When replacing the SRS control unit, make sure to write vehicle information into the new SRS control unit.
The scan tool used for the replacement procedure must be the same from start to finish. If the scan tool is changed midway, information cannot be written correctly.
Perform the SRS control unit replacement and programming according to the following procedure.
| SRS control unit replacement procedure |
|
| 1 |
SRS control unit replacement |
| 2 |
Vehicle identification number (VIN) programming |
| 3 |
ECU Lock |
| 4 |
DTC verification/clearing |
1) Program VIN (Vehicle Identification Number)
The purpose of this function is to write the Vehicle Identification Number (VIN) when the SRS control unit is replaced.
2) ECU Lock
The purpose of this function is to provide a security lock if the SRS control unit is replaced. When the SRS control unit is replaced with a new one, a DTC will be set if ECU Lock is not performed.
3) DTC verification/clearing
The purpose of this function is to check if any DTCs are set. If a DTC is set, clear the DTC, and then check again to make sure that no DTC is set.
1) Replace the SRS control unit.
1) Select "Programming" on the scan tool.
2) Select Program VIN (Vehicle Identification Number), and enter the vehicle identification number (VIN) indicated on the ID plate.
Note
1) Select "Programming" on the scan tool.
2) Select ECU Lock, and follow the on-screen instructions to perform the ECU Lock.
3) After completing the ECU Lock, turn the ignition switch OFF for 30 seconds.
1) Observe the DTC information with a scan tool.
2) If a DTC is set, clear the DTC.
3) Turn OFF the ignition switch.
4) Turn ON the ignition switch.
5) Observe the DTC information with a scan tool.
6) If a DTC is set, go to the applicable diagnosis.