When a blower motor resistor fails, the blower motor will only operate in one speed; this is often the first and only sign of a faulty blower motor resistor. This malfunction occurs because the resistor regulates the amount of current flowing to the blower motor in relation to the position of the fan speed control knob. Since the blower motor switch in a 2007 Nissan Versa is located behind the brake pedal assembly, a number of components must be disassembled in order to perform this repair.
Shut off the engine and open the hood. Disconnect the negative battery terminal with a metric box-end wrench.
Open the driver’s side door and remove the fuse panel cover. Remove the screws holding the lower panel finisher with a metric nut driver. Pull the lower panel finisher away from the dashboard until it pops loose. Disconnect the diagnostic data port’s electrical connector and remove the finish panel from the vehicle.
Disconnect the accelerator pedal position sensor’s electrical connector. Remove the stop lamp switch from the brake pedal assembly by gently popping it loose.
Remove the snap and clevis pins from the brake booster with a small flat-head screwdriver and needle-nose pliers. Remove the nuts holding the brake pedal assembly bracket to the vehicle with a metric socket and a ratchet. Remove the brake pedal assembly from the vehicle.
Locate the blower motor resistor. It is situated directly behind the brake pedal assembly on the rear of the firewall. It is held in place by two screws and is rectangular in shape. Disconnect the blower motor resistor’s electrical connector. Remove the screws holding the blower motor resistor to the vehicle with a screwdriver and remove it from the vehicle.
Set the new blower motor resistor in place and reinstall its retaining screws. Reconnect its electrical connector.
Inspect the brake pedal assembly for deformations, bends, cracks, and any sub-standard condition. Measure the lapping length of the sub-bracket and side plate with a metric caliper. Ensure that the length is at least 6.9 mm. If any of these conditions are out of specification, replace the brake pedal assembly before proceeding.
Set the brake pedal assembly in place and reinstall the nuts holding the brake pedal assembly to the vehicle with a metric ratchet and socket. Reinstall the snap and clevis pins to their original location.
Reinstall the stop lamp switch into the brake pedal assembly. Check the brake pedal assembly to ensure that it operates properly.
Set the lower panel finisher into place and press down on it until it snaps into position. Reinstall the lower panel finisher screws. Reconnect the diagnostic data port’s electrical connector and reinstall the fuse panel cover.
Reconnect the negative battery terminal. Turn on the ignition and test the blower motor to ensure that it operates properly at all speeds.
