http://zeromanual.com/history/12V_Power_Always_On?feed=atom&12V Power Always On - Revision history2024-03-29T08:47:10ZRevision history for this page on the wikiMediaWiki 1.27.0http://zeromanual.com/index.php?title=12V_Power_Always_On&diff=5955&oldid=prevBrianTRice: ingition switch2020-02-19T05:52:51Z<p>ingition switch</p>
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When the entire 12V circuit stays, ''despite'' keying the bike off and disconnecting charging sources.<br />
: This may be continuous or intermittent.<br />
<br />
; Related Confirming Symptoms<br />
: With the ignition is keyed '''off''', the key removed, and the bike unplugged from charging sources:<br />
* Headlamp and running/brake light are ''both'' '''on'''.<br />
* [[Gen2/Instrument Cluster|Dash/instrument cluster]] backlight is '''on''' but the bike '''does not operate'''.<br />
<br />
; Potential Causes<br />
* [[Ignition Switch]] is faulty.<br />
* [[DC-DC 12V Converter]] is faulty.<br />
* [[MBB]] is faulty, sending an enable signal to the DC-DC converter.<br />
<br />
;Risks<br />
: This will slowly drain the battery.<br />
:: A continuous use of the headlamp might drain the battery in a week's time or less.<br />
:: Time to discharge (hours) = SoC (%) / 100 &times; capacity (kWh) &times; 1000 / 55W.<br />
: If the condition is a result of a short circuit around the [[DC-DC 12V Converter]], it may over-discharge the [[MBB]], causing failure of that critical component.<br />
:: So try to diagnose and solve this problem as soon as possible!<br />
<br />
;Troubleshooting<br />
# With the bike keyed off, check the voltage across the [[Ignition Switch]], ''or'' check if the [[MBB]] is on and whether it reports in the [[MBB Console|console]] that the ignition switch is shut.<br />
# With the bike keyed off and unplugged, access the [[DC-DC 12V Converter]] connector with a voltmeter that has needle probes.<br />
#: On the [[SDS Platform]], you'll need to [[SDS Platform/Board Mounting Plate Removal|remove the board mounting plate]].<br />
# Verify the battery [[State of Charge]] via input/bus voltage:<br />
#: Check voltage present between (+) pin 2 and (-) pin 3.<br />
#: This should be between 95V and 116.2V, and roughly indicates [[State of Charge]].<br />
# Test whether the [[MBB]] is sending the enable signal:<br />
#: Check voltage between (+) pin 1 and (-) pin 3.<br />
#: If this is ''zero'', then the [[DC-DC 12V Converter]] is '''faulty''' independent of the [[MBB]].<br />
#: If this is ''not zero'', then the [[MBB]] is enabling the [[DC-DC 12V Converter]], and is '''faulty'''.<br />
# Confirm output from the [[DC-DC 12V Converter]]:<br />
#: Check 12-14V present between (+) pin 4 and (-) pin 5.<br />
# Test whether the [[DC-DC 12V Converter]] responds to the enable signal:<br />
#: Connect pin 1 directly to pin 2 using a piece of cable.<br />
#: Connect power to (+) pin 2 and (-) pin 3.<br />
#: This should transmit high voltage to the enable input at pin 1, and should make the [[DC-DC 12V Converter]] work if it is functional.<br />
<br />
If the [[DC-DC 12V Converter]] is faulty with the [[MBB]] okay, then the bike should run normally, but with a [[Loss of 12V Power]].<br />
<br />
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[[Category:Symptom]]</div>BrianTRice