Heater, Ventilation System
Heater, Ventilation SystemDiagnostic Information: Blower Switch System
The blower motor does not function at all regardless of the switch position.
Reference Schematic: Blower Motor Controls
Prior verification and visual check
- Check to ensure that the battery voltage is normal.
Charge or replace the battery if the battery voltage is abnormal.
- Check to ensure that the fuses are normal.
When an abnormality is found with the fuses (such as blowout), check the cause of blowout (short circuit of the harness, etc.) and repair or replace the fuses accordingly in advance.
- Check to ensure that the earth point is normal.
If an abnormality is found with the earth point (such as fixing defect and significant soiling), repair and clean accordingly.
- Check to ensure that the harness and connectors are normal.
Check to ensure that the connector connection is not faulty, there is no abnormality in the harness such as scratches and breaking, and there is no short circuit with other circuits due to loosened wire in the harness.
- Check whether there is any impact caused by external electrical equipment (radio, lamp, etc.).
Turn off the power of or dismantle the external equipment to prevent any influence on the inspection and functioning of the system.
Inspection of component parts
- Check the Mirror Heater Fuse (F-16) and HVAC Fuse (FL-7).
When an abnormality is found with the fuse (such as blowout), check the cause of blowout (short circuit of the harness, etc.) and repair or replace the fuse accordingly in advance.
- Check the Blower Relay.
Check the conduction of the Blower Relay and replace accordingly if an abnormality is found.
- Check the Blower Motor Resistor.
Check the conduction of the Blower Resistor and replace accordingly if an abnormality is found.
- Check the Fan Control Switch.
Check the conduction of the Fan Control Switch and replace accordingly if an abnormality is found.
- Check the Blower Motor.
Check the conduction of the Blower Motor and replace accordingly if an abnormality is found.
Circuit inspection
- Check the following circuits to ensure that there is no disconnection, short circuit (power supply and Ground) and high resistance.
When an abnormality is found in the circuit, repair or replace it accordingly. (Each terminal NO. indicates the connector terminal at the chassis harness side.)
- Between Mirror Heater Fuse (F-16) terminal and Blower Relay terminal NO. 2
- Between Blower Relay terminal NO. 3 and Fan Control Switch terminal NO. 8
- Between HVAC Fuse (FL-7) terminal and Blower Relay terminal NO. 1
- Between Blower Relay terminal NO. 4 and Blower Motor terminal NO. 2
- Between Blower Motor terminal NO. 1 and Blower Resistor terminal NO. 1
- Between Fan Control Switch terminal NO. 1 and Ground
Not functioning when the blower motor is at Position 1 (LOW)
Prior verification and visual check
- Check to ensure that the battery voltage is normal.
Charge or replace the battery if the battery voltage is abnormal.
- Check to ensure that the fuses are normal.
When an abnormality is found with the fuses (such as blowout), check the cause of blowout (short circuit of the harness, etc.) and repair or replace the fuses accordingly in advance.
- Check to ensure that the earth point is normal.
If an abnormality is found with the earth point (such as fixing defect and significant soiling), repair and clean accordingly.
- Check to ensure that the harness and connectors are normal.
Check to ensure that the connector connection is not faulty, there is no abnormality in the harness such as scratches and breaking, and there is no short circuit with other circuits due to loosened wire in the harness.
- Check whether there is any impact caused by external electrical equipment (radio, lamp, etc.).
Turn off the power of or dismantle the external equipment to prevent any influence on the inspection and functioning of the system.
Inspection of component parts
- Check the Blower Motor Resistor.
Check the conduction of the Blower Resistor and replace accordingly if an abnormality is found.
- Check the Fan Control Switch.
Check the conduction of the Fan Control Switch and replace accordingly if an abnormality is found.
Circuit inspection
- Check the following circuits to ensure that there is no disconnection, short circuit (power supply and Ground) and high resistance.
When an abnormality is found in the circuit, repair or replace it accordingly. (Each terminal NO. indicates the connector terminal at the chassis harness side.)
- Between Blower Resistor terminal NO. 4 and Ground (Sub Junction Block 2)
Not functioning when the blower motor is at Position 2 (MEDIUM LOW)
Prior verification and visual check
- Check to ensure that the battery voltage is normal.
Charge or replace the battery if the battery voltage is abnormal.
- Check to ensure that the fuses are normal.
When an abnormality is found with the fuses (such as blowout), check the cause of blowout (short circuit of the harness, etc.) and repair or replace the fuses accordingly in advance.
- Check to ensure that the earth point is normal.
If an abnormality is found with the earth point (such as fixing defect and significant soiling), repair and clean accordingly.
- Check to ensure that the harness and connectors are normal.
Check to ensure that the connector connection is not faulty, there is no abnormality in the harness such as scratches and breaking, and there is no short circuit with other circuits due to loosened wire in the harness.
- Check whether there is any impact caused by external electrical equipment (radio, lamp, etc.).
Turn off the power of or dismantle the external equipment to prevent any influence on the inspection and functioning of the system.
Inspection of component parts
- Check the Blower Resistor.
Check the conduction of the Blower Resistor and replace accordingly if an abnormality is found.
- Check the Fan Control Switch.
Check the conduction of the Fan Control Switch and replace accordingly if an abnormality is found.
Circuit inspection
- Check the following circuits to ensure that there is no disconnection, short circuit (power supply and Ground) and high resistance.
When an abnormality is found in the circuit, repair or replace it accordingly. (Each terminal NO. indicates the connector terminal at the chassis harness side.)
- Between Blower Resistor terminal NO. 2 and Fan Control Switch terminal NO. 6
Not functioning when the blower motor is at Position 3 (MEDIUM HI)
Prior verification and visual check
- Check to ensure that the battery voltage is normal.
Charge or replace the battery if the battery voltage is abnormal.
- Check to ensure that the fuses are normal.
When an abnormality is found with the fuses (such as blowout), check the cause of blowout (short circuit of the harness, etc.) and repair or replace the fuses accordingly in advance.
- Check to ensure that the earth point is normal.
If an abnormality is found with the earth point (such as fixing defect and significant soiling), repair and clean accordingly.
- Check to ensure that the harness and connectors are normal.
Check to ensure that the connector connection is not faulty, there is no abnormality in the harness such as scratches and breaking, and there is no short circuit with other circuits due to loosened wire in the harness.
- Check whether there is any impact caused by external electrical equipment (radio, lamp, etc.).
Turn off the power of or dismantle the external equipment to prevent any influence on the inspection and functioning of the system.
Inspection of component parts
- Check the Blower Resistor.
Check the conduction of the Blower Resistor and replace accordingly if an abnormality is found.
- Check the Fan Control Switch.
Check the conduction of the Fan Control Switch and replace accordingly if an abnormality is found.
Circuit inspection
- Check the following circuits to ensure that there is no disconnection, short circuit (power supply and Ground) and high resistance.
When an abnormality is found in the circuit, repair or replace it accordingly. (Each terminal NO. indicates the connector terminal at the chassis harness side.)
- Between Blower Resistor terminal NO. 3 and Fan Control Switch terminal NO. 5
Not functioning when the blower motor is at Position 4 (HI)
Prior verification and visual check
- Check to ensure that the battery voltage is normal.
Charge or replace the battery if the battery voltage is abnormal.
- Check to ensure that the fuses are normal.
When an abnormality is found with the fuses (such as blowout), check the cause of blowout (short circuit of the harness, etc.) and repair or replace the fuses accordingly in advance.
- Check to ensure that the earth point is normal.
If an abnormality is found with the earth point (such as fixing defect and significant soiling), repair and clean accordingly.
- Check to ensure that the harness and connectors are normal.
Check to ensure that the connector connection is not faulty, there is no abnormality in the harness such as scratches and breaking, and there is no short circuit with other circuits due to loosened wire in the harness.
- Check whether there is any impact caused by external electrical equipment (radio, lamp, etc.).
Turn off the power of or dismantle the external equipment to prevent any influence on the inspection and functioning of the system.
Inspection of component parts
- Check the Blower Resistor.
Check the conduction of the Blower Resistor and replace accordingly if an abnormality is found.
- Check the Fan Control Switch.
Check the conduction of the Fan Control Switch and replace accordingly if an abnormality is found.
Circuit inspection
- Check the following circuits to ensure that there is no disconnection, short circuit (power supply and Ground) and high resistance.
When an abnormality is found in the circuit, repair or replace it accordingly. (Each terminal NO. indicates the connector terminal at the chassis harness side.)
- Between Blower Motor terminal NO. 1 and Fan Control Switch terminal NO. 4
The blower motor does not stop running.
Prior verification and visual check
- Check to ensure that the battery voltage is normal.
Charge or replace the battery if the battery voltage is abnormal.
- Check to ensure that the fuses are normal.
When an abnormality is found with the fuses (such as blowout), check the cause of blowout (short circuit of the harness, etc.) and repair or replace the fuses accordingly in advance.
- Check to ensure that the earth point is normal.
If an abnormality is found with the earth point (such as fixing defect and significant soiling), repair and clean accordingly.
- Check to ensure that the harness and connectors are normal.
Check to ensure that the connector connection is not faulty, there is no abnormality in the harness such as scratches and breaking, and there is no short circuit with other circuits due to loosened wire in the harness.
- Check whether there is any impact caused by external electrical equipment (radio, lamp, etc.).
Turn off the power of or dismantle the external equipment to prevent any influence on the inspection and functioning of the system.
Inspection of component parts
- Check the Fan Control Switch.
Check the conduction of the Fan Control Switch and replace accordingly if an abnormality is found.
Circuit inspection
- Check to ensure that there is no short circuit in the following circuits.
When an abnormality is found in the circuit, repair or replace it accordingly. (Each terminal NO. indicates the connector terminal at the chassis harness side.)
- Between Fan Control Switch terminal NO. 1 and NO. 8 (line-to-line short circuit)
- Between Fan Control Switch terminal NO. 8 and Ground