Toyota 4Runner: Short in Telephone Antenna Circuit (B1573,B15CB)

Toyota 4Runner Service Manual / Audio / Visual / Telematics / Cellular Communication / Safety Connect System / Short in Telephone Antenna Circuit (B1573,B15CB)

DESCRIPTION

This DTC is stored when the DCM (Telematics Transceiver) detects an open or a short in the telephone and GPS antenna circuit. The DCM (Telematics Transceiver) sends and receives signals at a radio frequency of between 824 and 894 MHz or 1850 and 1990 MHz through the telephone and GPS antenna.

DTC Code	DTC Detection Condition	Trouble Area
B1573	The telephone and GPS antenna impedance is lower than the malfunction criterion for 10 seconds when the ignition switch is ON.	DCM (telematics transceiver) Telephone and GPS antenna (telephone antenna assembly) Telephone and GPS antenna cord (No. 3 antenna cord sub-assembly) Telephone and GPS antenna cord (No. 2 antenna cord sub-assembly) Telephone and GPS antenna cord (Instrument panel wire)
B15CB	The telephone and GPS antenna impedance is lower than the malfunction criterion for 10 seconds when the ignition switch is ON.

HINT:

Refer to "Parts Location" for the installation location of the telephone and GPS antenna cord (See page ).

PROCEDURE

1.	CHECK FOR DTC

(a) Turn the ignition switch off.

(b) Connect the Techstream to the DLC3.

(d) Perform "Health Check" and check for current DTCs (See page ).

Result

Result	Proceed to
DTC B1573 or B15CB is output	A
DTC B1573 and B15CB is not output	B

CHECK FOR INTERMITTENT PROBLEMS

2.	INSPECT TELEPHONE AND GPS ANTENNA (DCM - TELEPHONE AND GPS ANTENNA)

(a) Disconnect the telephone and GPS antenna connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
3 (TEL2) - 3a	Always	4 to 11 kΩ

Text in Illustration

*a	Telephone and GPS Antenna Assembly

REPLACE TELEPHONE AND GPS ANTENNA (TELEPHONE ANTENNA ASSEMBLY)

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

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

(b) Disconnect the No. 3 antenna cord sub-assembly from the No. 2 antenna cord sub-assembly.

Standard Resistance:

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

Text in Illustration

*a	Telephone and GPS Antenna Assembly Side
*b	No. 2 Antenna Cord Sub-assembly Side

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

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

(a) Disconnect the No. 2 antenna cord sub-assembly from the No. 3 antenna cord sub-assembly.

(b) Disconnect the No. 2 antenna cord sub-assembly from the No. 2 instrument panel wire.

Standard Resistance:

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

Text in Illustration

*a	Telephone Antenna Cord Sub-assembly Side
*b	No. 2 Instrument Panel Wire

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

5.	INSPECT TELEPHONE AND GPS ANTENNA CORD (NO. 2 INSTRUMENT PANEL WIRE)

(a) Disconnect the No. 2 instrument panel wire from the No. 2 antenna cord sub-assembly.

(b) Disconnect the No. 2 instrument panel wire from the DCM (telematics transceiver).

Standard Resistance:

Tester Connection	Condition	Specified Condition
E-3 - G44-1 (TEL1)	Always	Below 1 Ω
E-3a - G44-1a	Always	Below 1 Ω
E-3 - Body ground	Always	10 kΩ or higher
E-3a - Body ground	Always	10 kΩ or higher

Text in Illustration

*a	No. 2 Antenna Cord Sub-assembly Side
*b	DCM (Telematics Transceiver) Side

REPLACE TELEPHONE AND GPS ANTENNA CORD (NO. 2 INSTRUMENT PANEL WIRE)

6.	REPLACE TELEPHONE AND GPS ANTENNA (TELEPHONE ANTENNA ASSEMBLY)

(a) Replace the telephone and GPS antenna with a normally functioning one and check if the same problem occurs again (See page
).

OK:

The system returns to normal.

END (TELEPHONE AND GPS ANTENNA IS DEFECTIVE)

7.	REPLACE DCM (TELEMATICS TRANSCEIVER)

(a) Replace the DCM (Telematics Transceiver) (See page ).

NOTICE:

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

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