Diagnostic Procedure

DTC B1D03-13; HEADLIGHT HI (RH) CIRCUIT MALFUNCTION - DIAGNOSTIC PROCEDURE

Step	Inspection		Action
1	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 the next step.
1		No	Repair or replace the connector, then go to Step 8.
2	VERIFY ELECTRICAL SUPPLY UNIT (ESU) POWER SUPPLY VOLTAGE Connect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION .) Measure the voltage at the electrical supply unit (ESU) terminal 3B (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 4.
2		No	Inspect the H/L RH 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 3B. 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 3B. 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 8.
3	VISUALLY INSPECT HEADLIGHT HI/LO BULB (RH) Visually inspect the headlight HI/LO bulb (RH). Is the headlight HI/LO bulb (RH) normal?	Yes	Go to the next step.
3		No	Replace the headlight HI/LO bulb (RH), then go to Step 8. (See HEADLIGHT 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 8.
5	INSPECT HEADLIGHT HI (RH) GROUND CIRCUIT FOR OPEN CIRCUIT Verify that the front combination light (RH) connector is disconnected. Inspect for continuity between the following terminals (wiring harness-side) and body ground: Front combination light (RH) terminal F (With front combination light (bulb type)) Front combination light (RH) terminal O (With front combination light (LED type)) Is there continuity?	Yes	Go to the next step.
5		No	Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals: Front combination light (RH) terminal F-Body ground (With front combination light (bulb type)) Front combination light (RH) terminal O-Body ground (With front combination light (LED type)) 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 8.
6	INSPECT HEADLIGHT HI (RH) CIRCUIT FOR OPEN CIRCUIT Verify that the front combination light (RH) and electrical supply unit (ESU) connectors are disconnected. Inspect the wiring harness for continuity between front combination light (RH) terminal A (wiring harness-side) and electrical supply unit (ESU) terminal 3A (wiring harness-side). Is there continuity?	Yes	With front combination light (bulb type): Go to Step 8. With front combination light (LED type): Go to the next step.
6		No	Refer to the wiring diagram and verify whether or not there is a common connector between front combination light (RH) terminal A and electrical supply unit (ESU) terminal 3A. 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 8.
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 HEAD position and the dimmer switch to HI 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 the next step. (See FRONT COMBINATION LIGHT REMOVAL/INSTALLATION .)
7		No	Go to Step 9.
8	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 HEAD position and the dimmer switch to HI 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.
8		No	Go to the next step.
9	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)] .)
9		No	DTC troubleshooting completed.