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2007 chevrolet express, alarm, light flash

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Member - Posts: 8
Member spacespace
Joined: February 08, 2007
Location: United States
Posted: April 10, 2007 at 4:06 PM / IP Logged  

I'm having a problem with parking light flash when setting the alarm.

The alarm works perfectly except for no light flash. The parking light wire from the "brain" sends + to a polarity reversing relay which sends -  to the BROWN / white at the light switch. The Audiovox sheet shows this wire+ but I don't think that is correct. I read -  on the BROWN / white all the time. When testing from + to BROWN / white I read 12V. when the light switch is off,  and 9.6V. with the switch on.

Silver - Posts: 397
Silver spacespace
Joined: November 04, 2005
Posted: April 10, 2007 at 4:43 PM / IP Logged  
if its a pos wire:
read ground when off and 12 volts when on
if a neg wire:
read 12 volt when off and gound when on
not sure of what you are reading on your meter
please explain the wire and location and what it reads when on and off
what system are you installing?
Member - Posts: 8
Member spacespace
Joined: February 08, 2007
Location: United States
Posted: April 10, 2007 at 6:01 PM / IP Logged  

System installed is Barreta B6000, purchased from

When setting the alarm, the white lead from the "brain" is sending + pulses. This should flash the parking lights. I see the pulses on my analog meter when testing from the white lead (positive) to chassis ground.

The Audiovox wiring sheet shows parking light wires as white (at BMC grey connector pin B2) to be negative. It shows BROWN / white (at parking light switch) to be positive. However BROWN / white tests negative. With lights on, and DMM red lead on battery positive and black lead on the BROWN / white lead 12V. is indicated on the meter. I installed a polarity reversing relay to accept the positive pulse and close the relay contacts to send negative to the BROWN / white. The lights still don't flash.

Chris Luongo 
Platinum - Posts: 3,751
Platinum spaceThis member consistently provides reliable informationspace
Joined: May 21, 2002
Location: Massachusetts, United States
Posted: April 10, 2007 at 6:55 PM / IP Logged  
--I belive there are two BROWN / white wires at the headlamp switch.
If you're on one that tests as positive, that's the dash-dimmer wire. It'll show different voltages based on the position of the dimmer. You're lucky you haven't burned out the dimmer switch yet.
--I prefer using the hazards on these vans anyway, as they're brighter, and just as easy to connect to.
The hazards wire is negative-trigger, medium-sized white wire.
It can be found in the main harness coming down the steering column, with the ignition wires.
Can also get it at the turn-signal flasher, which is clipped to the backside of the dash, above the engine doghouse, to the left of the radio........turn the hazards on, and you'll hear/feel the flasher clicking.
--Also, remove the wire you have connected from the relay to the van. Test the output of the wire with your meter to verify that your relay is wired up correctly.
Member - Posts: 8
Member spacespace
Joined: February 08, 2007
Location: United States
Posted: April 14, 2007 at 8:57 AM / IP Logged  

Appreciate the info Chris. You were right on the money. Checked the flasher wires and found the smaller white wire flashed the hazard lights when negative was applied. Hooked the horn output from the brain (which is negative output) directly to the white and all worked properly. This also allowed elimination of the polarity reversing relay that was being used previously.

Many thanks!posted_image

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