Toyota CH-R Service Manual: 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. |
|
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
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PROCEDURE
|
1. |
CHECK DTC (AIRBAG SYSTEM) |
(a) Turn the ignition switch off.
(b) Connect the Techstream to the DLC3.
(c) Turn the ignition switch ON and wait for 10 seconds.
(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 |
| B | .gif) |
GO TO AIRBAG SYSTEM |
|
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|
2. |
INSPECT DCM (TELEMATICS TRANSCEIVER) (GSW SIGNAL) |
|
(a) Remove the DCM (Telematics Transceiver) but do not disconnect the connectors. Click here
|
|
(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 |
| B | |
GO TO STEP 4 |
| C | |
GO TO STEP 5 |
|
|
3. |
CHECK HARNESS AND CONNECTOR (FOR OPEN CIRCUIT) |
(a) Remove the airbag sensor assembly but do not disconnect the connectors.
Click here
|
(b) Measure the voltage according to the value(s) in the table below. Standard Voltage:
Reference Waveform:
|
|
| OK | |
REPLACE AIRBAG SENSOR ASSEMBLY |
| NG | |
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 |
| NG | |
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.
| NEXT | |
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.
(c) Measure the resistance according to the value(s) in the table below.
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 |
| OK | |
REPLACE AIRBAG SENSOR ASSEMBLY |
| NG | |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
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DESCRIPTION
This DTC is set when the DCM (Telematics Transceiver) detects an open or short
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DESCRIPTION
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DTC No.
Detection Item
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1.
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