Blower Motor Relay: Testing and Inspection

Heater Relay Inspection
1. Disconnect the heater relay connector.




2. Check continuity between terminals of the relay.








3. Apply 12V to terminal d and ground terminal a; then check for continuity between terminals of the relay.






Ex-HI Relay Inspection
1. Disconnect the Ex-Hi relay connector.




2. Check for continuity between terminals c and d of the relay.









3. Apply 12V to terminal a and ground terminal b. Check for continuity between terminals c and d of the relay.






Ign Relay (except Non-Turbo M/T) Inspection
1. Remove the blower unit.
2. Disconnect the Ign relay connector.




3. Check for continuity between terminals c and d of the relay.








4. Apply 12V to terminal a and ground terminal b. Check for continuity between terminals c and d of the relay.






Power Transistor Inspection
1. Remove the blower unit.
2. Disconnect the power transistor connector.




3. Make the test circuit.
4. Measure the voltage between a and b terminals and the current as shown.





Note: When SW1 is ON, remove the ammeter and reconnect the circuit.

5. If the voltage or current is not within specification, replace the power transistor.