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2008 - MX-5 - Body and Accessories

DISCHARGE HEADLIGHT SYSTEM INSPECTION

Discharge headlight inoperative

WARNING:

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.

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.

No

Replace the fuse.

3

INSPECT HEADLIGHT RELAY

Yes

Go to the next step.

No

Replace the headlight relay. (See RELAY LOCATION.)

4

INSPECT LIGHT SWITCH

Yes

Go to the next step.

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.

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.

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.

No

Replace the front combination light. (See FRONT COMBINATION LIGHT REMOVAL/INSTALLATION.)




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