Part 2
NETWORKING: CAN COMMUNICATION SYSTEM: U1002: Lost Communication with Gateway Module (Main Body)
U1002 - Lost Communication with Gateway Module (Main Body)
15. CHECK FOR SHORT IN CAN MS BUS WIRE (CAN NO. 7 J/C)
(a) Reconnect the CAN No. 7 junction connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Text in Illustration
NOTICE:
The resistance should only be measured when the ECUs connected to the CAN bus branch wires are disconnected, and the ECUs containing the terminating resistors are connected to the CAN main bus.
NG -- REPLACE CAN NO. 7 JUNCTION CONNECTOR
OK -- REPLACE POWER BACK DOOR UNIT ASSEMBLY (POWER BACK DOOR ECU) Removal
16. CHECK FOR SHORT IN CAN MS BUS WIRE (CAN NO. 6 J/C)
(a) Reconnect the CAN No. 7 junction connector (w/ Power back door system).
(b) Reconnect the CAN No. 8 junction connector (w/o Power back door system).
(c) Disconnect the CAN No. 6 junction connector.
(d) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Text in Illustration
Result:
D -- CHECK FOR SHORT IN CAN MS BUS WIRE (MAIN BODY ECU)
C -- REPAIR OR REPLACE CAN MS BUS MAIN WIRE OR CONNECTOR (CAN NO. 6 J/C - CAN NO. 8 J/C)
B -- REPAIR OR REPLACE CAN MS BUS MAIN WIRE OR CONNECTOR (CAN NO. 6 J/C - CAN NO. 7 J/C)
A -- Continue to next step.
17. CHECK FOR SHORT IN CAN MS BUS WIRE (CAN NO. 6 J/C - OUTER MIRROR CONTROL ECU LH)
(a) Disconnect the outer mirror control ECU LH connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Text in Illustration
NG -- REPAIR OR REPLACE CAN MS BUS BRANCH WIRE OR CONNECTOR (CAN NO. 6 J/C - OUTER MIRROR CONTROL ECU LH)
OK -- Continue to next step.
18. CHECK FOR SHORT IN CAN MS BUS WIRE (CAN NO. 6 J/C - FRONT POWER SEAT SWITCH LH)
HINT
For vehicles without the position memory system, go to the next step.
(a) Disconnect the front power seat switch LH connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Text in Illustration
NG -- REPAIR OR REPLACE CAN MS BUS BRANCH WIRE OR CONNECTOR (CAN NO. 6 J/C - FRONT POWER SEAT SWITCH LH)
OK -- Continue to next step.
19. CHECK FOR SHORT IN CAN MS BUS WIRE (CAN NO. 6 J/C)
(a) Reconnect the CAN No. 6 junction connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Text in Illustration
NOTICE:
The resistance should only be measured when the ECUs connected to the CAN bus branch wires are disconnected, and the ECUs containing the terminating resistors are connected to the CAN main bus.
NG -- REPLACE CAN NO. 6 JUNCTION CONNECTOR
OK -- Continue to next step.
20. CHECK FOR SHORT IN CAN MS BUS WIRE (ECUS)
(a) Connect the probes of an ohmmeter to terminals F36-5 (CANP) and F36-14 (CANN) of the tilt and telescopic ECU.
Text in Illustration
(b) While observing the resistance value shown on the tester, reconnect the each ECU connector until the resistance becomes abnormal (Below 54 Ohms).
(c) Replace the ECU that caused the total resistance to drop below 54 Ohms when it was reconnected.
HINT
If the resistance becomes abnormal when an ECU connector is reconnected, there may be a short in the ECU.
NEXT -- REPLACE CORRESPONDING ECU
21. CHECK FOR SHORT IN CAN MS BUS WIRE (MAIN BODY ECU)
(a) Reconnect the CAN No. 6 junction connector.
(b) Disconnect the main body ECU connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Text in Illustration
NG -- REPAIR OR REPLACE CAN MS BUS MAIN WIRE OR CONNECTOR (CAN NO. 6 J/C - MAIN BODY ECU)
OK -- REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Removal
22. CHECK FOR SHORT IN CAN MS BUS WIRE (TILT AND TELESCOPIC ECU)
(a) Disconnect the tilt and telescopic ECU connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Text in Illustration
HINT
It is only necessary to perform the inspection in the above table for the result (short circuit) that was obtained in the Check CAN MS Bus Wire inspection.
Find the necessary inspection from the Purpose column that matches the result in the Result column from the Check CAN MS Bus Wire inspection.
NG -- CHECK FOR SHORT IN CAN MS BUS WIRE (CAN J/C NO. 8)
OK -- REPLACE MULTIPLEX TILT AND TELESCOPIC ECU
23. CHECK FOR SHORT IN CAN MS BUS WIRE (CAN J/C NO. 8)
(a) Disconnect the CAN No. 8 junction connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Text in Illustration
Result:
D -- CHECK FOR SHORT IN CAN MS BUS WIRE (CAN J/C NO. 6 MAIN WIRE)
C -- CHECK FOR SHORT IN CAN MS BUS WIRE (CAN J/C NO. 7 MAIN WIRE)
B -- REPAIR OR REPLACE CAN MS BUS MAIN WIRE OR CONNECTOR (CAN NO. 8 J/C - TILT AND TELESCOPIC ECU)
A -- Continue to next step.
24. CHECK FOR SHORT IN CAN MS BUS WIRE (CAN J/C NO. 8 BRANCH WIRE)
(a) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Text in Illustration
HINT
It is only necessary to perform the inspection in the above table for the result (short circuit) that was obtained in the Check CAN MS Bus Wire inspection.
Find the necessary inspection from the Purpose column that matches the result in the Result column from the Check CAN MS Bus Wire inspection.
NG -- CHECK FOR CAN MS BUS BRANCH WIRE
OK -- REPLACE CAN NO. 8 JUNCTION CONNECTOR
25. CHECK FOR SHORT IN CAN MS BUS WIRE (CAN J/C NO. 7 MAIN WIRE)
(a) Disconnect the CAN No. 7 junction connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Text in Illustration
HINT
It is only necessary to perform the inspection in the above table for the result (short circuit) that was obtained in the Check CAN MS Bus Wire inspection.
Find the necessary inspection from the Purpose column that matches the result in the Result column from the Check CAN MS Bus Wire inspection.
Result:
C -- CHECK FOR SHORT IN CAN MS BUS WIRE (CAN J/C NO. 6 MAIN WIRE)
B -- REPAIR OR REPLACE CAN MS BUS MAIN WIRE OR CONNECTOR (CAN NO. 7 J/C - CAN NO. 8 J/C)
A -- Continue to next step.
26. CHECK FOR SHORT IN CAN MS BUS WIRE (CAN J/C NO. 7 BRANCH WIRE)
(a) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Text in Illustration
NG -- CHECK FOR CAN MS BUS BRANCH WIRE
OK -- REPLACE CAN NO. 7 JUNCTION CONNECTOR
27. CHECK FOR SHORT IN CAN MS BUS WIRE (CAN J/C NO. 6 MAIN WIRE)
(a) Disconnect the CAN No. 6 junction connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Text in Illustration
HINT
It is only necessary to perform the inspection in the above table for the result (short circuit) that was obtained in the Check CAN MS Bus Wire inspection.
Find the necessary inspection from the Purpose column that matches the result in the Result column from the Check CAN MS Bus Wire inspection.
Result:
D -- CHECK FOR SHORT IN CAN MS BUS WIRE
C -- REPAIR OR REPLACE CAN MS BUS MAIN WIRE OR CONNECTOR (CAN NO. 6 J/C - CAN NO. 8 J/C)
B -- REPAIR OR REPLACE CAN MS BUS MAIN WIRE OR CONNECTOR (CAN NO. 6 J/C - CAN NO. 7 J/C)
A -- Continue to next step.
28. CHECK FOR SHORT IN CAN MS BUS WIRE (CAN J/C NO. 6 BRANCH WIRE)
(a) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Text in Illustration
NG -- CHECK FOR CAN MS BUS BRANCH WIRE
OK -- REPLACE CAN NO. 6 JUNCTION CONNECTOR
29. CHECK FOR SHORT IN CAN MS BUS WIRE
(a) Disconnect the main body ECU connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Text in Illustration
HINT
It is only necessary to perform the inspection in the above table for the result (short circuit) that was obtained in the Check CAN MS Bus Wire inspection.
Find the necessary inspection from the Purpose column that matches the result in the Result column from the Check CAN MS Bus Wire inspection.
NG -- REPAIR OR REPLACE CAN MS BUS MAIN WIRE OR CONNECTOR (CAN NO. 6 J/C - MAIN BODY ECU)
OK -- REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Removal
30. CHECK FOR CAN MS BUS BRANCH WIRE
(a) Reconnect the connector for the bus wire that is shorted to +B or GND to the CAN junction connector (the connector that caused the bus wire resistance to change to 6 kOhms or higher (for +B short) or 200 Ohms or higher (for ground short) when it was disconnected).
(b) Disconnect the ECU or sensor connected to the CAN bus wire that is shorted to +B or GND.
HINT
If the ECU or sensor has multiple connectors, disconnect the connector that includes the CAN bus wires. To determine the ECU or sensor that is connected to the shorted bus wire, refer to the terminals of ECU tables CAN Communication System.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Text in Illustration
HINT
If the resistance becomes abnormal when the connector is disconnected from the ECU, there may be a short in the ECU.
NG -- REPAIR OR REPLACE CAN MS BUS BRANCH WIRE OR CONNECTOR
OK -- REPLACE CORRESPONDING ECU