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B1215








MULTIPLEX COMMUNICATION: MULTIPLEX COMMUNICATION SYSTEM: B1214: Short to B+ in Door System Communication Bus Malfunction

DTC B1214 - Short to B+ in Door System Communication Bus Malfunction

DTC B1215 - Short to GND in Door System Communication Bus Malfunction

DESCRIPTION

The air conditioning (A/C) ECU, body ECU (built into driver side junction block), combination meter, certification ECU*, power source control ECU, tire pressure monitor ECU, transmission control ECU, transponder key ECU and gateway ECU are connected to the Body Electronics Area Network (BEAN). The gateway ECU monitors the BEAN. If there is a B+ or GND short in the BEAN, the gateway ECU sets the DTC and the related system(s) do not operate.





HINT: *: Equipped on smart key vehicles.

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK A/C ECU




(a) Turn the power switch OFF.
(b) Disconnect the A/C ECU connector.
(c) Connect the Techstream to the DLC3.
(d) Turn the power switch ON (IG).
(e) Clear and check DTCs.
Result:






B -- REPLACE A/C ECU
A -- Continue to next step.

2. CHECK TRANSMISSION CONTROL ECU




(a) Turn the power switch OFF.
(b) Connect the A/C ECU connector.
(c) Disconnect the transmission control ECU connector.
(d) Turn the power switch ON (IG).
(e) Clear and check DTCs.
Result:






B -- REPLACE TRANSMISSION CONTROL ECU
A -- Continue to next step.

3. CHECK WIRE HARNESS (TRANSMISSION CONTROL ECU - A/C ECU)




(a) Turn the power switch OFF.
(b) Disconnect the transmission control ECU connector and A/C ECU connector.
(c) Turn the power switch ON (IG).
(d) Clear and check DTCs.
Result:






B -- CHECK DRIVER SIDE JUNCTION BLOCK
A -- Continue to next step.

4. CHECK POWER SOURCE CONTROL ECU




(a) Turn the power switch OFF.
(b) Connect the A/C ECU connector and transmission control ECU connector.
(c) Disconnect the power source control ECU connector.
(d) Turn the power switch ON (IG).
(e) Clear and check DTCs.
Result:






B -- REPLACE POWER SOURCE CONTROL ECU
A -- Continue to next step.

5. CHECK WIRE HARNESS (POWER SOURCE CONTROL ECU - TRANSMISSION CONTROL ECU)




(a) Turn the power switch OFF.
(b) Disconnect the power source control ECU connector and transmission control ECU connector.
(c) Turn the power switch ON (IG).
(d) Clear and check DTCs.
Result:






B -- CHECK COMBINATION METER
A -- Continue to next step.

6. CHECK WIRE HARNESS (GATEWAY ECU - POWER SOURCE CONTROL ECU)




(a) Turn the power switch OFF.
(b) Connect the transmission control ECU connector.
(c) Disconnect the power source control ECU connector and gateway ECU connector.
(d) Measure the resistance and voltage of the gateway ECU connector terminal.
Standard resistance:






Standard voltage






NG -- REPAIR OR REPLACE HARNESS AND CONNECTOR
OK -- Continue to next step.

7. CHECK WIRE HARNESS (GATEWAY ECU - A/C ECU)




(a) Turn the power switch OFF.
(b) Connect the power source control ECU connector.
(c) Disconnect the A/C ECU connector and gateway ECU connector.
(d) Measure the resistance and voltage of the gateway ECU connector terminal.
Standard resistance:






Standard voltage






NG -- REPAIR OR REPLACE HARNESS AND CONNECTOR
OK -- REPLACE GATEWAY ECU
8. CHECK DRIVER SIDE JUNCTION BLOCK




(a) Turn the power switch OFF.
(b) Connect the A/C ECU connector and transmission control ECU connector.
(c) Disconnect the 1G driver side junction block connector and B5 main body ECU connector.
(d) Turn the power switch ON (IG).
(e) Clear and check DTCs.
Result:






B -- REPLACE DRIVER SIDE JUNCTION BLOCK
A -- Continue to next step.

9. CHECK WIRE HARNESS (DRIVER SIDE JUNCTION BLOCK - A/C ECU)




(a) Turn the power switch OFF.
(b) Connect the B5 ECU connector.
(c) Disconnect the 1G driver side junction block connector and A/C ECU connector.
(d) Turn the power switch ON (IG).
(e) Clear and check DTCs.
Result:






B -- REPAIR OR REPLACE HARNESS AND CONNECTOR
A -- Continue to next step.

10. CHECK TRANSPONDER KEY ECU




(a) Turn the power switch OFF.
(b) Connect the driver side junction block connector and A/C ECU connector.
(c) Disconnect the transponder key ECU connector.
(d) Turn the power switch ON (IG).
(e) Clear and check DTCs.
Result:






B -- REPLACE TRANSPONDER KEY ECU
A -- Continue to next step.

11. CHECK WIRE HARNESS (TRANSPONDER KEY ECU - DRIVER SIDE JUNCTION BLOCK)




(a) Turn the power switch OFF.
(b) Disconnect the transponder key ECU connector and B5 ECU connector.
(c) Turn the power switch ON (IG).
(d) Clear and check DTCs.
Result:






B -- REPAIR OR REPLACE HARNESS AND CONNECTOR (TRANSPONDER KEY ECU - DRIVER SIDE JUNCTION BLOCK)
A -- REPAIR OR REPLACE HARNESS AND CONNECTOR (TRANSPONDER KEY ECU - TRANSMISSION CONTROL ECU)
12. CHECK COMBINATION METER




(a) Turn the power switch OFF.
(b) Connect the power source control ECU connector and transmission control ECU connector.
(c) Disconnect the C10 meter connector.
(d) Turn the ignition switch ON (IG).
(e) Clear and check DTCs.
Result:






B -- REPLACE COMBINATION METER
A -- Continue to next step.

13. CHECK WIRE HARNESS (COMBINATION METER - POWER SOURCE CONTROL ECU)




(a) Turn the power switch OFF.
(b) Disconnect the C10 combination meter and power source control ECU connector.
(c) Turn the power switch ON (IG).
(d) Clear and check DTCs.
Result:






B -- REPAIR OR REPLACE HARNESS AND CONNECTOR
A -- Continue to next step.

14. CHECK TIRE PRESSURE WARNING ECU




(a) Turn the power switch OFF.
(b) Connect the C10 meter connector and power source control ECU connector.
(c) Disconnect the tire pressure monitor ECU connector.
(d) Turn the power switch ON (IG).
(e) Clear and check DTCs.
Result:






B -- REPLACE TIRE PRESSURE WARNING ECU
A -- Continue to next step.

15. CHECK WIRE HARNESS (TIRE PRESSURE WARNING ECU - COMBINATION METER)




(a) Turn the power switch OFF.
(b) Disconnect the tire pressure monitor ECU connector and C10 meter connector.
(c) Turn the power switch ON (IG).
(d) Clear and check DTCs.
Result:






B -- REPAIR OR REPLACE HARNESS AND CONNECTOR
A -- Continue to next step.

16. CONFIRM EQUIPMENT

Equipment





B -- REPAIR OR REPLACE HARNESS AND CONNECTOR (TIRE PRESSURE MONITOR ECU - TRANSMISSION CONTROL ECU)
A -- Continue to next step.

17. CHECK CERTIFICATION ECU




(a) Turn the power switch OFF.
(b) Connect the C10 meter connector and tire pressure monitor ECU connector.
(c) Disconnect the certification ECU connector.
(d) Turn the power switch ON (IG).
(e) Clear and check DTCs.
Result:






B -- REPLACE CERTIFICATION ECU
A -- Continue to next step.

18. CHECK WIRE HARNESS (CERTIFICATION ECU - TIRE PRESSURE MONITOR ECU)




(a) Turn the power switch OFF.
(b) Disconnect the certification ECU connector and tire pressure monitor ECU connector.
(c) Turn the power switch ON (IG).
(d) Clear and check DTCs.
Result:






B -- REPAIR OR REPLACE HARNESS AND CONNECTOR (CERTIFICATION ECU - TIRE PRESSURE MONITOR ECU)
A -- REPAIR OR REPLACE HARNESS AND CONNECTOR (CERTIFICATION ECU - TRANSMISSION CONTROL ECU)
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