Toyota Venza: Terminals Of Ecu

Toyota Venza Service Manual / Window / Glass / Windshield Deicer System / 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.

(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.

(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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