Last Modified: 04-05-2023 |
6.11:8.1.0 |
Doc ID: RM1000000018DL1 |
Model Year Start: 2018 |
Model: Sienna |
Prod Date Range: [11/2017 - 08/2018] |
Title: NETWORKING: CAN COMMUNICATION SYSTEM: U0208; Lost Communication with "Seat Control Module A"; 2018 MY Sienna [11/2017 - 08/2018] |
DTC
|
U0208
|
Lost Communication with "Seat Control Module A"
|
DESCRIPTION
DTC Code
|
DTC Detection Condition
|
Trouble Area
|
U0208
|
There is no communication from the position control ECU and switch.
|
-
Power source circuit of front power seat switch LH
-
Front power seat switch LH
-
Front power seat switch LH branch wire or connector
|
HINT:
For vehicle with seat position memory system only.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
CAUTION:
When performing the confirmation driving pattern, obey all speed limits and traffic laws.
HINT:
-
Before disconnecting related connectors for inspection, push in on each connector body to check that the connector is not loose or disconnected.
-
When a connector is disconnected, check that the terminals and connector body are not cracked, deformed or corroded.
PROCEDURE
(a) Reconfirm DTCs.
HINT:
If DTC U1002 is output from Main Body of the main body ECU (multiplex network body ECU), this indicates a sub bus 1 malfunction. Troubleshoot for DTC U1002 and check for malfunctions in sub bus 1.
Result
|
Proceed to
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DTC U1002 is not output from main body ECU (multiplex network body ECU) (Techstream display: Main Body)
|
A
|
DTC U1002 is output from main body ECU (multiplex network body ECU) (Techstream display: Main Body)
|
B
|
A
|
|
|
2.
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CHECK FOR OPEN IN CAN BUS WIRE (FRONT POWER SEAT SWITCH LH BRANCH WIRE)
|
(a) Disconnect the cable from the negative (-) battery terminal.
(b) Disconnect the front power seat switch LH connector.
|
|
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
|
Condition
|
Specified Condition
|
Y9-8 - Y9-7
|
Cable disconnected from negative (-) battery terminal
|
54 to 69 Ω
|
Text in Illustration
*a
|
Front view of wire harness connector
(to Front Power Seat Switch LH)
|
NG |
|
REPAIR OR REPLACE CAN BRANCH WIRE OR CONNECTOR
|
OK
|
|
|
3.
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CHECK HARNESS AND CONNECTOR (FRONT POWER SEAT SWITCH LH - POWER SOURCE)
|
(a) Disconnect the front power seat switch LH connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
|
Condition
|
Specified Condition
|
Y8-2 - Body ground
|
Cable disconnected from negative (-) battery terminal
|
Below 1 Ω
|
(c) Reconnect the cable to the negative (-) battery terminal.
NOTICE:
When disconnecting the cable, some systems need to be initialized after the cable is reconnected (See page
)
(d) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection
|
Condition
|
Specified Condition
|
Y8-7 - Body ground
|
Always
|
11 to 14 V
|
Text in Illustration
*a
|
Front view of wire harness connector
(to Front Power Seat Switch LH)
|
NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR
|
|