Toyota Corolla Cross Owners & Service Manuals

Toyota Corolla Cross: Airbag Signal Signal Plausibility Failure (B15C464)

DESCRIPTION

If the DCM (telematics transceiver) detects an error in communication between the DCM (telematics transceiver) and the airbag ECU assembly as a result of the DCM (telematics transceiver) self check, this DTC will be stored.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

B15C464

Airbag Signal Signal Plausibility Failure

DCM (telematics transceiver) detects an error in signals from airbag ECU assembly when ignition switch is ON.

  • Airbag system
  • Harness or connector
  • Airbag ECU assembly
  • DCM (telematics transceiver)

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • The vehicle is equipped with an SRS (Supplemental Restraint System) which includes components such as airbags. Before servicing (including removal or installation of parts), be sure to read the Precaution in the SRS.

    Click here

  • After turning the ignition switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal.

    Click here

HINT:

When disconnecting and reconnecting the auxiliary battery, there is an automatic learning function that completes learning when the respective system is used.

Click here

PROCEDURE

1.

CHECK DTC (AIRBAG SYSTEM)

(a) Turn the ignition switch to ON and wait for 10 seconds or more.

(b) Clear the DTCs.

(c) Check for DTCs and check that no DTCs are output.

OK:

No DTCs are output.

NG

GO TO AIRBAG SYSTEM

OK

2.

CHECK DTC

(a) Turn the ignition switch to ON and wait for 10 seconds or more.

(b) Clear the DTCs.

Body Electrical > Telematics > Clear DTCs

(c) Check for DTCs and check that no DTCs are output.

Body Electrical > Telematics > Trouble Codes

OK:

No DTCs are output.

OK

USE SIMULATION METHOD TO CHECK

NG

3.

CHECK DCM (TELEMATICS TRANSCEIVER) (GSW SIGNAL)

(a) Remove the DCM (telematics transceiver) but do not disconnect the connectors.

Click here

*a

Component with harness connected

(DCM [Telematics Transceiver])

(b) Check the input waveform.

(1) Check the signal waveform according to the condition(s) in the table below. (Check the waveform from the back of the wire harness connector of the DCM (telematics transceiver) while the airbag ECU assembly connectors are connected.)

Reference Waveform:

Item

Condition

Tester connection

I200-13 (GSW) - Body ground

Tool setting

5.0 V/DIV., 20 ms./DIV.

Vehicle condition

Ignition switch ON

OK:

The waveform is similar to that shown in the illustration.

NG

GO TO STEP 5

OK

4.

REPLACE DCM (TELEMATICS TRANSCEIVER)

(a) Replace the DCM (telematics transceiver) with a new one.

Click here

NOTICE:

  • The ignition switch must be off.
  • Do not exchange the DCM (telematics transceiver) with one from another vehicle.
NEXT

PERFORM DCM ACTIVATION

5.

CHECK HARNESS AND CONNECTOR (DCM [TELEMATICS TRANSCEIVER] - AIRBAG ECU ASSEMBLY)

(a) Disconnect the I200 DCM (telematics transceiver) connector.

(b) Disconnect the I47 airbag ECU assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

I200-13 (GSW) - I47-23 (GSW3)

Always

Below 1 Ω

I200-13 (GSW) - Body ground

Always

10 kΩ or higher

OK

REPLACE AIRBAG ECU ASSEMBLY

NG

REPLACE HARNESS OR CONNECTOR

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