Porsche Club GB

Poor Heated Rear Screen

Add to repair workspace

New repair projectOpen repair workspace

Original source

6 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis

THIS DISCUSSION / SOURCE-DERIVED OVERVIEW

Discussion summary

YOUR RESEARCHPoor Heated Rear Screen

Leading reported evidence

Check under warranty last year

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
I had this checked under warranty last year but they said it was fine/normal, but surely I should expect the winscreen to actually clear ?
Original post Read captured discussion
Poor Heated Rear Screen

Read full discussion summary

Leading evidence: 'Check under warranty last year' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Check under warranty last year' (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.

Read captured replies

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

Compare 3 other evidence results

Run & hrw turned

Suggestion or failed attempt

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
With engine running & HRW turned on check that you have at least 12 V going into the screen and just as important 0 V going down the earth wire.Cheers.
Original post Read captured discussion
Poor Heated Rear Screen

Run across the screen

Suggestion or failed attempt

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
Hi There you only need to gently touch each side of the heater elements which run across the screen.
Original post Read captured discussion
Poor Heated Rear Screen

Use of a multimeter

Suggestion or failed attempt

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
Try & get the use of a multimeter , set it to volts.
Original post Read captured discussion
Poor Heated Rear Screen

Frequently discussed actions (4)

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

Check under warranty last year

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
I had this checked under warranty last year but they said it was fine/normal, but surely I should expect the winscreen to actually clear ?
Original post Read captured discussion
Poor Heated Rear Screen

Run & hrw turned

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
With engine running & HRW turned on check that you have at least 12 V going into the screen and just as important 0 V going down the earth wire.Cheers.
Original post Read captured discussion
Poor Heated Rear Screen

Run across the screen

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
Hi There you only need to gently touch each side of the heater elements which run across the screen.
Original post Read captured discussion
Poor Heated Rear Screen

Use of a multimeter

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
Try & get the use of a multimeter , set it to volts.
Original post Read captured discussion
Poor Heated Rear Screen

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.

Porsche Club GB: 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: 20261027T031046Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1 / ORIGINAL POSTEROriginal post

Having put the hardtop back on and the weather getting worse I have noticed again that the heated rear screen really is quite poor. On an hours drive last night it failed to clear the screen. I had this checked under warranty last year but they said it was fine/normal, but surely I should expect the winscreen to actually clear ?

POST 2Original post

My hardtop screen works as well as the one in my Audi. Never had an issue.

POST 3Original post

This may seem to be a silly comment, but is the screen really clean? If the screen isn't well polished there's a good chance that the heater won't do its job properly. Just a thought.

POST 4Original post

Try & get the use of a multimeter , set it to volts. With engine running & HRW turned on check that you have at least 12 V going into the screen and just as important 0 V going down the earth wire.Cheers.

POST 5Original post

Where's the contact point between the HRW circuit in the car, and the HRW on the hard top?

POST 6Original post

Hi There you only need to gently touch each side of the heater elements which run across the screen. One side should have 12V and the other 0V. If you have 12V at both sides then the earth wire is broken ( If so I will tell you where to look) if this is the case the HRW will not work at all but the switch & warning light could. If there is some voltage down the earth IE 5 or 6 V then there is a poor earth . Good luck & let me know.

This is a source reference. Confirm exact model applicability in the original material.