Diagnosis Procedure

1. Turn the ignition switch OFF.
2. Disconnect the battery cable from the negative terminal.
3. Check the following terminals and connectors for damage, bend and loose connection (unit side and connector side).
   • TCU
   • CAN gateway

Is the inspection result normal?

YES 

GO TO STEP 2  .

NO 

Repair the terminal and connector.

1. Disconnect the connector of CAN gateway.
2. Check the continuity between the CAN gateway harness connector terminals.

   CAN gateway harness connector				Continuity
   Connector No.	Terminal No.	Connector No.	Terminal No.
   M218	20	M217	9	Existed
   	19		3	Existed

Is the inspection result normal?

YES 

GO TO STEP 3  .

NO 

Check the harness and repair the root cause (Multifunction media CAN communication circuit).

1. Connect the connector of CAN gateway.
2. Disconnect the connector of TCU.
3. Check the resistance between the TCU harness connector terminals.

   TCU harness connector			Resistance (Ω)
   Connector No.	Terminal No.
   M215	6	7	Approx. 54 - 66

Is the measurement value within the specification?

YES 

GO TO STEP 4  .

NO 

Repair the TCU branch line.

Check the power supply and the ground circuit of the TCU. Refer to DIAGNOSIS PROCEDURE .

Is the inspection result normal?

YES (Present error) 

Replace the TCU. Refer to REMOVAL AND INSTALLATION .

YES (Past error) 

Error was detected in the TCU branch line.

NO 

Repair the power supply and the ground circuit.