Last Modified: 04-05-2023 6.11:8.1.0 Doc ID: RM1000000018M3E
Model Year Start: 2018 Model: Sienna Prod Date Range: [11/2017 -           ]
Title: CELLULAR COMMUNICATION: SAFETY CONNECT SYSTEM: B1536,B1537; Short in Telephone SUB Antenna Circuit; 2018 - 2020 MY Sienna [11/2017 -        ]

DTC

B1536

Short in Telephone SUB Antenna Circuit

DTC

B1537

Open in Telephone SUB Antenna Circuit

DESCRIPTION

These DTCs are stored when the DCM (Telematics Transceiver) detects an open or a short in the antenna cord sub-assembly 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 Front Side).

DTC No.

DTC Detection Condition

Trouble Area

B1536

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 (Telematics Transceiver)
  • Antenna cord sub-assembly

B1537

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

(Open circuit)
  • DCM (Telematics Transceiver)
  • 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 2018 - 2020 MY Sienna [11/2017 -        ]; CELLULAR COMMUNICATION: SAFETY CONNECT SYSTEM: HEALTH CHECK

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

    Click here 2018 MY Sienna [11/2017 - 08/2018]; CELLULAR COMMUNICATION: SAFETY CONNECT SYSTEM: PARTS LOCATION 2019 - 2020 MY Sienna [08/2018 -        ]; CELLULAR COMMUNICATION: SAFETY CONNECT SYSTEM: PARTS LOCATION

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) Perform "HEALTH CHECK" and check for current DTCs.

Click here 2018 - 2020 MY Sienna [11/2017 -        ]; CELLULAR COMMUNICATION: SAFETY CONNECT SYSTEM: HEALTH CHECK

Result

Proceed to

DTC B1536 or B1537 is output

A

DTC B1536 or B1537 is not output

B
B

CHECK FOR INTERMITTENT PROBLEMS

A

2.

INSPECT ANTENNA CORD SUB-ASSEMBLY

(a) Disconnect the AE antenna cord sub-assembly connector from the DCM (Telematics Transceiver).

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

AE-1 - AE-1a

Always

4 to 11 kΩ

*a

Front view of Antenna cord sub-assembly connector (to DCM (Telematics Transceiver))

Connector color: Natural

Proceed to

OK

NG
NG

REPLACE ANTENNA CORD SUB-ASSEMBLY

OK

3.

REPLACE ANTENNA CORD SUB-ASSEMBLY

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

Click here 2016 - 2020 MY Sienna [12/2015 -        ]; NAVIGATION / MULTI INFO DISPLAY: NAVIGATION ANTENNA: REMOVAL

OK:

The system returns to normal.

Proceed to

OK

NG
OK

END
NG

4.

REPLACE DCM (TELEMATICS TRANSCEIVER)

(a) Replace the DCM (Telematics Transceiver).

Click here 2018 - 2020 MY Sienna [11/2017 -        ]; CELLULAR COMMUNICATION: MAYDAY ECU: REMOVAL

NOTICE:

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

Proceed to

NEXT
NEXT

PERFORM DCM ACTIVATION