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:
Steering Gear And Linkage Removal/Installation
CAUTION:
Performing the following procedures without first removing the ABS wheel-speed
sensor may possibly cause an open circuit in the wiring harness if it is pulled
by mistake. Before performing the following procedures, disconnect the ABS wheel-speed
sensor (axle side) and fix t ...
Afs (Adaptive Front Lighting System)
Outline
The AFS is a system which enhances the range of visibility when the headlights
are turned on by pointing the optical axis of the headlights in the direction
in which the vehicle is advancing according to the steering operation.
Function
The AFS is controlled by the ...
Crankshaft Position (CKP) Sensor
Purpose/Function
Detects the crankshaft speed as basic information for mainly determining
the fuel injection timing and ignition timing.
Detects the crankshaft speed and inputs it to the PCM as a CKP signal.
Construction
Installed on the side of the cylinder block (ri ...