| 摘要 |
A diagnostic system for a ballast of a high-pressure gas discharge lamp in a motor vehicle includes the ballast and a separate light control module that controls the ballast via a supply line and in case of a fault, the ballast gives a modulated diagnostic signal via the supply line to the light control module. For this, in case of a fault, the ballast modulates a current that is received, using a switchable current sink, such that the light control module receives coded diagnostic information via the supply line.
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