2004 MITSUBISHI ENDEAVOR ECU

correctly, reconnect correctly. Go to step 9 .
5. Disconnect negative battery cable. Disconnect, then reconnect SRS ECU
connector C-25 and passenger side impact air bag module connector D-31. See
SIDE IMPACT AIR BAG MODULE
under REMOVAL &
INSTALLATION. Connect negative battery cable. Using scan tool, erase, then
retrieve DTCs. If DTC B1420 is retrieved, go to next step. If DTC B1420 is
not retrieved, intermittent condition may have existed.
6. Disconnect negative battery cable. Disconnect passenger side impact air bag
module connector D-31. Connect Load Resistor (MB991865) to Load Resistor
Adapter (MB991866). Insert load resistor adapter leads into harness-side
terminals No. 1 (Yellow wire) and No. 2 (Yellow/Black wire) of connector D-
31. See Fig. 36
. Connect negative battery cable. Erase, then retrieve DTCs. If
DTC B1420 is retrieved, go to next step. If DTC B1420 is not retrieved,
replace passenger side impact air bag module.
7. Disconnect negative battery cable. Remove load resistor and load resistor
adapter from passenger side impact air bag module connector D-31.
Disconnect SRS ECU connector C-25. Release SRS ECU connector shorting
bar using a cable tie. Measure resistance between SRS ECU connector
terminals No. 58 (Yellow wire) and No. 57 (Yellow/Black wire). See Fig. 33
.
If continuity exits, go to next step. If continuity does not exist, reconnect SRS
components. Erase, then retrieve DTCs. If DTC B1420 is retrieved, replace
SRS ECU. Go to step 9 .
8. Replace wire harness between SRS ECU and passenger side impact air bag
module. Go to next step.
9. Reconnect all SRS components. Activate air bag system. Using scan tool,
retrieve DTCs. If DTC B1420 is retrieved, go to step 1 . If DTC B1420 is not
retrieved, s
ystem is normal at this time.

2004 Mitsubishi Endeavor Limited
2004 ACCESSORIES/SAFETY EQUIPMENT Mitsubishi - Air Bag Restraint Systems

Fig. 36: Identifying Connector D
-26 & D
-31 Terminals

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
DTC B1421: SIDE IMPACT AIR BAG MODULE (RH) OPEN CIRCUIT 1. Connect scan tool to Data Link Connector (DLC). See INITIAL SRS
DIAGNOSTIC PROCEDURE
under DIAGNOSTICS. If scan tool is able to
diagnose CAN bus lines and CAN bus lines are satisfactory, go to next step. If
scan tool cannot diagnose CAN bus lines, repair CAN bus lines. Go to next
step.
2. Erase, then retrieve DTCs. Turn ignition off. If DTC B1421 is retrieved, go to
next step. If DTC B1421 is not retrieved, an intermittent condition may exist.
3. Disconnect negative battery cable. Disconnect passenger side impact air bag
module connector D-31. See SIDE IMPACT AIR BAG MODULE
under
REMOVAL & INSTALLATION. See Fig. 30
. Connect Load Resistor
(MB991865) to Load Resistor Adapter (MB991866). Insert load resistor
adapter leads into harness-side terminals No. 1 (Yellow wire) and No. 2
(Yellow/Black wire) of connector D-31. See Fig. 36
. Connect negative battery
cable. Erase, then retrieve DTCs. If DTC B1421 is retrieved, go to next step. If
DTC B1421 is not retrieved, replace passenger side impact air bag module.
4. Disconnect negative battery cable. Remove load resistor and load resistor
adapter from passenger side impact air bag module connector D-31.
Disconnect SRS ECU connector
C-25. See SRS ELECTRONIC CONTROL

2004 Mitsubishi Endeavor Limited
2004 ACCESSORIES/SAFETY EQUIPMENT Mitsubishi - Air Bag Restraint Systems

UNIT (SRS ECU)
under REMOVAL & INSTALLATION. Release SRS ECU
connector shorting bar using a cable tie. Measure resistance of Yellow wire
between SRS ECU connector C-25, terminal No. 58 and terminal No. 1 of
connector D-31. See Fig. 33
. Measure resistance of Yellow/Black wire
between SRS ECU connector C-25, terminal No. 57 and terminal No. 2 of
connector D-31. If resistance is 2 ohms or more in each wire, go to next step. If
resistance is less than 2 ohms in each wire, reconnect SRS components. Erase,
then retrieve DTCs. If DTC B1421 is retrieved, replace SRS ECU. Go to step
6 .
5. Replace wire harness between SRS ECU and passenger side impact air bag
module. Go to next step.
6. Reconnect all SRS components. Activate air bag system. Using scan tool,
retrieve DTCs. If DTC B1421 is retrieved, go to step 1 . If DTC B1421 is not
retrieved, system is normal at this time.
DTC B1422: SIDE IMPACT AIR BAG MODULE (RH) SHORT TO VOLTAGE 1. Connect scan tool to Data Link Connector (DLC). See INITIAL SRS
DIAGNOSTIC PROCEDURE
under DIAGNOSTICS. If scan tool is able to
diagnose CAN bus lines and CAN bus lines are satisfactory, go to next step. If
scan tool cannot diagnose CAN bus lines, repair CAN bus lines. Go to next
step.
2. Erase, then retrieve DTCs. Turn ignition off. If DTC B1422 is retrieved, go to
next step. If DTC B1422 is not retrieved, an intermittent condition may exist.
3. Disconnect negative battery cable. Disconnect passenger side impact air bag
module connector D-31. See SIDE IMPACT AIR BAG MODULE
under
REMOVAL & INSTALLATION. See Fig. 30
. Connect Load Resistor
(MB991865) to Load Resistor Adapter (MB991866). Insert load resistor
adapter leads into harness-side terminals No. 1 (Yellow wire) and No. 2
(Yellow/Black wire) of connector D-31. See Fig. 36
. Connect negative battery
cable. Erase, then retrieve DTCs. If DTC B1422 is retrieved, go to next step. If
DTC B1422 is not retrieved, replace passenger side impact air bag module.
4. Disconnect negative battery cable. Remove load resistor and load resistor
adapter from passenger side impact air bag module connector D-31.
Disconnect SRS ECU connector
C-25. See SRS ELECTRONIC CONTROL

2004 Mitsubishi Endeavor Limited
2004 ACCESSORIES/SAFETY EQUIPMENT Mitsubishi - Air Bag Restraint Systems

UNIT (SRS ECU)
under REMOVAL & INSTALLATION. Release SRS ECU
connector shorting bar using a cable tie. Measure voltage between ground and
SRS ECU connector C-25, terminal No. 58 (Yellow wire). See Fig. 33
.
Measure voltage between ground and SRS ECU connector C-25, terminal No.
57 (Yellow/Black wire). If voltage is measured at either terminal, go to next
step. If voltage is not measured at both terminals, reconnect SRS components.
Erase, then retrieve DTCs. If DTC B1422 is retrieved, replace SRS ECU. Go to
step 6 .
5. Replace wire harness between SRS ECU and passenger side impact air bag
module. Go to next step.
6. Reconnect all SRS components. Activate air bag system. Using scan tool,
retrieve DTCs. If DTC B1422 is retrieved, go to step 1 . If DTC B1422 is not
retrieved, system is normal at this time.
DTC B1423: SIDE IMPACT AIR BAG MODULE (RH) SHORT TO GROUND 1. Connect scan tool to Data Link Connector (DLC). See INITIAL SRS
DIAGNOSTIC PROCEDURE
under DIAGNOSTICS. If scan tool is able to
diagnose CAN bus lines and CAN bus lines are satisfactory, go to next step. If
scan tool cannot diagnose CAN bus lines, repair CAN bus lines. Go to next
step.
2. Erase, then retrieve DTCs. Turn ignition off. If DTC B1423 is retrieved, go to
next step. If DTC B1423 is not retrieved, an intermittent condition may exist.
3. Disconnect negative battery cable. Disconnect passenger side impact air bag
module connector D-31. See SIDE IMPACT AIR BAG MODULE
under
REMOVAL & INSTALLATION. See Fig. 30
. Connect Load Resistor
(MB991865) to Load Resistor Adapter (MB991866). Insert load resistor
adapter leads into harness-side terminals No. 1 (Yellow wire) and No. 2
(Yellow/Black wire) of connector D-31. See Fig. 36
. Connect negative battery
cable. Erase, then retrieve DTCs. If DTC B1423 is retrieved, go to next step. If
DTC B1423 is not retrieved, replace passenger side impact air bag module.
4. Disconnect negative battery cable. Remove load resistor and load resistor
adapter from passenger side impact air bag module connector D-31.
Disconnect SRS ECU connector C-25. See SRS ELECTRONIC CONTROL
UNIT (SRS ECU)
under REMOVAL & INSTALLATION. Release SRS ECU

2004 Mitsubishi Endeavor Limited
2004 ACCESSORIES/SAFETY EQUIPMENT Mitsubishi - Air Bag Restraint Systems

connector shorting bar using a cable tie. Measure resistance between ground
and SRS ECU connector C-25, terminal No. 58 (Yellow wire). See Fig. 33
.
Measure resistance between ground and terminal No. 57 (Yellow/Black wire).
If resistance is not infinite at both terminals, go to next step. If resistance is
infinite at both terminals, reconnect SRS components. Erase, then retrieve
DTCs. If DTC B1423 is retrieved, replace SRS ECU. Go to step 6 .
5. Replace wire harness between SRS ECU and passenger side impact air bag
module. Go to next step.
6. Reconnect all SRS components. Activate air bag system. Using scan tool,
retrieve DTCs. If DTC B1423 is retrieved, go to step 1 . If DTC B1423 is not
retrieved, system is normal at this time.
DTC B1424: SIDE IMPACT AIR BAG MODULE (RH) DRIVE CIRCUIT SHORTED 1. Connect scan tool to Data Link Connector (DLC). See INITIAL SRS
DIAGNOSTIC PROCEDURE
under DIAGNOSTICS. If scan tool is able to
diagnose CAN bus lines and CAN bus lines are satisfactory, go to next step. If
scan tool cannot diagnose CAN bus lines, repair CAN bus lines. Go to next
step.
2. Erase, then retrieve DTCs. If DTC B1424 is retrieved, replace SRS ECU. See
SRS ELECTRONIC CONTROL UNIT (SRS ECU)
under REMOVAL &
INSTALLATION. If DTC B1424 is not retrieved, an intermittent condition
may exist.
DTC B1425: SIDE IMPACT AIR BAG MODULE (RH) DRIVE CIRCUIT OPEN 1. Connect scan tool to Data Link Connector (DLC). See INITIAL SRS
DIAGNOSTIC PROCEDURE
under DIAGNOSTICS. If scan tool is able to
diagnose CAN bus lines and CAN bus lines are satisfactory, go to next step. If
scan tool cannot diagnose CAN bus lines, repair CAN bus lines. Go to next
step.
2. Erase, then retrieve DTCs. If DTC B1425 is retrieved, replace SRS ECU. See
SRS ELECTRONIC CONTROL UNIT (SRS ECU)
under REMOVAL &
INSTALLATION. If DTC B1425 is not retrieved, an intermittent condition
may exist.
DTC B1426: SIDE IMPACT SENSOR (RH) FAILURE
2004 Mitsubishi Endeavor Limited
2004 ACCESSORIES/SAFETY EQUIPMENT Mitsubishi - Air Bag Restraint Systems

1. Connect scan tool to Data Link Connector (DLC). See INITIAL SRS
DIAGNOSTIC PROCEDURE
under DIAGNOSTICS. If scan tool is able to
diagnose CAN bus lines and CAN bus lines are satisfactory, go to next step. If
scan tool cannot diagnose CAN bus lines, repair CAN bus lines.
2. Erase, then retrieve DTCs. If DTC B1426 is retrieved, go to next step. If DTC
B1426 is not retrieved, an intermittent condition may exist.
3. Replace passenger-side impact sensor. See FRONT IMPACT SENSOR

under REMOVAL & INSTALLATION. Reconnect SRS components. Erase,
then retrieve DTCs. If DTC B1426 is retrieved, replace SRS ECU. See SRS
ELECTRONIC CONTROL UNIT (SRS ECU)
under REMOVAL &
INSTALLATION. If DTC B1426 is not retrieved, system is normal at this
time.
DTC B1427: SIDE IMPACT SENSOR (RH) VOLTAGE ERROR 1. Connect scan tool to Data Link Connector (DLC). See INITIAL SRS
DIAGNOSTIC PROCEDURE
under DIAGNOSTICS. If scan tool is able to
diagnose CAN bus lines and CAN bus lines are satisfactory, go to next step. If
scan tool cannot diagnose CAN bus lines, repair CAN bus lines. Go to next
step.
2. Erase, then retrieve DTCs. Turn ignition off. If DTC B1427 is retrieved, go to
next step. If DTC B1427 is not retrieved, an intermittent condition may exist.
3. Disconnect negative battery cable. Disconnect passenger side impact sensor
connector D-33. See SEAT SLIDE SENSOR
under REMOVAL &
INSTALLATION. See Fig. 30
. Connect negative battery cable. Turn ignition
on. Measure voltage between ground and side impact sensor connector D-33,
terminal No. 2 (Black/Red wire). See Fig. 37
. If voltage is 9 volts or more,
replace side impact sensor. Go to step 6 . If voltage is less than 9 volts, go to
next step.
4. Disconnect negative battery cable. Disconnect SRS ECU connector C-25. See
SRS ELECTRONIC CONTROL UNIT (SRS ECU)
under REMOVAL &
INSTALLATION. Release SRS ECU connector shorting bar using a cable tie.
Measure resistance of Black/Red wire between SRS ECU connector C-25,
terminal No. 63 and side impact sensor connector D-33, terminal No. 2.
Measure resistance of White/Red wire between SRS ECU connector
C-25,

2004 Mitsubishi Endeavor Limited
2004 ACCESSORIES/SAFETY EQUIPMENT Mitsubishi - Air Bag Restraint Systems

terminal No. 64 and side impact sensor connector D-33, terminal No. 1. If
resistance is not zero ohms, go to next step. If resistance is zero ohms in both
wires, reconnect SRS components. Erase, then retrieve DTCs. If DTC 1427 is
retrieved, replace SRS ECU. Go to step 6 .
5. Replace wire harness between SRS ECU and passenger side impact sensor. Go
to next step.
6. Reconnect all SRS components. Activate air bag system. Using scan tool,
retrieve DTCs. If DTC B1427 is retrieved, go to step 1 . If DTC B1427 is not
retrieved, system is normal at this time.
Fig. 37: Identifying Connector D
-23 & D
-33 Terminals

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
DTC B1428: SIDE IMPACT SENSOR (RH) POWER SUPPLY CIRCUIT 1. Connect scan tool to Data Link Connector (DLC). See INITIAL SRS
DIAGNOSTIC PROCEDURE
under DIAGNOSTICS. If scan tool is able to
diagnose CAN bus lines and CAN bus lines are satisfactory, go to next step. If
scan tool cannot diagnose CAN bus lines, repair CAN bus lines. Go to next
step.
2. Erase, then retrieve DTCs. If DTC B1428 is retrieved, go to next step. If DTC
B1428 is not retrieved, an intermittent condition may exist.
3. Disconnect ne
gative batter
y terminal. Re
place
passen
ger-side im
pact sensor

2004 Mitsubishi Endeavor Limited
2004 ACCESSORIES/SAFETY EQUIPMENT Mitsubishi - Air Bag Restraint Systems

with driver-side impact sensor. See SIDE IMPACT SENSO
R under
REMOVAL & INSTALLATION. Connect negative battery cable. Erase, then
retrieve DTCs. If DTC B1438 or B1439 is retrieved, replace passenger-side
impact sensor. Go to step 5 . If DTC B1438 or B1439 is not retrieved, go to
next step.
4. Disconnect negative battery cable. Disconnect SRS ECU connector C-25. See
SRS ELECTRONIC CONTROL UNIT (SRS ECU)
under REMOVAL &
INSTALLATION. See Fig. 30
. Release SRS ECU connector shorting bar
using a cable tie. Inspect Black/Red wire between SRS ECU connector C-25,
terminal No. 63 and side impact sensor connector D-33, terminal No. 2 for an
open or short circuit. See Fig. 37 . Inspect White/Red wire between SRS ECU
connector C-25, terminal No. 64 and side impact sensor connector D-33,
terminal No. 1 for an open or short circuit. If an open or short circuit is not
found, reconnect SRS components. Erase, then retrieve DTCs. If DTC B1428
is retrieved, replace SRS ECU. Go to next step. If an open or short circuit is
found in either wire, replace wire harness between SRS ECU and side impact
sensor. Go to next step.
5. Reconnect all SRS components. Activate air bag system. Using scan tool,
retrieve DTCs. If DTC B1428 is retrieved, go to step 1 . If DTC B1428 is not
retrieved, system is normal at this time.
DTCB1429: FRONT IMPACT SENSOR (RH) COMMUNICATION IMPOSSIBLE 1. Connect scan tool to Data Link Connector (DLC). See INITIAL SRS
DIAGNOSTIC PROCEDURE
under DIAGNOSTICS. If scan tool is able to
diagnose CAN bus lines and CAN bus lines are satisfactory, go to next step. If
scan tool cannot diagnose CAN bus lines, repair CAN bus lines. Go to next
step.
2. Erase, then retrieve DTCs. If DTC B1428 is retrieved, go to next step. If DTC
B1428 is not retrieved, an intermittent condition may exist.
3. Disconnect negative battery terminal. Replace passenger-side impact sensor
with driver-side impact sensor. See SIDE IMPACT SENSOR
under
REMOVAL & INSTALLATION. Connect negative battery cable. Erase, then
retrieve DTCs. If DTC B1438 or B1439 is retrieved, replace passenger-side
impact sensor. Go to step 5 . If DTC B1438 or B1439 is not retrieved, go to

2004 Mitsubishi Endeavor Limited
2004 ACCESSORIES/SAFETY EQUIPMENT Mitsubishi - Air Bag Restraint Systems