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 |
