Heater Main Relay: Inspection

WARNING: This page is about a different car, the 2003 Lexus IS 300. However, it is still accessible from the selected car via links, so may be relevant.

REMOVE FRONT DOOR SCUFF PLATE LH See FRONT DOOR SCUFF PLATE .
REMOVE COWL SIDE TRIM BOARD LH See COWL SIDE TRIM BOARD .
REMOVE HEATER MAIN RELAY
1. Disconnect the connectors.
2. Remove the 2 passenger side junction block set nuts .
  
  Fig 1: Removing Heater Main Relay Passenger Side Junction Block Set Nuts
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Remove the heater main relay from passenger side junction block.
Fig 2: Removing Heater Main Relay From Passenger Side Junction Block
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
INSPECT HEATER MAIN RELAY CONTINUITY

Fig 3: Relay Continuity Condition Chart
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 4: Inspecting Heater Main Relay Continuity
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

If continuity is not as specified, replace the relay.
INSTALL HEATER MAIN RELAY
1. Install the heater main relay to passenger side junction block.
2. Install the passenger side junction block set nuts.
3. Connect the connectors.
INSTALL COWL SIDE TRIM BOARD LH
INSTALL FRONT DOOR SCUFF PLATE LH