Mitsubishi Pajero Pinin. Manual — part 307
SRS –
Special Tools/Test Equipment
52B-7
Tool
Use
Name
Number
MR372530
SRS air bag
adapter harness
Deployment of driver’s side air bag module
inside the vehicle
MB686560
SRS air bag
adapter harness
Deployment of front passenger’s side air bag
module inside or outside the vehicle
MR203491 or
MB628919
SRS air bag
adapter harness
Deployment of driver’s side air bag module
outside the vehicle
TEST EQUIPMENT
Tool
Name
Use
Digital multi-meter
Checking the SRS electrical circuitry
Use a multi-meter for which the maximum
test current is 2 mA or less at the minimum
range of resistance measurement
SRS –
Troubleshooting
52B-8
TROUBLESHOOTING
STANDARD FLOW OF DIAGNOSTIC TROUBLESHOOTING
Refer to GROUP 00 – How to Use Troubleshooting/Inspection Service Points.
DIAGNOSIS FUNCTION
DIAGNOSIS CODES CHECK
Connect the MUT-
II
to the diagnosis connector (16-pin) under the instrument under cover, then check
diagnosis codes.
(Refer to GROUP 00 – How to Use Troubleshooting/Inspection Service Points.)
ERASING DIAGNOSIS CODE
Connect the MUT-
II
to the diagnosis connector and erase the diagnosis code.
Caution
Turn off the ignition switch before connecting or disconnecting the MUT-
II.
SRS WARNING LAMP INSPECTION
1.
Check to be sure that the SRS warning lamp illuminates
when the ignition switch is in the ON position.
2.
Check to be sure that it illuminates for approximately 7
seconds and then switches off.
3.
If the above is not the cause, inspect the diagnosis codes.
INSPECTION CHART FOR DIAGNOSIS CODES
Inspect according to the inspection chart that is appropriate for the malfunction code.
Code No.
Diagnosis item
Reference page
11, 12, 13
Front impact sensor system
52B-10
14
Analog G-sensor system in the SRS-ECU
52B-11
15,16
Front impact safing G-sensor system inside SRS-ECU
52B-11
17
Side impact safing G-sensor system inside SRS-ECU
52B-11
21*
2
, 22*
2
, 61*
2
, 62*
2
Driver’s side air bag module (squib) system
52B-12
24*
2
, 25*
2
, 64*
2
, 65*
2
Front passenger’s side air bag module (squib) system
52B-13
26*
2
, 27*
2
, 66, 67
Driver’s side pre-tensioner (squib) system
52B-14
28*
2
, 29*
2
, 68, 69
Front passenger’s side pre-tensioner (squib) system
52B-15
31, 32
SRS-ECU capacitor system
52B-11
34*
1
Connector lock system
52B-16
35
SRS-ECU (deployed air bag) system
52B-16
SRS warning lamp
SRS –
Troubleshooting
52B-9
Code No.
Reference page
Diagnosis item
41*
1
Power circuit system (fuse No.6 circuit)
52B-16
42*
1
Power circuit system (fuse No.8 circuit)
52B-16
43*
1
SRS warning lamp drive circuit
system
Lamp does not illuminate.
52B-17
system
Lamp does not switch off.
52B-17
44*
1
SRS warning lamp drive circuit system
52B-17
45
Internal circuit system of non-volatile memory (EEPROM) inside
SRS-ECU
52B-11
51, 52
Driver’s side air bag module (squib ignition drive circuit) system
52B-11
54, 55
Front passenger’s side air bag module (squib ignition drive circuit)
system
52B-11
56, 57
Driver’s side pre-tensioner (squib ignition drive circuit) system
52B-11
58, 59
Front passenger’s side pre-tensioner (squib ignition drive circuit) system
52B-11
71*
2
, 72*
2
, 75, 76
Side air bag module (R.H.) (squib) system
52B-18
73, 74
Side air bag module (R.H.) (squib ignition drive circuit) system
52B-11
79, 93
Side impact sensor (L.H.) communication system
52B-19
81*
2
, 82*
2
, 85, 86
Side air bag module (L.H.) (squib) system
52B-19
83, 84
Side air bag module (L.H.) (squib ignition drive circuit) system
52B-11
89, 96
Side impact sensor (R.H.) communication system
52B-20
91*
1
Side impact sensor (L.H.) power supply circuit system
52B-21
92
Side impact sensor (L.H.) system
52B-21
94*
1
Side impact sensor (R.H.) power supply circuit system
52B-21
95
Side impact sensor (R.H.) system
52B-21
NOTE
(1) *
1
: If the vehicle condition returns to normal, the diagnosis code will be automatically erased, and the SRS warning
lamp will return to normal.
(2) *
2
: If the trouble(s) are extinguished, the SRS warning lamp go out with diagnosis code history stored.
(3) If the vehicle has a discharged battery it will store the diagnosis codes 41 or 42. When these diagnosis codes are
displayed, check the battery.
SRS –
Troubleshooting
52B-10
INSPECTION PROCEDURE CLASSIFIED BY DIAGNOSIS CODE
Code No.11, 12 or 13 Front impact sensor system
Probable cause
These diagnostic trouble codes are output if there is abnormal resistance between
the input terminals of the front impact sensors.
The trouble causes for each diagnosis code No. are as follows.
D
Malfunction of front impact sensor
D
Malfunction of wiring harness of connectors
D
Malfunction of SRS-ECU
Code No.
Trouble Symptom
11
D
Short circuit in front impact sensor or harness
D
Short circuit in front impact sensor harness leading to the vehicle body ground
D
Short circuit in front impact sensor harness leading to the power supply
12
D
Open circuit in either left or right front impact sensor or harness
D
Short circuit in front impact sensor harness leading to the power supply
13
D
Open circuit in both left or right front impact sensor or harness
D
Short circuit in front impact sensor harness leading to the power supply
Front impact sensor check. (Refer to P.52B-33)
NG
OK
OK
Measure at SRS-ECU connector C-32.
D
Disconnect the connector and measure at the harness side.
D
Connect negative (–) battery terminal.
D
Ignition switch: ON
D
Resistance between terminal 1 and 2
OK: 820
±
82
Ω
D
Resistance between terminal 3 and 4
OK: 820
±
82
Ω
NG
Replace the SRS-ECU.
Check trouble symptoms.
Repair
Check the harness wire between the SRS-ECU and front impact
sensor
,
and repair if necessary.
NG
Check the following connectors:
A-51, A-49, C-28, C-32
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