Toyota Venza manuals

Toyota Venza: 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.

(c) Reconnect the L20 power back door ECU connector.

(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.

(c) Reconnect the L21 back door closer ECU connector.

(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.

(c) Reconnect the D49 and 2F connectors.

(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.

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 ...

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DIAGNOSIS SYSTEM 1. DESCRIPTION (a) The power back door ECU (power back door motor unit)*1 or back door closer ECU (multiplex network door ECU)*2 controls the vehicle's back door closer system ...

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