Dtc U0327 Software Incompatibility With Vehicle Security Control Module

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

PRECAUTION

DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL

CHECK FOR OPEN IN CAN BUS WIRE (CERTIFICATION ECU CAN BRANCH WIRE)

CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - BATTERY AND BODY GROUND)

DESCRIPTION

1. For vehicles with an entry and start system.
   

WIRING DIAGRAM

INSPECTION PROCEDURE

NOTICE:

Inspect the fuses for circuits related to this system before performing the following inspection procedure.

HINT:

Operating the ignition switch, any switches or any doors triggers related ECU and sensor communication with the CAN, which causes resistance variation.

NOTICE:

After turning the ignition switch off, waiting time may be required before disconnecting the cable from the battery terminal. Therefore, make sure to read the disconnecting the cable from the battery terminal notice before proceeding with work (Click here).

1. Disconnect the cable from the negative (-) battery terminal before measuring the resistances of the main wire and the branch wire.
   

   CAUTION:

   For vehicles with an SRS system:

   Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

   NOTICE:

   When disconnecting the cable, some systems need to be initialized after the cable is reconnected (Click here).

1. Disconnect the E29 certification ECU (smart key ECU assembly) connector.
   

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

   Standard Resistance:

   Tester Connection	Switch Condition	Specified Condition
   E29-27 (CANH) - E29-28 (CANL)	Ignition switch off	54 to 69 Ω

   Text in Illustration

   *a	Front view of wire harness connector (to Certification ECU [Smart Key ECU Assembly])

1. Connect the cable to the negative (-) battery terminal.
   

   NOTICE:

   When disconnecting the cable, some systems need to be initialized after the cable is reconnected (Click here).

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

   Standard Resistance:

   Tester Connection	Condition	Specified Condition
   E29-17 (E) - Body ground	Always	Below 1 Ω

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

   Standard Voltage:

   Tester Connection	Condition	Specified Condition
   E29-1(+B) - Body ground	Always	11 to 14 V
   E29-19 (ACC) - Body ground	Ignition switch ACC	11 to 14 V
   E29-18 (IG) - Body ground	Ignition switch ON	11 to 14 V