DTC B1570: Manual (SOS) Switch Red Indicator Malfunction [03/2017 - 06/2017]: Procedure

1. Turn the engine switch off.
2. Connect the Techstream to the DLC3.
3. Turn the engine 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 B1570 is output (DTC B1571 and B15C5 are not output)	B

Result: 

B 

See step  5

Result: 

A 

See step  2

1. Disconnect the V14 roof console box sub-assembly connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Component without harness connected (Roof Console Box Sub-assembly)

2. Connect 2 dry-cell batteries (1.5 V each) in series.
3. Connect the positive (+) lead to terminal 10 (IND1) and the negative (-) lead to terminal 16 (GND3) of the roof console box sub-assembly connector.
4. Check if the illumination for the manual (SOS) switch red indicator comes on.

   OK

   Red indicator comes on.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE ROOF CONSOLE BOX SUB-ASSEMBLY. Refer to  REMOVAL [03/2017 - ] 

Result: 

OK 

See step  3

1. Disconnect the K12 DCM (Telematics Transceiver) connector.
2. Disconnect the V14 roof console box sub-assembly connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   K12-26 (SIG-) - V14-16 (GND3)	Always	Below 1 Ω
   K12-26 (SIG-) or V14-16 (GND3) - Body ground	Always	10 kΩ or higher
   K12-11 (IND1) - V14-10 (IND1)	Always	Below 1 Ω
   K12-11 (IND1) or V14-10 (IND1) - 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 [03/2017 - 09/2019]

   NOTE:

   • The engine 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 [03/2017 - 09/2019] 

1. Confirm the red indicator status after the engine switch is turned on (IG).

   Refer to SYSTEM DESCRIPTION [03/2017 - 09/2019]

   Result

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

Result: 

B 

See step  9

Result: 

A 

See step  6

1. Remove the roof console box sub-assembly but do not disconnect the connectors.

   Refer to REMOVAL [03/2017 - ]

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Component with harness connected (Roof Console Box Sub-assembly)

2. Connect the positive lead of a voltmeter to terminal V14-10 (IND1), and the negative lead to terminal V14-16 (GND3).
3. Measure the voltage.

   Standard

   1.0 to 8.5 V for 2 seconds after the engine switch is turned on (IG).

   0 V when the engine switch is off.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE ROOF CONSOLE BOX SUB-ASSEMBLY. Refer to  REMOVAL [03/2017 - ] 

Result: 

NG 

See step  7

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

   Refer to REMOVAL [03/2017 - 09/2019]

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

2. Connect the positive lead of a voltmeter to terminal K12-11 (IND1), and the negative lead to body ground.
3. Measure the voltage.

   Standard

   1.0 to 8.5 V for 2 seconds after the engine switch is turned on (IG).

   0 V when the engine 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.

   Refer to REMOVAL [03/2017 - 09/2019]

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   K12-11 (IND1) - 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 [03/2017 - 09/2019]

   NOTE:

   • The engine 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 [03/2017 - 09/2019]