DISCHARGE HEADLIGHT SYSTEM INSPECTION

2008 - MX-5 - Body and Accessories

DISCHARGE HEADLIGHT SYSTEM INSPECTION

Discharge headlight inoperative

WARNING:

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

Terminal layout

Inspection procedure


STEP	INSPECTION		ACTION
1	INSPECT POWER SUPPLY CIRCUIT OF DISCHARGE HEADLIGHT CONTROL MODULE Disconnect the discharge headlight control module connector. Turn the headlight switch to the HEADLIGHT (LO) position. Measure the voltage at discharge headlight control module terminal C (wiring harness-side). Is the voltage approx. 12 V?	Yes	Go to Step 6.
1		No	Go to the next step.
2	INSPECT FUSE Turn the headlight switch to the OFF position. Remove the HEAD LOW R 15 A fuse (RH) or HEAD LOW L 15 A fuse (LH). Inspect the fuses. Are the fuses normal?	Yes	Go to the next step.
2		No	Replace the fuse.
3	INSPECT HEADLIGHT RELAY Remove the headlight relay. (See RELAY LOCATION.) Inspect the headlight relay. (See RELAY INSPECTION.) Is the headlight relay normal?	Yes	Go to the next step.
3		No	Replace the headlight relay. (See RELAY LOCATION.)
4	INSPECT LIGHT SWITCH Inspect the light switch. (See LIGHT SWITCH INSPECTION.) Is the light switch normal?	Yes	Go to the next step.
4		No	Replace the light switch. (See LIGHT SWITCH REMOVAL/INSTALLATION.)
5	INSPECT WIRING HARNESS BETWEEN BATTERY AND DISCHARGE HEADLIGHT CONTROL MODULE Remove the battery cover. Disconnect the negative battery cable. (See BATTERY REMOVAL/INSTALLATION [LF].) Inspect for continuity between the following terminals: Battery (positive terminal) and headlight relay (main fuse block terminal A) Headlight relay terminal 2C and HEAD LOW R 15 A fuse (RH) terminal U Headlight relay terminal 2C and HEAD LOW L 15 A fuse (LH) terminal U HEAD LOW R 15 A fuse (RH) terminal T and discharge headlight control module terminal C HEAD LOW L 15 A fuse (LH) terminal R and discharge headlight control module terminal C Are the wiring harnesses normal?	Yes	Go to the next step.
5		No	Replace the related wiring harness.
6	INSPECT WIRING HARNESS BETWEEN DISCHARGE HEADLIGHT CONTROL MODULE AND GROUND Inspect wiring harness between discharge headlight control module terminal F and ground for following: Short to power supply Open circuit Is the wiring harness normal?	Yes	Go to the next step.
6		No	Replace the related wiring harness.
7	VERIFY WHETHER MALFUNCTION IS IN DISCHARGE HEADLIGHT BULB OR DISCHARGE HEADLIGHT CONTROL MODULE Install the discharge headlight low bulb (previously verified as illuminating normally). (See HEADLIGHT BULB REMOVAL/INSTALLATION.) Connect the discharge headlight control module connector. Turn the headlight switch to the HEADLIGHT (LO) position. Does the headlight (low-beam) illuminate?	Yes	System inspection completed.
7		No	Replace the front combination light. (See FRONT COMBINATION LIGHT REMOVAL/INSTALLATION.)

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