Possible malfunctions of the heater electric motor (VAZ-21011)

Cause	Method of elimination
The electric motor does not work
The wires are damaged or the wire connections are oxidized	Check and repair connections. Replace damaged wires
Fuse 2 in the fuse box has blown	Replace the fuse
The heater switch is damaged - voltage is not supplied to the output terminals of the switch	Check the switch, replace with a new one if necessary
Sticking or wear of the electric motor brushes, breakage in the armature winding or contamination of the commutator	Check the electric motor, repair or replace
Short circuit to ground of the armature winding - when the electric motor is turned on, the fuse burns out	Replace the electric motor
The electric motor only operates at one speed
The wires are damaged or the wire connections are oxidized	Replace damaged wires, strip wire ends
The heater switch is damaged	Replace the switch
The additional resistor burned out	Replace the resistor
The motor anchor rotates slowly
Contamination or oxidation of the collector, wear of the brushes	Clean the commutator, replace the brushes
Interturn short circuit in the armature winding	Replace the electric motor
Seizure of the anchor shaft in the bearings	Disassemble the electric motor, clean the shaft journals
The instrument fuse keeps blowing
The instrument protection diode is broken	Replace the damaged diode
The coolant temperature gauge needle is constantly at the beginning of the scale
The device is damaged	Replace the instrument or instrument cluster
The device sensor is faulty	Replace the sensor
The wires are damaged or their tips are oxidized	Check the wires, restore the connections
The nuts securing the device have come loose	Tighten the nuts
The coolant temperature gauge needle is constantly in the red zone
The device is damaged	Replace the instrument or instrument cluster
The device sensor is faulty	Replace the sensor
The wire going to the sensor is shorted to ground	Check and eliminate the short circuit
The nuts securing the device have come loose	Tighten the nuts
The fuel gauge needle is constantly at the beginning of the scale
The device is damaged	Replace the instrument or instrument cluster
The wires are damaged or their tips are oxidized	Check the wires, restore the connections
The sensor is damaged:
– break in the sensor flexible bus;	- solder the tire or replace the sensor;
- break in the resistor winding;	– replace the sensor;
- weak contact of the resistor current collector;	- bend the contact;
- the float is not tight	- replace the float
The nuts securing the device have come loose	Tighten the nuts
The fuel gauge needle is constantly at the end of the scale
The device is damaged	Replace the device
The sensor flexible bus is shorted to the fuel intake tube	Bend the tire
The wire connecting to the sensor is shorted to ground	Check and eliminate the short circuit
The nuts securing the device have come loose	Tighten the nuts
The fuel gauge needle returns to the beginning of the scale when the tank is full
The float travel limiter is not installed correctly (the resistor winding is running out)	Bend the limiter down 1-2 mm
The fuel gauge needle moves in jumps and often drops to the beginning of the scale
Weak contact of the sensor resistor with the current collector	Bend the current collector
Sensor resistor winding breakage	Replace the sensor
The fuel reserve indicator light is constantly on
Short circuit of sensor wire to ground	Check and eliminate the short circuit
Short circuit of the flexible bus of the sensor with the fuel intake tube	Bend the tire
Any indicator lights are not working
The light bulb burned out	Replace the lamp
Poor contact between the lamp in the socket or the socket and the printed circuit board	Restore contact
The sensor contacts have oxidized	Clean the sensor contacts
The lamp sensor is faulty	Replace the sensor
Wire breakage, oxidation of wire tips	Replace damaged wires, strip terminals
The oil pressure warning light is constantly on or goes out only at high engine speeds
Low oil pressure	Check the engine
Sensor wire shorted to ground	Check and eliminate the short circuit
The sensor is faulty	Replace the sensor
Parking brake indicator light does not flash (it's on constantly)
Break in the relay-breaker winding (there is no circuit between the "–" and "+" plugs)	Replace the relay-breaker
Open circuit in the wire connecting the "-" plug of the circuit breaker relay to the "I" plug of the fuse box	Check and replace the damaged wire
The speedometer does not work
The nuts securing the flexible shaft ends of the speedometer drive are not tightened	Check, tighten the nuts
Flexible drive shaft breakage	Replace the flexible shaft
The speedometer mechanism is damaged	Replace the speedometer or instrument cluster
Speedometer Flexible Shaft Noise
The flexible drive shaft casing is deformed (dents, bends, etc.)	Replace the flexible shaft
Flexible shaft installation is performed with bending radii less than 100 mm	Correct the flexible shaft installation