Blower Regulator Control
WARNING: This page is about a different car, the 2000 Mercedes-Benz C43, 2000 Mercedes-Benz C280, 1999 Mercedes-Benz C43, and 1999 Mercedes-Benz C280. However, it is still accessible from the selected car via links, so may be relevant.
Turn ignition off. Connect test cable to A/C push button control module harness connectors. See Figure. Ensure A/C push button control module is connected to test harness. Connect voltmeter negative lead to socket box terminal No. 12 and positive lead to terminal No. 7. Turn ignition on. Use voltmeter to measure voltage with blower motor knob in specified positions. See BLOWER REGULATOR SPECIFICATIONS table. If voltage is not within specification, possible cause is wiring harness failure or A/C push button control module failure.
BLOWER REGULATOR SPECIFICATIONS
| Blower Switch Position | Voltage |
|---|---|
| 1 | 1.1-1.8 |
| 2 | 2.0-2.6 |
| 3 | 2.8-3.2 |
| 4 | 3.6-4.2 |
| 5 | 5.0-6.0 |