Toyota Yaris: Lighting System / Back Door Courtesy Switch Circuit

1.

READ VALUE USING GTS

Back Door Courtesy Switch Status

Back door courtesy switch signal

CLOSE or OPEN

CLOSE: Back door closed

OPEN: Back door open

-

Back Door Courtesy Switch Status

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

2.

INSPECT BACK DOOR COURTESY LIGHT SWITCH (BACK DOOR LOCK ASSEMBLY)

REPLACE BACK DOOR COURTESY LIGHT SWITCH (BACK DOOR LOCK ASSEMBLY)

3.

CHECK HARNESS AND CONNECTOR (BACK DOOR COURTESY LIGHT SWITCH (BACK DOOR LOCK ASSEMBLY) - POWER DISTRIBUTION BOX ASSEMBLY AND BODY GROUND)

Y7-3(D+) - 4E-2

Always

Below 1 Ω

Y7-3(D+) or 4E-2 - Body ground

Always

10 kΩ or higher

Y7-2(ACT-) - Body ground

Always

Below 1 Ω

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.

INSPECT POWER DISTRIBUTION BOX ASSEMBLY

*a

Component without harness connected

(Power Distribution Box Assembly)

-

-

4E-2 - MB-19 (BCTY)

Always

Below 1 Ω

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

REPLACE POWER DISTRIBUTION BOX ASSEMBLY