Toyota 4Runner manuals

Toyota 4Runner: System Diagram


Communication Table




Communication Line

Air conditioning amplifier assembly


A/C idle up request signal


Heater idle up request signal

PTC heater control request signal*

Electricity load at low voltage state signal

Ambient temperature signal

Main body ECU

Air conditioning amplifier assembly

Main body request signal

Combination meter assembly

Air conditioning amplifier assembly

Vehicle speed signal


Air conditioning amplifier assembly

Engine coolant temperature signal

Engine speed data

Engine type information signal

Heater control assembly

Air conditioning amplifier assembly

OFF operation switch signal


A/C switch signal

Rear defogger operation switch signal

Mode operation switch signal

REC/FRS switch signal

Set temperature switch signal

Blower operation switch signal

  • *: w/ PTC Heater
System Description
SYSTEM DESCRIPTION 1. GENERAL (a) The air conditioning system has the following controls. Control Outline Manual Control The air conditioning ampli ...

How To Proceed With Troubleshooting
CAUTION / NOTICE / HINT HINT: Use these procedures to troubleshoot the air conditioning system. *: Use the Techstream. PROCEDURE 1. VEHICLE BROUGHT TO W ...

Other materials about Toyota 4Runner:

Downhill Assist Control Indicator Light does not Come ON
DESCRIPTION Even if the downhill assist control switch is pressed, the downhill assist control indicator light blinks and downhill assist control does not activate under the following conditions: The transfer is in H4. The brake system is malf ...

REASSEMBLY CAUTION / NOTICE / HINT HINT: When installing the rear spoiler protector, heat the rear spoiler surface using a heat light. Standard: Item Temperature Rear Spoiler 20 to 30°C (68 to 86°F) ...

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