Toyota Yaris: Lighting System / Back Door Courtesy Switch Circuit
DESCRIPTION
The main body ECU (multiplex network body ECU) receives a back door open/closed signal from the back door courtesy light switch (back door lock assembly).
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
Before replacing the main body ECU (multiplex network body ECU), refer to Registration.
Click here
PROCEDURE
| 1. | READ VALUE USING GTS |
(a) Read the Data List according to the display on the GTS.
Body Electrical > Main Body > Data List| Tester Display | Measurement Item | Range | Normal Condition | Diagnostic Note |
|---|---|---|---|---|
| Back Door Courtesy Switch Status | Back door courtesy switch signal | CLOSE or OPEN | CLOSE: Back door closed OPEN: Back door open | - |
| Tester Display |
|---|
| Back Door Courtesy Switch Status |
OK:
Normal conditions listed above are displayed.
| OK |
 | PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE |
|
| 2. | INSPECT BACK DOOR COURTESY LIGHT SWITCH (BACK DOOR LOCK ASSEMBLY) |
Click here
| NG |
 | 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) |
(a) Disconnect the 4E power distribution box assembly connector.
(b) Measure the resistance according to the value (s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| 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 |
| NG |
 | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
| 4. | INSPECT POWER DISTRIBUTION BOX ASSEMBLY |
| *a | Component without harness connected (Power Distribution Box Assembly) | - | - |
(a) Remove the main body ECU (multiplex network body ECU) from the power distribution box assembly.
Click here
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| 4E-2 - MB-19 (BCTY) | Always | Below 1 Ω |
| OK |
 | REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) |
| NG |
 | REPLACE POWER DISTRIBUTION BOX ASSEMBLY |
Front Door Courtesy Switch Circuit
DESCRIPTION The main body ECU (multiplex network body ECU) detects the condition of the front door courtesy light switch assembly. WIRING DIAGRAM
CAUTION / NOTICE / HINT NOTICE: Before replacing the main body ECU (multiplex network body ECU), refer to Registration...
Interior Light Circuit
DESCRIPTION The main body ECU (multiplex network body ECU) controls the operation of the following lights:
Map Light Assembly
Room Light Assembly
WIRING DIAGRAM
CAUTION / NOTICE / HINT NOTICE:
Inspect the fuses for circuits related to this system before performing the following procedure...
Other information:
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Turning the Engine Off
Stop the vehicle completely. Manual transaxle: Shift into neutral and set the parking brake.Automatic transaxle: Shift the selector lever to the P position and set the parking brake.
Press the push button start to turn off the engine. The ignition position is off.