DTC U0182: Lost Communication with AFS ECU [06/2015 - 11/2018]: 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
   U1002 is not output from main body ECU (multiplex network body ECU) (Techstream display: Main Body)	A
   U1002 is output from main body ECU (multiplex network body ECU) (Techstream display: Main Body)	B

Result: 

B 

GO TO DIAGNOSIS PROCEDURE INDICATED BY OUTPUT DTC. Refer to  DTC U1002: Lost Communication with Gateway Module (Network Gateway ECU) [06/2015 - 11/2018]  

Result: 

A 

See step  2

1. Disconnect the cable from the negative (-) auxiliary battery terminal.
2. Disconnect the headlight light control ECU sub-assembly LH connector.
3. 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 Headlight Light Control ECU Sub-assembly LH)

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   A31-24 (CANH) - A31-23 (CANL)	Cable disconnected from negative (-) auxiliary battery terminal	54 to 69 Ω

   Result

   Result
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE CAN BRANCH LINE OR CONNECTOR (HEADLIGHT LIGHT CONTROL ECU SUB-ASSEMBLY LH) 

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 Headlight Light Control ECU Sub-assembly LH)

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   A31-12 (GND) - Body ground	Cable disconnected from negative (-) auxiliary battery terminal	Below 1 Ω

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

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   A31-13 (ECUB) - Body ground	Power switch on (IG)	11 to 14 V
   A31-4 (IG) - Body ground	Power switch on (IG)	11 to 14 V

   Result

   Result
   OK
   NG

Result: 

OK 

REPLACE HEADLIGHT LIGHT CONTROL ECU SUB-ASSEMBLY LH. Refer to  REMOVAL [06/2015 - ] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)