Toyota CH-R Service Manual: Short in Telephone Antenna Circuit (B1573,B15CB)

Toyota CH-R Service Manual / Cellular Communication / Safety Connect System / Short in Telephone Antenna Circuit (B1573,B15CB)

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) oscillates and receives 824 - 894 MHz or 1850 - 1990 MHz radio-frequency through the telephone and GPS antenna assembly (for Roof Side).

DTC No.	Detection Item	DTC Detection Condition	Trouble Area
B1573	Short in Telephone Antenna Circuit	Telephone and GPS antenna assembly (for Roof Side) impedance is lower than malfunction criterion for 10 seconds when ignition switch is ON. (Short circuit)	DCM (Telematics Transceiver) Telephone and GPS antenna assembly (for Roof Side) Telephone and GPS antenna cord (No. 3 antenna cord sub-assembly) Telephone and GPS antenna cord (No. 6 antenna cord sub-assembly)
B15CB	Telematics Transceiver Antenna Disconnected	Telephone and GPS antenna assembly (for Roof Side) impedance is higher than malfunction criterion for 10 seconds when ignition switch is ON. (Open circuit)	DCM (Telematics Transceiver) Telephone and GPS antenna assembly (for Roof Side) Telephone and GPS antenna cord (No. 3 antenna cord sub-assembly) Telephone and GPS antenna cord (No. 6 antenna cord sub-assembly)

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

B1573

Short in Telephone Antenna Circuit

Telephone and GPS antenna assembly (for Roof Side) impedance is lower than malfunction criterion for 10 seconds when ignition switch is ON.

(Short circuit)

DCM (Telematics Transceiver)
Telephone and GPS antenna assembly (for Roof Side)
Telephone and GPS antenna cord (No. 3 antenna cord sub-assembly)
Telephone and GPS antenna cord (No. 6 antenna cord sub-assembly)

B15CB

Telematics Transceiver Antenna Disconnected

Telephone and GPS antenna assembly (for Roof Side) impedance is higher than malfunction criterion for 10 seconds when ignition switch is ON.

(Open circuit)

DCM (Telematics Transceiver)
Telephone and GPS antenna assembly (for Roof Side)
Telephone and GPS antenna cord (No. 3 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

CHECK DTC

(a) Turn the ignition switch off.

(b) Connect the Techstream to the DLC3.

(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 B1573 or B15CB is output	A
DTC B1573 or B15CB is not output	B

CHECK FOR INTERMITTENT PROBLEMS

2.	INSPECT TELEPHONE AND GPS ANTENNA ASSEMBLY (for Roof Side)

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

*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	4 to 11 kΩ

REPLACE TELEPHONE AND GPS ANTENNA ASSEMBLY (for Roof Side)

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

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

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

(b) Disconnect the E telephone and GPS antenna cord (No. 3 antenna cord sub-assembly) connector from the telephone and GPS antenna cord (No. 6 antenna cord sub-assembly).

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
F-4 - E-1	Always	Below 1 Ω
F-4 or E-1 - Body ground	Always	10 kΩ or higher
F-4a - E-1a	Always	Below 1 Ω
F-4a or E-1a - Body ground	Always	10 kΩ or higher

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

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

(a) Disconnect the E telephone and GPS antenna cord (No. 6 antenna cord sub-assembly) 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. 6 antenna Cord Sub-assembly))

(b) Disconnect the B telephone and GPS antenna cord (No. 6 antenna cord sub-assembly) connector from the telematics transceiver.

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

Standard Resistance:

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

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

5.	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.

END

6.	REPLACE DCM (TELEMATICS TRANSCEIVER)

(a) Replace the DCM (Telematics Transceiver).

Click here

NOTICE:

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

PERFORM DCM ACTIVATION

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