Hello and Antara issue, charging problem - Vauxhall Antara Forums
 
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post #1 of 7 (permalink) Old 9th December 2019, 19:03 Thread Starter
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Hello and Antara issue, charging problem

Hey thought i would sign up as this is going to be the easiest way to find a solution hopefully to a ongoing issue with a car we are working on, i would love to see if this forum can help me get this sorted.

We have in a 2008/09 2.2di Antara and the issue wa had was non starter, after a battery test and alternator test with a new battery fitted found the alternator not to be charging the battey but no light on the dash to indicate the alternator to switch and activate charging. After a bulb test on the old alternator found that the alternator was not activating thus not charging the new battery.

After fitting a new alternator found that the alternator could be switched to charge battery only during a small current bulb test.

The wiring coming in from the ecu to switch the alternator to charge showed 12v and when earthed would turn the battery light off thus making is look like a earth issue on the engine.

New earth fitted and old tested, all ok but when the connector is fitted back onto the alt it still doesnt switch the alternator to charge the new battery.

Yet if i bulb test the alternator it switches and charges the battery.

I am stuck as look to chase my tail with it looking like the feed from ecu is good enough but not powerfull enough to switch the alternator?

Any ideas if there is a common problem along these lines and what can be done to fix? Possibly test the ecu?
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post #2 of 7 (permalink) Old 12th December 2019, 21:45
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Just to check, and back to basics, (as it's not obvious to me from the above) with just IGN on does the red warning light on the dash show on? Does it stay on after engine start? If it is never on have you considered the warning light bulb has blown? I believe that is required to excite coil. I'd upload the charging circuit diagram for your further guidance...but Admin is taking forever sorting out pic upload problem!

2012 Antara 2.2 Auto AWD
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post #3 of 7 (permalink) Old 12th December 2019, 23:02
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Following on from above...
Both the dash warning lamp AND the BCM both output to the ECM

and from the manual....
BCM communicates with the engine control module (ECM) and the instrument panel
cluster for electrical power management (electrical power management) operation. The BCM determines the output of the generator and
sends the information to the ECM for control of the generator turn on signal circuit. It monitors the generator field duty cycle signal circuit
information sent from the ECM for control of the generator. It monitors a battery current sensor, the battery positive voltage circuit, and
estimated battery temperature to determine battery state of charge. The BCM performs idle boost.
------------------------------------------------------------------------------------------------------
The BCM will enter Charge Mode when ever one of the following conditions are met.
The wipers are ON for than 3 seconds.
GMLAN (Climate Control Voltage Boost Mode Request) is true, as sensed by the HVAC control head. High speed cooling fan, rear
defogger and HVAC high speed blower operation can cause the BCM to enter the Charge Mode.
The estimated battery temperature is less than 0C (32F).
Battery State of Charge is less than 80 percent.
Vehicle speed is greater than 145 km/h (90 mph)
Current sensor fault exists.
System voltage was determined to be below 12.56 V

When any one of these conditions is met, the system will set targeted generator output voltage to a charging voltage between 13.9-15.5 V, depending on the battery state of charge and estimated battery temperature.

Hope some of that helps you!

2012 Antara 2.2 Auto AWD
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post #4 of 7 (permalink) Old 16th December 2019, 15:05
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Chris What does BCM stand for
Richy
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post #5 of 7 (permalink) Old 17th December 2019, 02:08
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BCM = Body Control Module. Sequence is IGN switch - BCM - ECM which outputs to ALT & starter relay.
OP note: ECM is grounded via ALT & NSBU (Neutral Start) s/w (on A/T) according to my diagram.
(Admin: which I still cannot post on this forum!!)

2012 Antara 2.2 Auto AWD
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post #6 of 7 (permalink) Old 17th December 2019, 09:02
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Hi Chris, I was racking my brains to think what BCM stood for, you appear a person who is very knowledgeable on these car.

Somewhere in the back of my mind, as a containment, do alternators kick out a default charge voltage when the control cables are disconnected. So if a person had a problem and was broken down, could this be temporarily disconnected to keep the battery charged.
Richy
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post #7 of 7 (permalink) Old 17th December 2019, 21:50
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Richy thanks for the compliment but not all! Just looking at the starter circuit diagram. As for your question I'm really not sure having never done that. My understanding is that the coil has to be excited (turned on signal) and without that then the alternator would not output anything. The excitation, I think, is achieved via the warning light which, as I said above is required to function.

Nothing personal but I'll leave it at that as there's been no response from the OP. That is true of several recent posts I've noticed. People get a problem, post on here just once and don't even bother or have the decency to follow up. Why bother to help them? And the Admin support is severely lacking IMHO!

2012 Antara 2.2 Auto AWD
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