DTC U0327: Software Incompatibility with Vehicle Security Control Module: Procedure

1. Check for DTCs.

   HINT: 

   If the CAN MS bus communication error DTC U1002 is output, troubleshoot for U1002 and check for malfunctions in the CAN MS main bus circuit. Refer to DTC U1002 (CAN MS BUS): Lost Communication with Gateway Module (Main body ECU) .

   Result

   Result	Proceed to
   U1002 is not output	A
   U1002 is output	B

B → See step   4 

A: Go to next step 

1. Turn the ignition switch off.
2. Disconnect the connector from the certification ECU.
   Fig 1: Checking CAN MS Bus Wire (Certification ECU)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Measure the resistance according to the value(s) in the table below.

   Standard resistance

   Tester Connection	Condition	Specified Condition
   D40-27 (CANH) - D40-28 (CANL)	Ignition switch off	108 to 132 Ω

NG → REPAIR OR REPLACE CAN MS BUS BRANCH WIRE OR CONNECTOR (CERTIFICATION ECU) 

OK: Go to next step 

1. Measure the resistance according to the value(s) in the table below.
   Fig 2: Checking Harness And Connector (Power Source Circuit)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard resistance

   Tester Connection	Condition	Specified Condition
   D40-17 (E) - Body ground	Always	Below 1 Ω

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

   Standard voltage

   Tester Connection	Condition	Specified Condition
   D40-18 (IG) - Body ground	Ignition switch on (IG)	10 to 14 V
   D40-1 (+B) - Body ground	Always	10 to 14 V
   D40-19 (ACC) - Body ground	Ignition switch on (ACC)	10 to 14 V

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → REPLACE CERTIFICATION ECU