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

GO TO STEP 11

CHECK DTC

(a) Turn the engine 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 B1570, B1571 and B15C5 are output

DTC B1571 is output

(DTC B1570 and B15C5 are not output)

GO TO STEP 6

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.

REPLACE ROOF CONSOLE BOX SUB-ASSEMBLY

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.

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

REPAIR OR REPLACE HARNESS OR CONNECTOR

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.

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

GO TO STEP 10

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).

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.

REPLACE ROOF CONSOLE BOX SUB-ASSEMBLY

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.

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.

REPAIR OR REPLACE HARNESS OR CONNECTOR

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

REPAIR OR REPLACE HARNESS OR CONNECTOR

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.

PERFORM DCM ACTIVATION

11.

CHECK DTC

(a) Turn the engine 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 B1570, B1571 and B15C5 are output

DTC B1571 is output

(DTC B1570 and B15C5 are not output)

GO TO STEP 15

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.

REPLACE ROOF CONSOLE BOX SUB-ASSEMBLY

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.

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

REPAIR OR REPLACE HARNESS OR CONNECTOR

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.

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

GO TO STEP 10

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).

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.

REPLACE ROOF CONSOLE BOX SUB-ASSEMBLY

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.

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.

REPAIR OR REPLACE HARNESS OR CONNECTOR

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

REPAIR OR REPLACE HARNESS OR CONNECTOR

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.

PERFORM DCM ACTIVATION

Manual (SOS) Switch Red Indicator Malfunction (B1570)

Telephone Microphone Error (B1572)

See More:

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