Autostart/stop is dependent on battery voltage above all else. If the system senses battery lower than perfect charge, it disables automatically the prevent battery from draining due to frequent restarts with inadequate charge time (especially in stopand go traffic). When your headlamps are on, you typically have an extra drain of 12-30 amps, and more on some cars with HID headlamps and multibulb driving lamps. The alternator knows these cars will draw so much (over 30 amps) if left on for a 2 or 3 minute stoplight wait, the battery may get drained to below optimal...so the system will frequently refuse to activate when headlamps are on. On cars that are voltage sensing only, or have date coding/mileage coding of the battery (BMW mainly), a new battery will re-enable the night use on such a system. On cars where it is sensing load, you may have to accept that you cant use the system at night.
The battery needs to be changed, so that you won't have any stop and on the traffic, safety is most important.
SOURCE: mazda cx-7 2008 left headlight stopped working,
check the wiring from the headlight. You want to find the ground wire which is usually a black wire thats secured to some metal part of the car. Basically just check that all your wires are in tact and tightly secured. A bad ground is a very common electrical problem.
SOURCE: How do I change the entire headlight assembly on a 2008 Mazda CX 9.
There are a few installation bolts that are accessible from the top and side but you will need to remove the entire front bumper to access two of the lower ones. Here are some pics from the factory manual. First shows location of the headlight bolts and fasteners. Others show how to remove the bumper. 10mm socket should handle all the bolts you need to remove. Disconnect the battery prior to starting and headlights off. HID headlight voltage is around 25,000 volts so you want to ensure no power to the system before performing repairs.
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