| DTC Code | DTC Name |
|---|---|
| U0208 | Lost Communication with "Seat Control Module A" |
DESCRIPTION
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| U0208 |
|
|
This diagnosis procedure is for when DTC U0208 is output by the main body ECU (multiplex network body ECU) (GTS display: Main Body).
CAUTION / NOTICE / HINT
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Before measuring the resistance of the CAN bus, turn the power switch off and leave the vehicle for 1 minute or more without operating the key, switches or opening or closing the doors. After that, disconnect the cable from the negative (-) auxiliary battery terminal and leave the vehicle for 1 minute or more before measuring the resistance.
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After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work (Click here).
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Because the order of diagnosis is important to allow correct diagnosis, make sure to begin troubleshooting using How to Proceed with Troubleshooting when CAN communication system related DTCs are output (Click here).
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After performing repairs, perform the DTC check procedure and confirm that the DTCs are not output again.
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DTC check procedure: Turn the power switch on (IG) and wait at least 20 seconds.
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After the repair, perform CAN bus check and check that all the ECUs and sensors connected to the CAN communication system are displayed (Click here).
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Operating the power 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.
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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
- Click here
RECONFIRM DTC OUTPUT
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Reconfirm DTCs.
Tip: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 the sub bus 1.
Result Result Proceed to U1002 is not output from main body ECU (multiplex network body ECU) (GTS display: Main Body) A U1002 is output from main body ECU (multiplex network body ECU) (GTS display: Main Body) B
- AClick here
- B
GO TO DIAGNOSIS PROCEDURE INDICATED BY OUTPUT DTC (Click here)
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- Click here
CHECK VEHICLE TYPE
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Check vehicle type.
Result Result Proceed to for LHD A for RHD B
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- Click here
CHECK FOR OPEN IN SUB BUS 1 LINES (FRONT POWER SEAT SWITCH LH BRANCH LINE)
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Disconnect the cable from the negative (-) auxiliary battery terminal.
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Disconnect the X10 front power seat switch LH connector.
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Measure the resistance according to the value(s) in the table below.
Standard Resistance Tester Connection Condition Specified Condition X10-8 (CANP) - X10-7 (CANN) Cable disconnected from negative (-) auxiliary battery terminal 54 to 69 Ω Table 1. Text in Illustration *a Front view of wire harness connector
(to Front Power Seat Switch LH)
- OKClick here
- NG
REPAIR OR REPLACE CAN BRANCH LINE OR CONNECTOR (FRONT POWER SEAT SWITCH LH)
-
- Click here
CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)
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Disconnect the X9 front power seat switch LH connector.
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Measure the resistance according to the value(s) in the table below.
Standard Resistance Tester Connection Condition Specified Condition X9-2 (GND) - Body ground Cable disconnected from negative (-) auxiliary battery terminal Below 1 Ω -
Reconnect the cable to the negative (-) auxiliary battery terminal.
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Measure the voltage according to the value(s) in the table below.
Standard Voltage Tester Connection Condition Specified Condition X9-7 (+B) - Body ground Power switch off 11 to 14 V X10-12 (SYSB) - Body ground Power switch off 11 to 14 V Table 2. Text in Illustration *a Front view of wire harness connector
(to Front Power Seat Switch LH)
- OK
REPLACE FRONT POWER SEAT SWITCH LH (Click here)
- NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)
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- Click here
CHECK FOR OPEN IN SUB BUS 1 LINES (FRONT POWER SEAT SWITCH RH BRANCH LINE)
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Disconnect the cable from the negative (-) auxiliary battery terminal.
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Disconnect the W10 front power seat switch RH connector.
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Measure the resistance according to the value(s) in the table below.
Standard Resistance Tester Connection Condition Specified Condition W10-8 (CANP) - W10-7 (CANN) Cable disconnected from negative (-) auxiliary battery terminal 54 to 69 Ω Table 3. Text in Illustration *a Front view of wire harness connector
(to Front Power Seat Switch RH)
- OKClick here
- NG
REPAIR OR REPLACE CAN BRANCH LINE OR CONNECTOR (FRONT POWER SEAT SWITCH RH)
-
- Click here
CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)
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Disconnect the W9 front power seat switch RH connector.
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Measure the resistance according to the value(s) in the table below.
Standard Resistance Tester Connection Condition Specified Condition W9-2 (GND) - Body ground Cable disconnected from negative (-) auxiliary battery terminal Below 1 Ω -
Reconnect the cable to the negative (-) auxiliary battery terminal.
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Measure the voltage according to the value(s) in the table below.
Standard Voltage Tester Connection Condition Specified Condition W9-7 (+B) - Body ground Power switch off 11 to 14 V W10-12 (SYSB) - Body ground Power switch off 11 to 14 V Table 4. Text in Illustration *a Front view of wire harness connector
(to Front Power Seat Switch RH)
- OK
REPLACE FRONT POWER SEAT SWITCH RH (Click here)
- NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)
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