AIR CONDITIONING PANEL ASSEMBLY (for Sedan): Inspection

WARNING: This page is about a different car, the 2008 Toyota Yaris. However, it is still accessible from the selected car via links, so may be relevant.

INSPECT HEATER CONTROL BASE SUB-ASSEMBLY

Check the heater control base resistance.

Using an ohmmeter, measure the resistance and check the results in accordance with the values in the table below.

Standard resistance

TESTER CONNECTION AND SPECIFIED CONDITION

Tester Connection	Condition	Specified Condition
2 (L) - 3 (E)	Always	10 kΩ or higher
2(L)-4(B)	A/C switch OFF	10 kΩ or higher
3(E)-4(B)	Always	10 kΩ or higher
2(L)-4(B)	A/C switch ON	Below 1 Ω
5 (ILL+) - 6 (ILL-)	Always	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 (E).
2. Push the A/C switch in and check that the indicator lights up.
  Standard: Indicator lights up
  
  If the result is not as specified, replace the heater control base.
  
  Fig 1: Inspecting Heater Control Base Sub-Assembly
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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.
  Standard: Bulb illuminates
  
  If the result is not as specified, replace the bulb.

INSPECT HEATER CONTROL SUB-ASSEMBLY

Check the heater control resistance.

Using an ohmmeter, measure the resistance and check the results in accordance with the values in the table below.

Standard resistance

TESTER CONNECTION AND SPECIFIED CONDITION

Switch Position	Tester Connection	Specified Condition
OFF	ALL-5(E)	10 kΩ or higher
LO	9(LO)-5(E)	Below 1 Ω
LO-M1	9(LO)-5(E)-7(M1)	Below 1 Ω
M1	9(LO)-5(E)-7(M1)	Below 1 Ω
M1 - M2	9(LO)-5(E)-7(M1)-6 (M2)	Below 1 Ω
M2	9 (LO) - 5 (E) - 6 (M2)	Below 1 Ω
M2-HI	9 (LO) - 5 (E) - 6 (M2) -10 (HI)	Below 1 Ω
HI	9(LO)-5(E)-10(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.
  Standard: Bulb illuminates
  
  If the result is not as specified, replace the bulb.
  
  Fig 2: Inspecting Heater Control Sub-Assembly
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

INSPECT NO. 3 HEATER CONTROL KNOB

Check the No. 3 heater control knob resistance.

Using an ohmmeter, measure the resistance and check the results in accordance with the values in the table below.

Standard resistance

TESTER CONNECTION AND SPECIFIED CONDITION

Tester Connection	Condition	Specified Condition
2 (RrDEF) -1 (E)	Rr. DEF switch OFF	10 kΩ or higher
2 (RrDEF) -1 (E)	Rr. DEF 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
4 (ILL-) - 5 (ILL+) Always	Below	1 Ω
7 (V/B) - 8 (SG)	Always	Below 1 Ω

If the result is not as specified, replace the No. 3 heater control knob.

Check the Rr. DEF 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 Rr. DEF switch in and check that the indicator lights up.
  Standard: Indicator lights up
  
  If the result is not as specified, replace the No. 3 heater control knob.
  
  Fig 3: Inspecting No. 3 Heater Control Knob
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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.
  Standard: Bulb illuminates
  
  If the result is not as specified, replace the bulb.