Mitsubishi 380. Manual - part 745

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54C-391

STEP 2. Check the CAN bus lines between joint connector 
(3) and the multi-center display unit . Measure the 
resistance between joint connector (3) C-02 and 
multi-center display unit  connector C-05.

CAUTION

A digital multimeter should be used. For details refer to 

P.54C-4

.

CAUTION

The test wiring harness should be used. For details refer to 

P.54C-4

.

(1) Disconnect joint connector (3) C-02 and multi-center display 

unit  connector C-05, and measure the resistance at the 
wiring harness sides of joint connector (3) C-02 and 
multi-center display unit  connector C-05.

(2) Turn the ignition switch to the "LOCK" (OFF) position.

CAUTION

Disconnect the negative battery terminal. For details refer 
to 

P.54C-4

.

(3) Disconnect the negative battery terminal.

16DB408A

CONNECTOR: C-02

16DB490A

CONNECTOR: C-05

HARNESS SIDE

C-05 (B)

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54C-392

(4) Measure the resistance between joint connector (3) 

terminal 8 and multi-center display unit  connector terminal 
13.

OK: 2 ohms or less

(5) Measure the resistance between joint connector (3) 

terminal 19 and multi-center display unit  connector terminal 
12.

OK: 2 ohms or less

CAUTION

Strictly observe the specified wiring harness repair proce-
dure. For details refer to 

P.54C-5

.

Q: Do all the resistances measure 2 ohms or less?

YES : If all the resistances measure 2 ohms or less, power 

supply to the multi-center display  may be suspected. 
Diagnose the multi-center display . Refer to GROUP 
54A, 

P.54A-284

.

NO :  If either of the resistances measures more than 2 

ohms or all the resistances measure more than 2 
ohms, repair the wiring harness between joint 
connector (3) and the multi-center display unit  
connector. 

AC204582

HARNESS SIDE: C-02

TEST 
HARNESS

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10 9

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20191817161514131211

TEST 
HARNESS

HARNESS SIDE: C-05

CJ

AC204582

HARNESS SIDE: C-02

CK

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20191817161514131211

HARNESS SIDE: C-05

TEST 
HARNESS

TEST 
HARNESS

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54C-393

DIAGNOSTIC ITEM 16: Diagnose the lines between CAN main bus line and the A/C-ECU.

CAUTION

When servicing a CAN bus line, ground yourself 
by touching a metal object such as an unpainted 
water pipe. If you fail to do so, a component con-
nected to the CAN bus line may be damaged.

.

TROUBLE JUDGMENT

If the MUT-III cannot received signals from the 
A/C-ECU, CAN bus line connector(s) are broken or 
an open circuit has occurred.

.

COMMENTS ON TROUBLE SYMPTOM

The wiring harness wire or connectors may have 
loose, corroded, or damage terminals, or terminals 
pushed back in the connector, or the A/C-ECU may 
be defective.

.

TROUBLESHOOTING HINTS

• Refer to circuit diagrams GROUP-

90

• Refer to configuration diagrams GROUP-

80

• The wiring harness or connectors may have 

loose, corroded, or damage terminals, or termi-
nals pushed back in the connector

• The A/C-ECU may be defective

16DB408A

CONNECTOR: C-02

16DB477A

C-15 HARNESS SIDE

CONNECTOR:  C-15

C-15 (B)

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54C-394

DIAGNOSIS

Required Special Tool:

• MB991223: Harness Set

STEP 1. Check joint connector (3) C-02 and A/C-ECU 
connector C-15 automatic air conditioning system for 
loose, corroded or damaged terminals, or terminals 
pushed back in the connector.

CAUTION

The strand end of the twisted wire should be within 10 cm 
(4 inches) from the connector. For details refer to 

P.54C-4

.

Check the joint connector at the wiring harness side for loose, 
corroded or damaged terminals, or terminals pushed back in 
the connector, and also check the short pin behind the connec-
tor for corrosion, deformation and delamination.

Q: Are joint connector (3) C-02 and A/C-ECU connector  

C-15 automatic air conditioning system in good 
condition?
YES : . Go to Step 2.
NO : . Repair the damaged parts. Replace the joint 

connector as necessary.

16DB408A

CONNECTOR: C-02

16DB477A

C-15 HARNESS SIDE

CONNECTOR:  C-15

C-15 (B)

AC209350

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12

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13

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AB

SHORT PIN