DTC B1571: Manual (SOS) Switch Green Indicator Malfunction [06/2018 - 10/2019]: Procedure

1. Turn the power switch off.
2. Connect the Techstream to the DLC3.
3. Turn the power switch on (IG) and wait for 10 seconds.
4. Turn the Techstream on.
5. Clear the DTCs.

   Body Electrical > Telematics > Clear DTCs 

6. Recheck for DTCs.

   Body Electrical > Telematics > Trouble Codes 

   Result

   Result	Proceed to
   DTC B1570, B1571 and B15C5 are output	A
   DTC B1571 is output (DTC B1570 and B15C5 are not output)	B

Result: 

B 

See step  5

Result: 

A 

See step  2

1. Disconnect the P12 map light sub-assembly connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Component without harness connected (Map Light Sub-assembly)

2. Connect 2 dry-cell batteries (1.5 V each) in series.
3. Connect the positive (+) lead to terminal 7 (IND2) and the negative (-) lead to terminal 9 (GND3) of the map light assembly connector.
4. Check if the illumination for the manual (SOS) switch green indicator comes on.

   OK

   Green indicator comes on.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE MAP LIGHT SUB-ASSEMBLY. Refer to  REMOVAL [06/2018 - ] 

Result: 

OK 

See step  3

1. Disconnect the G10 DCM (Telematics Transceiver) connector.
2. Disconnect the P12 map light sub-assembly connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   G10-26 (SIG-) - P12-9 (GND3)	Always	Below 1 Ω
   G10-26 (SIG-) or P12-9 (GND3) - Body ground	Always	10 kΩ or higher
   G10-12 (IND2) - P12-7 (IND2)	Always	Below 1 Ω
   G10-12 (IND2) or P12-7 (IND2) - Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  4

1. Replace the DCM (Telematics Transceiver).

   Refer to REMOVAL [06/2018 - 10/2019]

   NOTE:

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

   Result

   Proceed to
   NEXT

Result: 

NEXT 

PERFORM DCM ACTIVATION. Refer to  DCM ACTIVATION [06/2018 - 10/2019] 

1. Confirm the green indicator status after the power switch is turned on (IG).

   Refer to SYSTEM DESCRIPTION [06/2018 - 10/2019]

   Result

   Result	Proceed to
   Green indicator remains off	A
   Green indicator remains on	B

Result: 

B 

See step  9

Result: 

A 

See step  6

1. Remove the map light sub-assembly but do not disconnect the connectors.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Component with harness connected (Map Light Sub-assembly)

   Refer to REMOVAL [06/2018 - ]

2. Connect the positive lead of a voltmeter to terminal P12-7 (IND2), and the negative lead to terminal P12-9 (GND3).
3. Measure the voltage.

   Standard

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

   0 V when the power switch is off.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE MAP LIGHT SUB-ASSEMBLY. Refer to  REMOVAL [06/2018 - ] 

Result: 

NG 

See step  7

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

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Component with harness connected (DCM (Telematics Transceiver))

   Refer to REMOVAL [06/2018 - 10/2019]

2. Connect the positive lead of a voltmeter to terminal G10-12 (IND2), and the negative lead to body ground.
3. Measure the voltage.

   Standard

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

   0 V when the power switch is off.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

NG 

See step  8

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

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Component with harness connected (DCM (Telematics Transceiver))

   Refer to REMOVAL [06/2018 - 10/2019]

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   G10-12 (IND2) - Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  9

1. Replace the DCM (Telematics Transceiver).

   Refer to REMOVAL [06/2018 - 10/2019]

   NOTE:

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

   Result

   Proceed to
   NEXT

Result: 

NEXT 

PERFORM DCM ACTIVATION. Refer to  DCM ACTIVATION [06/2018 - 10/2019]