Planet-9

2008 Cayman S - 0.2 Volts at License Plate Harness? Help!

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Original source

3 captured repliesPartial discussion capture · Source accounts, not a confirmed diagnosis

THIS DISCUSSION / SOURCE-DERIVED OVERVIEW

Discussion summary

YOUR RESEARCH2008 Cayman S - 0.2 Volts at License Plate Harness? Help!

Leading reported evidence

Reset rear control module

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
Resetting the rear control module?
Original post Read captured discussion
2008 Cayman S - 0.2 Volts at License Plate Harness? Help!

Frequently discussed work

Clean contacts

No successful repair reported for this finding.

0
Reported fixes: 1
Unsuccessful attempts: 1
Discussions

Read evidence and context

Discussions that report an unsuccessful attempt: 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.

Unsuccessful attempt
-Cleaned contacts... no change
Original post Read captured discussion
2008 Cayman S - 0.2 Volts at License Plate Harness? Help!

Read full discussion summary

Leading evidence: 'Reset rear control module' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Clean contacts' (1 discussions). For that action, 0 discussions report a resolution and 1 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 · 3 captured posts examined · 1 partial discussions

Compare 1 other evidence results

Clean contacts

Suggestion or failed attempt

No successful repair reported for this finding.

0
Reported fixes: 1
Unsuccessful attempts: 1
Discussions

Read evidence and context

Discussions that report an unsuccessful attempt: 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.

Unsuccessful attempt
-Cleaned contacts... no change
Original post Read captured discussion
2008 Cayman S - 0.2 Volts at License Plate Harness? Help!

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.

Clean contacts

No successful repair reported for this finding.

0
Reported fixes: 1
Unsuccessful attempts: 1
Discussions

Read evidence and context

Discussions that report an unsuccessful attempt: 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.

Unsuccessful attempt
-Cleaned contacts... no change
Original post Read captured discussion
2008 Cayman S - 0.2 Volts at License Plate Harness? Help!

Reset rear control module

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
Resetting the rear control module?
Original post Read captured discussion
2008 Cayman S - 0.2 Volts at License Plate Harness? Help!

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.

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

Planet-9: 1 discussions

0 evidence records excluded for query context · 1 excluded by outcome qualification · 0 adjusted by outcome qualification.

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

Generation: 20261027T000231Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1Original post

Im hoping someone out there can help me... Im stumped Recently bought a 2008 Cayman S . Discovered a week later my rear license plate is not illuminated. Im getting VERY little voltage to the lights (hence they wont light up). With car switched "ON" and headlights "ON" I get 0.2V at the rear license harness (grey wire). 0.0V with lights turned "off". I removed the rear bumper and checked at the connector there as well... same thing 0.2V What other possibilities are there to look at? Resetting the rear control module? -All fuses are good (paid special attention to row A, #6,7,&8 -0.2V @ rear harness -Ground under rear carpet looks good -Dash lights work fine (seemed to go hand in hand with a bad headlight switch) -All other lighting works fine -Cleaned contacts... no change I appreciate any assistance... right now im limited to driving during daylight hours only. *also hello to planet 9.... hate to make my first post a "help me" thread... but i searched all over with no resolution in sight SOLVED: After some trial and error investigating, the rear control modules are smarter than I anticipated. It will not supply 12V to the lights if it doesn't sense any resistance. Therefore, only 0.2V was detected when using a multimeter on the harness. Once bulbs are plugged in and providing resistance, the rear control module sends the full 12V required.

POST 2Original post

So was the root of the no license plate lights a bad headlight switch?

POST 3Original post

Nope. The switch was fine. The wiring harness will not supply 12V unless there is a load. So if you just try and stick a multimeter into the harness... you won't see any voltage. Once the system detects a load (the light bulb), it supplies the 12V just fine.

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