Air Conditioning System: Inspection

1. Check resistance between terminals 1 and 2 of cooler thermistor No. 1 at each temperature, as shown in the chart.

   Resistance: 

Fig 1: Checking Resistance Between Terminals 1 And 2 Of Cooler Thermistor

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Fig 2: Resistance Graph

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If resistance value is not as specified, replace the sensor.

1. Inspect blower switch continuity.
   TESTER CONNECTION SPECIFIED CONDITION
   
   

   Condition/Circuit	Tester connection	Specified condition
   OFF	-	No continuity
   LO	1-8	Continuity
   M1	1-6-8	Continuity
   M2	1-5-8	Continuity
   HI	1-4-8	Continuity

   If continuity is not as specified, replace the air conditioner control assy,

   Fig 3: Identifying Blower Switch Connector

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2. Inspect illumination operation.

   Connect the positive (+) lead from the battery to terminal 2 and negative (-) lead to terminal 3 then check that the illuminations light up.

   If there is bulb not light up, replace the bulb.

1. Inspect switch continuity.

   Check the continuity between terminals while switch is pressed, as shown in the chart.

   TESTER CONNECTION SPECIFIED CONDITION
   
   

   Tester connection	Specified condition
   2-5	Continuity

   If continuity is not as specified, replace the cooler switch.

2. Inspect illumination operation.

   Connect the positive (+) lead from the battery to terminal 4 and negative (-) lead to terminal 3 then check that the illuminations light up.

   If operation is not as specified, replace the cooler switch.

   Fig 4: Identifying Cooler Switch Connector

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3. Inspect indicator operation.
   1. Connect the positive (+) lead from the battery to terminal 2 and the negative (-) lead to terminal 1.
   2. Push the A/C button in and then check that the indicator lights up.

      If operation is not as specified, replace the cooler switch.

4. Inspect dimming operation
   1. Connect the positive (+) lead from the battery to terminal 2 and the negative (-) lead to terminal 1 while press the switch.
   2. Connect the positive (+) lead from battery to terminal 4 and then check that the indicator dims.

      If operation is not as specified, replace the cooler switch.

1. Measure resistance between terminals, as shown in the chart below.

If resistance is not as specified, replace the blower resistor.

Fig 5: Identifying Blower Resistor Connector

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1. Connect the positive (+) lead from the battery to terminal 2 and negative (-) to terminal 1, then check that the motor operation smoothly.

   If operation is not as specified, replace the blower motor.

Fig 6: Identifying Blower Fan Motor Connector Terminals

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If continuity is not as specified, replace the heater blower motor relay.

Fig 7: Identifying Heater Blower Motor Relay

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If continuity is not as specified, replace the magnet-clutch relay.

Fig 8: Identifying Magnet-Clutch Relay

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