Lexus ES: Bus Buffer ECU Communication Stop Mode
DESCRIPTION
| Detection Item | Symptom | Trouble Area |
|---|---|---|
| Bus Buffer ECU Communication Stop Mode | Any of the following conditions are met:
|
|
WIRING DIAGRAM
CAUTION / NOTICE / HINT
CAUTION:
When performing the confirmation driving pattern, obey all speed limits and traffic laws.
NOTICE:
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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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- 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.
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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.
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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 for 1 minute or more. Then operate the suspected malfunctioning system and drive the vehicle at 60 km/h (37 mph) or more for 5 minutes or more.
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After the repair, perform the CAN bus check and check that all the ECUs and sensors connected to the CAN communication system are displayed as normal.
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HINT:
- Before disconnecting related connectors for inspection, push in on each connector body to check that the connector is not loose or disconnected.
- When a connector is disconnected, check that the terminals and connector body are not cracked, deformed or corroded.
PROCEDURE
| 1. | CHECK OPTIONS |
(a) Check whether dealer installed options that support CAN communication are installed.
| Result | Proceed to |
|---|---|
| Installed | A |
| Not installed | B |
| B | .gif) | GO TO STEP 4 |
|
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| 2. | CHECK FOR OPEN IN CAN BUS LINES (OPTION CONNECTOR (BUS BUFFER ECU) BRANCH LINE) |
(a) Disconnect the cable from the negative (-) auxiliary battery terminal.
(b) Disconnect the G80 option connector (bus buffer ECU).
HINT:
Disconnect any CAN compatible optional devices from the option connector.
| (c) Measure the resistance according to the value(s) in the table below. Standard Resistance:
|
|
| NG | | REPAIR OR REPLACE CAN BRANCH LINES OR CONNECTOR (OPTION CONNECTOR (BUS BUFFER ECU)) |
|
| 3. | CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT) |
| (a) Measure the resistance according to the value(s) in the table below. Standard Resistance:
|
|
(b) Reconnect the cable to the negative (-) auxiliary battery terminal.
(c) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| G80-3 (R+B) - Body ground | Power switch off | 11 to 14 V |
| OK | | REPAIR OR REPLACE CAN COMPATIBLE OPTIONAL DEVICE |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT) |
| 4. | CHECK FOR DTC |
(a) Connect the Techstream to the DLC3.
(b) Turn the power switch on (IG).
(c) Turn the Techstream on.
(d) Enter the following menus: Body Electrical / Main Body / Utility / Initialization.
Body Electrical > Main Body > Utility| Tester Display |
|---|
| Initialization |
(e) Enter the following menus: Body Electrical / Central Gateway / Utility / Initialization.
Body Electrical > Central Gateway > Utility| Tester Display |
|---|
| Initialization |
(f) Enter the following menus: Body Electrical / Main Body / Clear DTCs.
Body Electrical > Main Body > Clear DTCs(g) Enter the following menus: Body Electrical / Main Body / Trouble Codes.
Body Electrical > Main Body > Trouble Codes| Result | Proceed to |
|---|---|
| DTC U1117 is not output from main body ECU (multiplex network body ECU) | A |
| DTC U1117 is output from main body ECU (multiplex network body ECU) | B |
| A | | END |
| B | | REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) |
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