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 |
---|---|---|---|
B15C464 | Airbag Signal Signal Plausibility Failure | DCM (telematics transceiver) detects an error in signals from airbag sensor assembly when engine switch is on (IG). |
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WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
Click here
Click here
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 |
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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 |
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3. | CHECK DCM (TELEMATICS TRANSCEIVER) (GSW SIGNAL) |
(a) Remove the DCM (telematics transceiver) but do not disconnect the connectors. Click here |
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(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 sensor assembly connectors are connected.)
Reference Waveform:
Item | Condition |
---|---|
Tester connection | J157-13 (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 |
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4. | REPLACE DCM (TELEMATICS TRANSCEIVER) |
(a) Replace the DCM (telematics transceiver).
Click here
NOTICE:
NEXT | ![]() | PERFORM DCM ACTIVATION |
5. | CHECK HARNESS AND CONNECTOR (DCM [TELEMATICS TRANSCEIVER] - AIRBAG SENSOR ASSEMBLY) |
(a) Disconnect the J157 DCM (telematics transceiver) connector.
(b) Disconnect the J142 airbag sensor assembly connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection | Condition | Specified Condition |
---|---|---|
J157-13 (GSW) - J142-22 (GSW3) | Always | Below 1 Ω |
J157-13 (GSW) - Body ground | Always | 10 kΩ or higher |
OK | ![]() | REPLACE AIRBAG SENSOR ASSEMBLY |
NG | ![]() | REPAIR OR REPLACE HARNESS OR CONNECTOR |
Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual > Navigation System: Start Up Signal Circuit between Radio Receiver Assembly and Navigation ECU
DESCRIPTION This circuit includes the navigation ECU and radio receiver assembly. WIRING DIAGRAM PROCEDURE 1. CHECK HARNESS AND CONNECTOR (RADIO RECEIVER ASSEMBLY - NAVIGATION ECU) (a) Disconnect the J149 radio receiver assembly connector. (b) Disconnect the J153 navigation ECU connector. ...
Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual > Immobiliser System: How To Proceed With Troubleshooting
CAUTION / NOTICE / HINT HINT:
Use this procedure to troubleshoot the immobiliser system.
*: Use the Techstream.
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NEXT 2. CUSTOMER PROBLEM ANALYSIS HINT:
In troubleshooting, confirm that the problem symptoms have be ...