Inspection Procedure

NOTICE:

• Turn the ignition switch off before measuring the resistance of the CAN main wire and CAN branch wires.

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

• 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 other switches or any triggers related ECU and sensor communication on the CAN, which would cause resistance reading variations.

CHECK CAN BUS LINE FOR DISCONNECTION (AIR CONDITIONING AMPLIFIER BRANCH WIRE)

Air Conditioning Amplifier (Wire Harness Side):

CANL

CANH

(a) Turn the ignition switch off.

(b) Disconnect the air conditioning amplifier connector.

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

Standard resistance

Tester Connection

Condition

Specified Condition

E38-11 (CANH) - E38-12 (CANL)

Ignition Switch off

54 to 69 Q

NG REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO AIR CONDITIONING AMPLIFIER (CAN-H, CAN-L)

CHECK HARNESS AND CONNECTOR (IG+, B, GND)

Air Conditioning Amplifier (Wire Harness Side):

(a) Disconnect the air conditioning amplifier connector.

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

Standard resistance

Tester Connection

Condition

Specified Condition

E38-14 (GND) - Body Ground

Always

Below 1 Q

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

Tester Connection

Condition

Specified Condition

E38-1 (IG+) - Body Ground

Ignition Switch on (IG)

10 to 14 V

E38-21 (B)- Body Ground

Always

10 to 14 V

REPAIR OR REPLACE HARNESS OR CONNECTOR

REPLACE AIR CONDITIONING AMPLIFIER

Do It Yourself Car Diagnosis

Do It Yourself Car Diagnosis

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