Page 2089 of 3870
Fig. 64: Air Mixing Damper Control Motor Circuit Diagram
2004 Mitsubishi Endeavor LS
2004 HVAC Heater Air Conditioning, Ventilation - Endeavor
Page 2090 of 3870
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA
.
Fig. 65: Identifying Connectors C
-16 And C
-109
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
DTC SET CONDITION
If the air mixing damper control motor does not work normally, DTC
No.B1045 will be set.
TECHNICAL DESCRIPTION (COMMENT)
CURRENT TROUBLE
2004 Mitsubishi Endeavor LS
2004 HVAC Heater Air Conditioning, Ventilation - Endeavor
Page 2091 of 3870

The A/C-ECU, the air mixing damper control motor and potentiometer, or
connector(s) or wiring between the two may be defective.
PAST TROUBLE
If DTC B1045 is stored as a past trouble, carry out diagnosis with particular
emphasis on wiring and connector(s) between the A/C-ECU and the air mixing
damper control motor and potentiometer. 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 air mixing damper control motor and potentiometer. Malfunction of the A/C-ECU.
DIAGNOSIS REQUIRED SPECIAL TOOL:
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 connec
tor.
2004 Mitsubishi Endeavor LS
2004 HVAC Heater Air Conditioning, Ventilation - Endeavor
Page 2092 of 3870
Fig. 66: Connectin
g Scan Tool (MB991958) To Data Link Connector
2004 Mitsubishi Endeavor LS
2004 HVAC Heater Air Conditioning, Ventilation - Endeavor
Page 2093 of 3870

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA
.
2. Turn the ignition switch to "ON" position.
3. Diagnose the CAN bus line.
Q: Is the check result satisfactory?
YES:
Go to Step 2.
NO:
Repair the CAN bus lines (Refer to
CAN BUS DIAGNOSTICS
TABLE
). Then go to Step 7 .
STEP 2. Recheck for diagnostic trouble code.
Recheck if the DTC is set.
1. Erase the DTC.
2. Turn the ignition switch to "ON" position.
3. Check if the DTC is set.
Q: Is the check result satisfactory?
YES:
It can be assumed that this malfunction is intermittent. Refer to
HOW TO USE TROUBLESHOOTING/ INSPECTION SERVICE POINTS
.
NO:
Go to Step 3.
STEP 3. Usin
g scan tool MB991958, check data list item 10, 11, 12: air mix
damper motor.
1. Connect scan tool MB991958 to the data link connec
tor.
CAUTION: To prevent damage to scan tool MB991958,
always turn the ignition switch to the
"LOCK" (OFF) position before connecting or
disconnecting scan tool MB991958.
2004 Mitsubishi Endeavor LS
2004 HVAC Heater Air Conditioning, Ventilation - Endeavor
Page 2094 of 3870
Fig. 67: Connectin
g Scan Tool MB991958 To Data Link Connector
2004 Mitsubishi Endeavor LS
2004 HVAC Heater Air Conditioning, Ventilation - Endeavor
Page 2095 of 3870

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA
.
2. Start the engine.
3. Check the data list.
4. Use scan tool MB991958 to run the actuator test.
Item 10: air mix damper motor (MAX COOL position)
Item 11: air mix damper motor (middle position)
Item 12: air mix damper motor (MAX HOT position)
Check that the air mixing damper control motor operates.
5. Turn the ignition switch to the "LOCK" (OFF) position.
Q: Does the motor operate normally?
YES:
Replace the A/C-ECU. Then go to Step 7 .
NO:
Go to Step 4.
STEP 4. Check A/C-ECU connectors C-16 and air mixing damper control
motor and potentiometer connector C-109 for loose, corroded or damaged
terminals, or terminals pushed back in the connector.
Q: Are A/C-ECU connectors C-16 and air mixing damper control motor
and potentiometer connector C-109 in good condition?
YES:
Go to Step 5.
NO:
Repair or replace the connector. Refer to
HARNESS
CONNECTOR INSPECTION
. Then
go to Ste
p 7 .
2004 Mitsubishi Endeavor LS
2004 HVAC Heater Air Conditioning, Ventilation - Endeavor
Page 2096 of 3870
Fig. 68: Locating Connectors C
-16 And C
-109
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
2004 Mitsubishi Endeavor LS
2004 HVAC Heater Air Conditioning, Ventilation - Endeavor