Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: Emergency Call Switch Illumination Circuit
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
-
Depending on the parts that are replaced during vehicle inspection or maintenance, performing initialization, registration or calibration may be needed. Refer to Precaution for Safety Connect System.
Click here
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- Inspect the fuses for circuits related to this system before performing the following procedure.
PROCEDURE
| 1. | CHECK HARNESS AND CONNECTOR (MAP LIGHT ASSEMBLY (MANUAL (SOS) SWITCH) POWER SOURCE) |
(a) Disconnect the J157 DCM (telematics transceiver) connector.
(b) Disconnect the U12 map light assembly (manual (SOS) switch) connector.
(c) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
| Tester Connection | Switch Condition | Specified Condition |
|---|---|---|
| U12-5 (RRID) - Body Ground | Engine switch on (IG) | 11 to 14 V |
(d) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| J157-3 (SIG-) - U12-9 (GND3) | Always | Below 1 Ω |
| J157-3 (SIG-) or U12-9 (GND3) - Body ground | Always | 10 kΩ or higher |
| NG | .gif) | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
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| 2. | INSPECT MAP LIGHT ASSEMBLY (MANUAL (SOS) SWITCH) |
| (a) Remove the map light assembly (manual (SOS) switch). Click here |
|
(b) Apply battery voltage to the connector and check that the roof console box assembly comes on.
OK:
| Measurement Condition | Condition | Specified Condition |
|---|---|---|
| Battery positive (+) → U12-5 (RRID) Battery negative (-) → U12-9 (GND3) | Always | Manual (SOS) switch illumination cones on |
| NG | | REPLACE MAP LIGHT ASSEMBLY (MANUAL (SOS) SWITCH) |
|
| 3. | REPLACE DCM (TELEMATICS TRANSCEIVER) |
(a) Replace the DCM (telematics transceiver) with a new one.
Click here
NOTICE:
- The engine switch must be off.
- Do not exchange the DCM (telematics transceiver) with one from another vehicle.
| NEXT | | PERFORM DCM ACTIVATION |
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Lexus RX (RX 350L, RX450h) 2016-{YEAR} Owners Manual
- For your information
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- Instrument cluster
- Operation of each component
- Driving
- Lexus Display Audio system
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- When trouble arises
- Vehicle specifications
- For owners
Lexus RX (RX 350L, RX450h) 2016-{YEAR} Repair Manual
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