2004 MITSUBISHI ENDEAVOR wiring

If DTC B1001 or B1002 is stored as a past trouble, carry out diagnosis with
particular emphasis on wiring and connector(s) between the A/C-ECU and the
interior air temperature sensor. If the connectors and wiring are normal, and
obviously the ECU is the cause of the trouble, replace the ECU. If in doubt, do
not replace the ECU.
TROUBLESHOOTING HINT
Malfunction of connector. Malfunction of the harness. Malfunction of the interior temperature sensor. Malfunction of the A/C-ECU.
DIAGNOSIS Required Special Tools:

MB991223: Harness Set MB991958: Scan Tool (MUT-III Sub Assembly)
MB991824: Vehicle Communication Interface (V.C.I.) MB991827: MUT-III USB Cable MB991910: MUT-III Main Harness A (Vehicles with CAN
communication system)
STEP 1. Using scan tool MB991958, diagnose the CAN bus line.

Use scan tool MB991958 to diagnose the CAN bus lines.
1. Connect scan tool MB991958 to the data link connector.
2. Turn the ignition switch to "ON" position.
3. Diagnose the CAN bus line.

2004 Mitsubishi Endeavor LS
2004 HVAC Automatic Air Conditioning - Endeavor

Fig. 13: Identifying Connector C
-120

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

Q: Are A/C-ECU connector C-16, C-17 and interior temperature sensor
connector C-120 in good condition?

YES:
Go to Step 5.
NO:
Repair or replace the connector. Refer to
HARNESS
CONNECTOR INSPECTION
. Then go to Step 7 .
STEP 5. Check the wiring harness between A/C-ECU connector C-16
(terminals 20), C-17 (terminals 22) and interior temperature sensor
connector C-120 (terminals 1 and 2)
.

2004 Mitsubishi Endeavor LS
2004 HVAC Automatic Air Conditioning - Endeavor

Fig. 15: Identifying Connectors C
-104 And C
-120

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

Q: Are the wiring harnesses between A/C-ECU connector C-16 (terminals
20), C-17 (terminals 22) and interior temperature sensor connector C-120
(terminals 1 and 2) in good condition?

YES:
Go to Step 6.
NO:
Repair the wiring harness. Then go to Step 7 .
STEP 6. Check the interior temperature sensor.

1. Disconnect interior tem
perature sensor connector C-120.
NOTE: Also check joint connector C-104 for loose, corroded,
or damaged terminals, or terminals pushed back in the
connector. If joint connector C-104 is damaged, repair
or replace the connector as described in HARNESS
CONNECTOR INSPECTION
.

2004 Mitsubishi Endeavor LS
2004 HVAC Automatic Air Conditioning - Endeavor

Fig. 25: Identifying Connectors C
-31 And C
-104

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

CIRCUIT OPERATION If the rear blower motor does not operate, the rear blower relay system is suspected.TROUBLESHOOTING HINTS
Malfunction of the rear blower relay Malfunction of the resistor Malfunction of the rear blower motor Malfunction of the A/C-ECU The wiring harness or connectors may have loose, corroded, or damaged
terminals, or terminals pushed back in the connector
DIAGNOSIS
2004 Mitsubishi Endeavor LS
2004 HVAC Automatic Air Conditioning - Endeavor

1. Disconnect rear blower motor connector C-20, and measure the voltage at
the wiring harness side.
2. Turn the ignition switch to the "ON" position.
3. Turn the blower speed selection dial to the "MAX" position.
4. Turn the mode selection dial to the "Face" position.
5. Turn the rear blower switch to the "ON" position.
Fig. 27: Identifying Connector C
-20
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

6. Measure the voltage between terminal 3 and ground.
The measured value should be approximately 12 volts (battery positive volta
ge).

2004 Mitsubishi Endeavor LS
2004 HVAC Automatic Air Conditioning - Endeavor

Fig. 33: Identifying Connector C
-16
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

Q: Is A/C-ECU connector C-16 in good condition?

YES:
Go to Step 7.
NO:
Repair or replace the connector. Refer to
HARNESS
CONNECTOR INSPECTION
. The rear blower motor should operate
normally.
STEP 7. Check the wiring harness between A/C-ECU connector C-16
(terminal 7) and rear blower relay connector C-209 (terminal 3).

2004 Mitsubishi Endeavor LS
2004 HVAC Automatic Air Conditioning - Endeavor

Fig. 36: Identifying Connector C
-104

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

Q: Is the wiring harness between A/C-ECU connector C-16 (terminal 7)
and rear blower relay connector C-209 (terminal 3) in good condition?

YES:
Replace the A/C-ECU, and check that the rear blower motor should
operate normally.
NO:
Repair the wiring harness. The rear blower motor should operate
normally.
STEP 8. Measure the voltage at rear blower relay connector C-209.

1. Disconnect rear blower relay connector C-209, and measure the voltage at
the
junction block side.

2004 Mitsubishi Endeavor LS
2004 HVAC Automatic Air Conditioning - Endeavor

Fig. 38: Measuring Voltage Between Terminal 4 And Ground

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

Q: Is the measured voltage approximately 12 volts?

YES:
Go to Step 10 .
NO:
Go to Step 9.
STEP 9. Check the wiring harness between rear blower relay connector C-
209 (terminal 4) and fusible link (1).

2004 Mitsubishi Endeavor LS
2004 HVAC Automatic Air Conditioning - Endeavor