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R171 Fuse and relay locations and pics and descriptions

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102K views 15 replies 6 participants last post by  jbanks15  
#1 · (Edited)
#3 ·
Morning all ...

The front SAM does look after the turn signals ... there's no relay for the turn signals by the look of things

Do the hazards work ..? (from the switch in the centre of the dash)
 
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#6 ·
Apologies - should've mentioned what the were

Difficult to diagnose without hooking the car up to DAS (The computer based diagnostics) and costly to fault find purely by replacing suspected modules (which still need coding with DAS anyways)

Sounds like one or more of the following have been damaged by the reverse power hook up ..

Front SAM
UCP (Upper control panel - has the hazard switch in the middle)

What else doesn't work ..?
The roof switch, mirror adjustments and alarm features (if fitted) all go through the UCP

Wipers and washers are via the front SAM, as are the front lights and a few other bits on the front of the car..

You're going to need a diagnostic session ....
 
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#7 ·
Hi @jbanks15 @Seanhump, Looking at the "Fuse Functions" tables from post #1 I notice that some items appear to not have a fuse number. For example front & rear foglights in the fuse number column it says "electronic". I was wondering how these circuits are protected if they are not fused? Are some circuits purely protected via Canbus and not fused as such?
 
#11 ·
Afternoon

The fuse for the fogs is electronic - it's in the Front SAM - it'll reset it's self when (assuming it's been blown) the short is no longer present.
 
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#15 · (Edited)

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