Toyota Highlander Service Manual: On-vehicle inspection

Toyota Highlander Service Manual / Heater & air conditioner / Air conditioning system / On-vehicle inspection

1. INSPECT PRESSURE SWITCH NO.1.

INSPECT PRESSURE SWITCH NO.1.

(a) Magnetic clutch control: Inspect pressure switch operation.

Set on the manifold gauge set.
Connect the positive (+) lead from the ohmmeter to terminal 4 and the negative (-) lead to terminal 1.
Check continuity between terminals when refrigerant pressure is changed, as shown in the illustration.

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

INSPECT PRESSURE SWITCH NO.1.

(b) Cooling fan control: Inspect pressure switch operation.

Connect the positive (+) lead from the ohmmeter to terminal 2 and the negative (-) lead to terminal 3.
Check continuity between terminals when refrigerant pressure is changed, as shown in the illustration.

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

2. INSPECT AIR CONDITIONER AMPLIFIER ASSY CIRCUIT

INSPECT AIR CONDITIONER AMPLIFIER ASSY CIRCUIT

(a) Disconnect the connectors from the A/C amplifier assy and inspect the connector on the wire harness side, as shown the chart.

INSPECT AIR CONDITIONER AMPLIFIER ASSY CIRCUIT

If the circuit is as specified, try to replace the A/C amplifier assy with a new one. If the circuit is as specified, inspect the circuits connected to other parts.

INSPECT AIR CONDITIONER AMPLIFIER ASSY CIRCUIT

(b) Connect the connector to A/C amplifier assy and inspect the wire harness side connector from the back side, as shown in the chart.

INSPECT AIR CONDITIONER AMPLIFIER ASSY CIRCUIT

*1:If the circuit is as specified, try to replace the A/C amplifier assy with a new one. If the circuit is as specified, inspect the circuits connected to other parts.

*2: w/ Navigation System.

*3: w/o Navigation System.

Precaution

1. DO NOT HANDLE REFRIGERANT IN AN ENCLOSED AREA OR NEAR AN OPEN FLAME 2. ALWAYS WEAR EYE PROTECTION 3. BE CAREFUL NOT TO GET LIQUID REFRIGERANT IN YOUR EYES OR ON YOUR SKIN If liquid refr ...

Inspection

1. COOLER THERMISTOR NO.1(MANUAL AIR CONDITIONER) (a) Remove cooler thermistor No. 1. (b) Check resistance between terminals 1 and 2 of cooler thermistor No. 1 at each temperature, as shown in ...

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