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.
-
After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal.
Click here
.gif)
-
When disconnecting and reconnecting the auxiliary battery.
Click here
HINT:
When disconnecting and reconnecting the auxiliary battery, there is an automatic learning function that completes learning when the respective system is used.
Click here
-
Some parts must be initialized and set when replacing or removing and installing parts.
Click here
-
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
-
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.
-
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
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 |
|
.gif)
| 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 |
READ NEXT:
Lost Communication with Rear Gate Module (U0230)
DESCRIPTION DTC No. Detection Item DTC Detection Condition Trouble Area DTC Output from U0230 Lost Communication with Rear Gate Module There is no communication from the multiplex n
Lost Communication with Gateway Module (Main Body ECU) (U1002)
DESCRIPTION
The main body ECU (multiplex network body ECU) will store this DTC when no signals can be received from the ECUs that have been memorized as those that are connected to sub bus 1.
Whe
Lost Communication with Tilt & (U1115)
DESCRIPTION DTC No. Detection Item DTC Detection Condition Trouble Area DTC Output from U1115 Lost Communication with Tilt & Telescopic Module There is no communication from the
SEE MORE:
Sensor of Rear Motor Inverter Temperature (P0AF3-676,P0AF6-675)
DTC SUMMARY MALFUNCTION DESCRIPTION These DTCs indicate the temperature sensor value for rear motor inverter is abnormal. The cause of this malfunction may be one of the following: Internal inverter malfunction
Inverter with converter assembly internal circuit malfunction
Hybrid cooling syste
Removal
REMOVAL PROCEDURE 1. REMOVE CONSOLE ARMREST ASSEMBLY (for Front Side) Click here 2. REMOVE UPPER NO. 2 CONSOLE PANEL GARNISH (for Front Side) Click here 3. REMOVE DOOR SCUFF PLATE ASSEMBLY LH (for Front Side) Click here 4. REMOVE COWL SIDE TRIM BOARD LH (for Front Side) Click here
