A/C AMPLIFIER INSPECTION

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1. Connect the A/C amplifier connector.

2. Turn the engine switch to the ON position.

3. Connect the negative (-) lead of the tester to body ground.

4. By inserting the positive (+) lead of the tester into each A/C amplifier terminal, measure the voltage according to the terminal voltage table.

• If there is any malfunction, inspect the parts under “Inspection item (s)”.

― If the parts under “Inspection item (s)”, replace the A/C amplifier.

Terminal Voltage Table

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Terminal

Signal name

Connected to

Measurement condition

Voltage (V)

Inspection item (s)

1A

IG2

A/C2 10 A fuse

Engine switch at ON position

B+

•  Inspect for continuity or short circuit (A/C amplifier—A/C2 10 A fuse:1A—A/C2 10 A fuse

•  Inspect A/C2 10 A fuse

Engine switch at LOCK position

Below 1.0

•  Inspect short circuit (A/C amplifier—A/C2 10 A fuse:1A—A/C2 10 A fuse)

1B

A/C

A/C relay

A/C switch OFF

B+

•  Inspect or continuity or short circuit (A/C amplifier—A/C relay:1B—Inspect A/C relay

A/C switch ON

Below 1.0

•  Inspect terminal voltage of A/C amplifier (1A)

1C

GND

Ground

Under any condition

Below 1.0

•  Inspect for continuity (A/C amplifier—ground:1C—GND)

Terminal	Signal name	Connected to	Measurement condition	Voltage (V)	Inspection item (s)
1A	IG2	A/C2 10 A fuse	Engine switch at ON position	B+	• Inspect for continuity or short circuit (A/C amplifier—A/C2 10 A fuse:1A—A/C2 10 A fuse • Inspect A/C2 10 A fuse
Engine switch at LOCK position	Below 1.0	• Inspect short circuit (A/C amplifier—A/C2 10 A fuse:1A—A/C2 10 A fuse)
1B	A/C	A/C relay	A/C switch OFF	B+	• Inspect or continuity or short circuit (A/C amplifier—A/C relay:1B—Inspect A/C relay
A/C switch ON	Below 1.0	• Inspect terminal voltage of A/C amplifier (1A)
1C	GND	Ground	Under any condition	Below 1.0	• Inspect for continuity (A/C amplifier—ground:1C—GND)

Thermistor Side

1. Connect the thermistor connector.

2. Turn the engine switch to the ON position.

3. Turn the fan switch ON.

4. Turn the A/C switch ON.

5. Connect the positive (+) probe of the voltmeter to terminal 2A of the thermistor connector and the negative (-) probe to terminal 2B. (The wiring harness connector must be connected to the thermistor connector.)

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6. If there is any malfunction, replace the A/C amplifier.