DISCHARGE HEADLIGHT SYSTEM INSPECTION

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Warning

•  Incorrect servicing of the discharge headlights could result in electrical shock. Before servicing the discharge headlights, always refer to the service warnings. (See DISCHARGE HEADLIGHT SERVICE WARNINGS.)

System Wiring Diagram

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Diagnostic Procedure

Step	Inspection		Action
1	VERIFY FRONT BODY CONTROL MODULE (FBCM) DTCs •  Perform the DTC inspection for the front body control module (FBCM) using the M-MDS. (See DTC INSPECTION [FRONT BODY CONTROL MODULE (FBCM)].) •  Is a DTC displayed?	Yes	Repair the malfunctioning location according to the applicable DTC troubleshooting. (See DTC TABLE [FRONT BODY CONTROL MODULE (FBCM)].)
		No	Go to the next step.
2	INSPECT RELAY •  Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [MZR 1.6].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 2.2].)(See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 1.5].) •  Remove the following relays: ―  Headlight LO relay (LH) ―  Headlight LO relay (RH) ―  Headlight HI relay •  Inspect the relays. (See RELAY INSPECTION.) •  Are the relays normal?	Yes	Install the relays, then go to the next step.
		No	Replace the malfunctioning relay.
3	INSPECT LIGHT SWITCH •  Inspect the light switch. (See LIGHT SWITCH INSPECTION.) •  Is the light switch normal?	Yes	Install the light switch, then go to the next step. (See LIGHT SWITCH REMOVAL/INSTALLATION.)
		No	Replace the light switch. (See LIGHT SWITCH REMOVAL/INSTALLATION.)
4	INSPECT FRONT COMBINATION LIGHT CONNECTOR •  Disconnect the front combination light connector. (See FRONT COMBINATION LIGHT REMOVAL/INSTALLATION.) •  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.
5	INSPECT FRONT COMBINATION LIGHT GROUND CIRCUIT FOR OPEN CIRCUIT •  Verify that the front combination light connector is disconnected. •  Inspect for continuity between front combination light terminal O (front wiring harness side) and body ground. •  Is there continuity?	Yes	Go to the next step.
		No	Refer to the wiring diagram and verify if there is a common connector between front combination light terminal O and body ground. If there is a common connector: •  Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for open circuit to determine the malfunctioning location. •  Repair or replace the malfunctioning location. If there is no common connector: •  Repair or replace the wiring harness which has an open circuit.
6	INSPECT HEADLIGHT LO POWER SUPPLY CIRCUIT •  Verify that the front combination light connector is disconnected. •  Connect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [MZR 1.6].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 2.2].)(See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 1.5].) •  Operate the light switch to the HEAD position. •  Measure the voltage at front combination light terminal B (front wiring harness side). •  Is the voltage B+?	Yes	Operate the light switch to the OFF position, then go to the next step.
		No	Inspect the HID L 15 A fuse and HID R 15 A fuse. •  If a fuse is blown: ―  Refer to the wiring diagram and verify if there is a common connector between HID L 15 A fuse or HID R 15 A fuse and front combination light terminal B. If there is a common connector: •  Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for short to ground to determine the malfunctioning location. •  Repair or replace the malfunctioning location. If there is no common connector: •  Repair or replace the wiring harness which is shorted to ground. •  Replace the blown fuse. •  If a fuse is damaged: ―  Replace the damaged fuse. •  If both fuses are normal: ―  Refer to the wiring diagram and verify if there is a common connector between positive battery terminal and front combination light terminal B. If there is a common connector: •  Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for open circuit to determine the malfunctioning location. •  Repair or replace the malfunctioning location. If there is no common connector: •  Repair or replace the wiring harness which has an open circuit.
7	INSPECT HEADLIGHT HI POWER SUPPLY CIRCUIT •  Verify that the front combination light connector is disconnected. •  Operate the light switch to the HEAD and HI position. •  Measure the voltage at front combination light terminal A (front wiring harness side). •  Is the voltage B+?	Yes	Operate the light switch to the OFF position, then go to the next step.
		No	Inspect the H/L HI 20 A fuse. •  If the fuse is blown: ―  Refer to the wiring diagram and verify if there is a common connector between H/L HI 20 A fuse and front combination light terminal A. If there is a common connector: •  Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for short to ground to determine the malfunctioning location. •  Repair or replace the malfunctioning location. If there is no common connector: •  Repair or replace the wiring harness which is shorted to ground. •  Replace the blown fuse. •  If the fuse is damaged: ―  Replace the damaged fuse. •  If the fuse is normal: ―  Refer to the wiring diagram and verify if there is a common connector between positive battery terminal and front combination light terminal A. If there is a common connector: •  Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for open circuit to determine the malfunctioning location. •  Repair or replace the malfunctioning location. If there is no common connector: •  Repair or replace the wiring harness which has an open circuit.
8	INSPECT DISCHARGE HEADLIGHT CONTROL MODULE CONNECTOR •  Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [MZR 1.6].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 2.2].)(See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 1.5].) •  Disconnect the discharge headlight control module connector. (See DISCHARGE HEADLIGHT CONTROL MODULE REMOVAL/INSTALLATION.) •  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.
9	INSPECT FRONT COMBINATION LIGHT INTERNAL CIRCUIT FOR OPEN CIRCUIT •  Verify that the following connectors are disconnected. ―  Front combination light ―  Discharge headlight control module •  Inspect for continuity in the wiring harness between the following terminals: ―  Front combination light terminal B (short cord side) and discharge headlight control module terminal A (short cord side) ―  Front combination light terminal O (short cord side) and discharge headlight control module terminal B (short cord side) ―  Front combination light terminal A (short cord side) and front combination light terminal O (short cord side) ―  Discharge headlight control module terminal A (igniter side) and igniter terminal A ―  Discharge headlight control module terminal B (igniter side) and igniter terminal B ―  Discharge headlight control module terminal C (igniter side) and igniter terminal C •  Is there continuity?	Yes	Go to the next step.
		No	Replace the front combination light. (See FRONT COMBINATION LIGHT REMOVAL/INSTALLATION.)
10	VERIFY IF MALFUNCTION CAUSE IS HEADLIGHT HI/LO BULB •  Install a normal headlight HI/LO bulb. (See HEADLIGHT BULB REMOVAL/INSTALLATION.) •  Reconnect all the disconnected connectors. •  Connect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [MZR 1.6].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 2.2].)(See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 1.5].) •  Operate the light switch to the HEAD position. •  Does the headlight LO turn on?	Yes	Replace the headlight HI/LO bulb. (See HEADLIGHT BULB REMOVAL/INSTALLATION.)
		No	Operate the light switch to the OFF position, then go to the next step.
11	VERIFY IF MALFUNCTION CAUSE IS DISCHARGE HEADLIGHT CONTROL MODULE OR IGNITER •  Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [MZR 1.6].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 2.2].)(See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 1.5].) •  Install a normal igniter. (See IGNITER REMOVAL/INSTALLATION.) •  Connect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [MZR 1.6].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 2.2].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 1.5].) •  Operate the light switch to the HEAD position. •  Does the headlight LO turn on?	Yes	Replace the igniter. (See IGNITER REMOVAL/INSTALLATION.)
		No	Replace the discharge headlight control module. (See DISCHARGE HEADLIGHT CONTROL MODULE REMOVAL/INSTALLATION.)