Toyota Corolla Cross Owners & Service Manuals

Toyota Corolla Cross: Telephone Main Antenna Circuit Short to Ground (B15CB11,B15CB13)

Toyota Corolla Cross (2022-2025) Service Manual / Audio & Visual & Telematics / Cellular Communication / Safety Connect System / Telephone Main Antenna Circuit Short to Ground (B15CB11,B15CB13)

DESCRIPTION

If an open or short circuit in the roof antenna assembly is detected as a result of a terminal check performed by the DCM (telematics transceiver), these DTCs will be stored.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

B15CB11

Telephone Main Antenna Circuit Short to Ground

Roof antenna assembly impedance (Ω) is lower than the malfunction threshold for 10 seconds or more when the ignition switch is ON (Short circuit)
  • DCM (telematics transceiver)
  • Roof antenna assembly
  • Antenna cord sub-assembly
  • No. 2 antenna cord sub-assembly
  • No. 3 antenna cord sub-assembly

B15CB13

Telephone Main Antenna Circuit Open

Roof antenna assembly impedance (Ω) is higher than the malfunction threshold for 10 seconds or more when the ignition switch is ON (Open circuit)
  • DCM (telematics transceiver)
  • Roof antenna assembly
  • Antenna cord sub-assembly
  • No. 2 antenna cord sub-assembly
  • No. 3 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 Telematics System.

    Click here

  • When replacing the DCM (telematics transceiver), make sure to replace it with a new one.

PROCEDURE

1.

CLEAR DTC

(a) Clear the DTCs.

Body Electrical > Telematics > Clear DTCs
NEXT

2.

CHECK DTC

(a) Turn the ignition switch to ON and wait for 10 seconds or more.

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

Body Electrical > Telematics > Trouble Codes

Result

Proceed to

DTCs are not output

A

DTC B15CB11 or B15CB13 is output

B
A

USE SIMULATION METHOD TO CHECK

B

3.

INSPECT ROOF ANTENNA ASSEMBLY

(a) Remove the roof antenna assembly.

HINT:

Click here

*a

Component without harness connected

(Roof Antenna Assembly)

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

J-4 - J-4a

Always

9 to 11 kΩ
NG

REPLACE ROOF ANTENNA ASSEMBLY

OK

4.

CHECK NO. 3 ANTENNA CORD SUB-ASSEMBLY

(a) Disconnect the No. 3 antenna cord sub-assembly from the roof antenna assembly connector.

*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 No. 3 antenna cord sub-assembly from the No. 2 antenna cord sub-assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

J-4 - I-3

Always

Below 1 Ω

J-4a - I-3a

Always

Below 1 Ω

J-4 - I-3 - Body ground

Always

10 kΩ or higher
NG

REPLACE NO. 3 ANTENNA CORD SUB-ASSEMBLY

OK

5.

CHECK NO. 2 ANTENNA CORD SUB-ASSEMBLY

(a) Disconnect the No. 2 antenna cord sub-assembly from the No. 3 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 No. 3 Antenna Cord Sub-assembly)

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

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

H-3 - G-3

Always

Below 1 Ω

H-3a - G-3a

Always

Below 1 Ω

H-3 - G-3 - Body ground

Always

10 kΩ or higher
NG

REPLACE NO. 2 ANTENNA CORD SUB-ASSEMBLY

OK

6.

INSPECT ANTENNA CORD SUB-ASSEMBLY

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

*a

Front view of wire harness connector

(to DCM (Telematics Transceiver))

*b

Front view of wire harness connector

(to No. 2 antenna Cord Sub-assembly)

(b) Disconnect the antenna cord sub-assembly 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

E-1 - F-3

Always

Below 1 Ω

E-1a - F-3a

Always

Below 1 Ω

E-1 or F-3 - Body ground

Always

10 kΩ or higher
NG

REPLACE ANTENNA CORD SUB-ASSEMBLY

OK

7.

REPLACE DCM (TELEMATICS TRANSCEIVER)

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

HINT:

Click here

NEXT

PERFORM DCM ACTIVATION

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