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The nature of such a malfunction may be different: either the illumination of the climate control is not included at all or only from time to time. The first situation talks about the burned light bulb, the second one is about the outgoing contacts. There is a light bulb for each handle. In order to gain access to them, the handle needs to pull the handle. Next, we need to check the contact, put your finger on the light bulb. If it doesn't help, change the light for a new one.