Crazy DC wiring... Grrrr...
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This gets involved, so pay close attention...
Well, on my 98. 5 will ALL of the same options as my 2001, the halo light on the ignition switch would light up. On my 2001, it does not light up, despite the bulb being there. I checked the bulb and it's OK. So off to my trusty 1998 and 2001 service manuals. The connection in question is the "Ignition Switch C2" plug. Here's the differences between 1998. 5 and 2001:
1998:
Pin 1: G75 22TN Left door ajar switch sense
Pin 2: G26 22LB Key in ignition switch sense
Pin 3: M1 22PK Fused B+
Pin 4: M50 22YL/RD Halo lamp driver
2001:
Pin 1*: G75 22TN Driver door ajar switch sense
Pin 1**: Z3 22BK/OR Ground
Pin 2: G26 22LB
Pin 3: No connection
Pin 4: No connection
*IEM
**CTM
Apparently, if Pin #1's wire is connected to the CTM, it is a ground. If it is connected to the IEM (Integrated ELectronic Module), it is a driver door switch sense. My ETH uses the setup with the BK/OR ground wire in Pin #1.
After I unplugged this connector with the 2 wires, it made a small difference. First thing I noticed was I could lock the doors using the power lock button when the key in the ignition and the engine off. Minor difference, but I like the feature. So basically what I wanted to do was get the halo lamp working, and retain the chime and have it function like my 98. 5 did. I liked being able to have the CD player going and just press the door switch once to cut the chime. So... Back to the service manuals...
My plan was to wire the 2001 to match the 98. 5 and have everything work like I wanted it to. Well, that's not going to happen. While comparing the IEM connector between the 98 and 2001, I noticed the 2001's lacks a critical function in Pin #13. This function is "Key-in lamp driver. " The halo lamp, plain and simple. Why they eliminated it, I do not know. I have not yet tested Pin #13 in the 2001, but that is my next project. Perhaps the 2001's are just not wired for the halo lamp. THe provision for it
could be in the IEM, and that's what I am going to find out tonight. I'll post an update. If it does have it, I'm set, and all I have to do is run a couple of wires to get the halo lamp to work.
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The chime re-wiring might be a little more tricky, if it is possible at all. The problem is that I want to retain the lock disable feature so I don't lock my keys in the truck! Well, I am out to the garage, watch for an update!
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****UPDATE****
Well, I foound out something good! The IEM is identical to the one in the 98. 5. Pin #13 shows 12. 8 volts, like it is supposed to. All I gotta do now is connect a couple of wires, and I will have a halo light!
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I am still working on the chime thing...
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****UPDATE #2****
Well, it didn't go as planned. The IEM is a little different and doesn't support the halo light. So I connected in tot he dome light circuit, tapping into it at the top of the A-pillar. The wires I connected to are the pink one and the yellow one. I connected these to the halo light pigtail, and it works great!
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BOMBED
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Evan A. Beck "NW PUNK"
Prez, NW BOMBers
'01 2500HD 4x2 QC, 139" WB, 6-speed, ETH, SLT... yadda yadda yadda... K&N, 3" "PIPE BOMB", 6-way turn signal conversion, aux. backup lights, Line-X.
2,945 miles and counting!
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[This message has been edited by Evan A. Beck (edited 05-28-2000). ]