- MS bus circuit
- Power seat control ECU branch wire or connector
- Multiplex tilt and telescopic ECU branch wire or connector
- Outer mirror control ECU branch wire or connector
- Power back door ECU branch wire or connector*1
- Combination meter ECU main wire or connector
- Main body ECU main wire or connector
- Power seat control ECU
- Multiplex tilt and telescopic ECU
- Outer mirror control ECU
- Combination meter ECU
- Main body ECU
- Power back door ECU*1
- No. 3 junction connector
- No. 4 junction connector*1
| Last Modified: 11-29-2007 | 1.6 C | |
| Service Category: Power Source/Network | Section: Networking | |
| Model Year: 2008 | Model: Sequoia | Doc ID: RM000002VTM002X |
| Title: NETWORKING: CAN COMMUNICATION SYSTEM: DESCRIPTION (2008 Sequoia) | ||
|
DTC |
U1002 |
Lost Communication with Gateway Module |
DESCRIPTION
If 2 or more DTCs are output during the DTC check, one side of the CAN branch wire may be open. (One side of the CANH [branch wire]/CANL [branch wire] of the ECU and/or sensor is open.)
|
DTC Code |
DTC Detection Condition |
Trouble Area |
|---|---|---|
|
U1002 |
Main body ECU cannot receive signals from all ECUs that have been memorized as those connected to the CAN MS bus. |
|
HINT:
*1: w/ Power back door
WIRING DIAGRAM
INSPECTION PROCEDURE
PROCEDURE
|
1. |
DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL |
(a) Disconnect the cable from the negative (-) battery terminal before measuring the resistances of the main wire and the branch wire.
CAUTION:
Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.
|
|
2. |
CHECK CAN BUS WIRE (MAIN WIRE FOR DISCONNECTION, BUS LINES FOR SHORT CIRCUIT) |
|
(a) Measure the resistance according to the value(s) in the table below. Standard Resistance:
|
|
|
3. |
CHECK FOR OPEN IN CAN BUS WIRE (NO. 3 JUNCTION CONNECTOR - MAIN BODY ECU) |
|
(a) with Power back door system: (1) Disconnect the H104 No. 3 junction connector. (2) Measure the resistance according to the value(s) in the table below. Standard Resistance:
|
|
|
(b) without Power back door system: (1) Disconnect the H104 No. 3 junction connector. (2) Measure the resistance according to the value(s) in the table below. Standard Resistance:
|
|
|
4. |
CONNECT CONNECTOR |
(a) Reconnect the H104 No. 3 junction connector.
|
|
5. |
CHECK FOR OPEN IN CAN BUS WIRE (NO. 3 JUNCTION CONNECTOR - COMBINATION METER ECU) |
|
(a) Disconnect the H102 No. 3 junction connector. |
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Switch Condition |
Specified Condition |
|---|---|---|
|
H102-1 (CANH) - H102-2 (CANL) |
Ignition switch off |
108 to 132 Ω |
|
|
6. |
CONNECT CONNECTOR |
(a) Reconnect the H102 No. 3 junction connector.
|
|
7. |
CHECK FOR OPEN IN CAN BUS WIRE (COMBINATION METER ECU - NO. 3 JUNCTION CONNECTOR) |
|
(a) Disconnect the H102 No. 3 junction connector. |
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Switch Condition |
Specified Condition |
|---|---|---|
|
H37-22 (CANH) - H37-21 (CANL) |
Ignition switch off |
108 to 132 Ω |
|
|
8. |
CONNECT CONNECTOR |
(a) Reconnect the H104 No. 3 junction connector.
|
|
9. |
CHECK FOR OPEN IN CAN BUS WIRE (MAIN BODY ECU - NO. 3 JUNCTION CONNECTOR) |
|
(a) Disconnect the H2 main body ECU connector. |
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Switch Condition |
Specified Condition |
|---|---|---|
|
H2-16 (CANP) - H2-15 (CANN) |
Ignition switch off |
108 to 132 Ω |
|
|
10. |
CONNECT CONNECTOR |
(a) Reconnect the H104 No. 3 junction connector.
|
|
11. |
CHECK FOR OPEN IN CAN BUS WIRE (NO. 3 JUNCTION CONNECTOR - NO. 4 JUNCTION CONNECTOR) |
|
(a) Disconnect the O41 No. 4 junction connector. |
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Switch Condition |
Specified Condition |
|---|---|---|
|
O41-6 (CANH) - O41-12 (CANL) |
Ignition switch off |
108 to 132 Ω |
|
|
12. |
CHECK FOR OPEN IN CAN BUS WIRE (NO. 4 JUNCTION CONNECTOR - MAIN BODY ECU) |
|
(a) Measure the resistance according to the value(s) in the table below. Standard Resistance:
|
|
|
13. |
CONNECT CONNECTOR |
(a) Reconnect the O41 No. 4 junction connector.
|
|
14. |
CHECK FOR OPEN IN CAN BUS WIRE (MAIN BODY ECU - NO. 4 JUNCTION CONNECTOR) |
|
|
(a) Disconnect the H2 main body ECU connector. |
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Switch Condition |
Specified Condition |
|---|---|---|
|
H2-16 (CANP) - H2-15 (CANN) |
Ignition switch off |
108 to 132 Ω |
|
|
15. |
CHECK FOR SHORT IN CAN BUS WIRES (NO. 3 JUNCTION CONNECTOR SIDE) |
|
(a) Disconnect the H104 No. 3 junction connector. |
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Switch Condition |
Specified Condition |
|---|---|---|
|
H37-22 (CANH) - H37-21 (CANL) |
Ignition switch off |
108 to 132 Ω |
|
H37-22 (CANH) - H19-4 (CG) |
Ignition switch off |
200 Ω or higher |
|
H37-21 (CANL) - H19-4 (CG) |
Ignition switch off |
200 Ω or higher |
|
H37-22 (CANH) - H19-16 (BAT) |
Ignition switch off |
6 kΩ or higher |
|
H37-21 (CANL) - H19-16 (BAT) |
Ignition switch off |
6 kΩ or higher |
|
|
16. |
CONNECT CONNECTOR |
(a) Reconnect the H104 No. 3 junction connector.
|
|
17. |
CHECK FOR SHORT IN CAN BUS WIRES (NO. 3 JUNCTION CONNECTOR - NO. 4 JUNCTION CONNECTOR) |
|
(a) Disconnect the O41 No. 4 junction connector. |
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Switch Condition |
Specified Condition |
|---|---|---|
|
O41-6 (CANH) - O41-12 (CANL) |
Ignition switch off |
108 to 132 Ω |
|
O41-6 (CANH) - H19-4 (CG) |
Ignition switch off |
200 Ω or higher |
|
O41-12 (CANL) - H19-4 (CG) |
Ignition switch off |
200 Ω or higher |
|
O41-6 (CANH) - H19-16 (BAT) |
Ignition switch off |
6 kΩ or higher |
|
O41-12 (CANL) - H19-16 (BAT) |
Ignition switch off |
6 kΩ or higher |
|
|
18. |
CONNECT CONNECTOR |
(a) Reconnect the O41 No. 4 junction connector.
|
|
19. |
CHECK FOR SHORT IN CAN BUS WIRES (NO. 4 JUNCTION CONNECTOR - POWER BACK DOOR ECU) |
|
(a) Disconnect the O42 No. 4 junction connector. |
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Switch Condition |
Specified Condition |
|---|---|---|
|
O42-1 (CANH) - O42-7 (CANL) |
Ignition switch off |
1 Ω or higher |
|
O42-1 (CANH) - H19-4 (CG) |
Ignition switch off |
200 Ω or higher |
|
O42-7 (CANL) - H19-4 (CG) |
Ignition switch off |
200 Ω or higher |
|
O42-1 (CANH) - H19-16 (BAT) |
Ignition switch off |
6 kΩ or higher |
|
O42-7 (CANL) - H19-16 (BAT) |
Ignition switch off |
6 kΩ or higher |
|
|
20. |
CHECK FOR SHORT IN CAN BUS WIRES (NO. 4 JUNCTION CONNECTOR - MAIN BODY ECU) |
|
(a) Disconnect the O41 No. 4 junction connector. |
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Switch Condition |
Specified Condition |
|---|---|---|
|
O41-5 (CANH) - O41-12 (CANL) |
Ignition switch off |
108 to 132 Ω |
|
O41-5 (CANH) - H19-4 (CG) |
Ignition switch off |
200 Ω or higher |
|
O41-11 (CANL) - H19-4 (CG) |
Ignition switch off |
200 Ω or higher |
|
O41-5 (CANH) - H19-16 (BAT) |
Ignition switch off |
6 kΩ or higher |
|
O41-11 (CANL) - H19-16 (BAT) |
Ignition switch off |
6 kΩ or higher |
|
|
21. |
CONNECT CONNECTOR |
(a) Reconnect the O42 No. 4 junction connector.
|
|
22. |
CHECK FOR SHORT IN CAN BUS WIRES (POWER BACK DOOR ECU) |
|
(a) Disconnect the O30 power back door ECU connector. |
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Switch Condition |
Specified Condition |
|---|---|---|
|
O30-6 (CANP) - O30-5 (CANN) |
Ignition switch off |
54 to 69 Ω |
|
O30-6 (CANP) - H19-4 (CG) |
Ignition switch off |
200 Ω or higher |
|
O30-5 (CANN) - H19-4 (CG) |
Ignition switch off |
200 Ω or higher |
|
O30-6 (CANP) - H19-16 (BAT) |
Ignition switch off |
6 kΩ or higher |
|
O30-5 (CANN) - H19-16 (BAT) |
Ignition switch off |
6 kΩ or higher |
|
|
23. |
CONNECT CONNECTOR |
(a) Reconnect the O42 No. 4 junction connector.
|
|
24. |
CHECK FOR SHORT IN CAN BUS WIRES (MAIN BODY ECU) |
|
(a) Disconnect the H2 main body ECU connector. |
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Switch Condition |
Specified Condition |
|---|---|---|
|
H2-16 (CANP) - H2-15 (CANN) |
Ignition switch off |
108 to 132 Ω |
|
H2-16 (CANP) - H19-4 (CG) |
Ignition switch off |
200 Ω or higher |
|
H2-15 (CANN) - H19-4 (CG) |
Ignition switch off |
200 Ω or higher |
|
H2-16 (CANP) - H19-16 (BAT) |
Ignition switch off |
6 kΩ or higher |
|
H2-15 (CANN) - H19-16 (BAT) |
Ignition switch off |
6 kΩ or higher |
|
|
25. |
CONNECT CONNECTOR |
(a) Reconnect the H104 No. 3 junction connector.
|
|
26. |
CHECK FOR SHORT IN CAN BUS WIRES (NO. 3 JUNCTION CONNECTOR - POWER SEAT CONTROL ECU) |
|
(a) Disconnect the H97 No. 3 junction connector. |
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Switch Condition |
Specified Condition |
|---|---|---|
|
H97-1 (CANH) - H97-2 (CANL) |
Ignition switch off |
1 Ω or higher |
|
H97-1 (CANH) - H19-4 (CG) |
Ignition switch off |
200 Ω or higher |
|
H97-2 (CANL) - H19-4 (CG) |
Ignition switch off |
200 Ω or higher |
|
H97-1 (CANH) - H19-16 (BAT) |
Ignition switch off |
6 kΩ or higher |
|
H97-2 (CANL) - H19-16 (BAT) |
Ignition switch off |
6 kΩ or higher |
|
|
27. |
CONNECT CONNECTOR |
(a) Reconnect the H97 No. 3 junction connector.
|
|
28. |
CHECK FOR SHORT IN CAN BUS WIRES (NO. 3 JUNCTION CONNECTOR - MULTIPLEX TILT AND TELESCOPIC ECU) |
|
(a) Disconnect the H96 No. 3 junction connector. |
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Switch Condition |
Specified Condition |
|---|---|---|
|
H96-1 (CANH) - H96-2 (CANL) |
Ignition switch off |
1 Ω or higher |
|
H96-1 (CANH) - H19-4 (CG) |
Ignition switch off |
200 Ω or higher |
|
H96-2 (CANL) - H19-4 (CG) |
Ignition switch off |
200 Ω or higher |
|
H96-1 (CANH) - H19-16 (BAT) |
Ignition switch off |
6 kΩ or higher |
|
H96-2 (CANL) - H19-16 (BAT) |
Ignition switch off |
6 kΩ or higher |
|
|
29. |
CONNECT CONNECTOR |
(a) Reconnect the H96 No. 3 junction connector.
|
|
30. |
CHECK FOR SHORT IN CAN BUS WIRES (NO. 3 JUNCTION CONNECTOR - OUTER MIRROR CONTROL ECU) |
|
(a) Disconnect the H98 No. 3 junction connector. |
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Switch Condition |
Specified Condition |
|---|---|---|
|
H98-1 (CANH) - H98-2 (CANL) |
Ignition switch off |
1 Ω or higher |
|
H98-1 (CANH) - H19-4 (CG) |
Ignition switch off |
200 Ω or higher |
|
H98-2 (CANL) - H19-4 (CG) |
Ignition switch off |
200 Ω or higher |
|
H98-1 (CANH) - H19-16 (BAT) |
Ignition switch off |
6 kΩ or higher |
|
H98-2 (CANL) - H19-16 (BAT) |
Ignition switch off |
6 kΩ or higher |
|
|
31. |
CONNECT CONNECTOR |
(a) Reconnect the H98 No. 3 junction connector.
|
|
32. |
CHECK FOR SHORT IN CAN BUS WIRES (NO. 3 JUNCTION CONNECTOR - COMBINATION METER ECU) |
|
(a) Disconnect the H102 No. 3 junction connector. |
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Switch Condition |
Specified Condition |
|---|---|---|
|
H102-1 (CANH) - H102-2 (CANL) |
Ignition switch off |
108 to 132 Ω |
|
H102-1 (CANH) - H19-4 (CG) |
Ignition switch off |
200 Ω or higher |
|
H102-2 (CANL) - H19-4 (CG) |
Ignition switch off |
200 Ω or higher |
|
H102-1 (CANH) - H19-16 (BAT) |
Ignition switch off |
6 kΩ or higher |
|
H102-2 (CANL) - H19-16 (BAT) |
Ignition switch off |
6 kΩ or higher |
Result
|
Result |
Proceed to |
|---|---|
|
OK (w/o Power back door system) |
A |
|
NG |
B |
|
OK (w/ Power back door system) |
C |
|
|
33. |
CONNECT CONNECTOR |
(a) Reconnect the H102 No. 3 junction connector.
|
|
34. |
CHECK FOR SHORT IN CAN BUS WIRES (NO. 3 JUNCTION CONNECTOR - MAIN BODY ECU) |
|
(a) Disconnect the H104 No. 3 junction connector. |
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Switch Condition |
Specified Condition |
|---|---|---|
|
H104-1 (CANH) - H104-2 (CANL) |
Ignition switch off |
108 to 132 Ω |
|
H104-1 (CANH) - H19-4 (CG) |
Ignition switch off |
200 Ω or higher |
|
H104-2 (CANL) - H19-4 (CG) |
Ignition switch off |
200 Ω or higher |
|
H104-1 (CANH) - H19-16 (BAT) |
Ignition switch off |
6 kΩ or higher |
|
H104-2 (CANL) - H19-16 (BAT) |
Ignition switch off |
6 kΩ or higher |
|
|
35. |
CONNECT CONNECTOR |
(a) Reconnect the H97 No. 3 junction connector.
|
|
36. |
CHECK FOR SHORT IN CAN BUS WIRES (POWER SEAT CONTROL ECU) |
|
(a) Disconnect the X11 power seat control ECU connector. |
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Switch Condition |
Specified Condition |
|---|---|---|
|
X11-5 (CANH) - X11-1 (CANL) |
Ignition switch off |
54 to 69 Ω |
|
X11-5 (CANH) - H19-4 (CG) |
Ignition switch off |
200 Ω or higher |
|
X11-1 (CANL) - H19-4 (CG) |
Ignition switch off |
200 Ω or higher |
|
X11-5 (CANH) - H19-16 (BAT) |
Ignition switch off |
6 kΩ or higher |
|
X11-1 (CANL) - H19-16 (BAT) |
Ignition switch off |
6 kΩ or higher |
|
|
37. |
CONNECT CONNECTOR |
(a) Reconnect the H96 No. 3 junction connector.
|
|
38. |
CHECK FOR SHORT IN CAN BUS WIRES (MULTIPLEX TILT AND TELESCOPIC ECU) |
|
(a) Disconnect the H57 multiplex tilt and telescopic ECU connector. |
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Switch Condition |
Specified Condition |
|---|---|---|
|
H57-5 (CANH) - H57-14 (CANL) |
Ignition switch off |
54 to 69 Ω |
|
H57-5 (CANH) - H19-4 (CG) |
Ignition switch off |
200 Ω or higher |
|
H57-14 (CANL) - H19-4 (CG) |
Ignition switch off |
200 Ω or higher |
|
H57-5 (CANH) - H19-16 (BAT) |
Ignition switch off |
6 kΩ or higher |
|
H57-14 (CANL) - H19-16 (BAT) |
Ignition switch off |
6 kΩ or higher |
|
|
39. |
CONNECT CONNECTOR |
(a) Reconnect the H98 No. 3 junction connector.
|
|
40. |
CHECK FOR SHORT IN CAN BUS WIRES (OUTER MIRROR CONTROL ECU) |
|
(a) Disconnect the M8 outer mirror control ECU connector. |
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Switch Condition |
Specified Condition |
|---|---|---|
|
M8-1 (CAN) - M8- 21 (CGND) |
Ignition switch off |
54 to 69 Ω |
|
M8-1 (CAN) - H19-4 (CG) |
Ignition switch off |
200 Ω or higher |
|
M8-21 (CGND) - H19-4 (CG) |
Ignition switch off |
200 Ω or higher |
|
M8-1 (CAN) - H19-16 (BAT) |
Ignition switch off |
6 kΩ or higher |
|
M8-21 (CGND) - H19-16 (BAT) |
Ignition switch off |
6 kΩ or higher |
|
|
41. |
CONNECT CONNECTOR |
(a) Reconnect the H102 No. 3 junction connector.
|
|
42. |
CHECK FOR SHORT IN CAN BUS WIRES (COMBINATION METER ECU) |
|
(a) Disconnect the H37 combination meter ECU connector. |
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Switch Condition |
Specified Condition |
|---|---|---|
|
H37-22 (CANH) - H37-21 (CANL) |
Ignition switch off |
108 to 132 Ω |
|
H37-22 (CANH) - H19-4 (CG) |
Ignition switch off |
200 Ω or higher |
|
H37-21 (CANL) - H19-4 (CG) |
Ignition switch off |
200 Ω or higher |
|
H37-22 (CANH) - H19-16 (BAT) |
Ignition switch off |
6 kΩ or higher |
|
H37-21 (CANL) - H19-16 (BAT) |
Ignition switch off |
6 kΩ or higher |
|
|
43. |
CONNECT CONNECTOR |
(a) Reconnect the H104 No. 3 junction connector.
|
|
44. |
CHECK FOR SHORT IN CAN BUS WIRES (MAIN BODY ECU) |
|
|
(a) Disconnect the H2 main body ECU connector. |
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Switch Condition |
Specified Condition |
|---|---|---|
|
H2-16 (CANP) - H2-15 (CANN) |
Ignition switch off |
108 to 132 Ω |
|
H2-16 (CANP) - H19-4 (CG) |
Ignition switch off |
200 Ω or higher |
|
H2-15 (CANN) - H19-4 (CG) |
Ignition switch off |
200 Ω or higher |
|
H2-16 (CANP) - H19-16 (BAT) |
Ignition switch off |
6 kΩ or higher |
|
H2-16 (CANP) - H19-16 (BAT) |
Ignition switch off |
6 kΩ or higher |
|
|
45. |
CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - BATTERY AND BODY GROUND) |
(a) Reconnect the cable to the negative (-) battery terminal before measuring the resistances of the main wire and the branch wire.
(b) Disconnect the DA, DB and DD main body ECU connectors.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
DD-62 (GND1) - Body ground |
Always |
Below 1 Ω |
(d) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
DA-1 (ALTB) - Body ground |
Always |
11 to 14 V |
|
DB-13 (BECU) - Body ground |
|
|
|