Toyota Avalon (XX50): Lost Communication with Airbag System Control Module Circuit Short to Ground (P310711). Lost Communication with Airbag System Control Module Circuit Short to Auxiliary Battery or Open (P310715). Lost

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual / Engine / Hybrid / Battery Control / Hybrid Control System / Lost Communication with Airbag System Control Module Circuit Short to Ground (P310711). Lost Communication with Airbag System Control Module Circuit Short to Auxiliary Battery or Open (P310715). Lost

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)
  • Wire harness or connector
  • Airbag ECU assembly
  • Hybrid vehicle control ECU

Does not come on

Master Warning Light:

Comes on
Related Data List

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.

Click here

  1. Connect the Techstream to the DLC3.
  2. Turn the power switch on (IG) and turn the Techstream on.
  3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
  4. Turn the power switch off and wait for 2 minutes or more.
  5. Turn the power switch on (IG) and turn the Techstream on.
  6. With power switch on (IG) and wait for 2 minutes or more.
  7. Enter the following menus: Powertrain / Hybrid Control / Utility / All Readiness.
  8. 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

GO TO DTC CHART (AIRBAG SYSTEM (for HV Model))

A

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.

Item

Contents

Terminal

G47-14 (ABFS) - G46-6 (E1)

Equipment Setting

5 V/DIV., 150 ms./DIV.

Condition

Power switch on (READY)
Result

Proceed to

The waveform appears as shown in the illustration.

A

The waveform differs from the one shown in the illustration.

B

*a

Component with harness connected

(Hybrid Vehicle Control ECU)

(d) Turn the power switch off.

B

GO TO STEP 6

A

3.

CLEAR DTC

Click here

NEXT

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

A

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 G50 airbag ECU assembly connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

G50-24 (GSW2) - G50-33 (E1)

Power switch off

10 kΩ or higher

*a

Component without harness connected

(Airbag ECU Assembly)

(c) Reconnect the G50 airbag ECU assembly connector.

NG

REPLACE AIR BAG ECU ASSEMBLY

OK

7.

CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - AIRBAG ECU ASSEMBLY)

(a) Disconnect the G47 hybrid vehicle control ECU connector.

(b) Disconnect the G50 airbag ECU assembly connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

G47-14 (ABFS) or G50-24 (GSW2) - Body ground and other terminals

Power switch off

10 kΩ or higher

*a

Rear view of wire harness connector

(to Hybrid Vehicle Control ECU)

*b

Front view of wire harness connector

(to Airbag ECU Assembly)

(d) Reconnect the G50 airbag ECU assembly connector.

(e) Reconnect the G47 hybrid vehicle control ECU connector.

OK

REPLACE HYBRID VEHICLE CONTROL ECU

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

Lost Communication with Airbag System Control Module Circuit Short to Auxiliary Battery or Open (P310715)

DESCRIPTION

Refer to the description for DTC P310711.

Click here

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Warning Indicate

P310715

Lost Communication with Airbag System Control Module Circuit Short to Auxiliary Battery or Open

Open or short to +B in the communication circuit

Communication from the airbag ECU assembly stopped and Circuit High has been detected for a certain period.

(1 trip detection logic)
  • Wire harness or connector
  • Airbag ECU assembly
  • Hybrid vehicle control ECU

Does not come on

Master Warning Light:

Comes on
Related Data List

DTC No.

Data List

P310715

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.

Click here

  1. Connect the Techstream to the DLC3.
  2. Turn the power switch on (IG) and turn the Techstream on.
  3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
  4. Turn the power switch off and wait for 2 minutes or more.
  5. Turn the power switch on (IG) and turn the Techstream on.
  6. With power switch on (IG) and wait for 15 seconds or more.
  7. Enter the following menus: Powertrain / Hybrid Control / Utility / All Readiness.
  8. 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

Refer to the wiring diagram for DTC P310711.

Click here

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

GO TO DTC CHART (AIRBAG SYSTEM (for HV Model))

A

2.

CHECK AIR BAG ECU ASSEMBLY (CHECK WAVEFORM)

Click here

Result

Proceed to

The waveform appears as shown in the illustration.

A

The waveform differs from the one shown in the illustration.

B
B

GO TO STEP 6

A

3.

CLEAR DTC

Click here

NEXT

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

P310715 is not output.

A

P310715 is output again.

B

(e) Turn the power switch off.

B

REPLACE HYBRID VEHICLE CONTROL ECU

A

5.

CHECK FOR INTERMITTENT PROBLEMS

Click here

OK

REPLACE HYBRID VEHICLE CONTROL ECU

NG

REPAIR OR REPLACE MALFUNCTIONING PARTS, COMPONENT AND AREA

6.

CHECK CONNECTOR CONNECTION CONDITION (HYBRID VEHICLE CONTROL ECU CONNECTOR)

Click here

NG

CONNECT SECURELY
OK

7.

CHECK CONNECTOR CONNECTION CONDITION (AIRBAG ECU ASSEMBLY CONNECTOR)

(a) Check the connector connections and contact pressure of the relevant terminals for the G50 airbag ECU assembly connector.

OK:

The connectors are connected securely and there are no contact pressure problems.

*a

Component with harness connected

(Airbag ECU Assembly)
NG

CONNECT SECURELY
OK

8.

CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - AIRBAG ECU ASSEMBLY)

(a) Disconnect the G47 hybrid vehicle control ECU connector.

(b) Disconnect the G50 airbag ECU assembly connector.

(c) Turn the power switch on (IG).

(d) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Condition

Specified Condition

G47-14 (ABFS) - Body ground

Power switch on (IG)

Below 1 V

NOTICE:

Turning the power switch on (IG) with the airbag ECU assembly connector and the hybrid vehicle control ECU connector disconnected causes other DTCs to be stored. Clear the DTCs after performing this inspection.

*a

Rear view of wire harness connector

(to Hybrid Vehicle Control ECU)

*b

Front view of wire harness connector

(to Airbag ECU Assembly)

(e) Turn the power switch off.

(f) Measure the resistance according to the value(s) in the table below.

Standard Resistance (Check for Open):

Tester Connection

Condition

Specified Condition

G47-14 (ABFS) - G50-24 (GSW2)

Power switch off

Below 1 Ω

Standard Resistance (Check for Short):

Tester Connection

Condition

Specified Condition

G47-14 (ABFS) or G50-24 (GSW2) - Body ground and other terminals

Power switch off

10 kΩ or higher

(g) Reconnect the G50 airbag ECU assembly connector.

(h) Reconnect the G47 hybrid vehicle control ECU connector.

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

9.

CHECK HYBRID VEHICLE CONTROL ECU

(a) Disconnect the G50 airbag ECU assembly connector.

(b) Turn the power switch on (IG).

(c) Measure the voltage according to the value(s) in the table below.

NOTICE:

Turning the power switch on (IG) with the airbag ECU assembly connector disconnected causes other DTCs to be stored. Clear the DTCs after performing this inspection.

Standard Voltage:

Tester Connection

Condition

Specified Condition

G47-14 (ABFS) - Body ground

Power switch on (IG)

11 to 14 V

*a

Component with harness connected

(Hybrid Vehicle Control ECU)

(d) Turn the power switch off.

(e) Reconnect the G50 airbag ECU assembly connector.

NG

REPLACE HYBRID VEHICLE CONTROL ECU

OK

10.

CHECK HARNESS AND CONNECTOR (AIRBAG ECU ASSEMBLY - BODY GROUND)

(a) Disconnect the G50 airbag ECU assembly connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance (Check for Open):

Tester Connection

Condition

Specified Condition

G50-33 (E1) - Body ground

Power switch off

Below 1 Ω

*a

Front view of wire harness connector

(to Airbag ECU Assembly)

(c) Reconnect the G50 airbag ECU assembly connector.

OK

REPLACE AIR BAG ECU ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

Lost Communication with Airbag System Control Module Signal Plausibility Failure (P310764)

DESCRIPTION

Refer to the description for DTC P310711.

Click here

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Warning Indicate

P310764

Lost Communication with Airbag System Control Module Signal Plausibility Failure

Abnormal communication signal:

Communication from the airbag ECU assembly stopped and signal plausibility failure has been detected for a certain period.

(1 trip detection logic)
  • Wire harness or connector
  • Airbag ECU assembly
  • Hybrid vehicle control ECU

Does not come on

Master Warning Light:

Comes on
Related Data List

DTC No.

Data List

P310764

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.

Click here

  1. Connect the Techstream to the DLC3.
  2. Turn the power switch on (IG) and turn the Techstream on.
  3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
  4. Turn the power switch off and wait for 2 minutes or more.
  5. Turn the power switch on (IG) and turn the Techstream on.
  6. With power switch on (IG) and wait for 2 minutes or more.
  7. Enter the following menus: Powertrain / Hybrid Control / Utility / All Readiness.
  8. 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

Refer to the wiring diagram for DTC P310711.

Click here

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

GO TO DTC CHART (AIRBAG SYSTEM (for HV Model))

A

2.

CLEAR DTC

Click here

NEXT

3.

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

P310764 is not output.

A

P310764 is output again.

B

(e) Turn the power switch off.

B

GO TO STEP 5

A

4.

CHECK FOR INTERMITTENT PROBLEMS

Click here

OK

REPLACE AIR BAG ECU ASSEMBLY

NG

REPAIR OR REPLACE MALFUNCTIONING PARTS, COMPONENT AND AREA

5.

CHECK AIR BAG ECU ASSEMBLY (CHECK WAVEFORM)

Click here

Result

Proceed to

The waveform appears as shown in the illustration.

A

The waveform differs from the one shown in the illustration.

B
A

REPLACE HYBRID VEHICLE CONTROL ECU

B

6.

CHECK CONNECTOR CONNECTION CONDITION (HYBRID VEHICLE CONTROL ECU CONNECTOR)

Click here

NG

CONNECT SECURELY
OK

7.

CHECK CONNECTOR CONNECTION CONDITION (AIRBAG ECU ASSEMBLY CONNECTOR)

Click here

NG

CONNECT SECURELY
OK

8.

CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - AIRBAG ECU ASSEMBLY)

Click here

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

9.

CHECK HARNESS AND CONNECTOR (AIRBAG ECU ASSEMBLY - BODY GROUND)

Click here

OK

REPLACE AIR BAG ECU ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

Hybrid/EV Battery Block 1 Circuit Resistance Out of Range (Extreme) (P301100,...,P30211E)

Lost Communication with Drive Motor Control Module "A" from Hybrid/EV Control Module Missing Message (P312387)

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Toyota Avalon (XX50) 2019-2022 Service & Repair Manual

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