Last Modified: 04-05-2023 6.11:8.1.0 Doc ID: RM100000000VJN7
Model Year Start: 2016 Model: Sienna Prod Date Range: [12/2015 -           ]
Title: LIGHTING (INT): LIGHTING SYSTEM: TERMINALS OF ECU; 2016 - 2020 MY Sienna [12/2015 -        ]

TERMINALS OF ECU

1. CHECK INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY AND MAIN BODY ECU

(a) Disconnect the 2A, 2D, 2F and 2K instrument panel junction block assembly connectors.

(b) Disconnect the D14 main body ECU connector.

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

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

2A-16 - Body ground

Y - Body ground

IG power supply

Ignition switch off

Below 1 V

Ignition switch ON

11 to 14 V

2A-17 - Body ground

L - Body ground

ACC power supply

Ignition switch off

Below 1 V

Ignition switch ACC

11 to 14 V

2D-28 (GND1) - Body ground

W-B - Body ground

Ground

Always

Below 1 Ω

2F-40 (BECU)*1 - Body ground

W - Body ground

Battery power supply

Always

11 to 14 V

2K-1 - Body ground

W - Body ground

Battery power supply

Always

11 to 14 V

D14-3 (GND2) - Body ground

W-B - Body ground

Ground

Always

Below 1 Ω
  • *1: w/o Smart Key System

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

(d) Reconnect the main body ECU connector.

(e) Reconnect the instrument panel junction block assembly connectors.

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

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

2D-27 (FRCL)*1 - Body ground

V - Body ground

Front courtesy light RH drive output

Front door RH closed

11 to 14 V

Front door RH open

Below 1 V

2D-12 (ILE) - Body ground

L - Body ground

Interior lights drive output

Interior lights off

11 to 14 V

Interior lights on (100% brightness of light on state)

Below 1 V

Interior lights on (Illuminate in light adjustment state)

Pulse generation

2H-36 (FRCY) - Body ground

GR - Body ground

Front door courtesy light switch RH input

Front door RH closed

11 to 14 V

Front door RH open

Below 1 V

2H-34 (FLCY) - Body ground

P - Body ground

Front door courtesy light switch LH input

Front door LH closed

11 to 14 V

Front door LH open

Below 1 V

2H-33 (LSWL) - Body ground

LG - Body ground

Rear door unlock detection switch LH input

Rear door LH locked

Pulse generation

Rear door LH unlocked

Below 1 V

D12-1 (FLCL)*1 - Body ground

Y - Body ground

Front door courtesy light LH drive output

Front door LH closed

11 to 14 V

Front door LH open

Below 1 V

D12-2 (DOMR) - Body ground

V - Body ground

Interior light drive output

Interior light off

11 to 14 V

Interior light door switch not pushed

Below 1 V

D12-3 (LCTY) - Body ground

GR - Body ground

Rear door courtesy light switch LH input

Rear door LH open

Below 1 V

Rear door LH closed

11 to 14 V

D12-5 (CSPT)*2 - Body ground

L - Body ground

Transponder key amplifier illumination drive output

Illumination off

11 to 14 V

Illumination on

Below 1 V

D13-6 (RCTY) - Body ground

L - Body ground

Rear door courtesy light switch RH input

Rear door RH open

Below 1 V

Rear door RH closed

11 to 14 V

D13-7 (LSFL) - Body ground

V - Body ground

Front door unlock detection switch LH input

Front door LH locked

Pulse generation

Front door LH unlocked

Below 1 V

D13-18 (LSFR) - Body ground

Y - Body ground

Front door unlock detection RH switch input

Front door RH locked

Pulse generation

Front door RH unlocked

Below 1 V

D13-19 (BCTY) - Body ground

GR - Body ground

Back door courtesy light switch input

Back door open

Below 1 V

Back door closed

11 to 14 V

D14-2 (LSWR) - Body ground

L - Body ground

Rear door unlock detection switch RH input

Rear door RH locked

Pulse generation

Rear door RH unlocked

Below 1 V
  • *1: w/ Courtesy Light
  • *2: w/o Smart Key System

If the result is not as specified, the main body ECU or instrument panel junction block assembly may have a malfunction.

2. CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) (w/ Smart Key System)

(a) Disconnect the D88 certification ECU (smart key ECU assembly) connector.

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

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

D88-1 (+B) - Body ground

G - Body ground

+B power supply

Always

11 to 14 V

D88-15 (E) - 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 certification ECU (smart key ECU assembly) connector.

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

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

D88-11 (SWIL) - Body ground

SB - Body ground

Engine switch illumination drive output

Engine switch illumination on

11 to 14 V or pulse generation

Engine switch illumination off

Below 1 V

If the result is not as specified, the certification ECU (smart key ECU assembly) may have a malfunction.