Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual: Telephone Main Antenna Circuit Short to Ground (B15CB11,B15CB13)

DESCRIPTION

This DTC is stored when the DCM (telematics transceiver) detects an open or a short in the telephone antenna (main) circuit.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

B15CB11

Telephone Main Antenna Circuit Short to Ground

Telephone antenna (main) 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 Roof Side)
  • Telephone and GPS antenna cord (No. 6 antenna cord sub-assembly)
  • Telephone and GPS antenna cord (No. 2 antenna cord sub-assembly)
  • Telephone and GPS antenna cord (antenna cord sub-assembly)

B15CB13

Telephone Main Antenna Circuit Open

Telephone antenna (main) 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 Roof Side)
  • Telephone and GPS antenna cord (No. 6 antenna cord sub-assembly)
  • Telephone and GPS antenna cord (No. 2 antenna cord sub-assembly)
  • 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

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 CORD (NO. 6 ANTENNA CORD SUB-ASSEMBLY)

(a) Disconnect the antenna connector from the Telephone and GPS antenna (for Roof Side).

*a

Component without harness connected

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

*b

Component without harness connected

(to No. 2 Antenna Cord Sub-assembly)

(b) Disconnect the antenna connector from the No. 2 antenna cord sub-assembly.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A-4 - B-1

Always

Below 1 Ω

A-4a - B-1a

Always

Below 1 Ω

A-4 or B-1 - Body ground

Always

10 kΩ or higher

NG

REPLACE TELEPHONE AND GPS ANTENNA CORD (NO. 6 ANTENNA CORD SUB-ASSEMBLY)

OK

3.

INSPECT TELEPHONE AND GPS ANTENNA CORD (NO. 2 ANTENNA CORD SUB-ASSEMBLY)

(a) Disconnect the antenna connector from the No. 6 antenna cord sub-assembly.

*a

Component without harness connected

(to No. 6 Antenna Cord Sub-assembly)

*b

Component without harness connected

(to Antenna Cord Sub-assembly)

(b) Disconnect the antenna connector from the antenna cord sub-assembly.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

B-1 - C-1

Always

Below 1 Ω

B-1a - C-1a

Always

Below 1 Ω

B-1 or C-1 - Body ground

Always

10 kΩ or higher

NG

REPLACE TELEPHONE AND GPS ANTENNA CORD (NO. 2 ANTENNA CORD SUB-ASSEMBLY)

OK

4.

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

(a) Disconnect the antenna connector from the No. 2 antenna cord sub-assembly.

*a

Component without harness connected

(to No. 2 Antenna Cord Sub-assembly)

*b

Component without harness connected

(to DCM [Telematics Transceiver])

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

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

C-1 - D-1 (TEL MAIN)

Always

Below 1 Ω

C-1a - D-1a (GND)

Always

Below 1 Ω

C-1 or D-1 (TEL MAIN) - Body ground

Always

10 kΩ or higher

NG

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

OK

5.

CHECK TELEPHONE AND GPS ANTENNA (for Roof Side)

(a) Replace the telephone and GPS antenna (for Roof Side) with a known good one.

Click here

(b) Clear the DTCs.

Body Electrical > Telematics > Clear DTCs

(c) Recheck for DTCs and check that no DTCs are output.

Body Electrical > Telematics > Trouble Codes

OK:

No DTCs are output.

OK

END (TELEPHONE AND GPS ANTENNA [FOR ROOF SIDE] IS DEFECTIVE)

NG

6.

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.
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