Inspection procedure

WARNING: This page is about a different car, the 2009 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.

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 connector (harness-side) terminal A 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 LO RH 10 A fuse or HEAD LO LH 10 A fuse. 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 (LO). (See RELAY LOCATION .) Inspect the headlight relay (LO) (See RELAY INSPECTION ) Is the headlight low relay normal?	Yes	Go to the next step.
3		No	Replace the headlight low 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 Disconnect the negative battery cable. Inspect for continuity between the following terminals Positive battery-headlight low relay terminal D HEAD LO RH 10 A fuse-discharge headlight control module terminal A HEAD LO LH 10 A fuse-discharge headlight control module terminal A 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 B 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 OR DISCHARGE HEADLIGHT CONTROL MODULE Install any other discharge headlight. (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 discharge headlight control module. (See DISCHARGE HEADLIGHT CONTROL MODULE REMOVAL/INSTALLATION .)