Lexus ES manuals

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

Power 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

OK

2.

INSPECT MAP LIGHT SUB-ASSEMBLY (MANUAL (SOS) SWITCH)

(a) Remove the map light sub-assembly (manual (SOS) switch).

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*a

Component without harness connected

(Map light sub-assembly (Manual (SOS) Switch))

(b) Apply auxiliary battery voltage to the connector and check that the manual (SOS) switch illumination comes on.

OK:

Measurement Condition

Condition

Specified Condition

Auxiliary battery positive (+) → P12-5 (RRID)

Auxiliary battery negative (-) → P12-9 (GND3)

Always

Manual (SOS) switch illumination cones on

NG

REPLACE MAP LIGHT SUB-ASSEMBLY (MANUAL (SOS) SWITCH)

OK

3.

REPLACE DCM (TELEMATICS TRANSCEIVER)

(a) Replace the DCM (telematics transceiver) with a new one.

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NOTICE:

  • The power switch must be off.
  • Do not exchange the DCM (telematics transceiver) with one from another vehicle.
NEXT

PERFORM DCM ACTIVATION

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