2. Disconnect the heater fan resistor connector.
3. Disconnect the heater fan speed switch connector.
4. Check continuity between ground and terminals "1", "2", "4" And "5" heater fan speed switch connector.
If continuity is present, repair the short in the wiring harness-heater fan motor, heater fan resistor and heater fan speed switch, if there is no continuity, proceed to step #5.
5. Check up conductivity between conclusions of sockets of the switch of speed of rotation of the fan of a heater and the resistor of the fan of a heater according to the table.
If there is continuity, proceed to step #6, if not, check the wiring harness between, the heater fan speed switch and the heater fan resistor.
6. Check the heater fan speed, if OK, replace the heater fan resistor, otherwise, replace the heater fan speed switch.