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 (connector side and harness side).
   • Harness connector M40
   • Harness connector B69

Is the inspection result normal?

YES

GO TO 2.

NO

Repair the terminal and connector.

1. Disconnect the following harness connectors.
   • 3CH CAN gateway
   • Harness connectors M40 and B69
2. Check the continuity between the 3CH CAN gateway harness connector and the harness connector.

   3CH CAN gateway harness connector		Harness connector		Continuity
   Connector No.	Terminal No.	Connector No.	Terminal No.
   M6	1	M40	89A	Existed
   	2		90A	Existed

Is the inspection result normal?

YES

GO TO 3.

NO

Repair the main line between the 3CH CAN gateway and the harness connector M40.

1. Disconnect the connector of automatic back door control module.
2. Check the continuity between the harness connector and the automatic back door control module harness connector.

Is the inspection result normal?

YES

Check CAN system type decision again.

YES

Error was detected in the main line between the 3CH CAN gateway and the automatic back door control module.

NO

Repair the main line between the harness connector B69 and the automatic back door control module.