Toyota 4Runner manuals

Toyota 4Runner: 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.

(c) Reconnect the F42 air conditioning amplifier connector.

(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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