Toyota 4Runner: Generator Signal Circuit

Toyota 4Runner Service Manual / Vehicle Interior / Heating / Air Conditioning / Air Conditioning System(for Automatic Air Conditioning System) / Generator Signal Circuit

DESCRIPTION

When the engine is started, the generator assembly turns on and a voltage pulse signal is generated.

This signal is used by the air conditioning amplifier assembly.

The signal expressing the amount of output from the generator assembly is one element of PTC heater control.

WIRING DIAGRAM

PROCEDURE

1.	CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - GENERATOR)

(a) Disconnect the F42 amplifier connector.

(b) Disconnect the C5 generator connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
F42-25 (ALT) - C5-3 (M)	Always	Below 1 Ω
F42-25 (ALT) - Body ground	Always	10 kΩ or higher

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

REPAIR OR REPLACE HARNESS OR CONNECTOR

Air Conditioning Compressor Magnetic Clutch Circuit

DESCRIPTION When the air conditioning amplifier assembly is turned on, a magnet clutch assembly signal is sent from the MGC terminal of the air conditioning amplifier assembly. Then, the A/C COMP ...

PTC Heater Circuit

DESCRIPTION PTC heater relays are closed in accordance with signals from the air conditioning amplifier assembly and power is supplied to the quick heater assembly installed on the radiator heate ...

Other materials about Toyota 4Runner:

On-vehicle Inspection
ON-VEHICLE INSPECTION PROCEDURE 1. REMOVE FRONT WHEEL 2. REMOVE DISC BRAKE CYLINDER ASSEMBLY LH 3. REMOVE FRONT DISC 4. INSPECT FRONT AXLE HUB BEARING LOOSENESS (a) Using a dial indicator, measure the looseness near the center of the ...

Integration Relay
On-vehicle Inspection ON-VEHICLE INSPECTION PROCEDURE 1. REMOVE NO. 1 RELAY BLOCK COVER (a) Remove the No. 1 relay block cover. 2. INSPECT NO. 1 INTEGRATION RELAY (a) Using a screwdriver, detach the 2 claws and disconnect the No. 1 integ ...