Toyota Avalon (XX50) 2019-2022 Service & Repair Manual: Manual (SOS) Switch Green Indicator Malfunction (B1571)

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual / Audio, Visual, Telematics / Cellular Communication / Safety Connect System(for Gasoline Model) / Manual (SOS) Switch Green Indicator Malfunction (B1571)

DESCRIPTION

This DTC is set when the DCM (Telematics Transceiver) detects an open or short in the manual (SOS) switch green indicator circuit of the manual (SOS) switch. The manual (SOS) switch green indicator illuminates after the engine switch is turned on (IG).

If the safety connect system is not active, the manual (SOS) switch green indicator will turn off.

If the safety connect system is active, the manual (SOS) switch green indicator will blink while communicating with the call center.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

B1571

Manual (SOS) Switch Green Indicator Malfunction

Current for manual (SOS) switch green indicator reaches malfunction criteria for 10 seconds when engine switch is on (IG).
  • Roof console box sub-assembly
  • Wire harness or connector
  • DCM (Telematics Transceiver)

WIRING DIAGRAM

w/o Sliding Roof w/ Sliding Roof

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

PROCEDURE

1.

CONFIRM MODEL

(a) Choose the model to be inspected.

Result

Proceed to

w/ Sliding Roof

A

w/o Sliding Roof

B
B

GO TO STEP 11

A

2.

CHECK DTC

(a) Turn the engine switch off.

(b) Connect the Techstream to the DLC3.

(c) Turn the engine switch on (IG) 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 B1570, B1571 and B15C5 are output

A

DTC B1571 is output

(DTC B1570 and B15C5 are not output)

B
B

GO TO STEP 6

A

3.

INSPECT ROOF CONSOLE BOX SUB-ASSEMBLY (GREEN INDICATOR)

(a) Disconnect the O10 roof console box sub-assembly connector.

*a

Component without harness connected

(Roof Console Box Sub-assembly)

(b) Connect 2 dry-cell batteries (1.5 V each) in series.

(c) Connect the positive (+) lead to terminal 11 (IND2) and the negative (-) lead to terminal 16 (GND3) of the roof console box sub-assembly connector.

(d) Check if the illumination for the manual (SOS) switch green indicator comes on.

OK:

Green indicator comes on.

NG

REPLACE ROOF CONSOLE BOX SUB-ASSEMBLY

OK

4.

CHECK HARNESS AND CONNECTOR (DCM (TELEMATICS TRANSCEIVER) - ROOF CONSOLE BOX SUB-ASSEMBLY)

(a) Disconnect the G9 DCM (Telematics Transceiver) connector.

(b) Disconnect the O10 roof console box sub-assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

G9-26 (SIG-) - O10-16 (GND3)

Always

Below 1 Ω

G9-26 (SIG-) or O10-16 (GND3) - Body ground

Always

10 kΩ or higher

G9-12 (IND2) - O10-11 (IND2)

Always

Below 1 Ω

G9-12 (IND2) or O10-11 (IND2) - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

5.

REPLACE DCM (TELEMATICS TRANSCEIVER)

(a) Replace the DCM (Telematics Transceiver).

Click here

NOTICE:

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

PERFORM DCM ACTIVATION

6.

CHECK ROOF CONSOLE BOX SUB-ASSEMBLY (MANUAL (SOS) SWITCH GREEN INDICATOR CONDITION)

(a) Confirm the green indicator status after the engine switch is turned on (IG).

Click here

Result

Proceed to

Green indicator remains off

A

Green indicator remains on

B
B

GO TO STEP 10

A

7.

INSPECT ROOF CONSOLE BOX SUB-ASSEMBLY (GREEN INDICATOR INPUT VOLTAGE)

(a) Remove the roof console box sub-assembly but do not disconnect the connectors.

Click here

*a

Component with harness connected

(Roof Console Box Sub-assembly)

(b) Connect the positive lead of a voltmeter to terminal O10-11 (IND2), and the negative lead to terminal O10-16 (GND3).

(c) Measure the voltage.

Standard:

1.0 to 8.5 V for 2 seconds after the engine switch is turned on (IG) and red indicator has turned off.

0 V when the engine switch is off.

OK

REPLACE ROOF CONSOLE BOX SUB-ASSEMBLY

NG

8.

INSPECT DCM (TELEMATICS TRANSCEIVER) (GREEN INDICATOR OUTPUT VOLTAGE)

(a) Remove the DCM (Telematics Transceiver) but do not disconnect the connectors.

Click here

*a

Component with harness connected

(DCM (Telematics Transceiver))

(b) Connect the positive lead of a voltmeter to terminal G9-12 (IND2), and the negative lead to body ground.

(c) Measure the voltage.

Standard:

1.0 to 8.5 V for 2 seconds after the engine switch is turned on (IG) and red indicator has turned off.

0 V when the engine switch is off.

OK

REPAIR OR REPLACE HARNESS OR CONNECTOR
NG

9.

CHECK HARNESS AND CONNECTOR (DCM (TELEMATICS TRANSCEIVER) - BODY GROUND)

(a) Remove the DCM (Telematics Transceiver) but do not disconnect the connectors.

Click here

*a

Component with harness connected

(DCM (Telematics Transceiver))

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

G9-12 (IND2) - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

10.

REPLACE DCM (TELEMATICS TRANSCEIVER)

(a) Replace the DCM (Telematics Transceiver).

Click here

NOTICE:

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

PERFORM DCM ACTIVATION

11.

CHECK DTC

(a) Turn the engine switch off.

(b) Connect the Techstream to the DLC3.

(c) Turn the engine switch on (IG) 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 B1570, B1571 and B15C5 are output

A

DTC B1571 is output

(DTC B1570 and B15C5 are not output)

B
B

GO TO STEP 15

A

12.

INSPECT ROOF CONSOLE BOX SUB-ASSEMBLY (GREEN INDICATOR)

(a) Disconnect the O9 roof console box sub-assembly connector.

*a

Component without harness connected

(Roof Console Box Sub-assembly)

(b) Connect 2 dry-cell batteries (1.5 V each) in series.

(c) Connect the positive (+) lead to terminal 8 (IND2) and the negative (-) lead to terminal 12 (GND3) of the roof console box sub-assembly connector.

(d) Check if the illumination for the manual (SOS) switch green indicator comes on.

OK:

Green indicator comes on.

NG

REPLACE ROOF CONSOLE BOX SUB-ASSEMBLY

OK

13.

CHECK HARNESS AND CONNECTOR (DCM (TELEMATICS TRANSCEIVER) - ROOF CONSOLE BOX SUB-ASSEMBLY)

(a) Disconnect the G9 DCM (Telematics Transceiver) connector.

(b) Disconnect the O9 roof console box sub-assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

G9-26 (SIG-) - O9-12 (GND3)

Always

Below 1 Ω

G9-26 (SIG-) or O9-12 (GND3) - Body ground

Always

10 kΩ or higher

G9-12 (IND2) - O9-8 (IND2)

Always

Below 1 Ω

G9-12 (IND2) or O9-8 (IND2) - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

14.

REPLACE DCM (TELEMATICS TRANSCEIVER)

(a) Replace the DCM (Telematics Transceiver).

Click here

NOTICE:

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

PERFORM DCM ACTIVATION

15.

CHECK ROOF CONSOLE BOX SUB-ASSEMBLY (MANUAL (SOS) SWITCH GREEN INDICATOR CONDITION)

(a) Confirm the green indicator status after the engine switch is turned on (IG).

Click here

Result

Proceed to

Green indicator remains off

A

Green indicator remains on

B
B

GO TO STEP 10

A

16.

INSPECT ROOF CONSOLE BOX SUB-ASSEMBLY (GREEN INDICATOR INPUT VOLTAGE)

(a) Remove the roof console box sub-assembly but do not disconnect the connectors.

Click here

*a

Component with harness connected

(Roof Console Box Sub-assembly)

(b) Connect the positive lead of a voltmeter to terminal O9-8 (IND2), and the negative lead to terminal O9-12 (GND3).

(c) Measure the voltage.

Standard:

1.0 to 8.5 V for 2 seconds after the engine switch is turned on (IG) and red indicator has turned off.

0 V when the engine switch is off.

OK

REPLACE ROOF CONSOLE BOX SUB-ASSEMBLY

NG

17.

INSPECT DCM (TELEMATICS TRANSCEIVER) (GREEN INDICATOR OUTPUT VOLTAGE)

(a) Remove the DCM (Telematics Transceiver) but do not disconnect the connectors.

Click here

*a

Component with harness connected

(DCM (Telematics Transceiver))

(b) Connect the positive lead of a voltmeter to terminal G9-12 (IND2), and the negative lead to body ground.

(c) Measure the voltage.

Standard:

1.0 to 8.5 V for 2 seconds after the engine switch is turned on (IG) and red indicator has turned off.

0 V when the engine switch is off.

OK

REPAIR OR REPLACE HARNESS OR CONNECTOR
NG

18.

CHECK HARNESS AND CONNECTOR (DCM (TELEMATICS TRANSCEIVER) - BODY GROUND)

(a) Remove the DCM (Telematics Transceiver) but do not disconnect the connectors.

Click here

*a

Component with harness connected

(DCM (Telematics Transceiver))

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

G9-12 (IND2) - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

19.

REPLACE DCM (TELEMATICS TRANSCEIVER)

(a) Replace the DCM (Telematics Transceiver).

Click here

NOTICE:

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

PERFORM DCM ACTIVATION

    Manual (SOS) Switch Red Indicator Malfunction (B1570)

    Telephone Microphone Error (B1572)

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