| Last Modified: 05-13-2024 | 6.11:8.1.0 | Doc ID: RM100000001LF5Q |
| Model Year Start: 2020 | Model: GR Corolla | Prod Date Range: [09/2019 - 04/2020] |
| Title: CELLULAR COMMUNICATION: SAFETY CONNECT SYSTEM (for Sedan, Gasoline Model): B15C4; Airbag Signal Malfunction/Not Input; 2020 MY Corolla Corolla Hatchback GR Corolla [09/2019 - 04/2020] | ||
|
DTC |
B15C4 |
Airbag Signal Malfunction/Not Input |
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 engine switch is on (IG). |
|
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
![2020 MY Corolla Corolla Hatchback GR Corolla [01/2019 - 04/2020]; SUPPLEMENTAL RESTRAINT SYSTEMS: AIRBAG SYSTEM (for TMC Made Gasoline Model): PRECAUTION](/t3Portal/stylegraphics/info.gif)
PROCEDURE
|
1. |
CHECK DTC (AIRBAG SYSTEM) |
(a) Turn the engine switch off.
(b) Connect the Techstream to the DLC3.
(c) Turn the engine switch on (IG) 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 |
|
|
|
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 |
Condition |
Specified Condition |
|---|---|---|
|
I72-24 (GSW) - Body ground |
Engine switch on (IG) |
6.5 to 8.5 V |
Reference Waveform:
|
Item |
Condition |
|---|---|
|
Tester connection |
I72-24 (GSW) - Body ground |
|
Tool setting |
5.0 V/DIV., 20 ms/DIV. |
|
Vehicle condition |
Engine switch on (IG) |
|
Result |
Proceed to |
|---|---|
|
8.5 V or higher |
A |
|
Below 6.5 V |
B |
|
6.5 to 8.5 V |
C |
| B |
|
| C |
|
|
|
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 |
|
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
4. |
CHECK HARNESS AND CONNECTOR (FOR SHORT CIRCUIT) |
(a) Disconnect the I72 DCM (Telematics Transceiver) connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
I72-24 (GSW) - Body ground |
Always |
10 kΩ or higher |
|
I47-23 (GSW3) - Body ground |
Always |
10 kΩ or higher |
| NG |
|
|
|
5. |
REPLACE DCM (TELEMATICS TRANSCEIVER) |
(a) Replace the DCM (Telematics Transceiver).
Click here
NOTICE:
- The engine switch must be off.
- Do not swap the DCM (Telematics Transceiver) with one from another vehicle.
| NEXT |
|
|
6. |
CHECK HARNESS AND CONNECTOR (DCM (TELEMATICS TRANSCEIVER) - AIRBAG ECU ASSEMBLY) |
(a) Disconnect the I72 DCM (Telematics Transceiver) connector.
(b) Disconnect the I47 airbag sensor assembly connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
I72-24 (GSW) - I47-23 (GSW3) |
Always |
Below 1 Ω |
|
I72-24 (GSW) or I47-23 (GSW3) - Body ground |
Always |
10 kΩ or higher |
| OK |
|
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|