CELLULAR COMMUNICATION: SAFETY CONNECT SYSTEM (for HV Model): B15C111,B15C113; GNSS Antenna Circuit Short to Ground; 2023 - 2025 MY Corolla Corolla HV [09/2022

Last Modified: 05-13-2024	6.11:8.1.0	Doc ID: RM1000000026POJ
Model Year Start: 2023	Model: Corolla	Prod Date Range: [09/2022 - ]
Title: CELLULAR COMMUNICATION: SAFETY CONNECT SYSTEM (for HV Model): B15C111,B15C113; GNSS Antenna Circuit Short to Ground; 2023 - 2025 MY Corolla Corolla HV [09/2022 - ]

DTC

B15C111

GNSS Antenna Circuit Short to Ground

DTC

B15C113

GNSS Antenna Circuit Open

DESCRIPTION

These DTCs are stored when a malfunction occurs in the telephone and GPS antenna (for Front Side) circuit.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

B15C111

GNSS Antenna Circuit Short to Ground

Current to the GNSS antenna is lower than the malfunction threshold for 10 seconds or more when the power switch is on (IG)

(Short circuit)

DCM (telematics transceiver)
Telephone and GPS antenna (for Front Side)
Telephone and GPS antenna cord (antenna cord sub-assembly)

B15C113

GNSS Antenna Circuit Open

Current to the GNSS antenna is higher than the malfunction threshold for 10 seconds or more when the power switch is on (IG)

(Open circuit)

DCM (telematics transceiver)
Telephone and GPS antenna (for Front Side)
Telephone and GPS 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.

Click here

PROCEDURE

CHECK DTC

(a) Turn the power switch off.

(b) Connect the Techstream to the DLC3.

(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.

USE SIMULATION METHOD TO CHECK

2.	INSPECT TELEPHONE AND GPS ANTENNA (FOR FRONT SIDE)

(a) Remove the telephone and GPS antenna (for Front Side).

Click here

(b) Current consumption check:

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

Standard Current:

Tester Connection	Condition	Specified Condition
3 (core) - 3a (shield)	4.2 to 5.0 V applied between terminals 3 and 3a	10 to 30 mA

NOTICE:

Do not apply 6 V or more between terminals 3 and 3a.

HINT:

If a stable power supply is not available, connect 4 nickel-metal hydride batteries (1.2 V each) or equivalent in series.

Component without harness connected

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

Voltage Applied between Terminals

REPLACE TELEPHONE AND GPS ANTENNA (FOR FRONT SIDE)

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

(a) Disconnect the D telephone and GPS antenna cord (antenna cord sub-assembly) connector.

*a	Component without harness connected (Telephone and GPS Antenna Cord (Antenna Cord Sub-assembly))

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

*a	Component without harness connected (Telephone and GPS Antenna Cord (Antenna Cord Sub-assembly))

Standard Resistance:

Tester Connection	Condition	Specified Condition
D-3 - B-1	Always	Below 1 Ω
D-3 or B-1 - Body ground	Always	10 kΩ or higher
D-3a - B-1a	Always	Below 1 Ω
D-3a or B-1a - Body ground	Always	10 kΩ or higher

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

4.	REPLACE DCM (TELEMATICS TRANSCEIVER)

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

Click here

NOTICE:

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

PERFORM DCM ACTIVATION