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    How to fix "rear doors open" or "liftgate open" instrument cluster messages

    Additional info: the battery drain issue relates to the BCM always thinking the doors are open, and thus keeping Retained Accessory Power (RAP). So circuits that would otherwise shut down, like the radio, amp, etc. stay activated and consume power. When I had this problem, I measured around 2-3...
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    How to fix "rear doors open" or "liftgate open" instrument cluster messages

    Here's the PCB: If we zoom in to part of the circuit, the red pin and trace corresponds to the liftgate ajar signal. The 1200R serves as part of the pullup (purple traces correspond to +Vcc). The red trace is also measured at the microcontroller:
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    How to fix "rear doors open" or "liftgate open" instrument cluster messages

    Hi Guys, This will be my last post here, as I no longer have a Tahoe. I thought I'd share the solution that took me a year to track down. Ever since I owned my Tahoe, I could not use the feature of having the interior lights come on when a door was opened, otherwise they would never turn off...
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    How to Install and Wire Up Halo Headlights

    How to Open Lens: Heat up the housings to ~400 deg Fahrenheit, in the oven makes it easier. This relaxes the RTV that was used to seal and glue the lens on. If you don’t have access to an oven (like me) a heat gun works too, you just need to separate the lens in sections. There’s latches where...
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    How to Install and Wire Up Halo Headlights

    Finally, the results: Driver Side Passenger Side Bam!
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    How to Install and Wire Up Halo Headlights

    You can see the bulb driver (small rectangular box) attached to the bulb in the last posted picture above. With the brackets back on, now attention can be turned to wiring. The bulbs themselves, or rather the bulb drivers plug into the vehicle wiring harness no problem. Nothing to deal with...
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    How to Install and Wire Up Halo Headlights

    The epoxy was spread around the inside rim of the LED bulb with a popsicle stick: Then the bulb was set down inside the hole and centered. Gorilla tape was used to clamp the bulb and hold in place until the epoxy setup: All 4 bulbs were done that way. Above shows after epoxy has cured. This...
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    How to Install and Wire Up Halo Headlights

    Upper Headlight Housings Preparations The LED bulbs don’t fit quite as nicely in the upper housings. In the low beam position, the holes are too small for the LED bulbs to fit through. In the high beam position, the hole is too wide for the bulb shaft, so the o-ring on the shaft doesn’t provide...
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    How to Install and Wire Up Halo Headlights

    Zip tie installed: With that side of the lower driver side headlight housing secured, this latch starts to pop out easily: Here is the lower housing with the latch locked into the notch on Tahoe: Solution: Drive self tapping screw half way into Tahoe bracket. Use the screw as an anchor...
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    How to Install and Wire Up Halo Headlights

    Preparation Scanning the Amazon reviews, there were 3 things I identified people having a problem with: - condensation in the housings - poorly fitting or loose lower driver side housing, when securing it to the vehicle - poor quality plastic, and sometimes breaking installation brackets during...
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    How to Install and Wire Up Halo Headlights

    Turn Signals Sylvania Zevo 194 Amber bulbs https://www.amazon.com/SYLVANIA-Bright-Interior-Lighting-Contains/dp/B01CKQP49I Novita LM487 Flasher https://www.amazon.com/dp/B001KS6GIG Other materials used: Loctite Clear Silicone Waterproof Sealant https://www.amazon.com/dp/B0002BBX3U Heat...
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    How to Install and Wire Up Halo Headlights

    This is a how to for installing these headlights: https://www.amazon.com/dp/B083G8H4BV?psc=1 Here's the parts and tools used: JDM ASTAR Bright White Max 50W High Power 880 LED Fog Light Bulbs https://www.amazon.com/dp/B00NJ903MY?psc=1&ref=ppx_yo2_dt_b_product_details Hi Beam & Low Beam...
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    2003 Tahoe, Losing Fuel Pressure, Fuel Pump has been Replaced

    Gotcha. Leaking at the top, bottom, or sides of the interface where the runners meet the heads? or run a bead all the way around the gasket piece?
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    2003 Tahoe, Losing Fuel Pressure, Fuel Pump has been Replaced

    Here is some interesting information, the crank relearn procedure doesnt impact the running of the engine, it only impacts the setting of DTC's. From https://ls1tech.com/forums/pcm-diagnostics-tuning/1264257-crank-relearn-p1336-how-do-2.html
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    2003 Tahoe, Losing Fuel Pressure, Fuel Pump has been Replaced

    Thank you for that Mr Rockola I understand your point about cam or crank sensor performing worse as they warm up. As I understand it though, the cam sensor is ONLY used at startup, to find TDC in the firing stroke. Ive read the engine will start and run without the cam sensor, but not the crank...
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    2003 Tahoe, Losing Fuel Pressure, Fuel Pump has been Replaced

    Thanks. Thats good info about the cam and crank sensors. Going to replace them next weekend and will report back. I have read a lot about the Dorman intakes leaking. Are you talking about leaking where the runners meet the heads or at the seam where the intake halves are joined? To remedy any...
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    2003 Tahoe, Losing Fuel Pressure, Fuel Pump has been Replaced

    Sounds good, I'll do it again. I have done it once already, but for sure it can't hurt to do again!
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    2003 Tahoe, Losing Fuel Pressure, Fuel Pump has been Replaced

    So to recap- the main problem is the hard starts. With fuel pressure being close to within spec, perhaps low fuel pressure is not the root cause. The behavior of the hard starting is this: one in 10 times it will start as soon as I turn the key. Most of the time it takes 2-3 turns of the key to...
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    2003 Tahoe, Losing Fuel Pressure, Fuel Pump has been Replaced

    Gotcha thanks very much for that. Perhaps the fuel pressure is not the root cause. The root symptom I am trying to resolve is hard starting. Sometimes it will start in 1 crank. More often it takes 2-3 cranks. If we assume fuel pressure is acceptable, the only other things I can think of which...
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    2003 Tahoe, Losing Fuel Pressure, Fuel Pump has been Replaced

    Gotcha yea Delphi is my next go to option if I replace the pump again. I'd like to test the pump, but I don't know where I would find an adapter to attach to those quick connects at the fuel rail. It's 3/8 flare right? I remember there's two types of flared fittings but can't remember which type...
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    2003 Tahoe, Losing Fuel Pressure, Fuel Pump has been Replaced

    Hi Guys, I'm having a problem that I could use some expertise in guiding to a solution. The 5.3 non-flex fuel engine starts hard. Usually takes two cranks to get it running. I did some fuel pressure tests - I'm losing fuel pressure, there's a leak somewhere. Here's the data Key On Engine Off...

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