B1287 Multiplex back door ECU Communication stops
Diagnostic trouble codes
DESCRIPTION
- This DTC is detected when communication between the multiplex back door ECU and multiplex network gateway ECU stops for more than 10 seconds.
| DTC No. |
DTC Detection Condition |
Trouble Area |
| B1287 |
Multiplex back door ECU Communication stops |
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WIRING DIAGRAM
INSPECTION PROCEDURE
When "+B of GND short malfunction of communication bus" DTCs (B1214 and B1215) are detected at the same time as "communication stop" DTC B1287, repair the "+B or GND short malfunction of communication bus" DTCs first.| 1. CHECK OPERATION |
Check if the back door closer function operates normally through the power back door closer switch.
- HINT:
- With this inspection, the multiplex back door ECU CPU can be diagnosed if it works normally or not.
- OK:
- Power back door closer function operates normally.
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| NG | |
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| 2. INSPECT FUSE (PBO) |
Remove the PBO fuse from the instrument panel junction block.
Measure the resistance of the fuse.
- Standard resistance:
- Below 1 Ω
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| OK | |
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| 3. CHECK WIRE HARNESS (MULTIPLEX BACK DOOR ECU - BATTERY AND BODY GROUND) |
Disconnect the P11 ECU connector.
Measure the voltage of the wire harness side connector.
- Standard voltage:
Tester Connection
Specified Condition
P11-2 (B) - Body ground
10 to 14 V
Measure the resistance of the wire harness side connector.
- Standard resistance:
Tester Connection
Specified Condition
P11-8 (GND) - Body ground
Below 1 Ω
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| OK | |
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| 4. CHECK RESISTANCE OF COMMUNICATION LINE |
Disconnect the P10, P19 and T4 ECU connectors (w/ Driving position memory).
Disconnect the P10, P19 and G1 ECU connectors (w/o Driving position memory).
Measure the resistance of the wire harness side connectors.
- Standard resistance:
Tester Connection
Specified Condition
P10-22 (MPX1) - P19-7 (MPX1)
Below 1 Ω
P10-22 (MPX1) - T4-5 (MPX1) (*1)
Below 1 Ω
P10-22 (MPX1) - G1-12 (MPD2) (*2)
Below 1 Ω
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| OK | ||
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