Lexus NX: Lost Communication with "Seat Control Module A" (U0208)
DESCRIPTION
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | DTC Output from |
|---|---|---|---|---|
| U0208 | Lost Communication with "Seat Control Module A" | There is no communication from the front power seat switch LH. |
| Main Body |
For vehicles with a memory.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
- Inspect the fuses for circuits related to this system before performing the following inspection procedure.
- 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.
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When disconnecting and reconnecting the auxiliary battery.
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HINT:
When disconnecting and reconnecting the auxiliary battery, there is an automatic learning function that completes learning when the respective system is used.
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Some parts must be initialized and set when replacing or removing and installing parts.
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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.
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After performing repairs, perform the DTC check procedure and confirm that the DTCs are not output again.
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.
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HINT:
- Operating the power switch, any switches or any doors triggers related ECU and sensor communication with the CAN, which causes resistance variation.
- 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 FOR DTC |
(a) Check for DTCs.
Body Electrical > Main Body > Trouble CodesHINT:
If DTC U1002 is output from the gateway 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 |
|---|---|
| DTC U1002 is not output from main body ECU (multiplex network body ECU) | A |
| DTC U1002 is output from main body ECU (multiplex network body ECU) | B |
| B | .gif) | GO TO DIAGNOSIS PROCEDURE INDICATED BY OUTPUT DTC |
|
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| 2. | CHECK FOR OPEN IN CAN BUS WIRE (FRONT POWER SEAT SWITCH LH BRANCH WIRE) |
| (a) Disconnect the cable from the negative (-) auxiliary 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 |
|---|---|---|
| g12-8 (CANP) - g12-7 (CANN) | Cable disconnected from negative (-) auxiliary battery terminal | 54 to 69 Ω |
| NG | | REPAIR OR REPLACE CAN BRANCH WIRE OR CONNECTOR (FRONT POWER SEAT SWITCH LH) |
|
| 3. | CHECK HARNESS AND CONNECTOR (FRONT POWER SEAT SWITCH LH - BATTERY AND BODY GROUND) |
| (a) Reconnect the cable to the negative (-) auxiliary battery terminal. |
|
(b) Disconnect the front power seat switch LH connector.
(c) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
| Tester Connection | Switch Condition | Specified Condition |
|---|---|---|
| g12-12 (SYSB) - Body ground | Power switch off | 11 to 14 V |
| g11-7 (+B) - Body ground | Power switch off | 11 to 14 V |
| g12-3 (IG) - Body ground | Power switch on (IG) | 11 to 14 V |
(d) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| g11-2 (GND) - Body ground | Always | Below 1 Ω |
| OK | | REPLACE FRONT POWER SEAT SWITCH LH |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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