Toyota Sienna Service Manual: Indicator Circuit

Toyota Sienna Service Manual / Seat / Rear no. 2 Seat assembly (w/ Power Stowing Function) / On-vehicle inspection / Indicator Circuit

DESCRIPTION

This system has two indicator lights. One of the indicator lights is built into the fold seat switch. This indicator light receives power from the fold seat control ECU. It comes on or blinks when the system detects that an object is caught or when the seat operation conditions are not met.

The other indicator light is on the combination meter. This indicator light comes on when the reclining motor or fold seat control ECU is not initialized, any seat legs are released, or when the seatback is outside the reclining operation range.

WIRING DIAGRAM

WIRING DIAGRAM

INSPECTION PROCEDURE

HINT:

When the indicator light on the fold seat switch does not come on, start troubleshooting from step 1.
When the indicator light on the combination meter does not come on, start troubleshooting from step 6.

1 INSPECT FOLD SEAT SWITCH

INSPECT FOLD SEAT SWITCH

Remove the fold seat switch.
Disconnect the connector from the fold seat switch.
Connect the positive (+) lead from the battery terminal 3 and negative (-) lead to terminal 5, and check that the indicator light comes on.

OK: Indicator light comes on.

2 CHECK HARNESS AND CONNECTOR (FOLD SEAT CONTROL ECU - FOLD SEAT SWITCH)

CHECK HARNESS AND CONNECTOR

Disconnect the connector from the fold seat control ECU.
Measure the resistance according to the value(s) in the table below.

Standard resistance LH side

Standard resistance

RH side

Standard resistance

3 CHECK HARNESS AND CONNECTOR (FOLD SEAT SWITCH - BACK DOOR COURTESY SWITCH)

CHECK HARNESS AND CONNECTOR

Disconnect the connector from the back door courtesy switch.
Measure the resistance according to the value(s) in the table below.

Standard resistance LH side

Standard resistance

RH side

Standard resistance

4 INSPECT BACK DOOR COURTESY SWITCH

INSPECT BACK DOOR COURTESY SWITCH

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

Standard resistance

Standard resistance

5 CHECK HARNESS AND CONNECTOR (BACK DOOR COURTESY SWITCH - BODY GROUND)

CHECK HARNESS AND CONNECTOR

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

Standard resistance

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

6 CHECK HARNESS AND CONNECTOR (COMBINATION METER - BATTERY)

CHECK HARNESS AND CONNECTOR

Remove the combination meter.
Disconnect the connector from the combination meter.
Measure the voltage according to the value(s) in the table below.

Standard voltage

Standard voltage

7 CHECK HARNESS AND CONNECTOR (COMBINATION METER - FOLD SEAT CONTROL ECU)

CHECK HARNESS AND CONNECTOR

Disconnect the connector from the fold seat control ECU.
Measure the resistance according to the value(s) in the table below.

Standard resistance LH side

Standard resistance

RH side

Standard resistance

8 INSPECT COMBINATION METER (3rd SEAT INDICATOR LIGHT)

INSPECT COMBINATION METER (3rd SEAT INDICATOR LIGHT)

Connect the positive (+) lead from the battery terminal 32 and negative (-) lead to terminal 3, and check that the indicator light comes on.

OK: Indicator light comes on.

7 CHECK HARNESS AND CONNECTOR (COMBINATION METER - FOLD SEAT CONTROL ECU)

CHECK HARNESS AND CONNECTOR

Disconnect the connector from the fold seat control ECU.
Measure the resistance according to the value(s) in the table below.

Standard resistance LH side

Standard resistance

RH side

Standard resistance

8 INSPECT COMBINATION METER (3rd SEAT INDICATOR LIGHT)

INSPECT COMBINATION METER (3rd SEAT INDICATOR LIGHT)

Connect the positive (+) lead from the battery terminal 32 and negative (-) lead to terminal 3, and check that the indicator light comes on.

OK: Indicator light comes on.

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

Back Door Courtesy Switch Circuit

DESCRIPTION The fold seat control ECU receives signals from the back door courtesy switch and detects the state of the back door (open/close). If the ECU does not detect that the back door is open ...

Power Source Circuit

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