Blower Regulator Control
WARNING: This page is about a different car, the 1999 Mercedes-Benz C230. However, it is still accessible from the selected car via links, so may be relevant.
- Turn ignition off. Disconnect A/C push-button control unit connectors. Connect socket box to A/C push-button control unit. See Figure. Connect DVOM negative lead to socket box terminal No. 12 and positive lead to terminal No. 7. Turn ignition on and measure voltage with blower switch in specified positions. See BLOWER SWITCH CIRCUIT SPECIFICATIONS table.
- If readings are not as specified, check blower switch circuit. See WIRING DIAGRAMS . If circuit is okay, replace A/C push-button control unit. See A/C PUSH-BUTTON CONTROL UNIT under REMOVAL & INSTALLATION.
BLOWER SWITCH CIRCUIT SPECIFICATIONS
| Blower Switch Position | Voltage |
|---|---|
| 0 | Zero |
| 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 |