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)

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 ignition switch off.

(b) Connect the Techstream to the DLC3.

(c) Turn the ignition switch ON 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 B1573 or B15CB is output

A

DTC B1573 or B15CB is not output

B
B

CHECK FOR INTERMITTENT PROBLEMS

A

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
NG

REPLACE TELEPHONE AND GPS ANTENNA ASSEMBLY (for Roof Side)

OK

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))

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

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
NG

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

OK

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))

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

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
NG

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

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.

OK

END
NG

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.
NEXT

PERFORM DCM ACTIVATION

    Telematics Transceiver Malfunction (B15A8)
    DESCRIPTION This DTC is set when an error in the EEPROM or PLL IC is detected on the DCM (Telematics Transceiver) self-check. The EEPROM (Electrically Erasable Programmable Read-Only Memory) stor ...

    Backup Battery Failure (B15CC)
    DESCRIPTION This DTC is set when the DCM (Telematics Transceiver) detects one of the following: The BUB (Back-Up Battery) voltage drops or the BUB (Back-Up Battery) malfunctions. The ...

    Other materials:

    Toyota CH-R Service Manual > Continuously Variable Transaxle System: Hydraulic Test
    HYDRAULIC TEST CAUTION: Do not perform a stall test if there are any people or objects near the vehicle. The vehicle could begin moving suddenly, resulting in a serious accident. Do not perform a stall test if any wheel chocks are out of position. The ...

    Toyota CH-R Service Manual > Meter / Gauge System: Tachometer Malfunction
    DESCRIPTION In this circuit, the combination meter assembly receives engine speed signals from the ECM via CAN communication. The combination meter assembly displays the engine speed calculated based on the data received from the ECM. WIRING DIAGRAM CAUTION / NOTICE / HINT NOTICE: ...

    Toyota C-HR (AX20) 2023-2025 Owner's Manual

    Toyota CH-R Owners Manual

    Toyota CH-R Service Manual

    © 2017-2025 Copyright www.tochr.net
    0.0098