Diagnostic Test

Ignition on, engine not running.

With the scan tool, read DTCs in the Antilock Brake Controller.

Are there any DTCs present? 

Yes 

1. Refer to the DIAGNOSTIC CODE INDEX and perform the applicable diagnostic procedure.
2. Perform TRANSFER CASE VERIFICATION TEST .

No 

1. Replace the Final Drive Control Module in accordance with the Service Information.
2. Perform TRANSFER CASE VERIFICATION TEST .