Emergency Call Switch Illumination Circuit [01/2020 - 10/2022]: Procedure

1. Disconnect the G131 DCM (telephone transceiver assembly) connector.
2. Disconnect the P20*1 or P14*2 map light sub-assembly (manual [SOS] switch) connector.
   1. *1: for TMC Made
   2. *1: for TMMC Made
3. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   FOR TMC MADE
   
   

   Tester Connection	Switch Condition	Specified Condition
   P20-24 (RRID) - Body Ground	Ignition switch ON	11 to 14 V

   FOR TMMC MADE AND W/O PANORAMIC MOON ROOF SYSTEM
   
   

   Tester Connection	Switch Condition	Specified Condition
   P14-2 (RRID) - Body Ground	Ignition switch ON	11 to 14 V

   FOR TMMC MADE AND W/ PANORAMIC MOON ROOF SYSTEM
   
   

   Tester Connection	Switch Condition	Specified Condition
   P14-20 (RRID) - Body Ground	Ignition switch ON	11 to 14 V

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

   Standard Resistance

   FOR TMC MADE
   
   

   Tester Connection	Condition	Specified Condition
   G131-3 (SIG-) - P20-14 (GND3)	Always	Below 1 Ω
   G131-3 (SIG-) or P20-14 (GND3) - Body ground	Always	10 kΩ or higher

   FOR TMMC MADE AND W/O PANORAMIC MOON ROOF SYSTEM
   
   

   Tester Connection	Condition	Specified Condition
   G131-3 (SIG-) - P14-10 (GND3)	Always	Below 1 Ω
   G131-3 (SIG-) or P14-10 (GND3) - Body ground	Always	10 kΩ or higher

   FOR TMMC MADE AND W/ PANORAMIC MOON ROOF SYSTEM
   
   

   Tester Connection	Condition	Specified Condition
   G131-3 (SIG-) - P14-12 (GND3)	Always	Below 1 Ω
   G131-3 (SIG-) or P14-12 (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	for TMC Made
   *B	for TMMC Made and w/o Panoramic Moon Roof System
   *C	for TMMC Made and w/ Panoramic Moon Roof System
   *a	Component without harness connected (Map Light Sub-assembly (Manual [SOS] Switch))

   Refer to REMOVAL [11/2018 - ]

2. Apply battery voltage to the connector.
   FOR TMC MADE
   
   

   Measurement Condition	Condition	Specified Condition
   Battery positive (+) → 24 (RRID) Battery negative (-) → 14 (GND3)	Always	Manual (SOS) switch illumination comes on

   FOR TMMC MADE AND W/O PANORAMIC MOON ROOF SYSTEM
   
   

   Measurement Condition	Condition	Specified Condition
   Battery positive (+) → 2 (RRID) Battery negative (-) → 10 (GND3)	Always	Manual (SOS) switch illumination comes on

   FOR TMMC MADE AND W/ PANORAMIC MOON ROOF SYSTEM
   
   

   Measurement Condition	Condition	Specified Condition
   Battery positive (+) → 20 (RRID) Battery negative (-) → 12 (GND3)	Always	Manual (SOS) switch illumination comes on

3. Check if the manual (SOS) switch illumination comes on.

   OK

   The manual (SOS) switch illumination comes on.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE MAP LIGHT SUB-ASSEMBLY (MANUAL (SOS) SWITCH). Refer to  REMOVAL [11/2018 - ] 

Result: 

OK 

See step  3

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

   Refer to REMOVAL [10/2019 - 10/2022]

   NOTE:

   • The ignition switch must be off.
   • Do not exchange the DCM (telephone transceiver assembly) with one from another vehicle.

   Result

   Proceed to
   NEXT

Result: 

NEXT 

PERFORM DCM ACTIVATION. Refer to  DCM ACTIVATION [10/2019 - 10/2022]