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.

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