Lexus ES: 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 set.
| 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 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.
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-
After turning the engine switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notices before proceeding with work.
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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 or more.
(d) Turn the Techstream on.
(e) Clear the DTCs.
Body Electrical > SRS Airbag > Clear DTCs(f) Check for DTCs and check that no DTCs are output.
Body Electrical > SRS Airbag > Trouble CodesOK:
No DTCs are output.
| NG |  | GO TO AIRBAG SYSTEM |
|
| 2. | CHECK DTC |
(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 or more.
(d) Turn the Techstream on.
(e) Clear the DTCs.
Body Electrical > Telematics > Clear DTCs(f) Check for DTCs and check that no DTCs are output.
Body Electrical > Telematics > Trouble CodesOK:
No DTCs are output.
| OK | | USE SIMULATION METHOD TO CHECK |
|
| 3. | CHECK DCM (TELEMATICS TRANSCEIVER) (GSW SIGNAL) |
| (a) Remove the DCM (telematics transceiver) but do not disconnect the connectors. Click here |
|
(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 | G128-13 (GSW) - Body ground |
| Tool setting | 5.0 V/DIV., 20 ms/DIV. |
| Vehicle condition | Engine switch on (IG) |
OK:
The waveform is similar to that shown in the illustration.
| NG | | GO TO STEP 5 |
|
| 4. | REPLACE DCM (TELEMATICS TRANSCEIVER) |
(a) Replace the DCM (telematics transceiver).
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NOTICE:
- The engine 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 G128 DCM (telematics transceiver) connector.
(b) Disconnect the G64 airbag ECU assembly connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| G128-13 (GSW) - G64-23 (GSW3) | Always | Below 1 Ω |
| G128-13 (GSW) or G64-23 (GSW3) - Body ground | Always | 10 kΩ or higher |
| OK | | REPLACE AIRBAG ECU ASSEMBLY |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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