Post-Collision Diagnosis & Repair

POST-COLLISION DIAGNOSIS

To inspect and service the SRS after a collision (whether or not the air bags have deployed), perform the following steps.

SRS-ECU MEMORY CHECK

Required Special Tool:
- 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)







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.

1. Connect scan tool MB991958 to the data link connector(16-pin).
2. Read (and write down) all displayed diagnostic trouble codes (Refer to SRS-ECU, Diagnostic Trouble Code Descriptions Occupant classification-ECU). Diagnostic Trouble Code Descriptions

NOTE: If the battery power supply has been disconnected or disrupted by the collision, scan tool MB991958 cannot communicate with the SRS-ECU. Check the battery, then check and, if necessary, repair the front wiring harness and the instrument panel wiring harness before proceeding.

3. Read the data list (fault duration and how many times memories are erased), using scan tool MB991958. Data List Reference Table
4. Erase the diagnostic trouble codes, and then turn the ignition switch to the LOCK (OFF) position.
5. Wait for at least one second, and then turn the ignition switch to the ON position again.
6. After waiting 15 seconds or more, note all displayed diagnostic trouble codes (Refer to SRS-ECU, Diagnostic Trouble Code Descriptions Occupant classification-ECU). Diagnostic Trouble Code Descriptions