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Mazda 3 Service Manual: Discharge Headlight System Inspection

Mazda 3 Service Manual / Body / Lighting & Horn / Exterior / 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 negative battery cable..

  • Disconnect the discharge headlight control module connector.

  • Connect the negative battery cable..

  • 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)..

  • Inspect the headlight relay (LO)..

  • Is the headlight relay (LO) normal?

Yes

Go to the next step.

No

Replace the headlight relay (LO)..

4

INSPECT LIGHT SWITCH

  • Inspect the light switch..

  • Is the light switch normal?

Yes

Go to the next step.

No

Replace the light switch..

5

INSPECT FOR OPEN OR SHORT CIRCUITS IN THE FOLLOWING WIRING HARNESSES BETWEEN BATTERY AND DISCHARGE HEADLIGHT CONTROL MODULE

  • Disconnect the negative battery cable..

  • 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..

  • 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..

No

Replace the discharge headlight control module..


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