Mitsubishi Outlander XL. Manual — part 939

If DTC U0173 is set in the SRS-ECU, always
diagnose the CAN main bus line.

CIRCUIT OPERATION
If an impact of set value or more is detected, the side
impact sensor (rear) sends the coded acceleration
data to SRS-ECU via side impact sensor (front).
Based on the acceleration data, SRS-ECU
determines the necessity of curtain air bag
deployment, and then turns ON the power supply
circuit to the inflator.

DTC SET CONDITIONS
These DTCs are set if communication between the
side impact sensor (rear) (LH) and the SRS-ECU is
not possible or faulty.

TROUBLESHOOTING HINTS

｠

Damaged wiring harnesses or connectors

｠

Malfunction of the side impact sensor (rear) (LH)

｠

Malfunction of the SRS-ECU

DIAGNOSIS

Required Special Tools:

｠

MB991958: Scan Tool (M.U.T.-III Sub Assembly)

｠

MB991824: Vehicle Communication Interface (V.C.I.)

｠

MB991827: M.U.T.-III USB Cable

｠

MB991910: M.U.T.-III Main Harness A (Vehicles with
CAN communication system)

STEP 1. Using scan tool MB991958, diagnose the CAN bus
line.

ZC501967

AC404789

ZC5019680000

MB991824

MB991827

MB991910

Data link

connector

To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before
connecting or disconnecting scan tool MB991958.

(1)

Connect scan tool MB991958. Refer to "How to connect the
scan tool P.52B-31."

(2)

Turn the ignition switch to the "ON" position.

(3)

Diagnose the CAN bus line.

(4)

Turn the ignition switch to the "LOCK" (OFF) position.

Q:Is the CAN bus line found to be normal?

YES:

Go to Step 2.

NO:

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

Diagnosis P.54D-17).

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-287

SRS AIR BAG DIAGNOSIS

STEP 2. Recheck for diagnostic trouble code.

ZC501967

AC404789

ZC5019680000

MB991824

MB991827

MB991910

Data link

connector

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 the DTC 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.00-15).

STEP 3. Check for any diagnostic trouble code. (Using scan
tool MB991958, read the diagnostic trouble code.)
Check the side impact sensor (rear) (LH).

(1)

Disconnect the negative battery terminal.

(2)

Replace the side impact sensor (rear) (LH) with the side
impact sensor (rear) (RH).

(3)

Connect the negative battery terminal.

ZC501967

AC404789

ZC5019680000

MB991824

MB991827

MB991910

Data link

connector

(4)

Erase diagnostic trouble code from memory, and check the
diagnostic trouble code.

Q:Is DTC U0173 set?

YES:

Replace the side impact sensor (rear) (LH) with a

new one. (Refer to P.52B-338). Go to Step 5.

NO:

Go to Step 4.

STEP 4. Check the harness wires for open circuit or short
circuit between side impact sensor (rear) (LH) connector

52B-288

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

SRS AIR BAG DIAGNOSIS

D-115 (terminal No.1 and 2) and side impact sensor (front)
(LH) connector D-122 (terminal No.4 and 3).

Q:Are the harness wires between side impact sensor (rear)

(LH) connector D-115 (terminal No.1 and 2) and side

impact sensor (front) (LH) connector D-122 (terminal No.

4 and 3) in good condition?

YES:

Erase the diagnostic trouble code memory, and check

the diagnostic trouble code. If DTC U0173 sets, replace
the SRS-ECU (Refer to P.52B-326). Then go to Step 5.

NO:

Replace the harness wires between side impact sensor

(rear) (LH) connector D-115 and side impact sensor
(front) (LH) connector D-122. Then go to Step 5.

STEP 5. Recheck for diagnostic trouble code.

ZC501967

AC404789

ZC5019680000

MB991824

MB991827

MB991910

Data link

connector

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 U0173 set?

YES:

Return to Step 1.

NO:

The procedure is complete.

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-289

SRS AIR BAG DIAGNOSIS

DTC U0175: Side Impact Sensor (Front) (RH) Communication Error

M15204000975USA0000010000

CPU

CPU

SIDE IMPACT
SENSOR
(FRONT: RH)

SIDE IMPACT
SENSOR
(REAR: RH)

SRS-ECU

Side Impact Sensor (Front, Rear) (RH) Circuit

ACCELERO
METER

ACCELERO
METER

ZC600876

Connector: C-27

C-27 (Y)

0025

ZC6008800017

Connector: D-132

D-132 (Y)

ZC6008790020

Connector: D-129

D-129 (Y)

52B-290

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

SRS AIR BAG DIAGNOSIS