CELLULAR COMMUNICATION: SAFETY CONNECT SYSTEM: B1536,B1537; Short in Telephone SUB Antenna Circuit; 2019 MY RAV4 RAV4 HV [11/2018

Last Modified: 01-30-2024	6.11:8.1.0	Doc ID: RM100000001EH06
Model Year Start: 2019	Model: RAV4	Prod Date Range: [11/2018 - 10/2019]
Title: CELLULAR COMMUNICATION: SAFETY CONNECT SYSTEM: B1536,B1537; Short in Telephone SUB Antenna Circuit; 2019 MY RAV4 RAV4 HV [11/2018 - 10/2019]

DTC

B1536

Short in Telephone SUB Antenna Circuit

DTC

B1537

Open in Telephone SUB Antenna Circuit

DESCRIPTION

These DTCs are stored when the DCM (Telephone Transceiver Assembly) detects an open or a short in the telephone and GPS antenna assembly (navigation antenna assembly) circuit. The DCM (Telephone Transceiver Assembly) oscillates and receives 824 - 894 MHz or 1850 - 1990 MHz radio-frequency through the telephone and GPS antenna assembly (navigation antenna assembly).

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

B1536

Short in Telephone SUB Antenna Circuit

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

(Short circuit)

DCM (Telephone Transceiver Assembly)
Telephone and GPS Antenna (navigation antenna assembly)
Telephone and GPS antenna cord (antenna cord sub-assembly)
Telephone and GPS antenna cord (No.2 antenna cord sub-assembly)

B1537

Open in Telephone SUB Antenna Circuit

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

(Open circuit)

DCM (Telephone Transceiver Assembly)
Telephone and GPS Antenna (navigation antenna assembly)
Telephone and GPS antenna cord (antenna cord sub-assembly)
Telephone and GPS antenna cord (No.2 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.

Click here

Body Electrical > Telematics > Clear DTCs

(f) Recheck for DTCs.

Click here

Body Electrical > Telematics > Trouble Codes

Result	Proceed to
DTC B1536 or B1537 is output	A
DTC B1536 or B1537 is not output	B

CHECK FOR INTERMITTENT PROBLEMS

2.	INSPECT TELEPHONE AND GPS ANTENNA ASSEMBLY (NAVIGATION ANTENNA ASSEMBLY)

(a) Remove the telephone and GPS antenna cord (antenna cord sub-assembly).

Click here

*a	Component without harness connected (Telephone and GPS Antenna Assembly (Navigation Antenna Assembly))

(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 (NAVIGATION ANTENNA ASSEMBLY)

3.	CHECK TELEPHONE AND GPS ANTENNA CORD (ANTENNA CORD SUB-ASSEMBLY)

(a) Disconnect the telephone and GPS antenna cord (antenna cord sub-assembly) from the telephone and GPS antenna (navigation antenna assembly) connector.

Front view of wire harness connector

(to Telephone and GPS Antenna (Navigation Antenna Assembly))

Front view of wire harness connector

(to Telephone and GPS Antenna Cord (No. 2 Antenna Cord Sub-assembly))

(b) Disconnect the telephone and GPS antenna cord (antenna cord sub-assembly) from the telephone and GPS antenna cord (No. 2 antenna cord sub-assembly) connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
D-4 - E-5	Always	Below 1 Ω
D-4a - E-5a	Always	Below 1 Ω
D-4 or E-5 - Body ground	Always	10 kΩ or higher
D-4a or E-5a - Body ground	Always	10 kΩ or higher

REPLACE TELEPHONE AND GPS ANTENNA CORD (ANTENNA CORD SUB-ASSEMBLY)

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

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

Front view of wire harness connector

(to Telephone and GPS Antenna Cord (Antenna Cord Sub-assembly))

Front view of wire harness connector

(to DCM (Telephone Transceiver Assembly))

(b) Disconnect the telephone and GPS antenna cord (No. 2 antenna cord sub-assembly) from the DCM (Telephone Transceiver Assembly).

Standard Resistance:

Tester Connection	Condition	Specified Condition
E-5 - H-1	Always	Below 1 Ω
E-5a - H-1a	Always	Below 1 Ω
E-5 or H-1 - Body ground	Always	10 kΩ or higher
E-5a or H-1a - Body ground	Always	10 kΩ or higher

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

5.	REPLACE TELEPHONE AND GPS ANTENNA ASSEMBLY (NAVIGATION ANTENNA ASSEMBLY)

(a) Replace the telephone and GPS antenna assembly (navigation antenna assembly) 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 (TELEPHONE TRANSCEIVER ASSEMBLY)

(a) Replace the DCM (Telephone Transceiver Assembly).

Click here

NOTICE:

The ignition switch must be off.
Do not exchange the DCM (Telephone Transceiver Assembly) with one from another vehicle.

PERFORM DCM ACTIVATION