Toyota Sienna Service Manual: Illumination Circuit

DESCRIPTION

The Multiplex network body ECU controls illumination light as shown in the chart below.

1.  Room light assembly (Interior light, luggage component light) and courtesy light with DOOR position
2.  Map light assembly (Personal light)
3. Transponder key amplifier (Ignition key cylinder light)

WIRING DIAGRAM

INSPECTION PROCEDURE

1 PERFORM ACTIVE TEST BY INTELLIGENT TESTER

1. Connect the intelligent tester to DLC3.
2.  Turn the ignition switch ON and push the intelligent tester main switch ON.
3.  Select the item below in the ACTIVE TEST and then check that the relay operates

DATA LIST / AIR CONDITIONER

2 INSPECT LIGHT CONTROL RELAY

1. Check that there is resistance between the terminals at each switch position as shown in the chart.

Resistance

3 INSPECT INTERIOR DOME LIGHT SWITCH ASSEMBLY

1. Inspect interior dome light relay continuity.

Resistance

4 INSPECT INTERIOR LIGHT

1. Inspect the each of interior light

5 INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

1. Measure voltage between each of the terminals as shown in the chart below

Voltage

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE