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

G39-5 (RDFG) - G39-4 (GND)

R - W-B

Rear window defogger signal

Engine switch on (IG), rear window defogger switch off

11 to 14 V

G39-5 (RDFG) - G39-4 (GND)

R - W-B

Rear window defogger signal

Engine switch on (IG), rear window defogger switch on

Below 1 V

G39-14 (LIN1) - G39-4 (GND)

BE - W-B

LIN communication line

Engine switch on (IG)

Pulse generation

CHECK REAR WINDOW DEFOGGER SWITCH (AIR CONDITIONING CONTROL ASSEMBLY)

(a) Disconnect the G23 air conditioning control 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

G23-8 (IG+) - G23-4 (E)

R - W-B

Power source (IG)

Engine switch on (IG)

11 to 14 V

G23-8 (IG+) - G23-4 (E)

R - W-B

Power source (IG)

Engine switch off

Below 1 V

G23-4 (GND) - Body ground

W-B - Body ground

Ground

Always

Below 1 Ω

(c) Reconnect the G23 air conditioning control assembly connector.

(d) Check for pulses according to the value(s) in the table below.

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

G23-3 (LIN1) - G23-4 (E)

LG - W-B

LIN communication line

Engine switch on (IG)

Pulse generation

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