VSA DTC Troubleshooting: 158-1
DTC 158-1: ECU Software Update Failure
NOTE:
Do not turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode while updating the VSA modulator-control unit. If you turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode before completion, the VSA modulator-control unit will be damaged.
Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information.

DTC Description
DTC
Freeze Frame
158-1 ECU Software Update Failure
    

1.
VSA modulator-control unit check (update):

VSA modulator-control unit check (update)
?1.
Update the VSA modulator-control unit if it does not have the latest software.

?2.
Turn the ignition switch to LOCK (0), then turn it to ON (II) again, or select the OFF mode, then the ON mode.

?3.
Check for DTCs with the HDS.
DTC Description
DTC
Freeze Frame
     

Is DTC 158-1 indicated?

     
YES
     
     
     
     
NO
     
     
     
Troubleshooting is complete. If any other DTCs are indicated, go to the indicated DTCs troubleshooting.?