DTC U023A: Lost Communication with Front Camera Module [02/2014 - 11/2016]: Procedure

Body Electrical > PM1 Gateway > Trouble Codes 

1. Reconfirm DTCs.

   HINT: 

   If DTC U1002 is output from PM1 Gateway of the power management 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
   DTC U1002 is not output from power management control ECU (Techstream display: PM1 Gateway)	A
   DTC U1002 is output from power management control ECU (Techstream display: PM1 Gateway)	B

Result: 

B 

GO TO DIAGNOSIS PROCEDURE INDICATED BY OUTPUT DTC. Refer to  DTC U1002: Lost Communication with Gateway Module (Power Management1) [02/2014 - 11/2016]  

Result: 

A 

See step  2

1. Disconnect the cable from the negative (-) auxiliary battery terminal.
2. Disconnect the S4 lane departure warning camera 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 Lane Departure Warning Camera)

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   S4-6 (CA1P) - S4-12 (CA1N)	Cable disconnected from negative (-) auxiliary battery terminal	54 to 69 Ω

Result: 

NG 

REPAIR OR REPLACE CAN BRANCH LINE OR CONNECTOR (LANE DEPARTURE WARNING CAMERA) 

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 Lane Departure Warning Camera)

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   S4-11 (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.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Front view of wire harness connector (to Lane Departure Warning Camera)

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   S4-7 (IGB) - Body ground	Power switch on (IG)	11 to 14 V

Result: 

OK 

REPLACE LANE DEPARTURE WARNING CAMERA. Refer to  REMOVAL [02/2014 - 11/2016] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)