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Home >> Jeep >> 2021 >> Grand Cherokee L Altitude, AWD >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> (Instrument Cluster - Electrical Diagnostics) >> DTC Troubleshooting >> B12B5-49-Head Up Display Module - Internal Electronic Failure >> Diagnostic Test

Diagnostic Test

  1. READ AND RECORD DTCS AND ENVIRONMENTAL DATA - ERASE DTCS AND CHECK FOR DTC TO RETURN 
    1. With the scan tool, read DTCs in all Electronic Control Units (ECUs) and record on the repair order.
    2. With the scan tool, run a vehicle Scan Report, or record the Environmental Data related to the DTCs.
    3. With the scan tool, erase all DTCs.
    4. Turn the ignition off for a minimum of 10 seconds.
    5. Turn the ignition on.
    6. Using the recorded Environmental Data and the When Monitored Conditions, operate the vehicle in the conditions that set the DTC.
    7. With the scan tool, read DTCs.

    Did the DTC return?

    Yes 

    • Go To  2

    No 

  2. CHECK FOR APPLICABLE SOFTWARE UPDATES AND SERVICE BULLETINS 
    1. With a scan tool, check for software updates that are related to the customer concern.
    2. Check for any service bulletins that could be related to the customer concern.

    Were any software updates or service bulletins applicable to the customer concern?

    Yes 

    • Perform the service procedure as necessary.
    • Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .

    No