Lexus ES: Control Module Communication Bus OFF (U0073,U0126,U0142,U0182)
DESCRIPTION
These DTCs are stored if a CAN communication malfunction occurs between the headlight ECU sub-assembly RH and other ECUs.
for LED Type Turn Signal Light| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | DTC Output from |
|---|---|---|---|---|
| U0073 | Control Module Communication Bus OFF | The headlight ECU sub-assembly RH does not send/receive data. | CAN communication system | AFS (Sub) |
| U0126 | Lost Communication with Steering Angle Sensor Module | The headlight ECU sub-assembly RH does not receive data from the steering sensor for approximately 10 seconds or more. |
| AFS (Sub) |
| U0142 | Lost Communication with Body Control Module "B" | The headlight ECU sub-assembly RH does not receive data from the main body ECU (multiplex network body ECU) for approximately 10 seconds or more. |
| AFS (Sub) |
| U0182 | Lost Communication With Lighting Control Module Front | The headlight ECU sub-assembly RH does not receive data from the headlight ECU sub-assembly LH for approximately 10 seconds or more. |
| AFS (Sub) |
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | DTC Output from |
|---|---|---|---|---|
| U0073 | Control Module Communication Bus OFF | The headlight ECU sub-assembly RH does not send/receive data. | CAN communication system | HL AutoLeveling (Sub) |
| U0126 | Lost Communication with Steering Angle Sensor Module | The headlight ECU sub-assembly RH does not receive data from the steering sensor for approximately 10 seconds or more. |
| HL AutoLeveling (Sub) |
| U0142 | Lost Communication with Body Control Module "B" | The headlight ECU sub-assembly RH does not receive data from the main body ECU (multiplex network body ECU) for approximately 10 seconds or more. |
| HL AutoLeveling (Sub) |
| U0182 | Lost Communication With Lighting Control Module Front | The headlight ECU sub-assembly RH does not receive data from the headlight ECU sub-assembly LH for approximately 10 seconds or more. |
| HL AutoLeveling (Sub) |
PROCEDURE
| 1. | CONFIRM MODEL |
(a) Choose the model to be inspected.
| Result | Proceed to |
|---|---|
| for LED Type Turn Signal Light | A |
| for Bulb Type Turn Signal Light | B |
| B |  | GO TO STEP 4 |
|
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| 2. | CLEAR DTC |
(a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG).
(c) Turn the Techstream on.
(d) Enter the following menus: Body Electrical / AFS (Sub) / Trouble Codes.
(e) Clear the DTCs.
Body Electrical > AFS (Sub) > Clear DTCs
|
| 3. | CHECK FOR DTC |
(a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG).
(c) Wait 20 seconds or more.
(d) Turn the Techstream on.
(e) Enter the following menus: Body Electrical / AFS (Sub) / Trouble Codes.
(f) Check for DTCs.
Body Electrical > AFS (Sub) > Trouble CodesOK:
DTCs are not output.
| OK | | USE SIMULATION METHOD TO CHECK |
| NG | | GO TO CAN COMMUNICATION SYSTEM |
| 4. | CLEAR DTC |
(a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG).
(c) Turn the Techstream on.
(d) Enter the following menus: Body Electrical / HL AutoLeveling (Sub) / Trouble Codes.
(e) Clear the DTCs.
Body Electrical > HL AutoLeveling (Sub) > Clear DTCs
|
| 5. | CHECK FOR DTC |
(a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG).
(c) Wait 35 seconds or more.
(d) Turn the Techstream on.
(e) Enter the following menus: Body Electrical / HL AutoLeveling (Sub) / Trouble Codes.
(f) Check for DTCs.
Body Electrical > HL AutoLeveling (Sub) > Trouble CodesOK:
DTCs are not output.
| OK | | USE SIMULATION METHOD TO CHECK |
| NG | | GO TO CAN COMMUNICATION SYSTEM |
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Terminals Of Ecu
TERMINALS OF ECU HINT: Check from the rear of the connector while it is connected to the components. RADIO RECEIVER ASSEMBLY Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
*1: w/ Manual (SOS) Switch
*2: It is connected, but not used *3: w/o Manu
