Lexus RX (RX 350L, RX450h) 2016-2026 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 |
Unable To Connect To Call Center
DESCRIPTION This may occur when the intensity of telephone radio frequency was very weak, or the safety connect system has a malfunction and a DTC is set. PROCEDURE 1. CHECK COMMUNICATION SERVIC ...
Other materials:
Lexus RX (RX 350L, RX450h) 2016-2026 Repair Manual > Front Radar Sensor System: Problem Symptoms Table
PROBLEM SYMPTOMS TABLE HINT:
Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are listed in order of probability in the "Suspected Area" column of the table. Check each symptom by checking the suspect ...
Lexus RX (RX 350L, RX450h) 2016-2026 Owners Manual > Do-it-yourself
maintenance: Checking and replacing
fuses
If any of the electrical components do not operate, a fuse may have
blown. If
this happens, check and replace the fuses as necessary.
1. Turn the power switch off.
2. Open the fuse box cover.
■ Engine compartment
Push the tab in and lift the lid off.
■ Driver's side instrument panel
R ...
Lexus RX (RX 350L, RX450h) 2016-{YEAR} Owners Manual
- For your information
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- Instrument cluster
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- Driving
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- When trouble arises
- Vehicle specifications
- For owners
Lexus RX (RX 350L, RX450h) 2016-{YEAR} Repair Manual
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