to Step 17. (See LICENSE PLATE LIGHT BULB REMOVAL/INSTALLATION.)
10	VISUALLY INSPECT LISENCE PLATE LIGHT BULB (RH) • Visually inspect the license plate light bulb (RH). • Is the license plate light bulb (RH) normal?	Yes	Go to the next step.
10		No	Replace the license plate light bulb (RH), then go to Step 17. (See LICENSE PLATE LIGHT BULB REMOVAL/INSTALLATION.)
11	INSPECT TAILLIGHT (LH) CONNECTOR CONDITION • Switch the ignition off. • Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.) • Disconnect the taillight (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.
11		No	Repair or replace the connector, then go to Step 17.
12	INSPECT LISENCE PLATE LIGHT (LH) CONNECTOR CONDITION • Disconnect the license plate 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.
12		No	Repair or replace the connector, then go to Step 17.
13	INSPECT LISENCE PLATE LIGHT (RH) CONNECTOR CONDITION • Disconnect the license plate light (RH) 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.
13		No	Repair or replace the connector, then go to Step 17.
14	INSPECT ELECTRICAL SUPPLY UNIT (ESU) CONNECTOR CONDITION • 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	Go to the next step.
14		No	Repair or replace the connector, then go to Step 17.
15	INSPECT TAILLIGHT (LH), OR LICENSE PLATE LIGHT (LH)/(RH) CONTROL CIRCUIT FOR SHORT TO GROUND • Verify that the taillight (LH), license plate light (LH), license plate light (RH) and electrical supply unit (ESU) connectors are disconnected. • Inspect for continuity between the following terminals (wiring harness-side) and body ground: ― Taillight (LH) terminal B (4SD) ― Taillight (LH) terminal C (5HB) ― license plate light (LH) terminal A ― license plate light (RH) terminal A • Is there continuity?	Yes	Refer to the wiring diagram and verify whether or not there is a common connector between following terminals: • Taillight (LH) terminal B—Electrical supply unit (ESU) terminal 1D (4SD) • Taillight (LH) terminal C—Electrical supply unit (ESU) terminal 1D (5HB) • License plate light (LH) terminal A—Electrical supply unit (ESU) terminal 1D • License plate light (RH) terminal A—Electrical supply unit (ESU) terminal 1D 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. Go to Step 17.
15		No	With rear combination light (bulb type): • Go to Step 17. With rear combination light (LED type): • Go to the next step.
16	VERIFY IF MALFUNCTIONING LOCATION IS REAR COMBINATION LIGHT (LH) DEPENDING ON REPEATABILITY • Always reconnect all disconnected connectors. • Connect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.) • Clear the DTC for the electrical supply unit (ESU) using the M-MDS. (See CLEARING DTC [ELECTRICAL SUPPLY UNIT (ESU)].) • Operate the light switch to the TNS position. • Retrieve the electrical supply unit (ESU) DTCs using the M-MDS. (See DTC INSPECTION [ELECTRICAL SUPPLY UNIT (ESU)].) • Is the same DTC displayed?	Yes	Replace the rear combination light (LH), then go to the next step. (See REAR COMBINATION LIGHT REMOVAL/INSTALLATION.)
16		No	Go to Step 18.
17	VERIFY THAT REPAIRS HAVE BEEN COMPLETED • Always reconnect all disconnected connectors. • Connect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.) • Clear the DTC for the electrical supply unit (ESU) using the M-MDS. (See CLEARING DTC [ELECTRICAL SUPPLY UNIT (ESU)].) • Operate the light switch to the TNS position. • Retrieve the electrical supply unit (ESU) DTCs using the M-MDS. (See DTC INSPECTION [ELECTRICAL SUPPLY UNIT (ESU)].) • Is the same DTC displayed?	Yes	Repeat the inspection from Step 1. • If the malfunction recurs, replace the electrical supply unit (ESU). (See ELECTRICAL SUPPLY UNIT (ESU) REMOVAL/INSTALLATION.) Go to the next step.
17		No	Go to the next step.
18	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)].)
18		No	DTC troubleshooting completed.