Toyota Venza manuals

Toyota Venza: Terminals Of Ecu

TERMINALS OF ECU

1. CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY

(a) Disconnect the D47 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.

Tester Connection

Wiring Color

Terminal Description

Condition

Specified Condition

D47-1 (IG+) - D47-14 (GND)

Y - W

Power source (IG)

Ignition switch ON

11 to 14 V

D47-1 (IG+) - D47-14 (GND)

Y - W

Power source (IG)

Ignition switch off

Below 1 V

D47-21 (B) - D47-14 (GND)

V - W

Power source (Back-up)

Always

11 to 14 V

D47-14 (GND) - Body ground

W - Body ground

Ground

Always

Below 1 Ω

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

(c) Reconnect the D47 air conditioning amplifier assembly connector.

(d) Measure the voltage and check for pulses according to the value(s) in the table below.

Tester Connection

Wiring Color

Terminal Description

Condition

Specified Condition

D47-18 (D) - D47-14 (GND)

G - W

Rear defogger signal

Ignition switch ON, rear window defogger switch off

11 to 14 V

D47-18 (D) - D47-14 (GND)

G - W

Rear defogger signal

Ignition switch on, rear window defogger switch ON

Below 1 V

D47-37 (LIN1) - D47-14 (GND)

SB - W

LIN communication line

Ignition switch ON

Pulse generation

If the result is not as specified, the air conditioning amplifier assembly may have a malfunction.

2. CHECK AIR CONDITIONING CONTROL ASSEMBLY

(a) Disconnect the E3 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.

Tester Connection

Wiring Color

Terminal Description

Condition

Specified Condition

E3-4 (IG+) - E3-5 (GND)

GR - W

Power source (IG)

Ignition switch ON

11 to 14 V

E3-4 (IG+) - E3-5 (GND)

GR - W

Power source (IG)

Ignition switch off

Below 1 V

E3-5 (GND) - Body ground

W - Body ground

Ground

Always

Below 1 Ω

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

(c) Reconnect the E3 air conditioning control assembly connector.

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

Tester Connection

Wiring Color

Terminal Description

Condition

Specified Condition

E3-2 (LIN1) - E3-5 (GND)

SB - W

LIN communication line

Ignition switch ON

Pulse generation

If the result is not as specified, the air conditioning control assembly may have a malfunction.

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 ...

Windshield Deicer does not Operate
DESCRIPTION When the rear window defogger switch on the air conditioning control assembly is pressed, the operation signal is transmitted to the air conditioning amplifier assembly through the LI ...

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