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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Diagnostic Trouble Code Chart
DIAGNOSTIC TROUBLE CODE CHART CAN Communication System DTC No. Detection Item DTC Output from Link B1003 ECU Malfunction Central gateway ECU (network gateway ECU) U0199 Lost Communication with "Door Control Module A" Main Body U0200 Lost Communication with "D
Essential information
Emergency flashers
The emergency flashers are used to
warn other drivers when the vehicle
has to be stopped in the road due to
a breakdown, etc.
Operating instructions
Press the switch.
All the turn signal lights will flash. To turn
them off, press the switch once again.
■Emergency
