Lexus ES: Open in Bus 1 Main Bus Line
DESCRIPTION
There may be an open circuit in one of the CAN main bus lines when the resistance between terminals 23 (CA1H) and 8 (CA1L) of the central gateway ECU (network gateway ECU) is 70 Ω or higher.
| Symptom | Trouble Area |
|---|---|
| Resistance between terminals 23 (CA1H) and 8 (CA1L) of the central gateway ECU (network gateway ECU) is 70 Ω or higher. |
|
This malfunction is not related to the lines of a CAN branch or to ECUs or sensors connected to a CAN branch.
WIRING DIAGRAM
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CAUTION / NOTICE / HINT
CAUTION:
When performing the confirmation driving pattern, obey all speed limits and traffic laws.
NOTICE:
-
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 engine 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 (-) battery terminal and leave the vehicle for 1 minute or more before measuring the resistance.
-
After turning the engine switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) 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 engine 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.
-
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 FOR OPEN IN CAN MAIN BUS LINES (NO. 1 CAN JUNCTION CONNECTOR) |
(a) Disconnect the cable from the negative (-) battery terminal.
(b) Disconnect the A68 No. 1 CAN junction connector.
(c) Measure the resistance according to the value(s) in the table below.
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| *a | Front view of wire harness connector (to No. 1 CAN Junction Connector) | *b | to Central Gateway ECU (Network Gateway ECU) |
| *c | to No. 6 CAN Junction Connector | - | - |
Standard Resistance:
| Tester Connection | Condition | Specified Condition | Connected to |
|---|---|---|---|
| A68-4 (CANH) - A68-14 (CANL) | Cable disconnected from negative (-) battery terminal | 108 to 132 Ω | Central gateway ECU (network gateway ECU) |
| A68-6 (CANH) - A68-16 (CANL) | Cable disconnected from negative (-) battery terminal | 108 to 132 Ω | No. 6 CAN junction connector |
| Result | Proceed to |
|---|---|
| OK | A |
| NG (Line to central gateway ECU (network gateway ECU)) | B |
| NG (Line to No. 6 CAN junction connector) | C |
| A | .gif) | REPLACE NO. 1 CAN JUNCTION CONNECTOR |
| C | | GO TO STEP 3 |
|
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| 2. | CHECK FOR OPEN IN CAN MAIN BUS LINES (CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU)) |
(a) Reconnect the A68 No. 1 CAN junction connector.
(b) Disconnect the G66 central gateway ECU (network gateway ECU) connector.
| (c) Measure the resistance according to the value(s) in the table below. Standard Resistance:
|
|
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| OK | | REPLACE CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU) |
| NG | | REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU) - NO. 1 CAN JUNCTION CONNECTOR) |
| 3. | CHECK FOR OPEN IN CAN MAIN BUS LINES (NO. 6 CAN JUNCTION CONNECTOR) |
(a) Reconnect the A68 No. 1 CAN junction connector.
(b) Disconnect the N98 No. 6 CAN junction connector.
(c) Measure the resistance according to the value(s) in the table below.
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| *a | Front view of wire harness connector (to No. 6 CAN Junction Connector) | *b | to No. 1 CAN Junction Terminal |
| *c | to No. 1 CAN Junction Connector | - | - |
Standard Resistance:
| Tester Connection | Condition | Specified Condition | Connected to |
|---|---|---|---|
| N98-1 (CANH) - N98-11 (CANL) | Cable disconnected from negative (-) battery terminal | 108 to 132 Ω | No. 1 CAN junction terminal |
| N98-5 (CANH) - N98-15 (CANL) | Cable disconnected from negative (-) battery terminal | 108 to 132 Ω | No. 1 CAN junction connector |
| Result | Proceed to |
|---|---|
| OK | A |
| NG (Line to No. 1 CAN junction connector) | B |
| NG (Line to No. 1 CAN junction terminal) | C |
| A | | REPLACE NO. 6 CAN JUNCTION CONNECTOR |
| B | | REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NO. 6 CAN JUNCTION CONNECTOR - NO. 1 CAN JUNCTION CONNECTOR) |
|
| 4. | CHECK FOR OPEN IN CAN MAIN BUS LINES (NO. 1 CAN JUNCTION TERMINAL) |
(a) Reconnect the N98 No. 6 CAN junction connector.
(b) Disconnect the N105 No. 1 CAN junction terminal connector.
| (c) Measure the resistance according to the value(s) in the table below. Standard Resistance:
|
|
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| OK | | REPLACE NO. 1 CAN JUNCTION TERMINAL |
| NG | | REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NO. 1 CAN JUNCTION TERMINAL - NO. 6 CAN JUNCTION CONNECTOR) |
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