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Inspection procedure

WARNING: This page is about a different car, the 2007 Mazda 3. However, it is still accessible from the selected car via links, so may be relevant.
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 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 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 PJB. (See PASSENGER JUNCTION BOX (PJB) REMOVAL/INSTALLATION .)
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 PJB (terminal J-01 AM)
    • HEAD LOW R 15 A fuse (RH) and discharge headlight control module terminal A
    • HEAD LOW L 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 any other discharge headlight bulb (low-beam). (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 ).
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