B1507

This document has been updated per Mitsubishi TSB# 06-52b-001



DTC B1507: Seat Slide Sensor System Fault Ground Circuit (Short-Circuited to Ground)

Seat Slide Sensor Circuit:

CIRCUIT OPERATION
- The seat slide sensor sets the current value Hi or Low determined by the seat position.
- The SRS-ECU determines the seat position according to the current value from the seat slide sensor.

DTC SET CONDITIONS
This DTC is set if there is abnormal resistance between the input terminals of the seat slide sensor.

TROUBLESHOOTING HINTS
- Damaged wiring harnesses or connectors
- Short to ground in the seat slide sensor harness
- Malfunction of the SRS-ECU

DIAGNOSIS

Required Special Tools:
- MB991958: Scan Tool (MUT-III Sub Assembly)
- MB991824: V.C.I.
- MB991827: MUT-III USB Cable
- MB991910: MUT-III Main Harness A
- MB991865: Dummy resistor
- MB991866: Resister harness

STEP1. Check the seat slide sensor circuit. Measure the resistance at the SRS-ECU connector C-29.




1. Disconnect SRS-ECU connector C-29.




2. Disconnect seat slide sensor connector D-37.

CAUTION: Do not insert a test probe into the terminal from its front side directly, as the connector contact pressure may be weakened.




3. Check for continuity between C-29 harness side connector terminals 1, 2 and body ground.
It should be open circuit.

Q: Does continuity exist?

YES: Erase the diagnostic trouble code memory, and check the diagnostic trouble code. If DTC B1507 sets, replace the SRS-ECU. Then go to Step 3.

NO: Go to Step 2.







STEP 2. Check the harness wires for short circuit to ground between SRS-ECU connector C-29 (terminal No.1 and 2) and seat slide sensor connector D-37 (terminal No.1 and 2).

Q: Are the harness wires between SRS-ECU connector C-29 (terminal No.1 and 2) and seat slide sensor connector D-37 (terminal No.1 and 2) in good condition?

YES: Go to Step 3.

NO: Replace the harness wires between SRS-ECU connector C-29 and seat slide sensor connector D-37. Then go to Step 3.

STEP 3. 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 B1507 set?

YES: Return to Step 1.

NO: The procedure is complete.