Need info on switch for B/U lights on A4
Thread Starter
Burning Brakes
Joined: Jun 2011
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From: Oakley Ca
Need info on switch for B/U lights on A4
Thanks in advance for your help. Anyone have or can tell me where to get instructions for changing the switch on the A4 tranny for the back up lights. I have checked everything else, bulbs good,fuses good, relay replaced. Have I missed anything. I am new at this and learning as I go so all help is appreciated.
Thread Starter
Burning Brakes
Joined: Jun 2011
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From: Oakley Ca
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Team Owner
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From: Kannapolis NC
Then it's not your backup light switch. The approach lights don't go through it. Look at the diagram above. If neither the b/u or approach lights work, I'd go to checking the bulbs, connectors, or grounds for the b/u lights. The source voltage comes from two different place and through two different fuses. Measure for 12v on the socket, look for corrosion on the ground, most importantly, make sure the bulbs are good. I'm assuming when you said 'relay replaced' you were referring to #38? You could also have a broken wire running to the lights from the fuse box relay connections.
Thread Starter
Burning Brakes
Joined: Jun 2011
Posts: 1,182
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From: Oakley Ca
Then it's not your backup light switch. The approach lights don't go through it. Look at the diagram above. If neither the b/u or approach lights work, I'd go to checking the bulbs, connectors, or grounds for the b/u lights. The source voltage comes from two different place and through two different fuses. Measure for 12v on the socket, look for corrosion on the ground, most importantly, make sure the bulbs are good. I'm assuming when you said 'relay replaced' you were referring to #38? You could also have a broken wire running to the lights from the fuse box relay connections.
Team Owner
Joined: Jul 2006
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From: Kannapolis NC
Have you measured for 12 volts on the bulb contact with the key on and car in reverse? That will tell you if you have a ground or voltage issue. Measure from the bulb contact in the connector to a known ground. Be careful, if it is there, it is easy to short and blow the fuse.
Thread Starter
Burning Brakes
Joined: Jun 2011
Posts: 1,182
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From: Oakley Ca
Have you measured for 12 volts on the bulb contact with the key on and car in reverse? That will tell you if you have a ground or voltage issue. Measure from the bulb contact in the connector to a known ground. Be careful, if it is there, it is easy to short and blow the fuse.
Thread Starter
Burning Brakes
Joined: Jun 2011
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From: Oakley Ca
Tech Contributor
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From: Dyer, IN
Thread Starter
Burning Brakes
Joined: Jun 2011
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From: Oakley Ca
Tech Contributor
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From: Dyer, IN
That is not an acceptable ground. Use a chassis ground point, or run a long wire to the negative battery post.
Continuity does nothing for troubleshooting. You can have continuity, with high resistance, or shorting between wires. If you want to solve problems on a C5, you need a meter.
Continuity does nothing for troubleshooting. You can have continuity, with high resistance, or shorting between wires. If you want to solve problems on a C5, you need a meter.
Thread Starter
Burning Brakes
Joined: Jun 2011
Posts: 1,182
Likes: 1
From: Oakley Ca
That is not an acceptable ground. Use a chassis ground point, or run a long wire to the negative battery post.
Continuity does nothing for troubleshooting. You can have continuity, with high resistance, or shorting between wires. If you want to solve problems on a C5, you need a meter.
Continuity does nothing for troubleshooting. You can have continuity, with high resistance, or shorting between wires. If you want to solve problems on a C5, you need a meter.
Thread Starter
Burning Brakes
Joined: Jun 2011
Posts: 1,182
Likes: 1
From: Oakley Ca
Got a meter, ran a wire from neg battery to the back of the car. turned on key, put car in reverse. Touched red prong to light socket where light touches and black to the ground wire from the battery. I got no reading at all. Hooked meter up to 18V battery and it read 18.3 V just to make sure the meter worked. I tried both connectors and got no reading. Not sure what to do next.
Hope you had a good labor day weekend.
Hope you had a good labor day weekend.