Heater Control Assembly: Inspection

WARNING: This page is about a different car, the 2002 Toyota Tundra. However, it is still accessible from the selected car via links, so may be relevant.

Inspect blower speed control switch continuity.

Fig 1: Displaying Blower Speed Control Switch & Terminal
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 2: Checking Blower Speed Control Switch Continuity
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

If continuity is not as specified, replace the switch and check bulb.
Inspect def. mode switch.
1. Check the continuity exists between terminals 1 and 3 of blower switch connector, when turn the mode selector to DEF. position and F/DEF. position.
  
  Fig 3: Displaying Def. Mode Switch & Terminal
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  If no continuity exists, proceed to step b.
2. Check the continuity exists between terminals of A/C mode switch.
  
  Fig 4: Checking Continuity Between Terminals Of A/C Mode Switch.
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  If no continuity exists, replace the A/C mode switch. If continuity exists, check or replace heater control housing base.