DISCHARGE HEADLIGHT SYSTEM INSPECTION

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Discharge headlight inoperative

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

Terminal layout

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Inspection procedure

STEP

INSPECTION

ACTION
1
INSPECT POWER SUPPLY CIRCUIT OF DISCHARGE HEADLIGHT CONTROL MODULE
•  Disconnect the negative battery cable. (See BATTERY REMOVAL/INSTALLATION [MZR 2.0, MZR 2.5].) (See BATTERY REMOVAL/INSTALLATION [MZR 2.3 DISI Turbo].) (See BATTERY REMOVAL/INSTALLATION [MZR 2.0 DISI i-stop].) (See BATTERY REMOVAL/INSTALLATION [MZR 1.5, MZR 1.6].) (See BATTERY REMOVAL/INSTALLATION [SKYACTIV-G 2.0].)
•  Disconnect the discharge headlight control module connector.
•  Connect the negative battery cable. (See BATTERY REMOVAL/INSTALLATION [MZR 2.0, MZR 2.5].) (See BATTERY REMOVAL/INSTALLATION [MZR 2.3 DISI Turbo].) (See BATTERY REMOVAL/INSTALLATION [MZR 2.0 DISI i-stop].) (See BATTERY REMOVAL/INSTALLATION [MZR 1.5, MZR 1.6].) (See BATTERY REMOVAL/INSTALLATION [SKYACTIV-G 2.0].)
•  Turn the light switch to the HEAD position.
•  Measure the voltage at discharge headlight control module connector (harness-side) terminal A.
•  Is the voltage approx. 12 V?
Yes
Go to Step 6.
No
Go to the next step.
2
INSPECT FUSE
•  Turn the light switch to the OFF position.
•  Remove the H/L LO RH 15 A fuse or H/L LO LH 15 A fuse.
•  Inspect the fuses.
•  Are the fuses normal?
Yes
Go to the next step.
No
Replace the fuse.
3
INSPECT HEADLIGHT RELAY
•  Remove the headlight relay (LO). (See RELAY LOCATION.)
•  Inspect the headlight relay (LO). (See RELAY INSPECTION.)
•  Is the headlight relay (LO) normal?
Yes
Go to the next step.
No
Replace the headlight relay (LO). (See RELAY INSPECTION.)
4
INSPECT LIGHT SWITCH
•  Inspect the light switch. (See LIGHT SWITCH INSPECTION.)
•  Is the light switch normal?
Yes
Go to the next step.
No
Replace the light switch. (See LIGHT SWITCH REMOVAL/INSTALLATION.)
5
INSPECT FOR OPEN OR SHORT CIRCUITS IN THE FOLLOWING WIRING HARNESSES BETWEEN BATTERY AND DISCHARGE HEADLIGHT CONTROL MODULE
•  Disconnect the negative battery cable. (See BATTERY REMOVAL/INSTALLATION [MZR 2.0, MZR 2.5].) (See BATTERY REMOVAL/INSTALLATION [MZR 2.3 DISI Turbo].) (See BATTERY REMOVAL/INSTALLATION [MZR 2.0 DISI i-stop].) (See BATTERY REMOVAL/INSTALLATION [MZR 1.5, MZR 1.6].) (See BATTERY REMOVAL/INSTALLATION [SKYACTIV-G 2.0].)
•  Inspect for continuity between the following terminals:
―  Positive battery—headlight relay (LO) terminal D
―  H/L LO RH 15 A fuse—discharge headlight control module terminal A
―  H/L LO LH 15 A fuse—discharge headlight control module terminal A
•  Are the wiring harnesses normal?
Yes
Go to the next step.
No
Replace the related wiring harness.
6
INSPECT FOR OPEN OR SHORT CIRCUITS IN THE FOLLOWING WIRING HARNESS BETWEEN DISCHARGE HEADLIGHT CONTROL MODULE AND GROUND
•  Inspect the wiring harness between the discharge headlight control module terminal B and ground for the following:
―  Short to power supply
―  Open circuit
•  Is the wiring harness normal?
Yes
Go to the next step.
No
Replace the related wiring harness.
7
VERIFY WHETHER MALFUNCTION IS IN DISCHARGE HEADLIGHT BULB OR DISCHARGE HEADLIGHT CONTROL MODULE
•  Install any other discharge headlight bulb. (See HEADLIGHT BULB REMOVAL/INSTALLATION.)
•  Connect the discharge headlight control module connector.
•  Turn the light switch to the HEAD position.
•  Does the headlight (low-beam) illuminate?
Yes
Replace the discharge headlight bulb. (See HEADLIGHT BULB REMOVAL/INSTALLATION.)
No
Replace the discharge headlight control module. (See DISCHARGE HEADLIGHT CONTROL MODULE REMOVAL/INSTALLATION.)