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Headlight problem
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<blockquote data-quote="aidilj" data-source="post: 560288" data-attributes="member: 20536"><p>It seems the only switch would be in the LSZ area, to check if there is relay try to activate follow me home function and listen for clicking at the switch.</p><p></p><p><img src="http://i791.photobucket.com/albums/yy197/aidilj/wds/lsz.png" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p><img src="http://i791.photobucket.com/albums/yy197/aidilj/wds/lo_beam.png" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p><span style="color: black">Light switch centre (LSZ)</span></p><p> <span style="color: black"></span></p><p><span style="color: black">In addition to the electronic control and monitoring system for the external vehicle lights, the light switch centre also comprises the switch for sidelights/dipped beam, the pushbuttons for fog lights and rear fog lights as well as the potentiometers for instrument locator lighting and manual headlight vertical aim control.</span></p><p> <span style="color: black"></span></p><p><span style="color: black"><span style="color: navy">Scope of functions of light switching centre</span></span></p><p><span style="color: black"></span></p><p> <span style="color: black">•Control and monitoring of the outer headlights and lamps, including the indicator and hazard warning flasher function</span></p><p><span style="color: black">•Control of relay for fog lights</span></p><p><span style="color: black">•Evaluation of load sensors for automatic headlight vertical aim control and the resulting activation of stepper motors of evaluation of potentiometer for manual headlight vertical aim control.</span></p><p><span style="color: black">•Dimmer function for instrument and locator lighting (terminal 58g) as well as the function and locator lighting for the hazard warning switch.</span></p><p><span style="color: black"></span></p><p><span style="color: black">Communication with other control units and diagnosis takes place via the K-bus. The light switching centre receives information via this bus relating to the vehicle status and also provides information on the status of the controlled lamps (defective/OK, switched ON/OFF).</span></p><p> <span style="color: black"></span></p><p><span style="color: black">The indicator lamps for full beam, fog light, rear fog light and direction indicators in the instrument cluster are controlled by the light switching centre on the basis of K-bus telegrams.</span></p><p> <span style="color: black"></span></p><p><span style="color: black"><span style="color: navy">Design</span></span></p><p> <span style="color: black"><span style="color: navy"></span></span></p><p><span style="color: black"><span style="color: navy">The light switch centre consists of a control unit and operating panel</span></span></p><p> <span style="color: black"></span></p><p><span style="color: black">Both units are interconnected by means of a plug connector.</span></p><p> <span style="color: black"></span></p><p><span style="color: black"><span style="color: navy">Control unit</span></span></p><p> <span style="color: black"></span></p><p><span style="color: black">The control electronics is accommodated in the control unit.</span></p><p> <span style="color: black"></span></p><p><span style="color: black"><span style="color: navy">Operating panel</span></span></p><p> <span style="color: black"></span></p><p><span style="color: black">The switches for sidelights/dipped beam, fog lights/rear fog lights as well as the dimmer for headlight vertical aim control and instrument lighting are integrated in the operating panel.</span></p><p> <span style="color: black"></span></p><p><span style="color: black">The operating panel can be replaced separately from the control unit.</span></p><p> <span style="color: black"></span></p><p><span style="color: black">If replacement is necessary, corresponding reference to this is made in the test module.</span></p><p> <span style="color: black"></span></p><p><span style="color: black"><span style="color: navy">Lamp monitoring</span></span></p><p> <span style="color: black"></span></p><p><span style="color: black">The lamps are monitored in OFF and ON status.</span></p><p> <span style="color: black"></span></p><p><span style="color: black">Cold monitoring in the OFF status takes place by briefly switching on the lamp (so short that the lamp does not light up). The lamp current is monitored and an assessment is made as to whether the lamp is defective or not.</span></p><p> <span style="color: black"></span></p><p><span style="color: black"><span style="color: darkred">Note</span></span></p><p><span style="color: black"></span></p><p><span style="color: black">If the battery voltage drops below approx. 9.5 V, the lamp status can no longer be monitored or output.</span></p><p> <span style="color: black"></span></p><p><span style="color: black"><span style="color: navy">Activating indicator lamps in the instrument cluster</span></span></p><p> <span style="color: black"></span></p><p><span style="color: black">The indicator lamps for left direction indicator, right direction indicator, rear fog lights, fog lights, full beam as well as the LEDs in the pictogram incorporated in the instrument cluster are activated via the K-bus.</span></p><p> <span style="color: black"></span></p><p><span style="color: black"><span style="color: navy">Emergency mode</span></span></p><p> <span style="color: black"></span></p><p><span style="color: black">Independent hardware is provided in order to maintain the functions necessary for driving safety in the event of the control unit failing.</span></p><p> <span style="color: black"></span></p><p><span style="color: black">If the light switching centre is in emergency mode,</span></p><p> <span style="color: black">•Tail lights and dipped beam lights are switched on at terminal 15 irrespective of the position of the corresponding light switch</span></p><p><span style="color: black">•Left and right brake lights are switched on at terminal 15 and the brake light switch operated</span></p><p><span style="color: black">•Direction indicators, hazard warning lights, full beam, headlight flasher, fog lights and rear fog lights cannot be switched on.</span></p><p><span style="color: black">•Diagnosis is not possible</span></p><p> <span style="color: black"></span></p><p><span style="color: black">If in emergency mode, the light switching centre must be replaced.</span></p><p></p><p>from : <a href="http://wds.spaghetticoder.org/en/zinfo/FOI0398FB-046613101.htm" target="_blank">http://wds.spaghetticoder.org/en/zinfo/FOI0398FB-046613101.htm</a></p></blockquote><p></p>
[QUOTE="aidilj, post: 560288, member: 20536"] It seems the only switch would be in the LSZ area, to check if there is relay try to activate follow me home function and listen for clicking at the switch. [IMG]http://i791.photobucket.com/albums/yy197/aidilj/wds/lsz.png[/IMG] [IMG]http://i791.photobucket.com/albums/yy197/aidilj/wds/lo_beam.png[/IMG] [COLOR="black"]Light switch centre (LSZ) In addition to the electronic control and monitoring system for the external vehicle lights, the light switch centre also comprises the switch for sidelights/dipped beam, the pushbuttons for fog lights and rear fog lights as well as the potentiometers for instrument locator lighting and manual headlight vertical aim control. [COLOR="navy"]Scope of functions of light switching centre[/COLOR] •Control and monitoring of the outer headlights and lamps, including the indicator and hazard warning flasher function •Control of relay for fog lights •Evaluation of load sensors for automatic headlight vertical aim control and the resulting activation of stepper motors of evaluation of potentiometer for manual headlight vertical aim control. •Dimmer function for instrument and locator lighting (terminal 58g) as well as the function and locator lighting for the hazard warning switch. Communication with other control units and diagnosis takes place via the K-bus. The light switching centre receives information via this bus relating to the vehicle status and also provides information on the status of the controlled lamps (defective/OK, switched ON/OFF). The indicator lamps for full beam, fog light, rear fog light and direction indicators in the instrument cluster are controlled by the light switching centre on the basis of K-bus telegrams. [COLOR="navy"]Design The light switch centre consists of a control unit and operating panel[/COLOR] Both units are interconnected by means of a plug connector. [COLOR="navy"]Control unit[/COLOR] The control electronics is accommodated in the control unit. [COLOR="navy"]Operating panel[/COLOR] The switches for sidelights/dipped beam, fog lights/rear fog lights as well as the dimmer for headlight vertical aim control and instrument lighting are integrated in the operating panel. The operating panel can be replaced separately from the control unit. If replacement is necessary, corresponding reference to this is made in the test module. [COLOR="navy"]Lamp monitoring[/COLOR] The lamps are monitored in OFF and ON status. Cold monitoring in the OFF status takes place by briefly switching on the lamp (so short that the lamp does not light up). The lamp current is monitored and an assessment is made as to whether the lamp is defective or not. [COLOR="darkred"]Note[/COLOR] If the battery voltage drops below approx. 9.5 V, the lamp status can no longer be monitored or output. [COLOR="navy"]Activating indicator lamps in the instrument cluster[/COLOR] The indicator lamps for left direction indicator, right direction indicator, rear fog lights, fog lights, full beam as well as the LEDs in the pictogram incorporated in the instrument cluster are activated via the K-bus. [COLOR="navy"]Emergency mode[/COLOR] Independent hardware is provided in order to maintain the functions necessary for driving safety in the event of the control unit failing. If the light switching centre is in emergency mode, •Tail lights and dipped beam lights are switched on at terminal 15 irrespective of the position of the corresponding light switch •Left and right brake lights are switched on at terminal 15 and the brake light switch operated •Direction indicators, hazard warning lights, full beam, headlight flasher, fog lights and rear fog lights cannot be switched on. •Diagnosis is not possible If in emergency mode, the light switching centre must be replaced.[/COLOR] from : [url]http://wds.spaghetticoder.org/en/zinfo/FOI0398FB-046613101.htm[/url] [/QUOTE]
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