91-1

DTC 91-1: SH-AWD Control Unit Programming error

NOTE:
^ Before you troubleshoot, review the general troubleshooting information.
^ DTC 91-1 is stored when the SH-AWD system update is not completed.
^ Do not turn the ignition switch OFF while updating the SH-AWD system. If you turn the ignition switch OFF before completion, the SH-AWD system can be damaged.

1. Do the SH-AWD system update procedure.
2. Check for DTCs with the HDS.

Is DTC 91-1 indicated?

YES - Update the SH-AWD control unit if it does not have the latest software, or substitute a known-good SH-AWD control unit and recheck. If the symptom/indication goes away with the updated SH-AWD control unit, troubleshooting is complete. If the symptom/indication goes away with a known-good SH-AWD control unit, replace the original SH-AWD control unit.

NO - Update is complete.