Toyota Corolla Cross Owners & Service Manuals

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

Toyota Corolla Cross (2022-2024) Service Manual / Engine & Hybrid System / Hybrid / Battery Control / Hybrid Control System / 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

Note

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:

Comes on

SAE Code:

P3107

CONFIRMATION DRIVING PATTERN

HINT:

After repairs have 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 GTS to the DLC3.
  2. Turn the ignition switch to ON and turn the GTS on.
  3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
  4. Turn the ignition switch off and wait for 2 minutes or more.
  5. Turn the ignition switch to ON and turn the GTS on.
  6. With ignition switch to ON 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) Check for DTCs.

Body Electrical > SRS Airbag > Trouble Codes
Result

Proceed to

DTCs are not output

A

DTCs are output

B
B

GO TO DTC CHART (AIRBAG SYSTEM)

A

2.

CHECK AIRBAG 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) Check for DTCs.

Powertrain > Hybrid Control > Trouble Codes
Result

Proceed to

P310715 is not output

A

P310715 is output again

B
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 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 hybrid vehicle control ECU connector.

(b) Disconnect the airbag ECU assembly connector.

(c) Turn the ignition switch to ON.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

I249-12 (ABFS) - Body ground

Ignition switch ON

Below 1 V

NOTICE:

Turning the ignition switch to ON 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.

(e) Turn the ignition 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

I249-12 (ABFS) - I47-24 (GSW2)

Ignition switch off

Below 1 Ω

Standard Resistance (Check for Short):

Tester Connection

Condition

Specified Condition

I249-12 (ABFS) or I47-24 (GSW2) - Body ground and other terminals

Ignition switch off

10 kΩ or higher

HINT:

As necessary, check that there are no wires shorted to power supply when performing the above wire harness inspection.

(g) Reconnect the airbag ECU assembly connector.

(h) Reconnect the hybrid vehicle control ECU connector.

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

9.

CHECK HYBRID VEHICLE CONTROL ECU

(a) Disconnect the airbag ECU assembly connector.

(b) Turn the ignition switch to ON.

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

*a

Component with harness connected

(Hybrid Vehicle Control ECU)

-

-

NOTICE:

Turning the ignition switch to ON 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

I249-12 (ABFS) - Body ground

Ignition switch ON

11 to 14 V

(d) Turn the ignition switch off.

(e) Reconnect the airbag ECU assembly connector.

NG

REPLACE HYBRID VEHICLE CONTROL ECU

OK

10.

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

(a) Disconnect the airbag ECU assembly connector.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

I47-33 (E1) - Body ground

Ignition switch off

Below 1 Ω

(c) Reconnect the airbag ECU assembly connector.

OK

REPLACE AIRBAG ECU ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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