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:
License Plate Light
Purpose
The license plate lights shine light on the license plate during nighttime
driving.
Function
The license plate lights illuminate in conjunction with the operation of
the light switch.
Construction
The license plate lights are installed to the liftgate.
...
Fuel Injection Control System
Outline
Performs optimum fuel injection according to engine operation conditions.
The PCM determines the engine operation conditions based on the signals from
each input device and drives the fuel injectors at the optimal fuel injection
time (fuel injection amount) and the fuel ...
Air Intake Actuator [Manual Air Conditioner]
Purpose
The air intake actuator moves the air intake door in the blower unit to switch
the air intake port.
Function
The air intake actuator drives the motor based on the signal from the climate
control unit and moves the air intake door to the FRESH or REC position.
...