Component Tests and General Diagnostics

INSPECTION







1. COOLER THERMISTOR NO.1
a. Check resistance between terminals 1 and 2 of cooler thermistor No. 1 at each temperature, as shown in the chart.
If resistance value is not as specified, replace the sensor.

2. COMBINATION SWITCH ASSEMBLY

Standard Resistance:

a. Inspect blower switch.
1 Measure the resistance according to the value(s) in the table.
If the resistance is not as specified, replace the combination switch assembly.

b. Inspect illumination operation.
1 Connect the positive (+) lead from the battery to terminal 8 and the negative (-) lead to terminal 3, then check that the illuminations light up.
If the bulb does not light up, replace the bulb.

c. Inspect A/C switch.

Standard Resistance:

1 Measure the resistance according to the value(s) in the table.
If the resistance is not as specified, replace the combination switch assembly.

d. Inspect indicator operation.
1 Connect the positive (+) lead from the battery to terminal 2 and the negative (-) lead to terminal 4 while the A/C switch is pressed, then check that the indicator lights up.
If operation is not as specified, replace the combination switch assembly.

e. Inspect R/F switch.

Standard Resistance:

1 Measure the resistance according to the value(s) in the table below.
If the resistance is not as specified, replace the combination switch assembly.

f. Inspect indicator operation.
1 Connect the positive (+) lead from the battery to terminal 9 and the negative (-) lead to terminal 8 while the RIF switch is pressed, then check that the indicator lights up.
If operation is not as specified, replace the combination switch assembly.

g. Inspect illumination operation.
1 Connect the positive (+) lead from the battery to terminal 10 and the negative (-) lead to terminal 5, then check that the illuminations light up.
If the bulb does not light up, replace the bulb.

h. Inspect defroster mode detection switch.

Standard Resistance:

1 Measure the resistance according to the value(s) in the table below.
If the resistance is not as specified, replace the combination switch assembly.

3. BLOWER RESISTOR

Standard Resistance:

a. Measure the resistance according to the value(s) in the table.
If the resistance is not as specified, replace the blower resistor.

4. BLOWER W/FAN MOTOR SUB-ASSEMBLY




a. Connect the positive (+) lead from the battery to terminal 2 and the negative (-) to terminal 1, then check that the motor operation smoothly.
If operation is not as specified, replace the blower motor.

5. HEATER BLOWER MOTOR RELAY ASSEMBLY

Standard Resistance:

a. Measure the resistance according to the value(s) in the table.
If the resistance is not as specified, replace the heater blower motor relay assembly.

6. MAGNETIC CLUTCH RELAY

Standard Resistance:

a. Measure the resistance according to the value(s) in the table.
If the resistance is not as specified, replace the magnetic clutch relay.