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Mitsubishi Grandis. Manual - part 1035

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-192

STEP 3. Connector check: SRS-ECU connector
C-118, C-119 and C-120.

Q: Are connectors correctly engaged?

YES :

Go to Step 4.

NO :

Engage the connectors correctly. Then go to
Step 5.

STEP 4. Connector check: SRS-ECU connector
C-118, C-119 and C-120.

(1) Disconnect SRS-ECU connectors C-118, C-119

and C-120.

(2) Check the connector lock switch terminal inside

the harness side connector for improper contact
or deformation.

Q: Are the SRS-ECU connector C-118, C-119 and

C-120 in good condition?
YES :

Erase the diagnosis code memory, and

check the diagnosis code. If diagnosis code
B1519 sets, replace the SRS-ECU. (Refer
to

P.52B-223

). Then go to Step 5.

NO :

Replace the SRS-ECU connector C-118,
C-119 and C-120. Then go to Step 5.

STEP 5. Check whether the diagnosis code is
reset.

Q: Is diagnosis code B1519 set?

AC313383

54 53

52 51

62 61

57 56 55

7069 68 6766 65 64 63

2625 24

2322 21

37 36 353433 32 3130 29 2827

48 47 46 45 444342 41 40

AC311438

Connectors: C-118, C-119, C-120

C-118 (Y)
C-119 (Y)
C-120 (Y)

Harness side
(front view)

C-118

C-119

C-120

AC313383

54 53

52 51

62 61

57 56 55

7069 68 6766 65 64 63

2625 24

2322 21

37 36 353433 32 3130 29 2827

48 47 46 45 444342 41 40

AC311438

Connectors: C-118, C-119, C-120

C-118 (Y)
C-119 (Y)
C-120 (Y)

Harness side
(front view)

C-118

C-119

C-120

AC301599 AB

SRS-ECU Harness side connector
(front view)

Connector lock
switch terminal

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-193

YES :

There is no action to be taken.

NO :

The procedure is complete (If no
malfunctions are found in all steps, an
intermittent malfunction is suspected). Refer
to GROUP 00, How to Use
Troubleshooting/Inspection Service Points

P.00-5

Code No.B1547: Cut Off for Passenger’s Air Bag

CAUTION

If diagnosis code B1547 is set in the SRS-ECU,
always diagnose the CAN main bus line.

DIAGNOSIS CODE SET CONDITIONS

When judging a collision, this code is set while the
passenger's air bag is OFF.

DIAGNOSIS PROCEDURE

STEP 1. MUT-III CAN bus diagnostics
Use the MUT-III to diagnose the CAN bus lines.

Q: Is the check result normal?

YES :

Go to Step 2.

NO :

Repair the CAN bus line (Refer to GROUP
54D, Diagnosis

P.54D-16

STEP 2. MUT-III diagnosis code
Check that the diagnosis code except B1547 is set.
(1) Turn the ignition switch to the "ON" position.

(2) Check if the diagnosis code is set.
(3) Turn the ignition switch to the "LOOK (OFF)"

position.

Q: Is the diagnosis code set?

YES :

Carry out the troubleshooting according to a

set diagnosis code. Refer to

P.52B-13

NO :

Go to Step 3 .

STEP 3. Check whether the diagnosis code is
reset.
Check again if the diagnosis code is set.
(1) Erase the diagnosis code.
(2) Ignition: LOCK (OFF) position to ON
(3) On completion, check that the diagnosis code is

not reset.

Q: Is diagnosis code B1547 set?

YES :

Replace the SRS-ECU (Refer to

P.52B-223

NO :

The procedure is complete.

Code No.B1556: Seat Slide Sensor System for Fault 2 (Malfunction of Seat Slide Sensor)

CAUTION

If diagnosis code B1556 is set in the SRS-ECU,
always diagnose the CAN main bus line.

DIAGNOSIS CODE SET CONDITIONS

These diagnosis codes are set if the following
conditions are detected from the seat slide sensor
output:

• Seat slide sensor is not operating.

• Seat slide sensor characteristics are abnormal.

• Seat slide sensor output is abnormal.

PROBABLE CAUSES

Malfunction of seat slide sensor

DIAGNOSIS

STEP 1. MUT-III CAN bus diagnostics
Use the MUT-III to diagnose the CAN bus lines.

Q: Is the check result normal?

YES :

Go to Step 2.

NO :

Repair the CAN bus line (Refer to GROUP
54D, Diagnosis

P.54D-16

STEP 2. Check whether the diagnosis code is
reset.
Check again if the diagnosis code is set.
(1) Erase the diagnosis code.
(2) Ignition: LOCK (OFF) position to ON
(3) On completion, check that the diagnosis code is

not reset.

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-194

Q: Is the diagnosis code set?

YES :

Go to Step 3.

NO :

There is an intermittent malfunction such as
poor engaged connector(s) or open circuit
(Refer to GROUP 00, How to Cope with
Intermittent Malfunction

P.00-5

STEP 3. Check the seat slide sensor. (MUT-III
diagnosis code.)
Replace seat slide sensor (Refer to

P.52B-242

Check the diagnosis code.

Q: Is either diagnosis code B1556 set?

YES :

Replace the SRS-ECU (Refer to

P.52B-223

NO :

The procedure is complete.

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-195

Code No. B1570: Passenger’s air bag cut off switch malfunction
Code No. B1571: Passenger’s air bag cut off switch circuit open (for Normal/Close terminal)
Code No. B1572: Passenger’s air bag cut off switch circuit (earth side) shorted (for Normal/Close
terminal)
Code No. B1573: Passenger’s air bag cut off switch circuit (power supply side) shorted (for
Normal/Close terminal)
Code No. B1574: Passenger’s air bag cut off switch circuit open (for Normal/Open terminal)
Code No. B1575: Passenger’s air bag cut off switch circuit (earth side) shorted (for Normal/Open
terminal)
Code No. B1576: Passenger’s air bag cut off switch circuit (power supply side) shorted (for
Normal/Open terminal)
Code No. B1577: Passenger’s air bag cut off switch circuit open (for COM terminal)
Code No. B1578: Passenger’s air bag cut off switch circuit (earth side) shorted (for COM terminal)
Code No. B1579: Passenger’s air bag cut off switch circuit (power supply side) shorted (for COM
terminal)
Code No. B1581: Improper installation of passenger’s air bag cut off switch

Wire colour code
B : Black LG : Light green G : Green L : Blue W : White Y : Yellow SB : Sky blue
BR : Brown O : Orange GR : Gray R : Red P : Pink V : Violet

SRS-ECU

PASSENGER'S AIR BAG
CUT OFF SWITCH

Passenger's Air Bag Cut Off Switch Circuit

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