Planet-9

PCM 3.1 Wire Harness: Which pin/wire is Reverse, Speedometer, Illiumination?

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YOUR RESEARCHPCM 3.1 Wire Harness: Which pin/wire is Reverse, Speedometer, Illiumination?

Leading reported evidence

Run wire

Performed · outcome unconfirmed

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
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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 performed work without a confirmed outcome: 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.

Performed · outcome unconfirmed
For Revere light, I tapped into the Blue / Black wire in the Trunk wire bundle on the left side under the carpeting and ran the wire to the front radio.
Original post Read captured discussion
PCM 3.1 Wire Harness: Which pin/wire is Reverse, Speedometer, Illiumination?

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

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1 matching discussions · 2 captured posts examined · 1 partial discussions

Frequently discussed actions (1)

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

Run wire

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
Discussions

Read evidence and context

Discussions that performed work without a confirmed outcome: 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.

Performed · outcome unconfirmed
For Revere light, I tapped into the Blue / Black wire in the Trunk wire bundle on the left side under the carpeting and ran the wire to the front radio.
Original post Read captured discussion
PCM 3.1 Wire Harness: Which pin/wire is Reverse, Speedometer, Illiumination?

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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.

2 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 · 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: 20261026T165820Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1Original post

I am installing a Pioneer AVIC-8201 in my 2013 Boxster 987 that did not have navigation installed. I bought the highly recommended Suncoast after-market radio installation kit (standard) and am very close to finished. The problems? Two wires remain unattached: "reverse" for the back-up camera and "speedometer" to increase volume at higher speeds. Also, there is not enough room to push the radio in completely with the aftermarket harness. I can't tap into either "reverse light" fuse for the back-up camera since those fuses also control the rear lighting. I could tap into the "instrument panel" fuse for the speedometer, but I am not convinced this connection will not truly connect to pulsed speedometer readings. I also have the "illumination" wire that I have tapped to the appropriate fuse, but I'd rather not have so much fuse-tapping. It makes much more sense to pin these wires directly into the existing wire harness that used to connect to the PCM 3.1 . However, I don't know which harness wire is which! Based on the after-market harness. the only pins to which these spare wires could attach are in the blue and/or green slots (see photos). The first 3 show orientation on the existing wire harness, the last two show close-up from the underside of green, then underside of blue. I can solve both of my problems by pinning wires straight into the existing harness, I just need to know which existing harness wire is "reverse," "speedometer" and "illumination." Any ideas? Thank you!

POST 2Original post

There is NO speedometer wire in the harness. You will have to tap into the ABS control module in the Frunk. I could not find the correct wire so I did not connect it. BTW if you have a 2013 Boxster , you have a 981 NOT a 987. For Revere light, I tapped into the Blue / Black wire in the Trunk wire bundle on the left side under the carpeting and ran the wire to the front radio. This wire does not lead into the wiring harness either.

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