Service bulletin LI54.30-P-078649

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

NHTSA's summary

Complaint Symptoms with driver display and/or central display Cause Under analysis Remedy NOTE: Please do not replace any parts. If you have symptoms with one or both displays, a TIPS case must be created. The TIPS case will be reviewed by MBUSA and GCSP. NOTE: Please perform the following steps before creating a TIPS case: Step 1: Check software release of the following control units to see if they are up to date; if necessary perform software update. • Instrument cluster (IC177 / IC 177M) • Head unit (HU6 / HU7) • All displays (DISP6 / DISP7S2) Reassess problem. If the problem is still present, continue with step 2. Step 2: Perform swap (swap display with a display from a reference vehicle) and reassess problem. If the problem relates to the display, replace display. If the problem does not relate to the display, continue with step 3. Step 3: Check electrical wiring harness and video line for routing, breakovers and external damage. Check contact springs and contact sockets for corrosion and bonding (photo documentation in micro view). Check electric wiring harness for conductivity and short circuit, document measurement results in a measurement report or referenced wiring diagram using the CDT four level model. If the wiring harness and the video line is OK, please complete the attached questionnaire, create TIPS case according to list of requirements. Please add the following documents to the TIPS case: • Video of problem • Completed questionnaire • Current quick test with freeze frame results • Measurement report and photo documentation of wiring harness • Control unit log of head unit • Control unit log of instrument cluster • Control unit log of display cluster • Log-files HU-logging (password via TIPS case) • NOTE: Make sure to document the original customer complaint. NOTE: Please refer to this LI in the warranty claim in the "Notes" section. The damage code of the component determined to be the root cause of the symptom must be used in the warranty claim.

The document

• NHTSA's copy of the document (PDF)
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The document is the manufacturer's. This site does not hold it. NHTSA files a document at one of these two addresses; we have not asked NHTSA which.

Components

Electrical system

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