DTC B15C5-11: Emergency Call Switch Circuit Short to Ground; DTC B15C5-13: Emergency Call Switch Circuit Open [10/2019 - ]: Procedure
WARNING: This page does not describe the selected car, but rather 10 other vehicles, including the 2024 Lexus ES 350, 2024 Lexus ES 250, 2023 Lexus ES 350, 2023 Lexus ES 250, and 2022 Lexus ES 350. However, it is still accessible from the selected car via links, so may be relevant.
- CHECK DTC
- Turn the engine switch off.
- Connect the Techstream to the DLC3.
- Turn the engine switch on (IG) and wait for 10 seconds or more.
- Turn the Techstream on.
- Clear the DTCs.
Body Electrical > Telematics > Clear DTCs
- Check for DTCs and check that no DTCs are output.
Body Electrical > Telematics > Trouble Codes
OK
No DTCs are output.
Result
Proceed to OK NG
Result:
OK
USE SIMULATION METHOD TO CHECK. Refer to HOW TO PROCEED WITH TROUBLESHOOTING [06/2018 - ]
Result:
NG
See step 2
- INSPECT MAP LIGHT SUB-ASSEMBLY (MANUAL (SOS) SWITCH)
- Remove the map light sub-assembly (manual (SOS) switch).
*a Component without harness connected
(Map light sub-assembly (Manual (SOS) Switch))Refer to REMOVAL [06/2018 - ]
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition 13 (SIG1) - 9 (GND3) Manual (SOS) switch not operated 410 to 414 Ω 13 (SIG1) - 9 (GND3) Manual (SOS) switch operated 81 to 83 Ω Result
Proceed to OK NG
Result:
NG
REPLACE MAP LIGHT SUB-ASSEMBLY (MANUAL (SOS) SWITCH). Refer to REMOVAL [06/2018 - ]
Result:
OK
See step 3
- Remove the map light sub-assembly (manual (SOS) switch).
- CHECK HARNESS AND CONNECTOR (DCM (TELEMATICS TRANSCEIVER) - MAP LIGHT SUB-ASSEMBLY (MANUAL (SOS) SWITCH))
- Disconnect the G128 DCM (telematics transceiver) connector.
- Disconnect the P12 map light sub-assembly (manual (SOS) switch) connector.
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition G128-21 (SIG1) - P12-13 (SIG1) Always Below 1 Ω G128-3 (SIG-) - P12-9 (GND3) Always Below 1 Ω G128-21 (SIG1) or P12-13 (SIG1) - Body ground Always 10 kΩ or higher G128-3 (SIG-) or P12-9 (GND3) - Body ground Always 10 kΩ or higher Result
Proceed to OK NG
Result:
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
Result:
OK
See step 4
- REPLACE DCM (TELEMATICS TRANSCEIVER)
- Replace the DCM (telematics transceiver) with a new one.
Refer to REMOVAL [10/2019 - 08/2020] , or refer to REMOVAL [08/2020 - 09/2022] , or refer to REMOVAL [09/2022 - ]
NOTE:- The engine switch must be off.
- Do not exchange the DCM (telematics transceiver) with one from another vehicle.
Result
Proceed to NEXT
Result:
NEXT
PERFORM DCM ACTIVATION. Refer to DCM ACTIVATION [10/2019 - ]
- Replace the DCM (telematics transceiver) with a new one.