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A/C Blower Regulator Control

WARNING: This page is about a different car, the 1999 Mercedes-Benz SL500 and 1998 Mercedes-Benz SL500. However, it is still accessible from the selected car via links, so may be relevant.

Connect test cable to right connector of A/C push-button control unit. Connect wiring harness to left connector of A/C push-button control unit. Turn ignition on. Connect voltmeter negative lead to socket box terminal No. 19. Connect voltmeter positive lead to socket box terminal No. 1. With blower motor speed set to maximum, voltage should be more than .5 volt. With blower motor speed set to minimum, voltage should be more than .7 volt. If voltage is not as specified, check wiring and A/C push-button control unit.

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