Lexus NX: Telephone Main Antenna Circuit Short to Ground (B15CB11,B15CB13)

Lexus NX Service Manual / Audio & Visual & Telematics / Cellular Communication / Safety Connect System / 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 and GPS antenna (roof antenna assembly) 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 malfunction criterion for 10 seconds when power switch is on (IG).

(Short circuit)

  • DCM (telematics transceiver)
  • Telephone and GPS antenna (roof antenna assembly)
  • Telephone and GPS antenna cord (No. 4 antenna cord sub-assembly)
  • Telephone and GPS antenna cord (No. 2 antenna cord sub-assembly)
  • Telephone and GPS antenna cord (No. 1 antenna cord sub-assembly)

B15CB13

Telephone Main Antenna Circuit Open

Telephone antenna (main) impedance (Ω) is higher than malfunction criterion for 10 seconds when power switch is on (IG).

(Open circuit)

  • DCM (telematics transceiver)
  • Telephone and GPS antenna (roof antenna assembly)
  • Telephone and GPS antenna cord (No. 4 antenna cord sub-assembly)
  • Telephone and GPS antenna cord (No. 2 antenna cord sub-assembly)
  • Telephone and GPS antenna cord (No. 1 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 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) Check for DTCs and check that no DTCs are output.

Click here

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. 4 ANTENNA CORD SUB-ASSEMBLY)

(a) Disconnect the antenna connector from the roof antenna assembly.

*a

Front view of wire harness connector

(to Roof Antenna Assembly)

*b

Front view of wire harness connector

(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 - Body ground

Always

10 kΩ or higher

NG

REPLACE TELEPHONE AND GPS ANTENNA CORD (NO. 4 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. 4 antenna cord sub-assembly.

*a

Front view of wire harness connector

(to No. 4 Antenna Cord Sub-assembly)

*b

Front view of wire harness connector

(to No. 1 Antenna Cord Sub-assembly)

(b) Disconnect the antenna connector from the No. 1 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 - 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 (NO. 1 ANTENNA CORD SUB-ASSEMBLY)

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

*a

Front view of wire harness connector

(to No. 2 Antenna Cord Sub-assembly)

*b

Front view of wire harness connector

(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 - TEL-1 (ANT1)

Always

Below 1 Ω

C-1a - TEL-1a

Always

Below 1 Ω

C-1 - Body ground

Always

10 kΩ or higher

NG

REPLACE TELEPHONE AND GPS ANTENNA CORD (NO. 1 ANTENNA CORD SUB-ASSEMBLY)

OK

5.

CHECK TELEPHONE AND GPS ANTENNA (ROOF ANTENNA ASSEMBLY)

(a) Replace the telephone and GPS antenna (roof antenna assembly) with a known good one.

Click here

(b) Clear the DTCs.

Click here

Body Electrical > Telematics > Clear DTCs

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

Click here

Body Electrical > Telematics > Trouble Codes

OK:

No DTCs are output.

OK

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

NG

6.

REPLACE DCM (TELEMATICS TRANSCEIVER)

(a) Replace the DCM (telematics transceiver).

Click here

NOTICE:

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