Lexus NX: Back Door Courtesy Switch Circuit
DESCRIPTION
The fold seat control ECU receives the switch operation signal, driving condition signal and back door open/close signal from the back door lock assembly. The fold seat control ECU actives the rear seat according to these signals.
WIRING DIAGRAM
PROCEDURE
| 1. | CHECK BACK DOOR LOCK ASSEMBLY (BACK DOOR COURTESY LIGHT SWITCH) |
(a) Check that the luggage compartment light is on and off according to the back door operation.
OK:
Luggage compartment light is on and off normally according to the back door operation.
| NG | .gif) | GO TO LIGHTING SYSTEM |
|
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| 2. | CHECK HARNESS AND CONNECTOR (BACK DOOR LOCK ASSEMBLY - FOLD SEAT CONTROL ECU AND BODY GROUND) |
(a) Disconnect the Y12*1 or Y13*2 back door lock assembly connector.
- *1: w/ Power Back Door System
- *2: w/o Power Back Door System
(b) Disconnect the h3*1 or i3*2 fold seat control ECU connector.
- *1: Rear Right Seat
- *2: Rear Left Seat
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
w/ Power Back Door System (Rear Right Seat)
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| Y12-8 (CTY) - h3-19 (BDCY) | Always | Below 1 Ω |
| Y12-7 (E) - Body ground | Always | Below 1 Ω |
| Y12-8 (CTY) or h3-19 (BDCY) - Body ground | Always | 10 kΩ or higher |
w/o Power Back Door System (Rear Right Seat)
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| Y13-3 (D+) - h3-19 (BDCY) | Always | Below 1 Ω |
| Y13-2 (ACT-) - Body ground | Always | Below 1 Ω |
| Y13-3 (D+) or h3-19 (BDCY) - Body ground | Always | 10 kΩ or higher |
w/ Power Back Door System (Rear Left Seat)
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| Y12-8 (CTY) - i3-19 (BDCY) | Always | Below 1 Ω |
| Y12-7 (E) - Body ground | Always | Below 1 Ω |
| Y12-8 (CTY) or i3-19 (BDCY) - Body ground | Always | 10 kΩ or higher |
w/o Power Back Door System (Rear Left Seat)
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| Y13-3 (D+) - i3-19 (BDCY) | Always | Below 1 Ω |
| Y13-2 (ACT-) - Body ground | Always | Below 1 Ω |
| Y13-3 (D+) or i3-19 (BDCY) - Body ground | Always | 10 kΩ or higher |
| OK | | PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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