Lexus ES manuals

Lexus ES: Terminals Of Ecu

TERMINALS OF ECU

CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY

*A

w/o Seat Heater

*B

w/ Seat Heater

(a) Disconnect the G39 air conditioning amplifier assembly connector.

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

HINT:

Measure the values on the wire harness side with the connector disconnected.

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

G39-2 (IG+) - G39-4 (GND)

R - W-B

Power source (IG)

Engine switch on (IG)

11 to 14 V

G39-2 (IG+) - G39-4 (GND)

R - W-B

Power source (IG)

Engine switch off

Below 1 V

G39-1 (B) - G39-4 (GND)

B - W-B

Battery power supply

Always

11 to 14 V

G39-4 (GND) - Body ground

W-B - Body ground

Ground

Always

Below 1 Ω

(c) Reconnect the G39 air conditioning amplifier assembly connector.

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

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

G39-17 (FDEF) - G39-4 (GND)

GR - W-B

Wiper Deicer signal

Engine switch on (IG), Front wiper deicer switch off

11 to 14 V

G39-17 (FDEF) - G39-4 (GND)

GR - W-B

Wiper Deicer signal

Engine switch on (IG), Front wiper deicer switch on

Below 2.2 V

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