Toyota CH-R Service Manual: Airbag Signal Malfunction/Not Input (B15C4)

Toyota CH-R Service Manual / Cellular Communication / Safety Connect System / Airbag Signal Malfunction/Not Input (B15C4)

DESCRIPTION

If the DCM (Telematics Transceiver) detects an error in communication between the DCM (Telematics Transceiver) and the airbag sensor assembly as a result of the DCM (Telematics Transceiver) self check, this DTC will be set.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area
B15C4	Airbag Signal Malfunction/Not Input	DCM (Telematics Transceiver) detects an error in signals from airbag sensor assembly when ignition switch is ON.	Airbag system Wire harness or connector Airbag sensor 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.

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PROCEDURE

1.	CHECK DTC (AIRBAG SYSTEM)

(a) Turn the ignition switch off.

(b) Connect the Techstream to the DLC3.

(d) Turn the Techstream on.

(e) Clear the DTCs.

Body Electrical > SRS Airbag > Clear DTCs

(f) Recheck for DTCs.

Body Electrical > SRS Airbag > Trouble Codes

Result	Proceed to
DTCs are not output	A
DTCs are output	B

GO TO AIRBAG SYSTEM

2.	INSPECT DCM (TELEMATICS TRANSCEIVER) (GSW SIGNAL)

(a) Remove the DCM (Telematics Transceiver) but do not disconnect the connectors.

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*a	Component with harness connected (DCM (Telematics Transceiver))

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

Standard Voltage:

Tester Connection	Switch Condition	Specified Condition
F134-24 (GSW) - Body ground	Ignition switch ON	6.5 to 8.5 V

Reference Waveform:

Item	Condition
Tester connection	F134-24 (GSW) - Body ground
Tool setting	5.0 V/DIV., 20 ms/DIV.
Vehicle condition	Ignition switch ON

Result	Proceed to
8.5 V or higher	A
Below 6.5 V	B
6.5 to 8.5 V	C

GO TO STEP 4

GO TO STEP 5

3.	CHECK HARNESS AND CONNECTOR (FOR OPEN CIRCUIT)

(a) Remove the airbag sensor assembly but do not disconnect the connectors.

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

Standard Voltage:

Tester Connection	Switch Condition	Specified Condition
F70-24 (GSW3) - Body ground	Ignition switch ON	8.5 V or higher

Reference Waveform:

Item	Condition
Tester connection	F70-24 (GSW3) - Body ground
Tool setting	5.0 V/DIV., 20 ms/DIV.
Vehicle condition	Ignition switch ON

*a	Component with harness connected (Airbag Sensor Assembly)

REPLACE AIRBAG SENSOR ASSEMBLY

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.	CHECK HARNESS AND CONNECTOR (FOR SHORT CIRCUIT)

(a) Disconnect the F134 DCM (Telematics Transceiver) connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
F134-24 (GSW) - Body ground	Always	10 kΩ or higher
F70-24 (GSW3) - Body ground	Always	10 kΩ or higher

GO TO STEP 6

5.	REPLACE DCM (TELEMATICS TRANSCEIVER)

(a) Replace the DCM (Telematics Transceiver).

Click here

NOTICE:

The ignition switch must be off.
Do not swap the DCM (Telematics Transceiver) with one from another vehicle.

PERFORM DCM ACTIVATION

6.	CHECK HARNESS AND CONNECTOR (DCM (TELEMATICS TRANSCEIVER) - AIRBAG SENSOR ASSEMBLY)

(a) Disconnect the F134 DCM (Telematics Transceiver) connector.

(b) Disconnect the F70 airbag sensor assembly connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
F134-24 (GSW) - F70-24 (GSW3)	Always	Below 1 Ω
F134-24 (GSW) or F70-24 (GSW3) - Body ground	Always	10 kΩ or higher

REPLACE AIRBAG SENSOR ASSEMBLY

REPAIR OR REPLACE HARNESS OR CONNECTOR

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