Mitsubishi Grandis. Manual - part 1018

 

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Mitsubishi Grandis. Manual - part 1018

 

 

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-124

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.

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 curtain air bag module (RH). 
(MUT-III diagnosis code.) 
(1) Disconnect the negative battery terminal.

(2) Disconnect the intermediate connector G-22 

(connection between rear floor harness and floor 
harness).

(3) Connect special tool dummy resistor (MB991865) 

to special tool resistor harness (MB991866).

CAUTION

Do not insert a test probe into the terminal from 
its front side directly as the connector contact 
pressure may be weakened.
(4) Insert special tool resistor harness probe into 

floor harness side connector G-22 by 
backprobing.

(5) Connect the negative battery terminal.
(6) Erase diagnosis code memory, and check the 

diagnosis code.

Q: Is diagnosis code B1453 set?

YES : 

Go to Step 4.

NO : 

Go to Step 5.

STEP 4. Check the curtain air bag module circuit. 
Voltage measurement at the SRS-ECU connector 
C-120.
(1) Disconnect the negative battery terminal.

(2) Disconnect SRS-ECU connector C-120.
(3) Turn the ignition switch to the "ON" position.

CAUTION

Do not insert a test probe into the terminal from 
its front side directly as the connector contact 
pressure may be weakened.
(4) Voltage measurement between C-120 harness 

side connector terminals 5, 6 and body earth.

OK: 0 V

Q: Is the measured voltage within the specified 

range?

YES : 

Go to Step 6.

NO : 

Repair the harness wire between SRS-ECU 
connector C-120 (terminal No.5 and 6) and 
intermediate connector G-22 (floor harness 
side, terminal No.1 and 2).

AC302576AE

 G-22 (R)

Connector: G-22

Floor harness
side (front view)

Third seat
belt (LH)

Second seat
belt (LH)

2 1

AC006042CA

MB991866
(Resistor harness)

G-22 Floor harness
connector

G-22 Rear floor
harness connector

MB991865
(Dummy resistor : 3

ΩΩ

AC311438 AE

C-120 (Y)

Connector: C-120

Harness side
(front view)

AC301564

A

B

18

10

15

7

13

5

14

6

16

8

17

9

19

11

20

12

1 2

3 4

AC

C-120
Harness side connector 
(rear view)

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-125

STEP 5. Check the curtain air bag module circuit. 
Voltage measurement at the intermediate 
connector G-22.
(1) Disconnect the negative battery terminal.

(2) Disconnect the intermediate connector G-22 

(connection between rear floor harness and floor 
harness).

(3) Turn the ignition switch to the "ON" position.

CAUTION

Do not insert a test probe into the terminal from 
its front side directly as the connector contact 
pressure may be weakened.
(4) Voltage measurement between G-22 harness 

side connector terminals 1, 2 and body earth.

OK: 0 V

Q: Is the measured voltage within the specified 

range?

YES : 

Replace the curtain air bag module (LH) 

(Refer to 

P.52B-231

).

NO : 

Repair the harness wire between 
intermediate connector G-22 (terminal No.1 
and 2) and curtain air bag module (LH) 
connector G-01 (terminal No.1 and 2).

STEP 6. Check whether the diagnosis code is 
reset.

Q: Is diagnosis code B1453 set?

YES : 

Replace the SRS-ECU (Refer to 

P.52B-223

).

NO : 

An intermittent malfunction is suspected 
(Refer to GROUP 00, How to Use 
Troubleshooting/Inspection Service Points 

P.00-5

). 

AC302576AE

 G-22 (R)

Connector: G-22

Floor harness
side (front view)

Third seat
belt (LH)

Second seat
belt (LH)

2 1

AC303709

2

1

G-22 Rear floor harness

connector (rear view)

AC

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-126

Code No.B1457: Side Impact Sensor (Rear) (LH) Power Supply Circuit System

CAUTION

If diagnosis code B1447 is set in the SRS-ECU, 
always diagnose the CAN main bus line.

OPERATION

The side impact sensor (Rear) includes an analogue 
G sensor and CPU, etc. The CPU monitors the 
analogue G sensor output signal. If the CPU judges 
that the curtain air bags should be deployed, it sends 
a fire signal to the SRS-ECU to deploy the curtain air 
bags. In addition, the CPU diagnoses the internal 
components of the side impact sensor (Rear). If a 
malfunction occurs, it requests the SRS-ECU to set a 
diagnosis code.

DIAGNOSIS CODE SET CONDITIONS

This diagnosis code will set when the power supply 
voltage to the side impact sensor (Rear) (RH) 
remains less than a predetermined value for five 
seconds. However, if the system returns to normal 
condition, code number B1457 will be erased 
automatically and the SRS warning lamp will go out.

PROBABLE CAUSES

• Damaged wiring harness or connectors

• Malfunction of the side impact sensor (Rear) (LH)

• Malfunction of the SRS-ECU

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. 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 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

).

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

SIDE IMPACT 
SENSOR (REAR: LH)

SRS-ECU

Side Impact Sensor (Rear) (LH) Circuit

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-127

STEP 3. Check the side impact sensor (Rear) (LH) 
power supply circuit. Voltage measurement at the 
side impact sensor (Rear) (LH) connector D-12.
(1) Disconnect the negative battery terminal.

(2) Disconnect side impact sensor (Rear) (LH) 

connector D-12, and measure at the wiring 
harness side.

(3) Connect the negative battery terminal.
(4) Turn the ignition switch to the "ON" position.

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 D-12 harness side 

connector terminal 1 and body earth.

OK: 9 V or more

Q: Is the check result normal?

YES : 

Replace the side impact sensor (Rear) (LH). 

(Refer to 

P.52B-236

). Then go to Step 5.

NO : 

Go to Step 4.

STEP 4. Check the harness wires for open circuit 
or short circuit between SRS-ECU connector 
C-120 (terminal No.15 and 16) and side impact 
sensor (Rear) (LH) connector D-12 (terminal No.1 
and 2).

Q: Are the harness wires between SRS-ECU 

connector C-120 (terminal No.15 and 16) and side 
impact sensor (Rear) (LH) connector D-12 (terminal 
No.1 and 2) in good condition?

YES : 

Go to Step 5.

NO : 

Replace the harness wires between 
SRS-ECU connector C-120 (terminal No.15 
and 16) and side impact sensor (Rear) (LH) 
connector D-12 (terminal No.1 and 2).

STEP 5. Check whether the diagnosis code is 
reset.

Q: Is diagnosis code B1457 set?

YES : 

Replace the SRS-ECU (Refer to 

P.52B-223

).

NO : 

An intermittent malfunction is suspected 
(Refer to GROUP 00, How to Use 
Troubleshooting/Inspection Service Points 

P.00-5

).

AC311614 AD

D-12 (Y)

Connector: D-12

Harness side
(front view)

AC311097

D-12 Harness side
connector
(rear view)

AJ

AC311438 AE

C-120 (Y)

Connector: C-120

Harness side
(front view)

AC311614 AD

D-12 (Y)

Connector: D-12

Harness side
(front view)

 

 

 

 

 

 

 

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