Mitsubishi Galant 9G. Manual — part 1423
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-102
STEP 4. Check the passenger’s air bag module circuit.
Measure the voltage at the SRS-ECU connector C-121.
(1) Disconnect SRS-ECU connector C-121.
DANGER
To prevent the air bag from deploying unintentionally,
disconnect the passenger’s air bag module connec-
tor C-110 to short the squib circuit.
(2) Disconnect the passenger's air bag module connector
C-110.
(3) Slide the outer housing of the clock spring side of
passenger’s air bag module connector C-110 in the arrow
direction shown, and disconnect the connector.
(4) Turn the ignition switch to the "ON" position.
AC305362
CONNECTOR: C-121
C-121 (Y)
AH
SRS-ECU
C-121
HARNESS SIDE
CONNECTOR
(REAR VIEW)
42
31
38
27
21
41
28
39
22
30
25
47
36
33
44
34
45
37
48
26
29
23
40
32
43
35
46
24
B
A
AC307137AC
C-110 (Y)
FRONT DECK
CROSSMEMBER
CONNECTOR: C-110
HARNESS SIDE
CONNECTOR
(REAR VIEW)
AC306561AD
OUTER HOUSING OF THE PASSENGER'S
AIR BAG MODULE CONNECTOR C-110
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-103
CAUTION
Do not insert a test probe into the terminal from its front
side directly, as the connector contact pressure may be
weakened.
(5) Measure the voltage between C-121 harness side
connector terminals 27 and 28 <1st squib> or 30 and 31
<2nd squib> and body ground.
Voltage should measure 0 volt.
Q: Is the measured voltage within the specified range?
YES : Erase the diagnostic trouble code memory, and check
the diagnostic trouble code. If DTC B1412 <1st
squib> B1492 <2nd squib> sets, replace the
SRS-ECU (Refer to
NO : Go to Step 5.
STEP 5. Check the harness wires for short circuit to power
supply between SRS-ECU connector C-121 (terminal No.27
and 28 <1st squib> or terminal No.30 and 31 <2nd squib>)
and passenger's air bag module connector C-110 (terminal
No.1 and 2 <1st squib> terminal No.4 and 3 <2nd squib>).
AC301588
42
31
38
27
21
41
28
39
22
30
25
47
36
33
44
34
45
37
48
26
29
23
40
32
43
35
46
24
B
A
C-121 HARNESS SIDE
CONNECTOR (REAR VIEW)
<1ST SQUIB>
AC
AC308153
42
31
38
27
21
41
28
39
22
30
25
47
36
33
44
34
45
37
48
26
29
23
40
32
43
35
46
24
B
A
C-121 HARNESS SIDE
CONNECTOR (REAR VIEW)
<2ND SQUIB>
AB
AC307137AC
C-110 (Y)
FRONT DECK
CROSSMEMBER
CONNECTOR: C-110
HARNESS SIDE
CONNECTOR
(REAR VIEW)
AC305362
CONNECTOR: C-121
C-121 (Y)
AH
SRS-ECU
C-121
HARNESS SIDE
CONNECTOR
(REAR VIEW)
42
31
38
27
21
41
28
39
22
30
25
47
36
33
44
34
45
37
48
26
29
23
40
32
43
35
46
24
B
A
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-104
NOTE: After inspecting intermediate connector C-22 inspect
the wiring harness. If the intermediate connector C-22 is dam-
aged, repair or replace it.
Q: Are the harness wires between SRS-ECU connector
C-121 (terminal No.27 and 28 <1st squib> or terminal
No.30 and 31 <2nd squib>) and passenger's air bag
module connector C-110 (terminal No.1 and 2 <1st
squib> terminal No.4 and 3 <2nd squib>) in good
condition?
YES : Go to Step 6.
NO : Replace the harness wires between SRS-ECU
connector C-121 and passenger's air bag module
connector C-110. Then go to Step 6.
STEP 6. Recheck for diagnostic trouble code.
Check again if the DTC is set.
(1) Erase the DTC.
(2) Turn the ignition switch to the "ON" position.
(3) Check if the DTC is set.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is DTC B1412 <1st squib> B1492 <2nd squib> set?
YES : Return to Step 1.
NO : The procedure is complete.
AC305233
C-22 (Y)
CO
CONNECTOR: C-22
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-105
DTC B1413: Passenger’s (Front) Air Bag Module (1st Squib) System Fault for Ground Circuit
(Short-Circuited to Ground)
DTC B1493: Passenger’s (Front) Air Bag Module (2nd Squib) System Fault for Ground Circuit
(Short-Circuited to Ground)
Passenger's (Front) Air Bag Module (1st Squid and 2nd Squib) Circuit
AIR BAG MODULE
(SQUIB) (PASSENGER'S SIDE)
AIR BAG DRIVE CIRCUIT
: CONNECTOR CONNECTED
: ON
CONNECTOR DICONNECTED
: OFF
SRS-ECU
CONNECTOR
LOCK SWITCH
NOTE
AC305233 AO
CONNECTOR: C-22
C-22 (Y)
AC307137AD
C-110 (Y)
FRONT DECK
CROSSMEMBER
CONNECTOR: C-110
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