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2000 Honda Accord No communication in the car

Tiny
KHLOW2008
  • MECHANIC
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No, the Multiplex Control System is not the ECU/PCM. It is more commonly known as BCM ( Body Control Module ) and would not trigger any codes on the CEL.
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Saturday, August 28th, 2010 AT 12:12 PM
Tiny
DD_110588
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Ok well I did what you told me and when I ground the blue & white wire the light gets brighter but it does not shut off when I put the ignition on
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Saturday, August 28th, 2010 AT 1:32 PM
Tiny
KHLOW2008
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If it is the door/safety indicators lights that are not turning off, then the Multiplex control unit has a fault. If it is the alternator charge light that stays on brighter, then it is not a problem with the alternator circuit.

If the charge indicator light is not fully bright when ignition switch is turned on and becomes fully bright after disconnecting and grounding the circuit, the alternator is the cause of it. The voltage regulator circuit is bad.
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Saturday, August 28th, 2010 AT 2:18 PM
Tiny
DD_110588
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So where is the voltage regulator circuit at?
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Sunday, August 29th, 2010 AT 12:43 PM
Tiny
KHLOW2008
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The voltage regulator in inside the alternator.
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Sunday, August 29th, 2010 AT 1:12 PM
Tiny
DD_110588
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So what now then?
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Monday, August 30th, 2010 AT 9:29 AM
Tiny
KHLOW2008
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I have been telling you to get the alternator replaced to test but you have refused to do so.

What else do you expect me to tell you?
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Monday, August 30th, 2010 AT 10:34 AM
Tiny
DD_110588
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Ok ill change and ill let you know
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Monday, August 30th, 2010 AT 12:08 PM
Tiny
DD_110588
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Hey I put the original one back on and ive never noticed this but when I put the ignition on all the light come on even the battery one and after a few seconds the battery light starts fadding away slowly.
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Tuesday, August 31st, 2010 AT 3:43 PM
Tiny
KHLOW2008
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After starting if the charge indicator light remains on dimly. The alternator regulator circuit is bad.

Get another alternator to test. DO NOT reuse any of those you have tried.
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Wednesday, September 1st, 2010 AT 8:35 AM
Tiny
DD_110588
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The old alternator was bad and the one I bought was good. But I figured it out, there was a bad connection between the harness from the engine to the one that goes in the dash and it was the black and yellow connection.
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Wednesday, March 16th, 2011 AT 7:43 PM
Tiny
KHLOW2008
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Black/Yellow wire is the main ignition switch wire for power supply to all electrical components. This means your test for continuity and power supply for the charging system was not done correctly.

Glad to know you have fixed the problem.

Have a nice day.
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Thursday, March 17th, 2011 AT 7:17 PM

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