Last Modified: 04-05-2023 6.11:8.1.0 Doc ID: RM100000000VJW4
Model Year Start: 2016 Model: Sienna Prod Date Range: [12/2015 -           ]
Title: SEAT: REAR POWER SEAT CONTROL SYSTEM: Power Source Circuit; 2016 - 2020 MY Sienna [12/2015 -        ]

Power Source Circuit

DESCRIPTION

Power is supplied to the fold seat control ECU through the ECU-IG NO. 2 and FOLD SEAT fuses.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuse for circuits related to this system before performing the following inspection procedure.

PROCEDURE

1.

CHECK HARNESS AND CONNECTOR (FOLD CONTROL ECU - BATTERY AND BODY GROUND)

(a) Disconnect the b2 and b3 or a2 and a3 fold seat control ECU connectors.

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

Standard Voltage:

LH Side

Tester Connection

Switch Condition

Specified Condition

b2-3 (IG) - Body ground

Engine switch off

Below 1 V

Engine switch on (IG)

11 to 14 V

b3-4 (+B) - Body ground

Always

11 to 14 V

RH Side

Tester Connection

Switch Condition

Specified Condition

a2-3 (IG) - Body ground

Engine switch off

Below 1 V

Engine switch on (IG)

11 to 14 V

a3-4 (+B) - Body ground

Always

11 to 14 V

Text in Illustration

*a

Front view of wire harness connector

(to Fold Seat Control ECU)

*b

LH Side

*c

RH Side

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

Standard Resistance:

LH Side

Tester Connection

Condition

Specified Condition

b3-8 (GND) - Body ground

Always

Below 1 Ω

RH Side

Tester Connection

Condition

Specified Condition

a3-8 (GND) - Body ground

Always

Below 1 Ω

(d) Reconnect the fold seat control ECU connectors.

OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

(See page 2016 MY Sienna [12/2015 - 08/2016]; SEAT: REAR POWER SEAT CONTROL SYSTEM: PROBLEM SYMPTOMS TABLE 2017 - 2020 MY Sienna [08/2016 -        ]; SEAT: REAR POWER SEAT CONTROL SYSTEM: PROBLEM SYMPTOMS TABLE )
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR