Toyota 4Runner: Terminals Of Ecu

Toyota 4Runner Service Manual / Vehicle Exterior / Window / Glass / Window Defogger System / Terminals Of Ecu

TERMINALS OF ECU

1. CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY

(a) Disconnect the F42 air conditioning amplifier connector.

(b) Measure the voltage and resistance according to the value(s) in the table below.

Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
F42-21 (B) - F42-14 (GND)	V - W-B	Battery power source	Always	11 to 14 V
F42-1 (IG+) - F42-14 (GND)	L - W-B	Ignition switch power supply	Ignition switch ON	11 to 14 V
F42-1 (IG+) - F42-14 (GND)	L - W-B	Ignition switch power supply	Ignition switch off	Below 1 V
F42-14 (GND) - Body ground	W-B - Body ground	Ground	Always	Below 1 Ω

If the result is not as specified, there may be a malfunction on the wire harness side.

(d) Measure the voltage according to the value(s) in the table below.

Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
F42-38 (RDEF) - F42-14 (GND)	P - W-B	Rear defogger signal	Ignition switch ON, rear window defogger switch off	11 to 14 V
F42-38 (RDEF) - F42-14 (GND)	P - W-B	Rear defogger signal	Ignition switch ON, rear window defogger switch on	Below 1 V

If the result is not as specified, there may be a malfunction in the air conditioning amplifier.

2. CHECK HEATER CONTROL ASSEMBLY

(a) Disconnect the F29 heater control connector.

(b) Measure the resistance and voltage according to the value(s) in the table below.

Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
F29-4 (IG+) - F29-11 (GND)	L - W-B	Ignition switch power supply	Ignition switch ON	11 to 14 V
F29-4 (IG+) - F29-11 (GND)	L - W-B	Ignition switch power supply	Ignition switch off	Below 1 V
F29-11 (GND) - Body ground	W-B - Body ground	Ground	Always	Below 1 Ω

If the result is not as specified, there may be a malfunction on the wire harness side.

Problem Symptoms Table

PROBLEM SYMPTOMS TABLE HINT: Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are lis ...

Data List / Active Test

DATA LIST / ACTIVE TEST 1. ACTIVE TEST HINT: Using the Techstream to perform Active Tests allows relays, VSVs, actuators and other items to be operated without removing any parts. This non-intrus ...

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 ...

Engine immobilizer system
The vehicle’s keys have built-in transponder chips that prevent the engine from starting if a key has not been previously registered in the vehicle’s on-board computer. Never leave the keys inside the vehicle when you leave the vehicle. Vehicles wi ...