Mazda CX-5 Service & Repair Manual: Discharge Headlight Control Module
Purpose
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Converts DC voltage from the battery to AC voltage and outputs the stabilized voltage to the discharge headlight.
Function
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The discharge headlight control module controls the voltage from the battery to illuminate the discharge headlight.
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The discharge headlight control module has a fail-safe function which turns off the discharge headlight if an input/output voltage malfunction occurs for the prevention of part mis-operation and protection.
Construction
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The discharge headlight control module consists of an igniter which raises the voltage from the battery to approx. 25,000 V, and an inverter which converts the DC voltage from the battery to AC voltage.
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The inverter is integrated with the discharge headlight control module.
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The igniter is installed to the discharge headlight bulb.
Operation
1. When the headlight relay (LO) turns on, the discharge headlight control module raises the DC voltage from the battery from approx. 12 V to approx. 25,000 V using the igniter, and outputs it to the discharge headlight bulb.
2. After the discharge headlight is illuminated, the discharge headlight control module converts the DC voltage from the battery to AC voltage (approx. 42 V) using the inverter, and outputs it to the discharge headlight bulb.
Fail-safe
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If the following input/output voltage malfunctions occur, the fail-safe function is activated.
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Operation condition
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Fail-safe
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Recovery condition
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Input/output voltage from discharge headlight control module is outside of 6—18 V range. (Except for voltage reduction directly after discharge headlight illumination) |
Turns off discharge headlights |
Normal input voltage detected |
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Malfunction is detected in output voltage from discharge headlight control module (open circuit or short to ground in wiring harness) |
Turns off discharge headlights |
Light switch turned to OFF, and then back to ON |
Discharge Headlight Bulb
Purpose, Function
Charges the internal metallic element and emits white light resembling sunlight.
Construction
A mercury-free bulb has been adopted for the discharge headlight bul ...
Discharge Headlight Control Module Removal/Installation
WARNING:
Incorrect servicing of the discharge headlights could result in electrical
shock. Before servicing the discharge headlights, always refer to the service
warnings..
1. Disc ...
Other materials:
Headlight Auto Leveling System
Outline
Automatically adjusts the headlight optical axis in response to changes in
load and passenger conditions to prevent blinding of oncoming vehicles from
headlight glare and to assure a range of visibility.
The AFS control module performs headlight auto leveling system fail ...
Airbag system
General information
WARNING
If you have not fastened your safety belt,
you are in an incorrect seating position, or
you are too close to the airbag system, the
airbag system will not be able to protect
you. This increases the risk of serious or fatal
injuries. Make sure that every vehicle
pa ...
Side Air Bag Module [Standard Deployment Control System]
Purpose
When a side air bag module receives an impact from a lateral collision, the
operation (deployment) of the air bag mediates the impact to the chest, stomach,
and waist of the driver and front passenger.
Function
When a side air bag module receives an impact from a la ...
