Heater Main Relay: Inspection

WARNING: This page is about a different car, the 2002 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 REMOVE FRONT DOOR SCUFF PLATE LH )
Remove Cowl Side Trim Board LH (See REMOVE COWL SIDE TRIM BOARD LH )
Remove Heater Main Relay
1. Disconnect the connectors.
2. Remove the 2 passenger side junction block set nuts.
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: Reviewing Heater Main Relay Continuity Information
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 4: Reviewing Heater Main Relay Circuit
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 (See REMOVE COWL SIDE TRIM BOARD LH )
Install Front Door Scuff Plate LH (See REMOVE FRONT DOOR SCUFF PLATE LH )