Lexus ES manuals

Lexus ES: Emergency Call Switch Circuit Short to Ground (B15C511,B15C513)

DESCRIPTION

If the DCM (telematics transceiver) detects an error in the communication between the DCM (telematics transceiver) and the map light sub-assembly (manual (SOS) switch) as a result of the DCM (telematics transceiver) self check, this DTC will be stored.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

B15C511

Emergency Call Switch Circuit Short to Ground

Manual (SOS) switch impedance (Ω) is lower than the malfunction threshold for 10 seconds or more when the power switch is on (IG)

  • Map light sub-assembly (manual (SOS) switch)
  • Harness or connector
  • DCM (telematics transceiver)

B15C513

Emergency Call Switch Circuit Open

Manual (SOS) switch impedance (Ω) is higher than the malfunction threshold for 10 seconds or more when the power switch is on (IG)

  • Map light sub-assembly (manual (SOS) switch)
  • Harness or connector
  • DCM (telematics transceiver)

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

PROCEDURE

1.

CHECK DTC

(a) Turn the power switch off.

(b) Connect the Techstream to the DLC3.

(c) Turn the power switch on (IG) and wait for 10 seconds or more.

(d) Turn the Techstream on.

(e) Clear the DTCs.

Body Electrical > Telematics > Clear DTCs

(f) Check for DTCs and check that no DTCs are output.

Body Electrical > Telematics > Trouble Codes

OK:

No DTCs are output.

OK

USE SIMULATION METHOD TO CHECK

NG

2.

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

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

Click here

*a

Component without harness connected

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

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

13 (SIG1) - 9 (GND3)

Manual (SOS) switch not operated

410 to 414 Ω

13 (SIG1) - 9 (GND3)

Manual (SOS) switch operated

81 to 83 Ω

NG

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

OK

3.

CHECK HARNESS AND CONNECTOR (DCM (TELEMATICS TRANSCEIVER) - MAP LIGHT SUB-ASSEMBLY (MANUAL (SOS) SWITCH))

(a) Disconnect the G128 DCM (telematics transceiver) connector.

(b) Disconnect the P12 map light sub-assembly (manual (SOS) switch) connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

G128-21 (SIG1) - P12-13 (SIG1)

Always

Below 1 Ω

G128-3 (SIG-) - P12-9 (GND3)

Always

Below 1 Ω

G128-21 (SIG1) or P12-13 (SIG1) - Body ground

Always

10 kΩ or higher

G128-3 (SIG-) or P12-9 (GND3) - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

4.

REPLACE DCM (TELEMATICS TRANSCEIVER)

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

Click here

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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 Dtc Check / Clear

DTC CHECK / CLEAR CHECK DTC (a) Connect the Techstream to the DLC3. (b) Turn the engine switch on (IG). (c) Turn the Techstream on. (d) Enter the following menus: Body Electrical / Back Door / Trouble Codes. Body Electrical > Back Door > Trouble Codes (e) Check for DTCs. Click here CLEAR DTC

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