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HOMESERVICE MANUALSMAZDA20105 SPORT, 2.3 L, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 582 (LIGHTING SYSTEM)DISCHARGE HEADLIGHT SYSTEM INSPECTIONINSPECTION PROCEDURE
2010 Mazda 5 Sport, 2.3 L, Standard

Inspection procedure

2010 Mazda 5 Sport, 2.3 L, StandardSECTION Inspection procedure
WARNING: This page is about a different car, the 2008 Mazda 5. However, it is still accessible from the selected car via links, so may be relevant.
INSPECTION CHART

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 A (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 LR 15 A fuse (RH) or HEAD LL 15A fuse(LH).
  • Inspect the fuses.
  • Are the fuses normal?
 Yes Go to the next step.
No Replace the fuse.
3 INSPECT HEADLIGHT LOW RELAY 
  • Inspect the headlight low relay. (See RELAY INSPECTION ).
  • Is the headlight low relay normal?
 Yes Go to the next step.
No Replace the headlight low relay. (See RELAY INSPECTION ).
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 
  • Disconnect the negative battery cable.
  • Inspect for continuity between the following terminals:
    • Battery (positive terminal) and headlight low relay terminal D.
    • HEAD LR 15 A fuse (RH) and discharge headlight control module terminal A
    • HEAD LL 15 A fuse (LH) 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 WIRING HARNESS BETWEEN DISCHARGE HEADLIGHT CONTROL MODULE AND GROUND 
  • Inspect the wiring harness between 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 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 discharge headlight control module.
(See DISCHARGE HEADLIGHT CONTROL MODULE REMOVAL/INSTALLATION ).
RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.