Lexus NX: 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 multiplex tilt and telescopic ECU. |
| Main Body |
For vehicles with a power tilt and power telescopic steering column.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
- Inspect the fuses for circuits related to this system before performing the following 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 or any 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 the 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 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. | RECONFIRM DTC OUTPUT |
(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 (MULTIPLEX TILT AND TELESCOPIC ECU BRANCH WIRE) |
| (a) Disconnect the cable from the negative (-) auxiliary battery terminal. |
|
(b) Disconnect the multiplex tilt and telescopic ECU connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| I60-3 (CANP) - I60-11 (CANN) | Cable disconnected from negative (-) auxiliary battery terminal | 54 to 69 Ω |
| NG | | REPAIR OR REPLACE CAN BRANCH WIRE OR CONNECTOR (MULTIPLEX TILT AND TELESCOPIC ECU) |
|
| 3. | CHECK HARNESS AND CONNECTOR (MULTIPLEX TILT AND TELESCOPIC ECU - BATTERY AND BODY GROUND) |
| (a) Reconnect the cable to the negative (-) auxiliary battery terminal. |
|
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
| Tester Connection | Switch Condition | Specified Condition |
|---|---|---|
| I60-2 (+B) - Body ground | Power switch off | 11 to 14 V |
| I60-9 (ECUB) - Body ground | Power switch off | 11 to 14 V |
| I60-10 (IG) - Body ground | Power switch on (IG) | 11 to 14 V |
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| I60-1 (GND) - Body ground | Always | Below 1 Ω |
| I60-8 (GND2) - Body ground | Always | Below 1 Ω |
| OK | | REPLACE MULTIPLEX TILT AND TELESCOPIC ECU |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
READ NEXT:
Hybrid Vehicle Control ECU Communication Stop Mode
DESCRIPTION Detection Item Symptom Trouble Area Hybrid Vehicle Control ECU Communication Stop Mode Any of the following conditions are met:
Communication stop for "Hybrid Vehicle Contr
Skid Control ECU Communication Stop Mode
DESCRIPTION Detection Item Symptom Trouble Area Skid Control ECU Communication Stop Mode Any of the following conditions are met:
Communication stop for "Skid Control (ABS/VSC/TRAC)" i
Clearance Warning ECU Communication Stop Mode
DESCRIPTION Detection Item Symptom Trouble Area Clearance Warning ECU Communication Stop Mode Any of the following conditions are met:
Communication stop for "Clearance Warning (Intuit
SEE MORE:
Theft Warning Siren Circuit
DESCRIPTION The theft warning siren has an internal battery. If the vehicle auxiliary battery cable is disconnected or any of the communication lines are open, the theft warning siren detects this and sounds its siren. Although the theft warning siren usually sounds by receiving a signal from the ma
DC / DC Converter Status Circuit Low Input (P0A09-265)
DESCRIPTION Refer to the description for DTC P0A08-264. Click here The hybrid vehicle control ECU sends a signal to the DC/DC converter to prohibit its control and receives signals indicating a normal or abnormal (below 11 V auxiliary battery voltage) condition of the 12 V charging system from th
