Lexus NX: Telephone Sub Antenna Circuit Short to Ground (B153711,B153713)

Lexus NX Service 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 antenna (navigation antenna assembly)

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 power switch is on (IG).

(Short circuit)

  • DCM (telematics transceiver)
  • Telephone antenna (navigation antenna assembly)
  • Telephone 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 power switch is on (IG).

(Open circuit)

  • DCM (telematics transceiver)
  • Telephone antenna (navigation antenna assembly)
  • Telephone 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.

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HINT:

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

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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 ANTENNA (NAVIGATION ANTENNA ASSEMBLY)

(a) Remove the telephone antenna (navigation antenna assembly).

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(b) Inspect the telephone antenna (navigation antenna assembly).

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NG

REPLACE TELEPHONE ANTENNA (NAVIGATION ANTENNA ASSEMBLY)

OK

3.

INSPECT TELEPHONE ANTENNA CORD (ANTENNA CORD SUB-ASSEMBLY)

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

*a

Front view of wire harness connector

(to Navigation Antenna Assembly)

*b

Front view of wire harness connector

(to Wire Harness)

(b) Disconnect the antenna connector from the wire harness.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A-4 - I169-4 (TEL)

Always

Below 1 Ω

A-4a - I169-4a

Always

Below 1 Ω

A-4 - Body ground

Always

10 kΩ or higher

NG

REPLACE TELEPHONE ANTENNA CORD (ANTENNA CORD SUB-ASSEMBLY)

OK

4.

CHECK HARNESS AND CONNECTOR (ANTENNA CORD SUB-ASSEMBLY - DCM [TELEMATICS TRANSCEIVER])

(a) Disconnect the antenna cord sub-assembly connector.

*a

Front view of wire harness connector

(to Antenna Cord Sub-assembly)

*b

Front view of wire harness connector

(to DCM [Telematics Transceiver])

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

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

I169-4 (TEL) - I186-1 (TEL [ANT3])

Always

Below 1 Ω

I169-4a - I169-1a

Always

Below 1 Ω

I169-4 (TEL) - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

5.

CHECK TELEPHONE ANTENNA (NAVIGATION ANTENNA ASSEMBLY)

(a) Replace the telephone antenna (navigation antenna assembly) with a known good one.

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(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 ANTENNA [NAVIGATION 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.
NEXT

PERFORM DCM ACTIVATION

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