a) Check for constant conductivity between terminals "2" and "4".
b) Check for conductivity between terminals "1" and "3".
c) Check for conductivity between terminals "1" and "5".
d) Check for conductivity between terminals "1" and "5" and for absence of conductivity between terminals "1" and "3" of the relay when applying battery voltage to terminals "2" and "4".
2. Checking fan relay #3.
a) Check for constant conductivity between terminals "2" and "3".
b) Check for conductivity between terminals "1" and "4".
c) Check for conductivity between terminals "1" and "4" of the relay when applying battery voltage to terminals "2" and "3".
3. Checking the EX-HI relay (push button panel type).
a) Check for constant conductivity between terminals "2" and "3".
b) Check for conductivity between terminals "1" and "4".
c) Check for conductivity between terminals "1" and "4" of the relay when applying battery voltage to terminals "2" and "3".
4. Checking the fan speed switch of the heating and air conditioning system (lever type panel).
Check for continuity between the terminals at different positions of the fan speed switch.
5. Checking the idle speed increase relay when the heater is turned on (for 2C with push-button panel type).
a) Check for conductivity between terminals "2" and "3".
b) Check for conductivity between terminals "1" and "4".
c) Check for conductivity between terminals "1" and "4" of the relay when applying battery voltage to terminals "2" and "3".
6. Checking the operation of the fan motor.
a) Connect the battery to terminals "1" (+) and "2" (-) of the connector, check the smooth rotation of the rotor.
b) Measure the motor current.
- Nominal current - less than 3 A
7. Checking for conductivity between the terminals of the "A" and "B" connectors of the control panel (push button panel type) at different positions of the fan speed switch.
The official source is on the portal TOYOTAMAN