DTC P3107-214: Airbag ECU Communication Circuit Malfunction: Procedure

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG).
3. Select the following menu items: Body Electrical / SRS Airbag / Trouble Codes.
4. Check if DTCs are output.

   Result

   Result	Proceed to
   Airbag system DTCs are not output.	A
   Airbag system DTCs are output.	B

B → See step   11 

A: Go to next step 

1. Connect an oscilloscope to the airbag ECU assembly terminals specified in the table below, and measure the waveform.
   Fig 1: Identifying L73 Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Item	Contents
   Terminal	L73-14 (GSW2) - L73-25 (E1)
   Equipment Setting	5 V/DIV., 500 ms./DIV.
   Condition	Power switch on (READY)

   Result

   Result	Proceed to
   The waveform appears as shown in the illustration.	A
   The waveform differs from the one shown in the illustration.	B

B → See step   6 

A: Go to next step 

1. Select the following menu items: Body Electrical / SRS Airbag / Trouble Codes.
2. Read and record the DTCs and freeze frame data.
3. Select the following menu items: Body Electrical / SRS Airbag / Trouble Codes.
4. Clear DTCs.
5. Select the following menu items: Powertrain / Hybrid Control / Trouble Codes.
6. Read and record the DTCs and freeze frame data.
7. Select the following menu items: Powertrain / Hybrid Control / Trouble Codes.
8. Clear DTCs and freeze frame data.

NEXT: Go to next step 

1. Select the following menu items: Powertrain / Hybrid Control / Trouble Codes.
2. Check if DTCs are output.

   Result

   Result	Proceed to
   P3107-214 is not output.	A
   P3107-214 is output again.	B

B → See step   9 

A: Go to next step 

1. Check for intermittent problems. Refer to CHECK FOR INTERMITTENT PROBLEMS .

YES → REPAIR OR REPLACE MALFUNCTIONING PARTS, COMPONENT AND AREA 

NO → See step   9 

1. Check the connections of the hybrid vehicle control ECU and airbag ECU assembly connectors.
   Fig 2: Identifying Connections Of Hybrid Vehicle Control ECU And Airbag ECU Assembly Connectors

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   OK

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

NG → CONNECT SECURELY 

OK: Go to next step 

1. Turn the power switch off.
2. Disconnect connector A76 from the hybrid vehicle control ECU.
   Fig 3: Check Harness And Connector (Hybrid Vehicle Control ECU - Airbag ECU Assembly)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Disconnect connector L73 from the airbag ECU assembly.
4. Turn the power switch on (IG).
5. Measure the voltage according to the value(s) in the table below.

   Standard voltage

   Tester Connection	Switch Condition	Specified Condition
   A76-31 (ABFS) - Body ground	Power switch on (IG)	Below 1 V

   NOTE:

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

6. Turn the power switch off.
7. Measure the resistance according to the value(s) in the table below.

   Standard resistance (Check for open)

   Tester Connection	Switch Condition	Specified Condition
   A76-31 (ABFS) - L73-14 (GSW2)	Power switch off	Below 1 Ω

   Standard resistance (Check for short)

   Tester Connection	Switch Condition	Specified Condition
   A76-31 (ABFS) or L73-14 (GSW2) - Body ground and other terminals	Power switch off	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Turn the power switch off.
   Fig 4: Identifying Hybrid Vehicle Control ECU Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Connect the hybrid vehicle control ECU connector.
3. Measure the voltage according to the value(s) in the table below.

   Standard voltage

   Tester Connection	Switch Condition	Specified Condition
   L73-14 (GSW2) - Body ground	Power switch on (IG)	11 to 14 V

NG → See step   9 

OK → See step   10