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Home >> Mitsubishi >> 2012 >> Eclipse L4-2.4L (4G69) >> Repair and Diagnosis >> A L L Diagnostic Trouble Codes ( DTC ) >> Testing and Inspection >> B Code Charts >> B1522

B1522




DTC B1520: Seat belt switch (LH) malfunction
DTC B1521: Seat belt switch (LH) circuit open (for Normal/Close terminal)
DTC B1522: Seat belt switch (LH) circuit (ground side) shorted (for Normal/Close terminal)
DTC B1523: Seat belt switch (LH) circuit (power supply side) shorted (for Normal/Close terminal)
DTC B1524: Seat belt switch (LH) circuit open (for Normal/Open terminal)
DTC B1525: Seat belt switch (LH) circuit (ground side) shorted (for Normal/Open terminal)
DTC B1526: Seat belt switch (LH) circuit (power supply side) shorted (for Normal/Open terminal)
DTC B1527: Seat belt switch (LH) circuit open (for common terminal)
DTC B1528: Seat belt switch (LH) circuit (ground side) shorted (for common terminal)
DTC B1529: Seat belt switch (LH) circuit (power supply side) shorted (for common terminal)













CAUTION:
If DTC B1520, B1521, B1522, B1523, B1524, B1525, B1526, B1527, B1528 or B1529 are set in the combination meter, always diagnose the CAN bus lines.

CIRCUIT OPERATION

The SRS-ECU determines whether the seat belt is fastened or not according to the connection location of the seat belt switch in the seat buckle.

DTC SET CONDITIONS

DTC is set when the resistance between input terminals of the seat belt switch in the SRS-ECU is without the standard value.
Cause of trouble in each DTC is as follows.






TROUBLESHOOTING HINTS

- Malfunction of the seat belt switch

- Damaged wiring harnesses or connectors

- Malfunction of the SRS-ECU


DIAGNOSIS

Required Special Tools:

- MB991222: Probe
- MB991958: Scan Tool (M.U.T.-III Sub Assembly)
- MB991824: V.C.I.
- MB991827: M.U.T.-III USB Cable
- MB991910: M.U.T.-III Main Harness A

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





(1)
CAUTION:
To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.

Connect scan tool MB991958. Refer to "How to connect the scan tool Reading and Clearing Diagnostic Trouble Codes."
(2)Connect scan tool MB991958 to the data link connector.
(3)Turn the ignition switch to the "ON" position.
(4)Diagnose the CAN bus line.
(5)Turn the ignition switch to the "LOCK" (OFF) position.

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

YES Go to Step 3.

NO Repair the CAN bus line CAN Bus Diagnostics Chart). Then go to Step 2.

STEP 2. Recheck for diagnostic trouble code.





Check again if the DTC is set.
(1)Erase the DTC.
(2)Turn the ignition switch to "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 How to Cope With Intermittent Malfunctions).

STEP 3. Check the driver's seat belt switch.

























- Disconnect driver's seat belt switch connector D-22.
- Check continuity between the driver's seat belt switch connector D-22 terminals.





Q. Is driver's seat belt switch in good condition?

YES Go to Step 4.

NO Replace inner seat belt. Front Seat Belt Removal and Installation.)

STEP 4. Check the driver's seat belt switch circuit D-22. Measure the resistance at SRS-ECU connector C-122.









(1)Install the driver's seat belt to the driver's seat belt switch.





(2)Disconnect SRS-ECU connector C-122 and measure at the harness side (rear side).





(3)Measure the resistance between terminal 3 and terminal 4.
Resistance should be 820 ± 20 ohms





(4)Measure the resistance between terminal 3, 4 and body ground.
It should be open circuit.





(5)Measure the resistance between terminal 18 and terminal 4.
Resistance should be less than 2 ohms.





(6)Remove the driver's seat belt from the driver's seat belt switch.





(7)Disconnect SRS-ECU connector C-122 and measure at the harness side (rear side).





(8)Measure the resistance between terminal 18 and 4.
Resistance should be 820 ± 20 ohms





(9)Measure the resistance between terminal 18, 4 and body ground.
It should be open circuit.





(10)Measure the resistance between terminal 3 and terminal 4.
Resistance should be less than 2 ohms.

Q. Does the resistance meet the value above?

YES Erase the diagnostic trouble code memory, and check the diagnostic trouble code. If DTC B1520, B1521, B1522, B1523, B1524, B1525, B1526, B1527, B1528 or B1529 are set, replace the SRS-ECU. (Refer to Service and Repair.) Then go to Step 6.

NO Go to Step 5.

STEP 5. Check the harness wires between SRS-ECU connector C-122 (terminal No.3, 18 and 4) and driver's seat belt switch connector D-22 (terminal No.3, 4 and 5).









Q. Are harness wires between SRS-ECU connector C-122 (terminal No.3, 18 and 4) and driver's seat belt switch connector D-22 (terminal No.3, 4 and 5) in good condition?

YES Go to Step 6.

NO Repair the harness wires between SRS-ECU connector C-122 and driver's seat belt switch connector D-22. Then go to Step 6.

STEP 6. Recheck for diagnostic trouble code.





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 B1520, B1521, B1522, B1523, B1524, B1525, B1526, B1527, B1528 or B1529 set?

YES Return to Step 1.

NO The procedure is complete.

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