DTC B15C6: Ignition Switch Signal Malfunction [01/2018 - ]: Procedure

1. Clear the DTCs.

   Refer to DTC CHECK / CLEAR [06/2015 - ]

   Body Electrical > Navigation System > Clear DTCs 

2. Recheck for DTCs and check if the same DTC is output again.

   Refer to DTC CHECK / CLEAR [06/2015 - ]

   Body Electrical > Navigation System > Trouble Codes 

   Result

   Result	Proceed to
   B15C6 is not output.	A
   B15C6 is output.	B

Result: 

A 

USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [06/2015 - 11/2018]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [11/2018 - ] 

Result: 

B 

See step  2

1. Disconnect the DCM (Telematics Transceiver) connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Front view of wire harness connector (to DCM [Telematics Transceiver])

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   G55-4 (E) - Body ground	Always	Below 1 Ω

3. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   G55-7 (IG2) - Body ground	Power switch on (IG)	11 to 14 V

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  3

1. Replace the DCM (Telematics Transceiver).

   Refer to REMOVAL [01/2018 - 11/2018] , or refer to REMOVAL [11/2018 - ]

   NOTE:

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

   Result

   Proceed to
   NEXT

Result: 

NEXT 

PERFORM DCM ACTIVATION. Refer to  DCM ACTIVATION [01/2018 - ]