Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: Telephone Sub Antenna Circuit Short to Ground (B153711,B153713)

Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual / Audio & Visual & Telematics / Cellular Communication / Safety Connect System / Telephone Sub Antenna Circuit Short to Ground (B153711,B153713)

DESCRIPTION

These DTCs are stored when a malfunction occurs in the telephone and GPS antenna (for Front Side).

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

B153711

Telephone Sub Antenna Circuit Short to Ground

Telephone antenna (sub) impedance (Ω) is lower than the malfunction threshold for 10 seconds or more when the engine switch is on (IG)

(Short circuit)
  • DCM (telematics transceiver)
  • Telephone and GPS antenna (for Front Side)
  • Telephone and GPS antenna cord (antenna cord sub-assembly)

B153713

Telephone Sub Antenna Circuit Open

Telephone antenna (sub) impedance (Ω) is higher than the malfunction threshold for 10 seconds or more when the engine switch is on (IG)

(Open circuit)
  • DCM (telematics transceiver)
  • Telephone and GPS antenna (for Front Side)
  • Telephone and GPS antenna cord (antenna cord sub-assembly)

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

HINT:

Refer to "PARTS LOCATION" for the installation location of telephone and GPS antenna cord.

Click here

PROCEDURE

1.

CHECK DTC

(a) Turn the engine switch off.

(b) Connect the Techstream to the DLC3.

(c) Turn the engine 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 TELEPHONE AND GPS ANTENNA (FOR FRONT SIDE)

(a) Remove the telephone and GPS antenna (for Front Side).

Click here

(b) Inspect the telephone and GPS antenna (for Front Side).

Click here

NG

REPLACE TELEPHONE AND GPS ANTENNA (FOR FRONT SIDE)

OK

3.

INSPECT TELEPHONE AND GPS ANTENNA CORD (ANTENNA CORD SUB-ASSEMBLY)

(a) Disconnect the antenna connector from the telephone and GPS antenna (for Front Side).

*a

Component without harness connected

(to Telephone and GPS Antenna [for Front Side])

(b) Disconnect the antenna connector from the DCM (telematics transceiver).

*a

Component without harness connected

(to DCM [Telematics Transceiver])

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A-1 (TEL SUB) - D-4

Always

Below 1 Ω

A-1a (GND) - D-4a

Always

Below 1 Ω

A-1 (TEL SUB) or D-4 - Body ground

Always

10 kΩ or higher
NG

REPLACE TELEPHONE AND GPS ANTENNA CORD (ANTENNA CORD SUB-ASSEMBLY)

OK

4.

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

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