Toyota Venza: Terminals Of Ecu

Toyota Venza Service Manual / Door / Hatch / Power Back Door System / Terminals Of Ecu

TERMINALS OF ECU

1. CHECK POWER BACK DOOR ECU (POWER BACK DOOR MOTOR UNIT)

(a) Disconnect the L20 ECU connector.

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

Tester Connection	Wiring Color	Terminal Description	Condition	Specified Condition
L20-10 (ECUB) - Body ground	P - Body ground	Battery power supply	Always	11 to 14 V
L20-12 (B) - Body ground	LG - Body ground	Battery power supply	Always	11 to 14 V
L20-8 (IG) - Body ground	SB - Body ground	IG power supply	Ignition switch ON	11 to 14 V
L20-8 (IG) - Body ground	SB - Body ground	IG power supply	Ignition switch off	Below 1 V
L20-17 (MSW) - Body ground	R - Body ground	Power back door main switch signal	Power back door main switch not pushed	Below 1 Ω
L20-17 (MSW) - Body ground	R - Body ground	Power back door main switch signal	Power back door main switch pushed	10 kΩ or higher
L20-4 (DS1) - Body ground	L - Body ground	Power back door closer switch signal	Power back door closer switch on	Below 1 Ω
L20-4 (DS1) - Body ground	L - Body ground	Power back door closer switch signal	Power back door closer switch off	10 kΩ or higher
L20-15 (OSL) - L20-14 (OSE)	Y - V	Power back door touch sensor LH signal	Power back door touch sensor LH not pressed	950 to 1050 Ω
L20-15 (OSL) - L20-14 (OSE)	Y - V	Power back door touch sensor LH signal	Back door touch sensor LH pressed	Below 100 Ω
L20-13 (OSR) - L20-14 (OSE)	R - V	Power back door touch sensor RH signal	Back door touch sensor RH not pressed	950 to 1050 Ω
L20-13 (OSR) - L20-14 (OSE)	R - V	Power back door touch sensor RH signal	Power back door touch sensor RH pressed	Below 100 Ω
L20-11 (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.

(d) Initialize the power back door system (See page ).

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

Tester Connection	Wiring Color	Terminal Description	Condition	Specified Condition
L20-17 (MSW) - Body ground	R - Body ground	Power back door main switch signal	Power back door main switch not pushed	Below 1 V
L20-17 (MSW) - Body ground	R - Body ground	Power back door main switch signal	Power back door main switch pushed	Pulse generation
L20-26 (BZR+) - Body ground	SB - Body ground	Power back door warning buzzer signal input	Back door warning buzzer sounding	Pulse generation
L20-26 (BZR+) - Body ground	SB - Body ground	Power back door warning buzzer signal input	Back door warning buzzer stopped	Below 1 V
L20-2 (DC+) - L20-1 (DC-)	L - G	Power back door lock motor signal	Back door lock motor operating	11 to 14 V
L20-2 (DC+) - L20-1 (DC-)	L - G	Power back door lock motor signal	Back door lock motor stopped	Below 1 V
L20-4 (DS1) - Body ground	L - Body ground	Power back door closer switch signal	Power back door closer switch on	Below 1 V
L20-4 (DS1) - Body ground	L - Body ground	Power back door closer switch signal	Power back door closer switch off	Pulse generation
L20-15 (OSL) - L20-14 (OSE)	Y - V	Power back door touch sensor LH signal	Power back door touch sensor LH not pressed	4 to 6 V
L20-15 (OSL) - L20-14 (OSE)	Y - V	Power back door touch sensor LH signal	Back door touch sensor LH pressed	Below 1 V
L20-13 (OSR) - L20-14 (OSE)	R - V	Power back door touch sensor RH signal	Back door touch sensor RH not pressed	4 to 6 V
L20-13 (OSR) - L20-14 (OSE)	R - V	Power back door touch sensor RH signal	Power back door touch sensor RH pressed	Below 1 V

If the result is not as specified, the ECU may have a malfunction.

2. CHECK MAIN BODY ECU (DRIVER SIDE JUNCTION BLOCK ASSEMBLY)

(a) Disconnect the D49 and 2F connectors.

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

Tester Connection	Wiring Color	Terminal Description	Condition	Specified Condition
D49-2 (BDSU) - Body ground	GR - Body ground	Back door opener switch signal circuit	Back door opener switch on	Below 1 Ω
D49-2 (BDSU) - Body ground	GR - Body ground	Back door opener switch signal circuit	Back door opener switch off	10 kΩ or higher
D49-26 (PBDS) - Body ground	BR - Body ground	Power back door open / close switch signal circuit	Power back door open / close switch on	Below 1 Ω
D49-26 (PBDS) - Body ground	BR - Body ground	Power back door open / close switch signal circuit	Power back door open / close switch off	10 kΩ or higher
2F-16 (GND1) - 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.

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

Tester Connection	Wiring Color	Terminal Description	Condition	Specified Condition
D49-26 (PBDS) - Body ground	BR - Body ground	Power back door control switch signal	Power back door control switch on	Below 1 V
D49-26 (PBDS) - Body ground	BR - Body ground	Power back door control switch signal	Power back door control switch off	Pulse generation
D49-2 (BDSU) - Body ground	GR - Body ground	Back door opener switch signal	Back door opener switch on	Below 1 V
D49-2 (BDSU) - Body ground	GR - Body ground	Back door opener switch signal	Back door opener switch off	Pulse generation

If the result is not as specified, the ECU may have a malfunction.

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