Air Bag Control Module: Testing and Inspection
SRS-ECU INSPECTIONWARNING:
- Never attempt to disassemble or repair the SRS-ECU. If faulty, replace it.
- Do not drop or subject the SRS-ECU to impact or vibration. If denting, cracking, deformation, or rust are discovered in the SRS-ECU, replace it with a new SRS-ECU. Discard the old one.
- After deployment of an air bag, replace the SRS-ECU with a new one.
- Never use an ohmmeter on or near the SRS-ECU, and use only the special test equipment described.
INSPECTION
WARNING: If a dent, crack, deformation or rust is discovered, replace the SRS-ECU with a new one.
- Check the SRS-ECU and brackets for dents, cracks or deformation.
- Check the SRS-ECU connector for damage, and the terminals for deformation.
NOTE: Refer to inspection of SRS-ECU for other than physical damage.
SRS-ECU MEMORY CHECK
Required Special Tool:
- MB991502: Scan tool (MUT-II)
CAUTION: To prevent damage to scan tool MB991502, always turn the ignition switch to "LOCK" (OFF) position before connecting or disconnecting scan tool MB991502.
1. Connect scan tool MB991502 to the data link connector (16-pin).
NOTE: If the battery power supply has been disconnected or disrupted by the collision, scan tool MB991502 cannot communicate with the SRS-ECU. Check the battery then check and, if necessary, repair the front wiring harness and the body wiring harness before proceeding.
2. Read (and write down) all displayed diagnostic trouble codes.
Data List:
3. Read the data list (fault duration and how many times memories are erased) using scan tool MB991502.
4. Erase the diagnostic trouble codes and, after waiting five seconds or more, read (and write down) all displayed diagnostic trouble codes.