Last Modified: 05-13-2024 6.11:8.1.0 Doc ID: RM100000001LF5P
Model Year Start: 2020 Model: GR Corolla Prod Date Range: [09/2019 - 04/2020]
Title: CELLULAR COMMUNICATION: SAFETY CONNECT SYSTEM (for Sedan, Gasoline Model): B15C0,B15C1; Short in GPS Antenna; 2020 MY Corolla Corolla Hatchback GR Corolla [09/2019 - 04/2020]

DTC

B15C0

Short in GPS Antenna

DTC

B15C1

Open in GPS Antenna

DESCRIPTION

These DTCs are stored when the DCM (Telematics Transceiver) detects an open or a short in the telephone and GPS antenna assembly (for Roof Side) circuit. The DCM (Telematics Transceiver) receives 1574.42 - 1576.42 MHz radio frequency signals from satellites through the telephone and GPS antenna assembly (for Roof Side). The cable is a 50 Ω coaxial cable.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

B15C0

Short in GPS Antenna

Current for telephone and GPS antenna assembly (for Roof Side) is lower (Ω) malfunction criterion for 10 seconds when engine switch is on (IG).

(Short circuit)
  • DCM (Telematics Transceiver)
  • Telephone and GPS antenna assembly (for Roof Side)
  • Telephone and GPS antenna cord (Antenna cord sub-assembly (for Type A))
  • Telephone and GPS antenna cord (Antenna cord sub-assembly (for Type B))
  • Telephone and GPS antenna cord (No. 2 antenna cord sub-assembly)

B15C1

Open in GPS Antenna

Current for telephone and GPS antenna assembly (for Roof Side) is higher (Ω) malfunction criterion for 10 seconds when engine switch is on (IG).

(Open circuit)
  • DCM (Telematics Transceiver)
  • Telephone and GPS antenna assembly (for Roof Side)
  • Telephone and GPS antenna cord (Antenna cord sub-assembly (for Type A))
  • Telephone and GPS antenna cord (Antenna cord sub-assembly (for Type B))
  • Telephone and GPS antenna cord (No. 2 antenna cord sub-assembly)

WIRING DIAGRAM

CAUTION / NOTICE / HINT

HINT:

  • Before performing this diagnostic procedure, make sure to perform Health Check and confirm that the DCM/VIN registration information is correct.

    Click here 2020 MY Corolla Corolla Hatchback GR Corolla [09/2019 - 04/2020]; CELLULAR COMMUNICATION: SAFETY CONNECT SYSTEM (for Sedan, Gasoline Model): HEALTH CHECK

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

    Click here 2020 MY Corolla Corolla Hatchback GR Corolla [09/2019 - 04/2020]; CELLULAR COMMUNICATION: SAFETY CONNECT SYSTEM (for Sedan, Gasoline Model): PARTS LOCATION

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.

(d) Turn the Techstream on.

(e) Clear the DTCs.

Body Electrical > Telematics > Clear DTCs

(f) Recheck for DTCs.

Body Electrical > Telematics > Trouble Codes

Result

Proceed to

DTC B15C0 or B15C1 is output

A

DTC B15C0 or B15C1 is not output

B
B

CHECK FOR INTERMITTENT PROBLEMS

A

2.

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

(a) Disconnect the E telephone and GPS antenna cord (No. 2 antenna cord sub-assembly) connector.

*a

Component without harness connected (Telephone and GPS Antenna Cord (No. 2 Antenna Cord Sub-assembly))

(b) Disconnect the B telephone and GPS antenna cord (No. 2 antenna cord sub-assembly) connector.

*a

Component without harness connected (Telephone and GPS Antenna Cord (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

E-2 - B-1

Always

Below 1 Ω

E-2 or B-1 - Body ground

Always

10 kΩ or higher

E-2a - B-1a

Always

Below 1 Ω

E-2a or B-1a - Body ground

Always

10 kΩ or higher
NG

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

OK

3.

INSPECT TELEPHONE AND GPS ANTENNA CORD (ANTENNA CORD SUB-ASSEMBLY (for Type A))

(a) Disconnect the F telephone and GPS antenna cord (antenna cord sub-assembly (for Type A)) connector.

*a

Component without harness connected (Telephone and GPS Antenna Cord (Antenna Cord Sub-assembly (for Type A)))

(b) Disconnect the G telephone and GPS antenna cord (antenna cord sub-assembly (for Type A)) connector.

*a

Component without harness connected (Telephone and GPS Antenna Cord (Antenna Cord Sub-assembly (for Type A)))

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

F-2 - G-4

Always

Below 1 Ω

F-2 or G-4 - Body ground

Always

10 kΩ or higher

F-2a - G-4a

Always

Below 1 Ω

F-2a or G-4a - Body ground

Always

10 kΩ or higher
NG

REPLACE TELEPHONE AND GPS ANTENNA CORD (ANTENNA CORD SUB-ASSEMBLY (for Type A))

OK

4.

INSPECT TELEPHONE AND GPS ANTENNA CORD (ANTENNA CORD SUB-ASSEMBLY (for Type B))

(a) Disconnect the I telephone and GPS antenna cord (antenna cord sub-assembly (for Type B)) connector.

*a

Component without harness connected (Telephone and GPS Antenna Cord (Antenna Cord Sub-assembly (for Type B)))

(b) Disconnect the H telephone and GPS antenna cord (antenna cord sub-assembly (for Type B)) connector.

*a

Component without harness connected (Telephone and GPS Antenna Cord (Antenna Cord Sub-assembly (for Type B)))

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

I-5 - H-4

Always

Below 1 Ω

I-5 or H-4 - Body ground

Always

10 kΩ or higher

I-5a - H-4a

Always

Below 1 Ω

I-5a or H-4a - Body ground

Always

10 kΩ or higher
NG

REPLACE TELEPHONE AND GPS ANTENNA CORD (ANTENNA CORD SUB-ASSEMBLY (for Type B))

OK

5.

REPLACE TELEPHONE AND GPS ANTENNA ASSEMBLY (for Roof Side)

(a) Replace the telephone and GPS antenna assembly (for Roof Side) with a new or known good one and check if the same problem occurs again.

Click here 2020 - 2022 MY Corolla Corolla Hatchback Corolla HV GR Corolla [03/2019 - 09/2022]; CELLULAR COMMUNICATION: TELEPHONE AND GPS ANTENNA (for Roof Side): REMOVAL

OK:

The system returns to normal.

OK

END
NG

6.

REPLACE DCM (TELEMATICS TRANSCEIVER)

(a) Replace the DCM (Telematics Transceiver).

Click here 2020 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2019 - 04/2020]; CELLULAR COMMUNICATION: DCM(TELEMATICS TRANSCEIVER): REMOVAL

NOTICE:

  • The engine switch must be off.
  • Do not swap the DCM (Telematics Transceiver) with one from another vehicle.
NEXT

PERFORM DCM ACTIVATION