Troubleshooting - MB QUART QB250 BMW1 User Manual

ENG
TROUbLE SHOOTINg
If you are having problems after installation follow the trouble shooting procedures below.
Procedure 1:
Check.the.device.for.proper.connections.
Verify.that.the.LED.(.7.).lits.up.blue..If.the.LED.lits.up.blue.skip.to.Step.3,.if.not.continue.
1... Check.the.fuses.of.the.device.or.the.external.fuse.on.battery.positive.cable..Replace.if.necessary.
2... Verify.that.Ground.connection.is.connected.to.clean.metal.on.the.vehicle's.chassis..Repair/replace.if.necessary.
. Please.ensure.that.you.have.reconnected.the.GND.connection.at.the.battery.after.the.installation.
3... Verify.that.there.are.11.to.15.Volts.present.at.the.positive.battery.and.remote.turn-on.cable..Verify.quality.connections.for.both.cables.at.device,.
. headunit.and.battery/fuseholder..Repair/replace.if.necessary..Check.that.the.vehicle.charging.system.is.maintaining.proper.voltage.
Procedure 2:
The.LED.(.7.).lits.up.red.
1... If.the.LED.lits.up.red,.this.is.a.sign.of.overheating.and.driving.the.device.at.very.high.power.levels.without.adequate.airflow.around.the.device..
. Shut.off.the.system.and.allow.device.to.cool.down..If.the.previous.items.do.not.solve.the.problem,.a.fault.may.be.in.the.device.
. Check.that.the.vehicle.charging.system.is.maintaining.proper.voltage.
Procedure 3:
Check.the.device.for.a.proper.audio.signal.
1... Verify.good.RCA.input.connections.at.headunit.and.device..Check.entire.length.of.cables.for.kinks,.splices,.etc..
. Test.RCA.inputs.for.AC.volts.with.stereo.on..Repair/replace.if.necessary.
2.. Use.another.audio.source.for.testing.to.provide.an.audio.signal.to.the.Line.Input.
3.. If.you.use.high.level.speaker.inputs,.check.the.polarity.
Procedure 4:
Check.the.device.for.a.popping.noise.while.turning.on.
1... Disconnect.input.signal.to.device.and.turn.device.on.and.off.
2... If.the.noise.is.eliminated,.connect.the.REMOTE.lead.of.device.to.source.unit.with.a.delay.turn-on.module.
OR
1... Use.a.different.12.Volt.source.for.REMOTE.lead.of.the.device.(e.g..battery.direct.just.for.testing).
2... If.the.noise.is.eliminated,.use.a.relay.to.isolate.the.device.from.noisy.turn-on.output.
3.. Don't.connect.REMOTE.directly.to.the.battery.after.testing.to.avoid.a.discharge.of.the.battery.
Procedure 5:
Check.the.device.if.you.experience.excess.Engine.Noise.
1... Route.all.signal.carrying.wires.(RCA,.Speaker.cables).away.from.power.and.ground.wires.
OR
2... Bypass.any.and.all.electrical.components.between.the.headunit.and.the.device..Connect.the.headunit
. directly.to.input.of.the.device..If.noise.goes.away.the.unit.being.bypassed.is.the.cause.of.the.noise.
OR
3.. Use.another.audio.source.for.testing.to.provide.an.audio.signal.to.the.Line.Input.
OR
4... Remove.existing.ground.wires.for.all.electrical.components..Reground.wires.to.different.locations.
. Verify.that.grounding.location.is.clean,.shiny.metal.free.of.paint,.rust.etc.
OR
5... Add.secondary.ground.cable.from.negative.battery.terminal.to.the.chassis.metal.or.engine.block.of.vehicle.
OR
6... Have.alternator.and.battery.load.tested.by.your.mechanic.Verify.good.working.order.of.vehicle.electrical.system.including.distributor,.
. spark.plugs,.spark.plug.wires,.voltage.regulator.etc.
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