| Last Modified: 04-05-2023 | 6.11:8.1.0 | Doc ID: RM1000000018YBV |
| Model Year Start: 2018 | Model: Sienna | Prod Date Range: [11/2017 - ] |
| Title: PRE-COLLISION: PRE-COLLISION SYSTEM: U1002; Lost Communication with Gateway Module; 2018 - 2020 MY Sienna [11/2017 - ] | ||
|
DTC |
U1002 |
Lost Communication with Gateway Module |
DESCRIPTION
This DTC is stored when the driving support ECU assembly cannot receive signals from the forward recognition camera or millimeter wave radar sensor assembly.
|
DTC No. |
Detection Item |
DTC Detection Condition |
Trouble Area |
|---|---|---|---|
|
U1002 |
Lost Communication with Gateway Module |
After the ignition switch is turned to ON, communication between the driving support ECU assembly and any of the following components is abnormal for 2 seconds or more
|
|
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
- Before measuring the resistance of the CAN bus, turn the ignition switch off and leave the vehicle for 1 minute or more without operating the key or any switches, or opening or closing the doors. After that, disconnect the cable from the negative (-) battery terminal and leave the vehicle for 1 minute or more before measuring the resistance.
-
After turning the ignition switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notices before proceeding with work.
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![2017 - 2020 MY Sienna [08/2016 - ]; INTRODUCTION: REPAIR INSTRUCTION: PRECAUTION](/t3Portal/stylegraphics/info.gif)
- When replacing the millimeter wave radar sensor assembly, always replace it with a new one. If a millimeter wave radar sensor assembly which was installed to another vehicle is used, the information stored in the millimeter wave radar sensor assembly will not match the information from the vehicle. As a result, a DTC may be stored.
-
When the millimeter wave radar sensor assembly is replaced with a new one, adjustment of the radar sensor beam axis must be performed.
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- When replacing the forward recognition camera, always replace it with a new one. If a forward recognition camera which was installed to another vehicle is used, the information stored in the forward recognition camera will not match the information from the vehicle. As a result, a DTC may be stored.
-
If the forward recognition camera has been replaced with a new one, be sure to perform forward recognition camera adjustment.
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HINT:
- Operating the ignition switch, any other switches or a door triggers related ECU and sensor communication on the CAN. This communication will cause the resistance value to change.
- Even after DTCs are cleared, if a DTC is stored again after driving the vehicle for a while, the malfunction may be occurring due to vibration of the vehicle. In such a case, wiggling the ECUs or wire harness while performing the inspection below may help determine the cause of the malfunction.
PROCEDURE
|
1. |
CHECK CAN BUS LINE (MALFUNCTION CONFIRMATION) |
(a) Turn the ignition switch off.
(b) Disconnect the cable from the negative (-) battery terminal.
|
(c) Measure the resistance according to the value(s) in the table below. Standard Resistance:
|
|
|
Result |
Proceed to |
|---|---|
|
OK |
A |
|
NG (Open circuit in main line or Driving support ECU assembly branch line) |
B |
|
NG (Short circuit between main lines) |
C |
|
NG (Short to +B or ground) |
D |
| B |
|
| C |
|
| D |
|
|
|
2. |
CHECK FOR DTCs (PRE-COLLISION SYSTEM) |
(a) Clear the DTCs.
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(b) Perform the following procedure.
HINT:
If the following procedure is not performed, the previously output DTC cannot be detected.
- Turn the ignition switch to ON and wait 2 seconds or more.
(c) Check for DTCs.
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|
Result |
Proceed to |
|---|---|
|
DTC U1002 is not output |
A |
|
DTC U1002 is output |
B |
| A |
|
| B |
|
|
3. |
CHECK FOR OPEN IN CAN BUS BRANCH LINES (DRIVING SUPPORT ECU ASSEMBLY) |
|
(a) Disconnect the driving support ECU assembly connector. |
|
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
A80-8 (CA1P) - A80-9 (CA1N) |
Cable disconnected from negative (-) battery terminal |
108 to 132 Ω |
HINT:
If the resistance is between 108 and 132 Ω, there may be an open in a CAN bus main line. If the value is 132 Ω or more, there may be an open in a CAN bus branch line between the No. 4 CAN junction connector and the driving support ECU assembly or a connector may be disconnected.
(c) Connect the driving support ECU assembly connector.
| NG |
|
|
|
4. |
CHECK FOR OPEN IN CAN BUS MAIN LINES (NO. 4 CAN JUNCTION CONNECTOR) |
|
(a) Disconnect the No. 4 CAN junction connector. |
|
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
Connected to |
|---|---|---|---|
|
D204-3 (CANH) - D204-14 (CANL) |
Cable disconnected from negative (-) battery terminal |
108 to 132 Ω |
Forward Recognition Camera |
|
D204-2 (CA1P) - D204-13 (CA1N) |
Cable disconnected from negative (-) battery terminal |
108 to 132 Ω |
Millimeter Wave Radar Sensor Assembly |
(c) Connect the No. 4 CAN junction connector.
|
Result |
Proceed to |
|---|---|
|
OK |
A |
|
NG (Forward Recognition Camera Main Line) |
B |
|
NG (Millimeter Wave Radar Sensor Assembly Main Line) |
C |
| A |
|
REPLACE NO. 5 CAN JUNCTION CONNECTOR |
| C |
|
|
|
5. |
CHECK FOR OPEN IN CAN BUS MAIN LINES (FORWARD RECOGNITION CAMERA) |
|
(a) Disconnect the forward recognition camera connector. |
|
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
T32-6 (CANH) - T32-12 (CANL) |
Cable disconnected from negative (-) battery terminal |
108 to 132 Ω |
(c) Connect the forward recognition camera connector.
| OK |
|
| NG |
|
REPAIR OR REPLACE CAN BUS MAIN LINE OR CONNECTOR (NO. 5 CAN JUNCTION CONNECTOR - FORWARD RECOGNITION CAMERA) |
|
6. |
CHECK FOR OPEN IN CAN BUS MAIN LINES (MILLIMETER WAVE RADAR SENSOR ASSEMBLY) |
|
(a) Disconnect the millimeter wave radar sensor assembly connector. |
|
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
A77-5 (CA1P) - A77-6 (CA1N) |
Cable disconnected from negative (-) battery terminal |
108 to 132 Ω |
(c) Connect the millimeter wave radar sensor assembly connector.
| OK |
|
| NG |
|
REPAIR OR REPLACE CAN BUS MAIN LINE OR CONNECTOR (NO. 5 CAN JUNCTION CONNECTOR - MILLIMETER WAVE RADAR SENSOR ASSEMBLY) |
|
7. |
CHECK FOR OPEN IN CAN BUS BRANCH LINES (NO. 4 CAN JUNCTION CONNECTOR - DRIVING SUPPORT ECU ASSEMBLY) |
|
(a) Disconnect the driving support ECU assembly connector. |
|
|
(b) Disconnect the No. 4 CAN junction connector. |
|
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
D204-1 (CA1P) - A80-8 (CA1P) |
Cable disconnected from negative (-) battery terminal |
Below 1 Ω |
|
D204-12 (CA1N) - A80-9 (CA1N) |
Cable disconnected from negative (-) battery terminal |
Below 1 Ω |
(d) Connect the No. 4 CAN junction connector.
(e) Connect the driving support ECU assembly connector.
| OK |
|
REPLACE NO. 4 CAN JUNCTION CONNECTOR |
| NG |
|
REPAIR OR REPLACE CAN BUS BRANCH WIRE (NO. 5 CAN JUNCTION CONNECTOR - DRIVING SUPPORT ECU ASSEMBLY) |
|
8. |
CHECK FOR SHORT BETWEEN CAN BUS LINES (FORWARD RECOGNITION CAMERA) |
|
(a) Disconnect the forward recognition camera connector. |
|
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
T32-6 (CANH) - T32-12 (CANL) |
Cable disconnected from negative (-) battery terminal |
108 to 132 Ω |
(c) Connect the forward recognition camera connector.
| OK |
|
|
|
9. |
CHECK FOR SHORT BETWEEN CAN BUS LINES (NO. 4 CAN JUNCTION CONNECTOR) |
|
(a) Disconnect the No. 4 CAN junction connector. |
|
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
Connected to |
|---|---|---|---|
|
D204-3 (CANH) - D204-14 (CANL) |
Cable disconnected from negative (-) battery terminal |
108 to 132 Ω |
Forward Recognition Camera |
|
D204-2 (CA1P) - D204-13 (CA1N) |
Cable disconnected from negative (-) battery terminal |
108 to 132 Ω |
Millimeter Wave Radar Sensor Assembly |
|
D204-1 (CA1P) - D204-12 (CA1N) |
Cable disconnected from negative (-) battery terminal |
200 Ω or higher |
Driving Support ECU Assembly |
(c) Connect the No. 4 CAN junction connector.
|
Result |
Proceed to |
|---|---|
|
OK |
A |
|
NG (Forward Recognition Camera Main Line) |
B |
|
NG (Millimeter Wave Radar Sensor Assembly Main Line) |
C |
|
NG (Driving Support ECU Assembly Branch Line) |
D |
| A |
|
REPLACE NO. 4 CAN JUNCTION CONNECTOR |
| B |
|
REPAIR OR REPLACE CAN BUS MAIN LINE OR CONNECTOR (NO. 4 CAN JUNCTION CONNECTOR - FORWARD RECOGNITION CAMERA) |
| D |
|
|
|
10. |
CHECK FOR SHORT BETWEEN CAN BUS LINES (MILLIMETER WAVE RADAR SENSOR ASSEMBLY) |
|
(a) Disconnect the millimeter wave radar sensor assembly connector. |
|
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
A77-5 (CA1P) - A77-6 (CA1N) |
Cable disconnected from negative (-) battery terminal |
108 to 132 Ω |
(c) Connect the millimeter wave radar sensor assembly connector.
| OK |
|
| NG |
|
REPAIR OR REPLACE CAN BUS MAIN LINE OR CONNECTOR (NO. 5 CAN JUNCTION CONNECTOR - MILLIMETER WAVE RADAR SENSOR ASSEMBLY) |
|
11. |
CHECK FOR SHORT BETWEEN CAN BUS LINES (DRIVING SUPPORT ECU ASSEMBLY) |
|
(a) Disconnect the driving support ECU assembly connector. |
|
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
A80-8 (CA1P) - A80-9 (CA1N) |
Cable disconnected from negative (-) battery terminal |
54 to 69 Ω |
(c) Connect the driving support ECU assembly connector.
| OK |
|
| NG |
|
REPAIR OR REPLACE CAN BUS BRANCH LINE OR CONNECTOR (NO. 5 CAN JUNCTION CONNECTOR - DRIVING SUPPORT ECU ASSEMBLY) |
|
12. |
CHECK FOR SHORT IN CAN BUS LINE (FORWARD RECOGNITION CAMERA) |
(a) Disconnect the forward recognition camera connector.
|
*1 |
DLC3 |
- |
- |
|
*a |
Front view of wire harness connector (to Forward Recognition Camera) |
- |
- |
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
T32-6 (CANH) - D16-4 (CG) |
Cable disconnected from negative (-) battery terminal |
200 Ω or higher |
|
T32-12 (CANL) - D16-4 (CG) |
Cable disconnected from negative (-) battery terminal |
200 Ω or higher |
|
T32-6 (CANH) - D16-16 (BAT) |
Cable disconnected from negative (-) battery terminal |
6 kΩ or higher |
|
T32-12 (CANL) - D16-16 (BAT) |
Cable disconnected from negative (-) battery terminal |
6 kΩ or higher |
(c) Connect the forward recognition camera connector.
| OK |
|
|
|
13. |
CHECK FOR SHORT IN CAN BUS LINE (NO. 5 CAN JUNCTION CONNECTOR) |
(a) Disconnect the No. 4 CAN junction connector.
|
*1 |
DLC3 |
- |
- |
|
*a |
Front view of wire harness connector (to No. 4 CAN Junction Connector) |
*b |
to Forward Recognition Camera |
|
*c |
to Millimeter Wave Radar Sensor Assembly |
*d |
to Driving Support ECU Assembly |
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
Connected to |
|---|---|---|---|
|
D204-3 (CANH) - D16-4 (CG) |
Cable disconnected from negative (-) battery terminal |
200 Ω or higher |
Forward Recognition Camera |
|
D204-14 (CANL) - D16-4 (CG) |
|||
|
D204-3 (CANH) - D16-16 (BAT) |
6 kΩ or higher |
||
|
D204-14 (CANL) - D16-16 (BAT) |
|||
|
D204-2 (CA1P) - D16-4 (CG) |
Cable disconnected from negative (-) battery terminal |
200 Ω or higher |
Millimeter Wave Radar Sensor Assembly |
|
D204-13 (CA1N) - D16-4 (CG) |
|||
|
D204-2 (CA1P) - D16-16 (BAT) |
6 kΩ or higher |
||
|
D204-13 (CA1N) - D16-16 (BAT) |
|||
|
D204-1 (CA1P) - D16-4 (CG) |
Cable disconnected from negative (-) battery terminal |
200 Ω or higher |
Driving Support ECU Assembly |
|
D204-12 (CA1N) - D16-4 (CG) |
|||
|
D204-1 (CA1P) - D16-16 (BAT) |
6 kΩ or higher |
||
|
D204-12 (CA1N) - D16-16 (BAT) |
(c) Connect the No. 4 CAN junction connector.
|
Result |
Proceed to |
|---|---|
|
OK |
A |
|
NG (Forward Recognition Camera Main Line) |
B |
|
NG (Millimeter Wave Radar Sensor Assembly Main Line) |
C |
|
NG (Driving Support ECU Assembly Branch Line) |
D |
| A |
|
REPLACE NO. 4 CAN JUNCTION CONNECTOR |
| B |
|
REPAIR OR REPLACE CAN BUS MAIN LINE OR CONNECTOR (NO. 4 CAN JUNCTION CONNECTOR - FORWARD RECOGNITION CAMERA) |
| D |
|
|
|
14. |
CHECK FOR SHORT IN CAN BUS LINE (MILLIMETER WAVE RADAR SENSOR ASSEMBLY) |
(a) Disconnect the millimeter wave radar sensor assembly connector.
|
*1 |
DLC3 |
- |
- |
|
*a |
Front view of wire harness connector (to Millimeter Wave Radar Sensor Assembly) |
- |
- |
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
A77-5 (CA1P) - D16-4 (CG) |
Cable disconnected from negative (-) battery terminal |
200 Ω or higher |
|
A77-6 (CA1N) - D16-4 (CG) |
Cable disconnected from negative (-) battery terminal |
200 Ω or higher |
|
A77-5 (CA1P) - D16-16 (BAT) |
Cable disconnected from negative (-) battery terminal |
6 kΩ or higher |
|
A77-6 (CA1N) - D16-16 (BAT) |
Cable disconnected from negative (-) battery terminal |
6 kΩ or higher |
(c) Connect the millimeter wave radar sensor assembly connector.
| OK |
|
| NG |
|
REPAIR OR REPLACE CAN BUS MAIN LINE OR CONNECTOR (NO. 5 CAN JUNCTION CONNECTOR - MILLIMETER WAVE RADAR SENSOR ASSEMBLY) |
|
15. |
CHECK FOR SHORT IN CAN BUS LINE (DRIVING SUPPORT ECU ASSEMBLY) |
(a) Disconnect the driving support ECU assembly connector.
|
*1 |
DLC3 |
- |
- |
|
*a |
Front view of wire harness connector (to Driving Support ECU Assembly) |
- |
- |
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
A80-8 (CA1P) - D16-4 (CG) |
Cable disconnected from negative (-) battery terminal |
200 Ω or higher |
|
A80-9 (CA1N) - D16-4 (CG) |
Cable disconnected from negative (-) battery terminal |
200 Ω or higher |
|
A80-8 (CA1P) - D16-16 (BAT) |
Cable disconnected from negative (-) battery terminal |
6 kΩ or higher |
|
A80-9 (CA1N) - D16-16 (BAT) |
Cable disconnected from negative (-) battery terminal |
6 kΩ or higher |
(c) Connect the driving support ECU assembly connector.
| OK |
|
| NG |
|
REPAIR OR REPLACE CAN BUS BRANCH LINE OR CONNECTOR (NO. 5 CAN JUNCTION CONNECTOR - DRIVING SUPPORT ECU ASSEMBLY) |
|
|