Lexus ES: 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.
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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 SUB-ASSEMBLY (MANUAL (SOS) SWITCH) POWER SOURCE) |
(a) Disconnect the G128 DCM (telematics transceiver) connector.
(b) Disconnect the P12 map light sub-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 |
|---|---|---|
| P12-5 (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 |
|---|---|---|
| G128-3 (SIG-) - P12-9 (GND3) | Always | Below 1 Ω |
| G128-3 (SIG-) or P12-9 (GND3) - Body ground | Always | 10 kΩ or higher |
| NG |  | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
| 2. | INSPECT MAP LIGHT SUB-ASSEMBLY (MANUAL (SOS) SWITCH) |
| (a) Remove the map light sub-assembly (manual (SOS) switch). Click here |
|
(b) Apply battery voltage to the connector and check that the manual (SOS) switch illumination comes on.
OK:
| Measurement Condition | Condition | Specified Condition |
|---|---|---|
| Battery positive (+) → P12-5 (RRID) Battery negative (-) → P12-9 (GND3) | Always | Manual (SOS) switch illumination cones on |
| NG | | REPLACE MAP LIGHT SUB-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 |
READ NEXT:
Green Indicator Remains Off
DESCRIPTION After engine switch on (IG), the DCM (telematics transceiver) will enter into self check mode. The manual (SOS) switch red indicator will illuminate for 2 seconds and turn off followed by
How To Proceed With Troubleshooting
CAUTION / NOTICE / HINT HINT:
Use the following procedure to troubleshoot the safety connect system.
*: Use the Techstream.
PROCEDURE 1. VEHICLE BROUGHT TO WORKSHOP
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Data List / Active Test
DATA LIST / ACTIVE TEST DATA LIST NOTICE:
Some Data List values may vary significantly if there are slight differences in the environment in which the vehicle is operating when measurements are obtained. Variations may also occur due to aging of the vehicle. Due to these considerations, it is not
