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ABS light

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paulr4
L Plate Warrior



Joined: 04 Oct 2021
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PostPosted: 11:38 - 04 Oct 2021    Post subject: ABS light Reply with quote

I recently bought a 2004 Honda CBF500, my first bike with ABS. On getting it home and reading the manual, I see the ABS light is supposed to light up on ignition and then go out above 10mph or so. Might doesn't light up, ever.

I checked the fuses, in case they'd been removed to mask a problem. The 3 in the ABS fusebox under the right-hand side panel are all present and correct.

Delving deeper into the bike I was able to disconnect the rear sensor and measured a resistance of 6.7MOhms across it, much higher than some light googling suggests it should be. However, the symptom of a bad sensor should be a flashing warning light, not no light at all. The voltage from the controller side of the sensor connector was about 2.5V.

Can anyone advise what to try next?
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Nobby the Bastard
Harley Gaydar



Joined: 16 Aug 2013
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PostPosted: 11:40 - 04 Oct 2021    Post subject: Reply with quote

See if the bulb is blown.
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xX-Alex-Xx
World Chat Champion



Joined: 12 Sep 2019
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PostPosted: 12:01 - 04 Oct 2021    Post subject: Reply with quote

Does the ABS actually work? Pretty easy to try to lock the rear to test.
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weasley
World Chat Champion



Joined: 16 Oct 2010
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PostPosted: 14:50 - 04 Oct 2021    Post subject: Reply with quote

Someone may have removed the ABS bulb to mask a problem.
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paulr4
L Plate Warrior



Joined: 04 Oct 2021
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PostPosted: 16:12 - 04 Oct 2021    Post subject: Reply with quote

I'll dismantle the dash next chance I get to see if the bulb is the issue. As for testing it, I did try stamping on the rear brake but it felt a bit squashy and couldn't get the rear wheel to lock up. Perhaps that's another problem I should be looking at! Confused
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MCN
Super Spammer



Joined: 22 Jul 2015
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PostPosted: 18:01 - 04 Oct 2021    Post subject: Reply with quote

My bikes have LED lamps so a bulb issue would be unlikely LED are more reliable.
Rather than a bulb blown it may be a wire broken or a plug pulled.
Normally, ABS are designed to be very robust and should auto/self-test when ignition is switched on.
The ABS lamp should continue to flash until the wheel sensors are detected boy moving the bike to rotate the wheels 1 turn.
It probably needs a Honda tool or a tool that can read Honda to diagnose that fault.
The brake should still work but depending on the system the ABS being disconnected to put the lamp out is serious. It may not make the brake fail but it could let full pump pressure onto the brake when you pull the lever. Sudden uncontrollable braking is risky.
Mixed with winter roads and Cooncil grit.
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Disclaimer: The comments above may be predicted text and not necessarily the opinion of MCN.
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