Heater Control Assembly: Inspection

WARNING: This page is about a different car, the 2004 Toyota RAV4. However, it is still accessible from the selected car via links, so may be relevant.

INSPECT ILLUMINATION OPERATION
1. Connect the battery's positive (+) lead to terminal 4 and negative (-) lead to terminal 6. Then check that the illuminations light up.
  
  Fig 1: Checking Illumination Lights Operation
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Connect the battery's positive (+) lead to terminal 1 and negative (-) lead to terminal 8. Then check that the passenger side seat belt illuminations light up.
  
  Fig 2: Checking Passenger Side Seat Belt Illumination Light Operation
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  If operation is not as specified, check the faulty bulb.
INSPECT AIR INLET CONTROL SWITCH INDICATOR OPERATION
1. Connect the positive (+) lead from the battery to terminal 1 and negative (-) lead to terminal 13.
2. Push the A/C button in and then check that the A/C indicator lights up.
  
  Fig 3: Checking Air Inlet Control Switch Indicator Operation
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  If operation is not as specified, replace the A/C switch.
INSPECT A/C SWITCH INDICATOR OPERATION
1. Connect the battery's positive (+) lead to terminal 1 and negative (-) lead to terminal 13.
2. Push the A/C button in and then check that the A/C indicator illuminates.
  
  Fig 4: Inspecting A/C Switch Indicator Operation
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  If operation is not as specified, replace the A/C switch.
INSPECT A/C SWITCH INDICATOR DIMMING OPERATION
1. Connect the battery's positive (+) lead to terminal 1 and negative (-) lead to terminal 13 while pressing the switch.
2. Connect the battery's positive (+) lead to terminal 4 and then check that the A/C indicator dims.
  
  Fig 5: Inspecting A/C Switch Indicator Dimming Operation
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  If operation is not as specified, replace the A/C switch.

INSPECT A/C SWITCH RESISTANCE

Fig 6: Inspecting A/C Switch Resistance

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

IDENTIFYING A/C SWITCH SPECIFIED CONDITIONS

Condition/Circuit	Tester Connection	Specified Condition
A/C switch OFF	-	Below 1 Ω
A/C switch ON	1 - 13	Below 1 Ω
Defroster damper control dial at "FACE - FOOT"	-	10 kΩ or higher
Defroster damper control dial at "DEF-FOOT - DEF"	1 - 13	Below 1 Ω
Illumination circuit	4 - 6	Below 1 Ω

Switch circuit:

If the result is not as specified, replace the A/C switch.

Illumination circuit:

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

INSPECT AIR INLET CONTROL SWITCH INDICATOR
1. Connect the battery's positive (+) lead to terminal 1 and negative (-) lead to terminal 12.
2. Push the air inlet control switch in and then check that the air inlet control switch illuminates.
  
  Fig 7: Inspecting Air Inlet Control Switch Indicator
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  If operation is not as specified, replace the air inlet control switch.
INSPECT AIR INLET CONTROL SWITCH INDICATOR DIMMING OPERATION
1. Connect the battery's positive (+) lead from the battery to terminal 1 and negative (-) lead to terminal 12 while pressing the switch.
2. Connect the battery's positive (+) lead from battery to terminal 4 and then check that the air inlet control switch indicator dims.
  
  Fig 8: Inspecting Air Inlet Control Switch Indicator Dimming Operation
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  If operation is not as specified, replace the air inlet control switch.

INSPECT AIR INLET CONTROL SWITCH RESISTANCE

Fig 9: Inspecting Air Inlet Control Switch Resistance

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

AIR INLET CONTROL SWITCH SPECIFIED CONDITIONS

Condition/Circuit	Tester Connection	Specified Condition
Air inlet control switch OFF	-	10 kΩ or higher
Air inlet control switch ON	1 - 12	Below 1 Ω
Defroster damper control dial at "FACE - FOOT"	-	10 kΩ or higher
Defroster damper control dial at "DEF - FOOT"	1 - 12	Below 1 Ω
Illumination circuit	4 - 6	Below 1 Ω

If continuity is not as specified, replace the air inlet control switch.

Defroster damper control dial: INSPECT AIR INLET CONTROL SWITCH INDICATOR OPERATION
1. Connect the battery's positive (+) lead to terminal 1 and negative (-) lead to terminal 12.
2. Push the air inlet control switch in and then check that the air inlet control switch illuminates.
3. Turn the defroster damper control dial to the "DEF - FOOT" position and check that the air inlet control switch indicator turns off.
  
  Fig 10: Inspecting Air Inlet Control Switch Indicator Operation Of Defroster Damper Control Dial
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  If operation is not as specified, replace the air inlet control switch.

INSPECT BLOWER SPEED CONTROL SWITCH RESISTANCE

Fig 11: Inspecting Blower Speed Control Switch Resistance

BLOWER SPEED CONTROL SWITCH SPECIFIED CONDITIONS

Position/Circuit	Tester Connection	Specified Condition
OFF	-	10 kΩ or higher
LO	1 - 8	Below 1 Ω
M1	1 - 6 - 8	Below 1 Ω
M2	1 - 5 - 8	Below 1 Ω
HI	1 - 4 - 8	Below 1 Ω

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

INSPECT REAR DEFOGGER SWITCH OPERATION (See INSPECTION )
INSPECT HAZARD WARNING SIGNAL SWITCH (See INSPECTION )