Lexus ES: Lost Communication with Airbag System Control Module Circuit Short to Ground (P310711)
DESCRIPTION
The hybrid vehicle control ECU detects a problem in the collision signal line from the airbag ECU assembly and alerts the driver.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | MIL | Warning Indicate |
|---|---|---|---|---|---|
| P310711 | Lost Communication with Airbag System Control Module Circuit Short to Ground | Short to ground in the communication circuit: Communication from the airbag ECU assembly stopped and Circuit Low has been detected for a certain period. (1 trip detection logic) |
| Does not come on | Master Warning Light: Comes on |
| DTC No. | Data List |
|---|---|
| P310711 | Airbag Status (Collision) |
CONFIRMATION DRIVING PATTERN
HINT:
After repair has been completed, clear the DTCs and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.
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- Connect the Techstream to the DLC3.
- Turn the power switch on (IG) and turn the Techstream on.
- Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
- Turn the power switch off and wait for 2 minutes or more.
- Turn the power switch on (IG) and turn the Techstream on.
- With power switch on (IG) and wait for 2 minutes or more.
- Enter the following menus: Powertrain / Hybrid Control / Utility / All Readiness.
-
Check the DTC judgment result.
HINT:
- If the judgment result shows NORMAL, the system is normal.
- If the judgment result shows ABNORMAL, the system has a malfunction.
- If the judgment result shows INCOMPLETE or N/A, perform driving pattern again.
WIRING DIAGRAM
PROCEDURE
| 1. | CHECK DTC OUTPUT (SRS AIRBAG) |
(a) Connect the Techstream to the DLC3.
(b) Turn the power switch on (IG).
(c) Enter the following menus: Body Electrical / SRS Airbag / Trouble Codes.
(d) Check for DTCs.
Body Electrical > SRS Airbag > Trouble Codes| Result | Proceed to |
|---|---|
| Airbag system DTCs are not output. | A |
| Airbag system DTCs are output. | B |
(e) Turn the power switch off.
| B | .gif) | GO TO DTC CHART (AIRBAG SYSTEM (for HV Model)) |
|
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| 2. | CHECK AIR BAG ECU ASSEMBLY (CHECK WAVEFORM) |
(a) Connect an oscilloscope between the hybrid vehicle control ECU terminals specified in the table below.
(b) Turn the power switch on (READY).
| (c) Measure the waveform.
|
|
(d) Turn the power switch off.
| B | | GO TO STEP 6 |
|
| 3. | CLEAR DTC |
Click here
|
| 4. | CHECK DTC OUTPUT (HYBRID CONTROL) |
(a) Connect the Techstream to the DLC3.
(b) Turn the power switch on (IG).
(c) Enter the following menus: Powertrain / Hybrid Control / Trouble Codes.
(d) Check for DTCs.
Powertrain > Hybrid Control > Trouble Codes| Result | Proceed to |
|---|---|
| P310711 is not output. | A |
| P310711 is output. | B |
(e) Turn the power switch off.
| B | | REPLACE HYBRID VEHICLE CONTROL ECU |
|
| 5. | CHECK FOR INTERMITTENT PROBLEMS |
Click here
| OK | | REPLACE HYBRID VEHICLE CONTROL ECU |
| NG | | REPAIR OR REPLACE MALFUNCTIONING PARTS, COMPONENT AND AREA |
| 6. | CHECK AIR BAG ECU ASSEMBLY |
(a) Disconnect the G64 airbag ECU assembly connector.
| (b) Measure the resistance according to the value(s) in the table below. Standard Resistance:
|
|
(c) Reconnect the G64 airbag ECU assembly connector.
| NG | | REPLACE AIR BAG ECU ASSEMBLY |
|
| 7. | CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - AIRBAG ECU ASSEMBLY) |
(a) Disconnect the G60 hybrid vehicle control ECU connector.
(b) Disconnect the G64 airbag ECU assembly connector.
| (c) Measure the resistance according to the value(s) in the table below. Standard Resistance:
|
|
(d) Reconnect the G64 airbag ECU assembly connector.
(e) Reconnect the G60 hybrid vehicle control ECU connector.
| OK | | REPLACE HYBRID VEHICLE CONTROL ECU |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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(a) Connect the Techstream to the DLC3. (
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