Heater Main Relay: Inspection

REMOVE HEATER MAIN RELAY (Marking: HTR) FROM ENGINE ROOM J/B

Fig 1: Identifying Location Of Heater Main Relay (Marking: HTR) In Engine Room J/B
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
INSPECT HEATER MAIN RELAY
1. Inspect the relay continuity.
  1. Using an ohmmeter, check that there is continuity between terminals 1 and 2.
    If there is no continuity, replace the relay.
  2. Check that there is continuity between terminals 3 and 4.
    If there is no continuity, replace the relay.
  3. Check that there is no continuity between terminals 3 and 5.
    If there is continuity, replace the relay.
    
    Fig 2: Inspecting Heater Main Relay Continuity
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Inspect the relay operation.
  1. Apply battery positive voltage across terminals 1 and 2.
  2. Using an ohmmeter, check that there is continuity between terminals 3 and 5.
    If there is no continuity, replace the relay.
  3. Check that there is no continuity between terminals 3 and 4.
    If there is continuity, replace the relay.
    
    Fig 3: Inspecting Heater Main Relay Operation
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
REINSTALL HEATER MAIN RELAY