Emergency Call Switch Illumination Circuit [10/2019 - ]: Procedure

1. Disconnect the G128 DCM (telematics transceiver) connector.
2. Disconnect the P12 map light sub-assembly (manual (SOS) switch) connector.
3. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   P12-5 (RRID) - Body Ground	Power switch on (IG)	11 to 14 V

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   G128-3 (SIG-) - P12-9 (GND3)	Always	Below 1 Ω
   G128-3 (SIG-) or P12-9 (GND3) - Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  2

1. Remove the map light sub-assembly (manual (SOS) switch).

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Component without harness connected (Map light sub-assembly (Manual (SOS) Switch))

   Refer to REMOVAL [06/2018 - ]

2. Apply auxiliary battery voltage to the connector and check that the manual (SOS) switch illumination comes on.

   OK

   Measurement Condition	Condition	Specified Condition
   Auxiliary battery positive (+) → P12-5 (RRID) Auxiliary battery negative (-) → P12-9 (GND3)	Always	Manual (SOS) switch illumination cones on

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE MAP LIGHT SUB-ASSEMBLY (MANUAL (SOS) SWITCH). Refer to  REMOVAL [06/2018 - ] 

Result: 

OK 

See step  3

1. Replace the DCM (telematics transceiver) with a new one.

   Refer to REMOVAL [10/2019 - 08/2020] , or refer to REMOVAL [08/2020 - 09/2022] , or refer to REMOVAL [09/2022 - ]

   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 [10/2019 - ]