Lexus NX manuals

Lexus NX: Lost Communication with Airbag System Control Module (P3107-213)

Lexus NX Service Manual / Engine & Hybrid System / 2ar-fxe (hybrid / Battery Control) / Hybrid Control System / Lost Communication with Airbag System Control Module (P3107-213)

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

P3107-213

Lost Communication with Airbag System Control Module

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

P3107-213

Collision Signal (Airbag)

WIRING DIAGRAM

Refer to the wiring diagram for DTC P3107-214.

Click here

CAUTION / NOTICE / HINT

HINT:

After the repair, clear the DTCs and perform the following procedure to check that DTCs are not output.

  1. Turn the power switch on (IG) and wait for 15 seconds or more.

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

(e) Turn the power switch off.

Airbag system DTCs are output.

GO TO DTC CHART (AIRBAG SYSTEM)

Airbag system DTCs are not output.

2.

CHECK AIRBAG ECU ASSEMBLY (CHECK WAVEFORM)

(a) Connect an oscilloscope between the airbag ECU assembly terminals specified in the table below.

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

(c) Measure the waveform.

Item

Contents

Terminal

I58-14 (GSW2) - I58-25 (E1)

Equipment Setting

5 V/DIV., 500 ms./DIV.

Condition

Power switch on (READY)

*a

Component with harness connected

(Airbag ECU Assembly)

(d) Turn the power switch off.

The waveform differs from the one shown in the illustration.

GO TO STEP 6

The waveform appears as shown in the illustration.

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

(e) Turn the power switch off.

P3107-213 is output.

REPLACE HYBRID VEHICLE CONTROL ECU

P3107-213 is not output.

5.

CHECK FOR INTERMITTENT PROBLEMS

Click here

OK

REPLACE HYBRID VEHICLE CONTROL ECU

NG

REPAIR OR REPLACE MALFUNCTIONING PARTS, COMPONENT AND AREA

6.

CHECK AIRBAG ECU ASSEMBLY

(a) Disconnect the I58 airbag ECU assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

I58-14 (GSW2) - I58-25 (E1)

Power switch off

10 kΩ or higher

*a

Component without harness connected

(Airbag ECU Assembly)

(c) Reconnect the I58 airbag ECU assembly connector.

NG

REPLACE AIRBAG ECU ASSEMBLY

OK

7.

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

(a) Disconnect the I116 hybrid vehicle control ECU connector.

(b) Disconnect the I58 airbag ECU assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

I116-14 (ABFS) or I58-14 (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

Rear view of wire harness connector

(to Airbag ECU Assembly)

(d) Reconnect the I58 airbag ECU assembly connector.

(e) Reconnect the I116 hybrid vehicle control ECU connector.

OK

REPLACE HYBRID VEHICLE CONTROL ECU

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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