Removal
Disconnect the wires from the battery terminals, starting with the negative terminal.
Remove the relay socket to gain access to the interior fan ECU.
Remove the front left side air supply duct.
Fig. 8.145. Accelerator pedal position sensor connector: 1 – connector
Disconnect the accelerator pedal position sensor connector (fig. 8.145).
Fig. 8.146. Removing the brake light switch: 1 – brake light switch
Remove the brake light switch by turning it a quarter turn (fig. 8.146).
Fig. 8.147. Removing the fasteners of the passenger compartment electric fan ECU: 1 – ECU mounting bolts; 2 – ECU connector
Remove the two bolts securing the interior electric fan ECU and disconnect the interior electric fan ECU connector (fig. 8.147).
Spread the ECU mounting tabs slightly.
Fig. 8.148. Cabin electric fan control unit
Remove the interior electric fan control unit (fig. 8.148).
Fig. 8.149. Removing the wiring block from the electric cabin fan: 1 – wiring block
Remove the wiring harness from the electric interior fan (fig. 8.149).
Caution: Pull the rod to return the movable part of the switch to its original position.
Installation
Fig. 8.150. Brake light switch
Install the brake light switch into the socket (fig. 8.150).
Turn the brake light switch a quarter turn clockwise.
Installation is carried out in the reverse order of removal.
Connecting the ECU
Fig. 8.151. Connecting the ECU
See Fig. 8.151
Table 8.4. Connecting the heater control panel
| Control panel contact | Purpose | Contact of a sensor or actuator |
| 1 | "Weight" | |
| 2 | turning on the 1st fan speed | Contact 1 of connector A of the resistor block |
| 3 | turning on the 2nd fan speed | Contact 2 of connector A of the resistor block |
| 4 | turning on the 3rd fan speed | Contact 3 of connector A of the resistor block |
| 5 | turning on the 4th fan speed | Contact 4 of connector A of the resistor block |
| 6 | Not used | |
| 7 | zero speed signal of electric fan | TSEKBS |
| 8 | "+" after ignition switch | |
| 9 | Request to turn on the rear window heating. | TSEKBS |
| 10 | Rear window heating switch and indicator light | TSEKBS |
| 11 | "Weight" | |
| 12 | air conditioner warning light on signal | TSEKBS |
| 13 | request to turn on the air conditioner | TSEKBS |
| 14 | "+" after ignition switch | |
| 15 | "+" side light | Instrument lighting dimmer |
Table 8.5. Purpose of contacts of the heating system ECU
| Contact | Purpose |
| 1 | Speed control 1 |
| 2 | Speed control 2 |
| 3 | Speed control 3 |
| 4 | "Weight" |
| 5 | Power supply |
Table 8.6. Purpose of contacts of the heating system ECU
| Enabled speed | Contacts for measurement | Resistance, Ohm |
| Speed 1 | 1-4 | 5,2+0,5 |
| Speed 2 | 2-4 | 3,2±0,5 |
| Speed 3 | 3-4 | 2+0,5 |