B1506

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



DTC B1506: Seat Slide Sensor System Fault 1 (Open in the Seat Slide Sensor Circuit)

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. The most likely causes for this code to be set are the followings:
- Open circuit in the seat slide sensor or harness
- Malfunction of connector contact

TROUBLESHOOTING HINTS
- Open circuit in the seat slide sensor circuit
- Disengaged seat slide sensor connector
- Improper connector contact
- 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

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







1. Disconnect SRS-ECU connector C-29 and 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.




2. Check for continuity between the following terminals. It should be less than 2 ohms.
- SRS-ECU connector C-29 (terminal No.1) and the seat slide sensor connector D-37 (terminal No.1)
- SRS-ECU connector C-29 (terminal No.2) and the seat slide sensor connector D-37 (terminal No.2)

Q: Does continuity exist?

YES: Erase the diagnostic trouble code memory, and check the diagnostic trouble code. If DTC B1506 sets, replace the SRS-ECU. Then go to Step 2.

NO: Replace the harness wires between SRS-ECU connector C-29 and seat slide sensor connector D-37. 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 the "ON" position.
3. Check if the DTC is set.
4. Turn the ignition switch to the "LOCK" (OFF) position.

Q: Is DTC B1506 set?

YES: Return to Step 1.

NO: The procedure is complete.