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Battery Drain - Fuse D9 Sound Package

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6 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW

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YOUR RESEARCHBattery Drain - Fuse D9 Sound Package

Reported or suspected cause

fuse d9 'sound package'

Reported cause

No successful repair reported for this finding.

1
Identified cause
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Suspected cause
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Reported fixes
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Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.

Discussions that report identifying a cause
1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Reported cause · Original poster

My late 2004 996 C4S is suffering a battery drain that I have traced to fuse D9 'Sound package'.

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Battery Drain - Fuse D9 Sound Package
Frequently discussed work

Test with the car locked and left

No successful repair reported for this finding.

0
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0
Unsuccessful attempts
1
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Discussions that contain suggestions
1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Suggestion · Original poster

The red/white wire to the amp and CD changer is also live, again tested with the car locked and left for 30+mins, but I think this should be the switched live / wake signal and should therefore be off when the radios off.

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Battery Drain - Fuse D9 Sound Package
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Leading evidence: 'fuse d9 'sound package'' (1 discussions report identifying this cause; no attributable repair resolution). Across 1 matching discussions, the most frequently mentioned possible cause is 'fuse d9 'sound package'' (1 discussions; 1 report identifying it and 0 suggest it). The most frequently discussed action is 'Test with the car locked and left' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.

Source reports, not a diagnosis or a success probability. Counts refer to discussions and can overlap.

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1 matching discussions · 6 captured posts examined · 0 partial discussions

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Test with the car locked and left

Suggestion or failed attempt

No successful repair reported for this finding.

0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context

Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.

Discussions that contain suggestions
1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Suggestion · Original poster

The red/white wire to the amp and CD changer is also live, again tested with the car locked and left for 30+mins, but I think this should be the switched live / wake signal and should therefore be off when the radios off.

Original post Read captured discussion
Battery Drain - Fuse D9 Sound Package

Test would

Suggestion or failed attempt

No successful repair reported for this finding.

0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context

Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.

Discussions that contain suggestions
1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Suggestion · Original poster

Just a thought, if I were to pop pin C4 out of the back of my HU and repeat the draw down test, would that isolate if the issue was the HU or the amp?

Original post Read captured discussion
Battery Drain - Fuse D9 Sound Package
Frequently discussed actions (2)

These are separate views of the same evidence. Frequency alone does not establish a fix, and these counts must not be added together.

Test with the car locked and left

No successful repair reported for this finding.

0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Discussions that contain suggestions
1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Suggestion · Original poster

The red/white wire to the amp and CD changer is also live, again tested with the car locked and left for 30+mins, but I think this should be the switched live / wake signal and should therefore be off when the radios off.

Original post Read captured discussion
Battery Drain - Fuse D9 Sound Package

Test would

No successful repair reported for this finding.

0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Discussions that contain suggestions
1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Suggestion · Original poster

Just a thought, if I were to pop pin C4 out of the back of my HU and repeat the draw down test, would that isolate if the issue was the HU or the amp?

Original post Read captured discussion
Battery Drain - Fuse D9 Sound Package
Reported and suspected causes (1)

These are separate views of the same evidence. Frequency alone does not establish a fix, and these counts must not be added together.

fuse d9 'sound package'

No successful repair reported for this finding.

1
Identified cause
0
Suspected cause
0
Reported fixes
Read evidence and context
Discussions that report identifying a cause
1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Reported cause · Original poster

My late 2004 996 C4S is suffering a battery drain that I have traced to fuse D9 'Sound package'.

Original post Read captured discussion
Battery Drain - Fuse D9 Sound Package
Coverage and how to read this overview

Counts describe captured discussions, not unique people or a diagnosis. Author identities are not reliably stored. Exact duplicate evidence is counted once across matching discussions; one discussion counts at most once per action/state. Multiple repairs reported together remain a combination. Suggestions and failed attempts do not establish a fix. Matches cover whole discussions and can include related faults, model variants and incomplete threads.

6 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.

  • 911uk: 1 discussions

0 evidence records excluded for query context · 0 excluded by outcome qualification · 0 adjusted by outcome qualification.

0 acknowledgements have no verified action link; they do not establish a repair result.

Generation: 20261026T212127Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1 / ORIGINAL POSTEROriginal post

My late 2004 996 C4S is suffering a battery drain that I have traced to fuse D9 'Sound package'. The amp in the frunk seems to be permanently on, as even when the car has been locked for 30+mins the fan is running in it / it is warm to touch. The red/white wire to the amp and CD changer is also live, again tested with the car locked and left for 30+mins, but I think this should be the switched live / wake signal and should therefore be off when the radios off. Does anyone have a wiring diagram for a 2004 with MOST / Bose / PCM or has anyone come across this issue before? Thanks in advance!

POST 3 / ORIGINAL POSTEROriginal post

Thank you! That's brilliant - exactly what I was looking for. What makes you think the amp is at fault rather than the HU? I'd figured the Wake Up Diagnosis vs/cp157 red/white wire should turn on and off with the head unit, and in turn switch the amp? This wires permanently live on my car but I don't know if that's correct or not. Does it go to anything else besides the CD changer and amp? Again, Thank you for your help!

POST 4 / ORIGINAL POSTEROriginal post

Just a thought, if I were to pop pin C4 out of the back of my HU and repeat the draw down test, would that isolate if the issue was the HU or the amp? I could be barking up the wrong tree here though!

POST 5Original post

My answer was based on experience .. i've seen amps cause this but never a PCM so far .. It's still possible though as is anything but logically if the pcm is unplugged and it is the wake up line then the battery drain will go .

POST 6 / ORIGINAL POSTEROriginal post

Thanks, thats great. Time permitting, I'll pull the PCM out this weekend and see what effect that has on the battery drain / amp. Will report back!

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