DTC B1571: Manual (SOS) Switch Green Indicator Malfunction: Procedure

1. Turn the ignition switch off.
2. Connect the Techstream to the DLC3.
3. Turn the ignition switch to ON and wait for 10 seconds.
4. Turn the Techstream on.
5. Perform "HEALTH CHECK" and check for current DTCs. Refer to HEALTH CHECK .
   RESULT
   
   

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

B → See step   5 

A: Go to next step 

1. Disconnect the T5 roof console box assembly connector.
   Fig 1: Checking T5 Roof Console Box Assembly Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Connect 2 dry-cell batteries (1.5 V each) in series.
3. Connect the positive (+) lead to terminal T5-6 (IND2) and the negative (-) lead to terminal T5-3 (SIG2) of the roof console box assembly connectors.
4. Check if the illumination for the manual (SOS) switch green indicator comes on.

   OK

   Green indicator comes on.

   TEXT IN ILLUSTRATION
   
   

   *1	Component without harness connected (Roof Console Box Assembly)

NG → See step   10 

OK: Go to next step 

1. Remove the D73 DCM (Telematics Transceiver) connector.
   Fig 2: Checking Harness And Connector (DCM - Roof Console Box)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Remove the T5 roof console box assembly connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   D73-26 (SIG-) - T5-3 (SIG2)	Always	Below 1 Ω
   D73-26 (SIG-) - Body ground	Always	10 kΩ or higher

   TEXT IN ILLUSTRATION
   
   

   *1	Front view of wire harness connector (to DCM (Telematics Transceiver))
   *2	Front view of wire harness connector (to Roof Console Box Assembly)

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Replace the DCM (Telematics Transceiver. Refer to REMOVAL .
   NOTE:

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

NEXT → See step   11 

1. Confirm the green indicator status after the ignition switch to ON. Refer to SYSTEM DESCRIPTION .
   RESULT
   
   

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

B → See step   9 

A: Go to next step 

1. Remove the roof console box assembly but do not disconnect the connectors. Refer to REMOVAL .
   Fig 3: Checking T5 Roof Console Box Assembly Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Connect the positive lead of a voltmeter to terminal T5-6 (IND2), and the negative lead to terminal T5-3 (SIG2).
3. Measure the voltage.

   Standard

   After ignition switch to ON and red indicator has subsequently turned off, 1.0 to 8.5 V in 2 seconds.

   0 V when the ignition switch is off.

   TEXT IN ILLUSTRATION
   
   

   *1	Component with harness connected (Roof Console Box Assembly)

NG → See step   7 

OK → See step   12 

1. Remove the DCM (Telematics Transceiver) but do not disconnect the connectors. Refer to REMOVAL .
   Fig 4: Checking D73 DCM (Telematics Transceiver) Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Connect the positive lead of a voltmeter to terminal D73-12 (IND2), and the negative lead to body ground.
3. Measure the voltage.

   Standard

   After ignition switch to ON and red indicator has subsequently turned off, 1.0 to 8.5 V in 2 seconds.

   0 V when the ignition switch is off.

   TEXT IN ILLUSTRATION
   
   

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

NG → See step   8 

OK → REPAIR OR REPLACE HARNESS OR CONNECTOR 

1. Remove the DCM (Telematics Transceiver) but do not disconnect the connectors. Refer to REMOVAL .
   Fig 5: Checking D73 DCM (Telematics Transceiver) Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   D73-12 (IND2) - Body ground	Always	10 kΩ or higher

   TEXT IN ILLUSTRATION
   
   

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

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Replace the DCM (Telematics Transceiver). Refer to REMOVAL .
   NOTE:

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

NEXT → See step   13