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Old 06-18-2018, 12:36 PM   #1
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Brake Fluid Warning Light

Both the brake fluid warning light along with the PSM light are on. This occurred immediately after I disconnected the positive lead of the battery while installing a new amp for the stereo. Brake fluid is completely full, even slightly above the full line and has been that way for a year. I was working in the the front trunk passenger side and up under the dash. Anything I bumped or disconnected? I completely bypassed the factory amp wiring as well. My research so far indicates the PSM light is on only because the brake fluid light is on.

Suggestions on fixing this?

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Old 06-18-2018, 12:39 PM   #2
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I got those two lights when the fuse was blown for my PSM (Fuse E9 I think). I have also read that the system is sensitive to low voltage.
Search and see stuff like this: https://rennlist.com/forums/997-forum/719848-psm-failure-after-battery-disconnect.html
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Last edited by 78F350; 06-18-2018 at 12:42 PM.
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Old 06-18-2018, 12:53 PM   #3
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The large connector on the factory amp, has a pretty large power in line, and some control signals.
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Old 06-18-2018, 07:23 PM   #4
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Checked the PSM fuses- all were good.
Pluged the cables back into the Hays amp-brake fluid light still comes on.
Disconnected negative battery terminal and reconnected-light still comes on.

What else?
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Old 06-21-2018, 05:39 AM   #5
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I think my issue is the fluid level electrical connection at the bottom of the reservoir. The yellow connector is broken.

Can the sensor and connector be replaced independently of the reservoir?

If I disconnect the plug, can I jump the two wires in the connector to verify this is my issue?



A friend used is Durametric scanner, this is all we got:
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Old 06-21-2018, 11:23 AM   #6
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Just a quick question - did you clear the codes or are you assuming that the codes will clear by themselves once the problems have been resolved?

At least on my Boxster, just disconnecting and reconnecting the battery will sometimes set a code or two (A/C, IP, Airbag, who knows...) SO, any time I disconnect the battery I run through all the systems using my Durametric and clear any codes that were set... If they come back after clearing them, then, and only then, do I suspect a problem...
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Old 06-21-2018, 02:23 PM   #7
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Quote:
Originally Posted by BirdDog View Post
Just a quick question - did you clear the codes or are you assuming that the codes will clear by themselves once the problems have been resolved?
I cleared the codes and it comes right back on.

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