Last Modified: 05-13-2024 6.11:8.1.0 Doc ID: RM1000000028I81
Model Year Start: 2023 Model: GR Corolla Prod Date Range: [11/2022 -           ]
Title: CELLULAR COMMUNICATION: SAFETY CONNECT SYSTEM (for Gasoline Model): B15CB11,B15CB13; Telephone Main Antenna Circuit Short to Ground; 2023 - 2025 MY Corolla Corolla Hatchback GR Corolla [11/2022 -        ]

DTC

B15CB11

Telephone Main Antenna Circuit Short to Ground

DTC

B15CB13

Telephone Main Antenna Circuit Open

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 (antenna cord sub-assembly)*2
  • Telephone and GPS antenna cord (No. 2 antenna cord sub-assembly)
  • Telephone and GPS antenna cord (No. 3 antenna cord sub-assembly)*2
  • Telephone and GPS antenna cord (antenna cord sub-assembly (for Type A))*1
  • Telephone and GPS antenna cord (antenna cord sub-assembly (for Type B))*1

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 (antenna cord sub-assembly)*2
  • Telephone and GPS antenna cord (No. 2 antenna cord sub-assembly)
  • Telephone and GPS antenna cord (No. 3 antenna cord sub-assembly)*2
  • Telephone and GPS antenna cord (antenna cord sub-assembly (for Type A))*1
  • Telephone and GPS antenna cord (antenna cord sub-assembly (for Type B))*1

*1: for Hatchback

*2: for Sedan

WIRING DIAGRAM

for Hatchback without SXM Function
for Hatchback with SXM Function
for Sedan without SXM Function
for Sedan with SXM Function

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 2023 - 2025 MY Corolla Corolla Hatchback GR Corolla [09/2022 -        ]; CELLULAR COMMUNICATION: SAFETY CONNECT SYSTEM (for Gasoline Model): PRECAUTION

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.

CHECK MODEL

(a) Choose the model to be inspected.

Result

Proceed to

for Hatchback

A

for Sedan

B
B

GO TO STEP 9

A

3.

INSPECT TELEPHONE AND GPS ANTENNA ASSEMBLY (for Roof Side)

(a) Disconnect the telephone and GPS antenna assembly (for Roof Side) connector.

*a

Component without harness connected

(Telephone and GPS Antenna Assembly (for Roof Side))

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

4 - 4a

Always

9 to 11 kΩ
NG

REPLACE TELEPHONE AND GPS ANTENNA ASSEMBLY (for Roof Side)

OK

4.

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

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

*a

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

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

w/o SXM Function

*a

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

*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:

w/o SXM Function

Tester Connection

Condition

Specified Condition

I-4 - H-4

Always

Below 1 Ω

I-4a - H-4a

Always

Below 1 Ω

I-4 or H-4 - Body ground

Always

10 kΩ or higher

w/ SXM Function

Tester Connection

Condition

Specified Condition

I-4 - M-3

Always

Below 1 Ω

I-4a - M-3a

Always

Below 1 Ω

I-4 or M-3 - Body ground

Always

10 kΩ or higher
NG

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

OK

5.

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

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

w/o SXM Function

*a

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

*a

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

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

w/o SXM Function

*a

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

*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:

w/o SXM Function

Tester Connection

Condition

Specified Condition

G-4 - F-4

Always

Below 1 Ω

G-4a - F-4a

Always

Below 1 Ω

G-4 or F-4 - Body ground

Always

10 kΩ or higher

w/ SXM Function

Tester Connection

Condition

Specified Condition

L-3 - K-3

Always

Below 1 Ω

L-3a - K-3a

Always

Below 1 Ω

L-3 or K-3 - Body ground

Always

10 kΩ or higher
NG

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

OK

6.

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

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

w/o SXM Function

*a

Component without harness connected

(Telephone and GPS Antenna Cord (No. 2 Antenna Cord Sub-assembly))
w/ SXM Function

*a

Component without harness connected

(Telephone and GPS Antenna Cord (No. 2 Antenna Cord Sub-assembly))

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

*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:

w/o SXM Function

Tester Connection

Condition

Specified Condition

E-4 - C-1

Always

Below 1 Ω

E-4a - C-1a

Always

Below 1 Ω

E-4 or C-1 - Body ground

Always

10 kΩ or higher

w/ SXM Function

Tester Connection

Condition

Specified Condition

J-3 - C-1

Always

Below 1 Ω

J-3a - C-1a

Always

Below 1 Ω

J-3 or C-1 - Body ground

Always

10 kΩ or higher
NG

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

OK

7.

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 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [11/2022 -        ]; CELLULAR COMMUNICATION: TELEPHONE AND GPS ANTENNA (for Roof Side): REMOVAL

OK:

The system returns to normal.

OK

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

8.

REPLACE DCM (TELEMATICS TRANSCEIVER)

(a) Replace the DCM (telematics transceiver).

Click here 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [11/2022 -        ]; CELLULAR COMMUNICATION: DCM(TELEMATICS TRANSCEIVER): REMOVAL

NOTICE:

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

PERFORM DCM ACTIVATION

9.

INSPECT TELEPHONE AND GPS ANTENNA ASSEMBLY (for Roof Side)

(a) Disconnect the telephone and GPS antenna assembly (for Roof Side) connector.

(b) w/o SXM Function:

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

2 - 2a

Always

9 to 11 kΩ

*a

Component without harness connected

(Telephone and GPS Antenna Assembly (for Roof Side))

(c) w/ SXM Function:

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

4 - 4a

Always

9 to 11 kΩ

*a

Component without harness connected

(Telephone and GPS Antenna Assembly (for Roof Side))
NG

REPLACE TELEPHONE AND GPS ANTENNA ASSEMBLY (for Roof Side)

OK

10.

INSPECT TELEPHONE AND GPS ANTENNA CORD (NO. 3 ANTENNA CORD SUB-ASSEMBLY)

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

w/o SXM Function

*a

Component without harness connected (Telephone and GPS Antenna Cord (No. 3 Antenna Cord Sub-assembly))
w/ SXM Function

*a

Component without harness connected (Telephone and GPS Antenna Cord (No. 3 Antenna Cord Sub-assembly))

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

*a

Component without harness connected (Telephone and GPS Antenna Cord (No. 3 Antenna Cord Sub-assembly))

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

Standard Resistance:

w/o SXM Function

Tester Connection

Condition

Specified Condition

T-2 - O-3

Always

Below 1 Ω

T-2a - O-3a

Always

Below 1 Ω

T-2 or O-3 - Body ground

Always

10 kΩ or higher

w/ SXM Function

Tester Connection

Condition

Specified Condition

I-4 - O-3

Always

Below 1 Ω

I-4a - O-3a

Always

Below 1 Ω

I-4 or O-3 - Body ground

Always

10 kΩ or higher
NG

REPLACE TELEPHONE AND GPS ANTENNA CORD (NO. 3 ANTENNA CORD SUB-ASSEMBLY)

OK

11.

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

(a) Disconnect the antenna connector from the telephone and GPS antenna cord (No. 3 antenna cord sub-assembly).

*a

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

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

w/o SXM Function

*a

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

*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:

w/o SXM Function

Tester Connection

Condition

Specified Condition

N-3 - F-4

Always

Below 1 Ω

N-3a - F-4a

Always

Below 1 Ω

N-3 or F-4 - Body ground

Always

10 kΩ or higher

w/ SXM Function

Tester Connection

Condition

Specified Condition

N-3 - K-3

Always

Below 1 Ω

N-3a - K-3a

Always

Below 1 Ω

N-3 or K-3 - Body ground

Always

10 kΩ or higher
NG

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

OK

12.

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

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

w/o SXM Function

*a

Component without harness connected

(Telephone and GPS Antenna Cord (Antenna Cord Sub-assembly))
w/ SXM Function

*a

Component without harness connected

(Telephone and GPS Antenna Cord (Antenna Cord Sub-assembly))

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

*a

Component without harness connected

(Telephone and GPS Antenna Cord (Antenna Cord Sub-assembly))

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

Standard Resistance:

w/o SXM Function

Tester Connection

Condition

Specified Condition

E-4 - C-1

Always

Below 1 Ω

E-4a - C-1a

Always

Below 1 Ω

E-4 or C-1 - Body ground

Always

10 kΩ or higher

w/ SXM Function

Tester Connection

Condition

Specified Condition

J-3 - C-1

Always

Below 1 Ω

J-3a - C-1a

Always

Below 1 Ω

J-3 or C-1 - Body ground

Always

10 kΩ or higher
NG

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

OK

13.

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 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [11/2022 -        ]; CELLULAR COMMUNICATION: TELEPHONE AND GPS ANTENNA (for Roof Side): REMOVAL

OK:

The system returns to normal.

OK

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

GO TO STEP 8