DTC U1110: Lost Communication with Clearance Sonar Module [10/2014 - 09/2017]: Procedure

1. Check for DTCs.

   Body Electrical > HV Gateway > Trouble Codes 

   HINT: 

   If DTC U1002 is output from the gateway of the hybrid vehicle control ECU, this indicates a sub bus 11 malfunction. Troubleshoot for DTC U1002 and check for malfunctions in sub bus 11.

   Result

   Result	Proceed to
   U1002 is not output from hybrid vehicle control ECU	A
   U1002 is output from hybrid vehicle control ECU	B

Result: 

B 

GO TO DIAGNOSIS PROCEDURE INDICATED BY OUTPUT DTC. Refer to  DTC U1002: Lost Communication with Gateway Module [10/2014 - 09/2017]  

Result: 

A 

See step  2

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

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Rear view of wire harness connector (to Clearance Warning ECU Assembly)

2. Disconnect the clearance warning ECU assembly connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   I20-17 (R1) - I20-18 (R2)	Cable disconnected from negative (-) auxiliary battery terminal	54 to 69 Ω

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE CAN BRANCH WIRE OR CONNECTOR (CLEARANCE WARNING ECU ASSEMBLY) 

Result: 

OK 

See step  3

1. Reconnect the cable to the negative (-) auxiliary battery terminal.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Rear view of wire harness connector (to Clearance Warning ECU Assembly)

   NOTE:

   When disconnecting the cable, some systems need to be initialized after the cable is reconnected.

   Refer to INITIALIZATION [10/2014 - 09/2017]

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

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   I20-12 (IG) - Body ground	Power switch on (IG)	11 to 14 V

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   I20-27 (E) - Body ground	Always	Below 1 Ω

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE CLEARANCE WARNING ECU ASSEMBLY. Refer to  REMOVAL [10/2014 - 05/2019] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR