DTC U0199: Lost Communication with "Door Control Module A" [09/2014 - 11/2017]: Procedure

Body Electrical > Main Body > Trouble Codes 

1. Reconfirm DTCs.

   HINT: 

   If DTC U1002 is output from Main Body of the main body ECU (multiplex network body ECU), this indicates a sub bus 1 malfunction. Troubleshoot for DTC U1002 and check for malfunctions in sub bus 1.

   Result

   Result	Proceed to
   DTC U1002 is not output from main body ECU (multiplex network body ECU) (Techstream display: Main Body)	A
   DTC U1002 is output from main body ECU (multiplex network body ECU) (Techstream display: Main Body)	B

Result: 

B 

GO TO DIAGNOSTIC PROCEDURE INDICATED BY OUTPUT DTC. Refer to  DTC U1002: Lost Communication with Gateway Module (Main Body ECU) [09/2014 - 11/2017] 

Result: 

A 

See step  2

1. Disconnect the cable from the negative (-) battery terminal.
2. Disconnect the R12 outer mirror control ECU assembly (for front passenger side) connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Front view of wire harness connector (to Outer Mirror Control ECU Assembly (for Front Passenger Side))

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   R12-9 (CANP) - R12-8 (CANN)	Cable disconnected from negative (-) battery terminal	54 to 69 Ω

   Result

   Result
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE CAN BRANCH LINES OR CONNECTOR (OUTER MIRROR CONTROL ECU ASSEMBLY (FOR FRONT PASSENGER SIDE)) 

Result: 

OK 

See step  3

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

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Front view of wire harness connector (to Outer Mirror Control ECU Assembly (for Front Passenger Side))

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   R12-7 (GND) - Body ground	Cable disconnected from negative (-) battery terminal	Below 1 Ω

2. Reconnect the cable to the negative (-) battery terminal.
3. Measure the voltage according to the value(s) in the table below.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Front view of wire harness connector (to Outer Mirror Control ECU Assembly (for Front Passenger Side))

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   R12-5 (SIG) - Body ground	Engine switch on (IG)	11 to 14 V
   R12-6 (CPUB) - Body ground	Always	11 to 14 V
   R12-14 (BDR) - Body ground	Always	11 to 14 V

   Result

   Result
   OK
   NG

Result: 

OK 

REPLACE OUTER MIRROR CONTROL ECU ASSEMBLY (FOR FRONT PASSENGER SIDE). Refer to  REMOVAL [09/2014 - ] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)