Air Conditioning Panel Assembly: Inspection

INSPECT HEATER CONTROL BASE

Check the heater control base resistance.

Measure the resistance according to the value(s) in the table below.

Standard resistance

RESISTANCE SPECIFICATION

Tester Connection	Switch Condition	Specified Condition
2 (L) - 4 (B)	A/C switch OFF	10 kΩ or higher
2 (L) - 4 (B)	A/C switch ON	Below 1 Ω

If the result is not as specified, replace the heater control base.

Check the A/C indicator operation.
1. Connect the positive (+) lead from the battery to terminal 2 (L) and the negative (-) lead to terminal 3 (E).
2. Push the air conditioning switch in and check that the indicator lights up.
  OK:
  
  Indicator lights up
  
  If the result is not as specified, replace the heater control base.
Check the illumination operation.
1. Connect the positive (+) lead from the battery to terminal 5 (ILL+) and the negative (-) lead to terminal 6 (ILL-), then check that the bulb illuminates.
  OK:
  
  Bulb illuminates
  
  If the result is not as specified, replace the bulb.
  
  Fig 1: Identifying Heater Control Base Connector Terminals
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

INSPECT HEATER CONTROL

Check the heater control resistance.

Measure the resistance according to the value(s) in the table below.

Standard resistance

RESISTANCE SPECIFICATION

Tester Connection	Switch Condition	Specified Condition
ALL - 5 (E)	OFF	10 kΩ or higher
9 (LO) - 5 (E)	LO	Below 1 Ω
9 (LO) - 5 (E) - 7 (M1)	LO-M1	Below 1 Ω
9 (LO) - 5 (E) - 7 (M1)	M1	Below 1 Ω
9 (LO) - 5 (E) - 7 (M1)-6 (M2)	M1-M2	Below 1 Ω
9 (LO) - 5 (E) - 6 (M2)	M2	Below 1 Ω
9 (LO) - 5 (E) - 6 (M2) -10 (HI)	M2-HI	Below 1 Ω
9 (LO) - 5 (E) - 10 (HI)	HI	Below 1 Ω

If the result is not as specified, replace the heater control.

Check the illumination operation.
1. Connect the positive (+) lead from the battery to terminal 2 (ILL+) and the negative (-) lead to terminal 1 (ILL-), then check that the bulb illuminates.
  OK:
  
  Bulb illuminates
  
  If the result is not as specified, replace the bulb.
  
  Fig 2: Identifying Heater Control Connector Terminals
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

INSPECT NO. 2 HEATER CONTROL KNOB

Check the No. 2 heater control knob resistance.

Measure the resistance according to the value(s) in the table below.

Standard resistance

RESISTANCE SPECIFICATION

Tester Connection	Switch Condition	Specified Condition
2 (RrDEF) -1 (E)	Rear Window Defogger switch OFF	10 kΩ or higher
2 (RrDEF) -1 (E)	Rear Window Defogger switch ON	Below 1 Ω
3 (IG) - 6 (MAX HOT)	Except MAX HOT	10 kΩ or higher
3 (IG) - 6 (MAX HOT)	MAX HOT	Below 1 Ω
7 (V/B) - 8 (SG)	Always	Below 1 Ω

If the result is not as specified, replace the No. 2 heater control knob.

Check the rear window defogger indicator operation.
1. Connect the positive (+) lead from the battery to terminal 3 (IG) and the negative (-) lead to terminal 1 (E).
2. Push the rear window defogger switch in and check that the indicator lights up.
  OK:
  
  Indicator lights up
  
  If the result is not as specified, replace the No. 2 heater control knob.
Check the illumination operation.
1. Connect the positive (+) lead from the battery to terminal 5 (ILL+) and the negative (-) lead to terminal 4 (ILL-), then check that the bulb illuminates.
  
  Fig 3: Identifying Heater Control Knob Connector Terminals
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  OK:
  
  Bulb illuminates
  
  If the result is not as specified, replace the bulb.