Always On reverse lights
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Cross-Country
Joined: May 2005
Posts: 84
Likes: 7
From: Middle TN
Always On reverse lights
2002 Limited and my reverse lights stay on all the time no matter what gear the lever is in. As soon as the truck starts the lights will come on and not go off until the truck is turned off. Any ideas?
Post Fiend
Joined: Feb 2011
Posts: 26,410
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From: Ft. Lauderdale, FL
Leetudor, I'm sorry I don't have the answer for you.
But thanks for posting, I go to Tenn. several times per year.
Back in the 70's we called these racing lights, so now I know not to pull up to your Ex and rev my engine.
But thanks for posting, I go to Tenn. several times per year.
Back in the 70's we called these racing lights, so now I know not to pull up to your Ex and rev my engine.
Junior User
Joined: Jan 2011
Posts: 70
Likes: 0
From: Norris, TN
leetudor,
The +12 feed for the reverse lights come thru the DTR (digital transmission range) sensor located on the DS of the transmission. It passes the +12 thru the switch when reverse is selected and goes from there to the reverse lamps.
It also is sent to the tow relay and the Electrochromatic inside mirror if you have one (not sure what it is used for there).
ON the connector to the DTR, +12 is on pin 9 LB/PK and reverse comes out pin 11 BK/PK.
I would pull the tow relay and disconnect the mirror just to be sure neither of these is affecting the circuit.
Good luck.
Tom
The +12 feed for the reverse lights come thru the DTR (digital transmission range) sensor located on the DS of the transmission. It passes the +12 thru the switch when reverse is selected and goes from there to the reverse lamps.
It also is sent to the tow relay and the Electrochromatic inside mirror if you have one (not sure what it is used for there).
ON the connector to the DTR, +12 is on pin 9 LB/PK and reverse comes out pin 11 BK/PK.
I would pull the tow relay and disconnect the mirror just to be sure neither of these is affecting the circuit.
Good luck.
Tom
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Cross-Country
Joined: May 2005
Posts: 84
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From: Middle TN
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Cross-Country
Joined: May 2005
Posts: 84
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From: Middle TN
Drove it yesterday and found out that the reverse sensors are on all of the time also. Would that have something to do with the gear selector or the reverse switch on the transmission?
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Junior User
Joined: Jan 2011
Posts: 70
Likes: 0
From: Norris, TN
leetudor,
The +12v that comes thru the DTR also feeds the Parking Aid Module (PAM) if you have that option.
That module is located in the right rear quarter panel.
To troubleshoot, I would disconnect the output wire from the DTR and see if the +12 is present on the DTR output pin when the shifter is not in reverse (please, for safety sake do not have the engine running to check this
). It can safely be done with just the ignition switch on.
Depending on that reading will determine what troubleshooting steps to take next.
Good luck.
Tom
The +12v that comes thru the DTR also feeds the Parking Aid Module (PAM) if you have that option.
That module is located in the right rear quarter panel.
To troubleshoot, I would disconnect the output wire from the DTR and see if the +12 is present on the DTR output pin when the shifter is not in reverse (please, for safety sake do not have the engine running to check this
). It can safely be done with just the ignition switch on.Depending on that reading will determine what troubleshooting steps to take next.
Good luck.
Tom
Junior User
Joined: Jan 2011
Posts: 70
Likes: 0
From: Norris, TN
If you are talking about the PAM, the connector diagrams I have (for 2002) show this module in the right rear quarter panel under the air unit.
I have not been in that section myself.
Can you see anything under the unit back there?
Have you had a chance to check the DTR?
I have not been in that section myself.
Can you see anything under the unit back there?
Have you had a chance to check the DTR?
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