Mitsubishi Eclipse / Eclipse Spyder (2000-2002). Service and repair manual — part 677
SRS AIR BAG DIAGNOSIS
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SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-35
STEP 2. Check the SRS warning light bulb.
Q: Has the SRS warning light bulb blown?
YES : Replace the SRS warning light bulb. Then go to Step
NO : Go to Step 3.
STEP 3. Check the harness wires between the ignition
switch (IG1) and SRS-ECU connector C-72.
NOTE: After inspecting intermediate connectors C-41, C-42, C-
101, C-104 inspect the wiring harness. If intermediate
connectors C-41, C-42, C-101, C-104 are damaged, repair or
replace them. Refer to GROUP 00E, Harness Connector
Inspection
. Then go to Step 6.
Q: Are the harness wires between the ignition switch (IG1)
and SRS-ECU connector C-72 in good condition?
YES : Go to Step 4.
NO : Repair them. Then go to Step 6.
AC000346AB
SRS WARNING LIGHT
AC000358AD
SRS-ECU
ACCELERATOR PEDAL
CENTER REINFORCEMENT(LH)
CONNECTOR: C-72
AC000370AC
CONNECTOR: C-41, C-42
C-42
C-41
COMBINATION METER
AC000371AC
CONNECTORS: C-101, C-104
C-301
C-308
JUNCTION
BLOCK
(FRONT VIEW)
SRS AIR BAG DIAGNOSIS
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SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-36
STEP 4. Check the ground line at the SRS-ECU connector
C-72 by backprobing.
(1) Do disconnect the connector C-72.
(2) Measure the resistance between terminal 3 and ground by
backprobing.
•
Should be less than 2 ohm.
Q: Is the resistance between terminal 3 and ground less
than 2 ohm?
YES : Go to Step 6.
NO : Go to Step 5.
STEP 5. Check the harness wires between SRS-ECU
connector C-72 and ground.
Q: Are the harness wires between SRS-ECU connector C-
72 and ground in good condition?
YES : Go to Step 6.
NO : Repair them. Then go to Step 6.
STEP 6. Check for DTC.
Q: Is any of DTC 43 or 44 output?
YES : There is no action to be taken.
NO : This diagnosis is compleate.(If no malfunctions are
not found in all steps, an intermittent malfunction is
suspected. Refer to GROUP 00, How to Use
Troubleshooting/Inspection Service Points
−
How to
Cope with Intermittent Malfunction
.)
AC000368AC
C-72 CONNECTOR HARNESS SIDE VIEW
AC000358AD
SRS-ECU
ACCELERATOR PEDAL
CENTER REINFORCEMENT(LH)
CONNECTOR: C-72
SRS AIR BAG DIAGNOSIS
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SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-37
DTC 71: Right side-air bag module (squib) system fault 1
DTC 72: Right side-air bag module (squib) system fault 2
DTC 75: Right side-air bag module (squib) system fault power supply circuit
DTC 76: Right side-air bag module (squib) system fault ground circuit
CIRCUIT OPERATION
•
The SRS-ECU judges how severe a collision is
by detecting signals from the left and right side
impact sensors and the analog G-sensor. If the
impact is over a predetermined level, the SRS-
ECU outputs an ignition signal. At this time, if the
safing G-sensor is on, the SRS air bag will inflate.
•
The ignition signal is input to the air bag module
to inflate the air bag.
DTC SET CONDITIONS
•
These DTC are output if there is abnormal
resistance between the input terminals of the side
air bag module (RH) (squib). The most likely
causes for this code to be set are shown in the
table below:
TROUBLESHOOTING HINTS
•
Damaged wiring harnesses or connectors
•
Malfunction of the side air bag module (RH)
(squib)
•
Malfunction of the SRS-ECU
AC003885AB
Side Air Bag Module (RH) (Squib) Circuit
AC000358AF
CONNECTOR: C-74
SRS-ECU
ACCELERATOR PEDAL
CENTER REINFORCEMENT (LH)
AC002976AB
CONNECTOR: D-19
SRS AIR BAG DIAGNOSIS
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SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-38
DIAGNOSIS
Required Special Tools:
•
MB991502: Scan Tool (MUT-II)
•
MB991613: SRS Check Harness
STEP 1. Check the side air bag module line using the scan
tool and MB991613 SRS Check harness.
(1) Disconnect side air bag module (RH) connector D-19.
(2) Connect special tool MB991613 connector (1).
(3) Connect the negative battery terminal.
(4) Erase the DTC memory.
Q: Is DTC 71, 72, 75 or 76 output?
YES : Go to Step 2.
NO : Replace the seat back assembly of the front seat
(RH). Refer to GROUP 52A, Front Seat
.
Then go to Step 3.
STEP 2. Check the harness wires between SRS-ECU
connector C-74 and side air bag module (RH) connector D-
19
Q: Are the harness wires between SRS-ECU connector C-
74 and side air bag module (RH) connector D-19 in good
condition?
YES : Go to Step 3.
NO : Repair them. Then go to Step 3.
DTC
SYMPTOMS
71
•
Short circuit in side air bag module (RH) (squib) or harness
72
•
Open circuit in side air bag module (RH) (squib) or harness
•
Malfunction of connector contact
75
•
Short circuit in side air bag module (RH) (squib) harness leading to the power supply
76
•
Short circuit in side air bag module (RH) (squib) harness leading to the ground
AC002977AB
MB991613
1
D-19
AC000358AF
CONNECTOR: C-74
SRS-ECU
ACCELERATOR PEDAL
CENTER REINFORCEMENT (LH)
AC002976AB
CONNECTOR: D-19
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