Last Modified: 04-05-2023 6.11:8.1.0 Doc ID: RM1000000018IYS
Model Year Start: 2018 Model: Sienna Prod Date Range: [11/2017 -           ]
Title: CELLULAR COMMUNICATION: SAFETY CONNECT SYSTEM: B15C0,B15C1; Short in GPS Antenna; 2018 - 2020 MY Sienna [11/2017 -        ]

DTC

B15C0

Short in GPS Antenna

DTC

B15C1

Open in GPS Antenna

DESCRIPTION

This DTC is set when the DCM (Telematics Transceiver) detects an open or a short in the telephone antenna circuit. The DCM (Telematics Transceiver) receives 1574.42 - 1576.42 MHz radio frequency signals from satellites through the telephone antenna assembly. The cable is a 50 Ω coaxial cable.

DTC No.

DTC Detection Condition

Trouble Area

B15C0

Current for telephone and GPS antenna assembly is lower (Ω) malfunction criterion for 10 seconds when ignition switch is ON.

(Short circuit)
  • DCM (Telematics Transceiver)
  • Telephone antenna assembly
  • Antenna cord sub-assembly
  • No. 2 antenna cord sub-assembly (roof headlining assembly)
  • No. 5 antenna cord sub-assembly

B15C1

Current for telephone and GPS antenna assembly is higher (Ω) malfunction criterion for 10 seconds when ignition switch is ON.

(Open circuit)

HINT:

Refer to "PARTS LOCATION" for the installation location of telephone and GPS antenna cord (See page 2018 MY Sienna [11/2017 - 08/2018]; CELLULAR COMMUNICATION: SAFETY CONNECT SYSTEM: PARTS LOCATION 2019 - 2020 MY Sienna [08/2018 -        ]; CELLULAR COMMUNICATION: SAFETY CONNECT SYSTEM: PARTS LOCATION ).

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 2018 - 2020 MY Sienna [11/2017 -        ]; CELLULAR COMMUNICATION: SAFETY CONNECT SYSTEM: HEALTH CHECK

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

    Click here 2018 MY Sienna [11/2017 - 08/2018]; CELLULAR COMMUNICATION: SAFETY CONNECT SYSTEM: PARTS LOCATION 2019 - 2020 MY Sienna [08/2018 -        ]; CELLULAR COMMUNICATION: SAFETY CONNECT SYSTEM: PARTS LOCATION

PROCEDURE

1.

CHECK DTC

(a) Turn the ignition switch off.

(b) Connect the Techstream to the DLC3.

(c) Turn the ignition switch to ON and wait for 10 seconds.

(d) Turn the Techstream on.

(e) Perform "HEALTH CHECK" and check for current DTCs (See page 2018 - 2020 MY Sienna [11/2017 -        ]; CELLULAR COMMUNICATION: SAFETY CONNECT SYSTEM: HEALTH CHECK ).

Result

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 ANTENNA CORD SUB-ASSEMBLY

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

*a

Component without harness connected

(Antenna Cord Sub-assembly)

(b) Disconnect the antenna cord sub-assembly connector from the DCM (Telematics Transceiver)

*a

Component without harness connected

(Antenna Cord Sub-assembly)

B Connector Color: Gray

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

AG-1 or AB-2

Always

Below 1 Ω

AG-1a - AC-2a

Always

Below 1 Ω

AG-1 or AC-2 - Body ground

Always

10 kΩ or higher

AG-1a or AC-2a - Body ground

Always

10 kΩ or higher
NG

REPLACE ANTENNA CORD SUB-ASSEMBLY

OK

3.

INSPECT NO. 2 ANTENNA CORD SUB-ASSEMBLY (ROOF HEADLINING ASSEMBLY)

(a) Disconnect the No. 2 antenna cord sub-assembly (roof headlining assembly) connector from the No. 5 antenna cord sub-assembly.

*a

Component without harness connected (No. 2 Antenna Cord Sub-assembly (Roof Headlining Assembly))

(b) Disconnect the No. 2 antenna cord sub-assembly (roof headlining assembly) connector from the antenna cord sub-assembly (for Antenna Side).

*a

Component without harness connected (No. 2 Antenna Cord Sub-assembly (Roof Headlining Assembly)

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

BC-1 - AB-2

Always

Below 1 Ω

BC-1 or AB-2 - Body ground

Always

10 kΩ or higher

BC-1a - AB-2a

Always

Below 1 Ω

BC-1a or AB-2a - Body ground

Always

10 kΩ or higher
NG

REPLACE ROOF HEADLINING ASSEMBLY

OK

4.

INSPECT ANTENNA CORD SUB-ASSEMBLY NO.5

(a) Disconnect the (No. 5 antenna cord sub-assembly) connector from the telephone antenna assembly.

*a

Component without harness connected (No. 5 Antenna Cord Sub-assembly)

(b) Disconnect the No. 5 antenna cord sub-assembly connector from the No. 2 antenna cord sub-assembly (roof headlining assembly).

*a

Component without harness connected (No. 5 Antenna Cord Sub-assembly)

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

CD-2 -BC-2

Always

Below 1 Ω

CD-2 or BC-2 - Body ground

Always

10 kΩ or higher

CD-2a - BC-2a

Always

Below 1 Ω

CD-2a or BC-2a - Body ground

Always

10 kΩ or higher
NG

REPLACE NO. 5 ANTENNA CORD SUB-ASSEMBLY

OK

5.

REPLACE TELEPHONE ANTENNA ASSEMBLY

(a) Replace the telephone antenna assembly with a normal one and check if the same problem occurs again (See page 2018 - 2020 MY Sienna [11/2017 -        ]; CELLULAR COMMUNICATION: TELEPHONE ANTENNA: REMOVAL ).

OK:

The system returns to normal.

OK

END
NG

6.

REPLACE DCM (TELEMATICS TRANSCEIVER)

(a) Replace the DCM (Telematics Transceiver) (See page 2018 - 2020 MY Sienna [11/2017 -        ]; CELLULAR COMMUNICATION: MAYDAY ECU: REMOVAL ).

NOTICE:

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

PERFORM DCM ACTIVATION