April 5, 2026: LEMON Manuals is launched! Read the announcement.

Window Defogger System: Inspection

INSPECT REAR WINDOW DEFOGGER SWITCH ASSY
1. Inspect the defogger switch continuity.
  1. Connect the positive (+) lead from the battery to terminal 2 and negative (-) lead to terminal 3, and then check that the indicator light will light will up.
    If the result is not as specified, replace the switch or bulb.
    
    Fig 1: Inspecting Rear Window Defogger Switch Assy
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Inspect the defogger timer operation.
  1. Connect the positive (+) lead from the battery to terminal 2 and negative (-) lead to terminal 3.
  2. Connect the positive (+) lead from the battery to terminal 6 through a 1.4 W test bulb.
  3. Push the defogger switch ON, and check that the indicator light in the switch and test bulb will light up for 12 to 18 minutes then the indicator light and test bulb will go out.
    If the result is not as specified, replace the switch.
    
    Fig 2: Inspecting Defogger Timer Operation
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

INSPECT DEFOGGER RELAY (Marking: DEF)

Remove the defogger relay from the instrument panel J/B.

Inspect the defogger relay continuity.

Standard:

Terminal Continuity Specified Condition

Terminal No.	Condition	Specified Condition
1 <==> 2	Constant	Continuity
3 <==> 5	Apply B+ Between Terminals 1 And 2	Continuity

If the result is not as specified, replace the relay.

Fig 3: Inspecting Defogger Relay

G02922356

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002