Toyota Avalon Service & Repair Manual: Short in GPS Antenna (B15C0,B15C1)

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 (No. 2 antenna cord sub-assembly)
  • Telephone and GPS antenna cord (No. 3 antenna cord sub-assembly)
  • Telephone and GPS antenna cord (No. 4 antenna cord sub-assembly)
  • Telephone and GPS antenna cord (No. 6 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 (No. 2 antenna cord sub-assembly)
  • Telephone and GPS antenna cord (No. 3 antenna cord sub-assembly)
  • Telephone and GPS antenna cord (No. 4 antenna cord sub-assembly)
  • Telephone and GPS antenna cord (No. 6 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

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

    Click here

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. 6 ANTENNA CORD SUB-ASSEMBLY)

(a) Disconnect the D telephone and GPS antenna cord (No. 6 antenna cord sub-assembly) connector.

*a

Component without harness connected (Telephone and GPS Antenna Cord (No. 6 Antenna Cord Sub-assembly))

(b) Disconnect the C telephone and GPS antenna cord (No. 6 antenna cord sub-assembly) connector.

*a

Component without harness connected (Telephone and GPS Antenna Cord (No. 6 Antenna Cord Sub-assembly))

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

D-2 - C-1

Always

Below 1 Ω

D-2 or C-1 - Body ground

Always

10 kΩ or higher

D-2a - C-1a

Always

Below 1 Ω

D-2a or C-1a - Body ground

Always

10 kΩ or higher

NG

REPLACE TELEPHONE AND GPS ANTENNA CORD (NO. 6 ANTENNA CORD SUB-ASSEMBLY)

OK

3.

INSPECT TELEPHONE AND GPS ANTENNA CORD (NO. 4 ANTENNA CORD SUB-ASSEMBLY)

(a) Disconnect the G telephone and GPS antenna cord (No. 4 antenna cord sub-assembly) connector.

*a

Component without harness connected (Telephone and GPS Antenna Cord (No. 4 Antenna Cord Sub-assembly))

(b) Disconnect the E telephone and GPS antenna cord (No. 4 antenna cord sub-assembly) connector.

*a

Component without harness connected (Telephone and GPS Antenna Cord (No. 4 Antenna Cord Sub-assembly))

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

G-2 - E-2

Always

Below 1 Ω

G-2 or E-2 - Body ground

Always

10 kΩ or higher

G-2a - E-2a

Always

Below 1 Ω

G-2a or E-2a - Body ground

Always

10 kΩ or higher

NG

REPLACE TELEPHONE AND GPS ANTENNA CORD (NO. 4 ANTENNA CORD SUB-ASSEMBLY)

OK

4.

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

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

*a

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

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

*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:

Tester Connection

Condition

Specified Condition

I-2 - H-2

Always

Below 1 Ω

I-2 or H-2 - Body ground

Always

10 kΩ or higher

I-2a - H-2a

Always

Below 1 Ω

I-2a or H-2a - Body ground

Always

10 kΩ or higher

NG

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

OK

5.

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

(a) Disconnect the K 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 J 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

K-2 - J-2

Always

Below 1 Ω

K-2 or J-2 - Body ground

Always

10 kΩ or higher

K-2a - J-2a

Always

Below 1 Ω

K-2a or J-2a - Body ground

Always

10 kΩ or higher

NG

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

OK

6.

REPLACE TELEPHONE AND GPS ANTENNA ASSEMBLY (for Roof Side)

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

Click here

OK:

The system returns to normal.

OK

END

NG

7.

REPLACE DCM (TELEMATICS TRANSCEIVER)

(a) Replace the DCM (Telematics Transceiver).

Click here

NOTICE:

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

PERFORM DCM ACTIVATION

    Telematics Transceiver Malfunction (B15A8)

    Airbag Signal Malfunction/Not Input (B15C4)

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