Toyota Venza: Terminals Of Ecu

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

TERMINALS OF ECU

1. CHECK POWER BACK DOOR ECU (POWER BACK DOOR MOTOR UNIT) (w/ POWER BACK DOOR SYSTEM)

(a) Disconnect the L20 power back door 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
L20-12 (B) - Body ground	LG - Body ground	Battery power supply	Always	11 to 14 V
L20-10 (ECUB) - Body ground	P - 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
L20-11 (GND) - Body ground	W-B - Body ground	Ground	Always	Below 1 Ω

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

(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
L20-2 (DC+) - L20-1 (DC-)	L - G	Back door lock motor circuit	Back door lock motor operating	11 to 14 V
L20-2 (DC+) - L20-1 (DC-)	L - G	Back door lock motor circuit	Back door lock motor not operating	Below 1 V
L20-20 (FUL) - Body ground	GR - Body ground	Back door courtesy switch circuit	Back door closed	11 to 14 V
L20-20 (FUL) - Body ground	GR - Body ground	Back door courtesy switch circuit	Back door open	Below 1 V
L20-22 (HAF) - Body ground	LG - Body ground	Back door lock half-latch switch signal circuit	Back door open → Back door closer operates → Back door closed	Below 1 V → 11 to 14 V → Below 1 V
L20-24 (POS) - Body ground	P - Body ground	Back door lock position switch signal circuit	Back door open → Back door closer operates → Back door closed	Below 1 V → 11 to 14 V → Below 1 V

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

2. BACK DOOR CLOSER ECU (MULTIPLEX NETWORK DOOR ECU) (w/o POWER BACK DOOR SYSTEM)

(a) Disconnect the L21 back door closer 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
L21-4 (B) - Body ground	LG - Body ground	Battery power supply	Always	11 to 14 V
L21-16 (ECUB) - Body ground	P - Body ground	Battery power supply	Always	11 to 14 V
L21-15 (IG) - Body ground	SB - Body ground	IG power supply	Ignition switch ON	11 to 14 V
L21-15 (IG) - Body ground	SB - Body ground	IG power supply	Ignition switch off	Below 1 V
L21-3 (GND) - Body ground	W-B - 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 according to the value(s) in the table below.

Tester Connection	Wiring Color	Terminal Description	Condition	Specified Condition
L21-2 (DC+) - L21-1 (DC-)	L - G	Back door lock motor circuit	Back door lock motor operating	11 to 14 V
L21-2 (DC+) - L21-1 (DC-)	L - G	Back door lock motor circuit	Back door lock motor not operating	Below 1 V
L21-6 (FUL) - Body ground	GR - Body ground	Back door courtesy switch circuit	Back door closed	11 to 14 V
L21-6 (FUL) - Body ground	GR - Body ground	Back door courtesy switch circuit	Back door open	Below 1 V
L21-5 (HAF) - Body ground	LG - Body ground	Back door lock half-latch switch signal circuit	Back door open → Back door closer operates → Back door closed	Below 1 V → 11 to 14 V → Below 1 V
L21-7 (POS) - Body ground	P - Body ground	Back door lock position switch signal circuit	Back door open → Back door closer operates → Back door closed	Below 1 V → 11 to 14 V → Below 1 V

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

3. 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
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
D49-2 (BDSU) - Body ground	GR - Body ground	Back door opener switch signal circuit	Back door opener switch off	Pulse generation
D49-2 (BDSU) - Body ground	GR - Body ground	Back door opener switch signal circuit	Back door opener switch on	Below 1 V

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

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