DTC U0198: Lost Communication with Telematic Control Module [09/2014 - 10/2015]: Procedure

1. *1: w/o Dynamic Rear Steering System
2. *2: w/ Dynamic Rear Steering System

1. Reconfirm DTCs.

   HINT: 

   If DTC U1002 is output from Gateway of the network gateway ECU, this indicates a sub bus 2/sub bus 18*2 malfunction. Troubleshoot for DTC U1002 and check for malfunctions in sub bus 2*1/sub bus 18*2.

   RESULT
   
   

   Result	Proceed to
   DTC U1002 is not output from network gateway ECU.	A
   DTC U1002 is output from network gateway ECU (Sub Bus 2*1/Sub Bus 18*2).	B

Result: 

B 

GO TO DIAGNOSIS PROCEDURE INDICATED BY OUTPUT DTC 

(Refer to DTC U1002: Lost Communication with Gateway Module (Network Gateway ECU) [09/2014 - 10/2015] )

Result: 

A 

See step  2

1. Disconnect the cable from the negative (-) battery terminal.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

2. Disconnect the DCM (telematics transceiver) connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   N87-15 (CANP) - N78-16 (CANN)	Cable disconnected from negative (-) battery terminal	54 to 69 Ω

   TEXT IN ILLUSTRATION
   
   

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

Result: 

NG 

REPAIR OR REPLACE DCM [TELEMATICS TRANSCEIVER] CAN BRANCH WIRE OR CONNECTOR (CANP, CANN) 

Result: 

OK 

See step  3

1. Connect the cable to the negative (-) battery terminal.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   NOTE:

   When connecting the cable, some systems need to be initialized after the cable is reconnected (Refer to INITIALIZATION [09/2014 - 10/2015] ).

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

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   N87-1 (+B) - Body ground	Always	11 to 14 V
   N87-7 (IG2) - Body ground	Engine switch on (IG)	11 to 14 V
   N87-8 (ACC) - Body ground	Engine switch on (ACC)	11 to 14 V

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   N87-4 (E) - Body ground	Always	Below 1 Ω

   TEXT IN ILLUSTRATION
   
   

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

Result: 

OK 

REPLACE DCM [TELEMATICS TRANSCEIVER] 

(Refer to REMOVAL [09/2014 - 09/2017] )

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR