Inspection Procedure

NOTICE:

• Turn the ignition switch OFF before measuring the resistances of the CAN main wire and the CAN branch wire.

• After the ignition switch is turned off, check that the key reminder warning system and light reminder warning system are not in operation.

Before measuring the resistance, leave the vehicle as is for at least 1 minute and do not operate the ignition switch, any other switches or the doors. If doors need to be opened in order to check connectors, open the doors and leave them open. HINT:

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

CHECK CAN BUS LINE FOR DISCONNECTION (MAIN BODY ECU BRANCH WIRE)

Wire Harness Side:

Main Body ECU Connector

CANL

CANL

CANH

(a) Turn the ignition switch OFF.

(b) Disconnect the D33 main body ECU connector.

(c) Measure the resistance. Standard resistance

Tester Connection

Condition

Specified Condition

D33-23 (CANH) - D33-22 (CANL)

Ignition switch OFF

54 to 69 Q

REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO MAIN BODY ECU (CAN-H, CAN-L)

CHECK HARNESS AND CONNECTOR (BECU, IG, GND1)

Wire Harness Side:

Main Body ECU Connector

BECU

G100284E03

(a) Disconnect the 4B and 4E main body ECU connectors.

(b) Measure the resistance. Standard resistance

(d) Reconnect the main body ECU connectors.

Tester Connection

Condition

Specified Condition

4E-17 (GND1) - Body ground

Always

Below 1 Q

(c) Measure the voltage. Standard voltage

Tester Connection

Condition

Specified Condition

4B-30 (BECU) - Body ground

Always

11 to 14 V

Main Body ECU Rear Side:

Main Body ECU Connector

IG

C127390E01

(e) Measure the voltage. Standard voltage

Tester Connection

Condition

Specified Condition

4B-24 (IG) - Body ground

Ignition switch ON

11 to 14 V

REPAIR OR REPLACE HARNESS OR CONNECTOR

REPLACE MAIN BODY ECU

Do It Yourself Car Diagnosis

Do It Yourself Car Diagnosis

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