# HUD brightness **URL:** \ **Category:** SON240sx Automotive\ **Created:** [September 29, 2003, 10:38am UTC](https://forums.speedlife.net/t/hud-brightness/80115 "2003-09-29T10:38:45Z")\ **Posts on this page:** 11\ **Page:** 1
**Author:** ![Gonad](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/gonad/32/5481_2.png) [@Gonad](https://forums.speedlife.net/u/Gonad)\ **Post date:** [September 29, 2003, 10:38am UTC](https://forums.speedlife.net/t/hud-brightness/80115/1 "2003-09-29T10:38:45Z")
Ok, my HUD works fine, but I just noticed something. The brightness that I set to won’t remain the same when I turn the car off and start it back on. Like if I put it on FULL brightness, and then turn the car off, and then next time I start it back up, the brightness is back to the NORMAL position. Is this normal or is my HUD somewhat showing signs of dying? ---
**Author:** ![SHIFT\_KA24DET](https://avatars.discourse-cdn.com/v4/letter/s/b9bd4f/32.png) [@SHIFT\_KA24DET](https://forums.speedlife.net/u/SHIFT_KA24DET)\ **Post date:** [September 29, 2003, 1:58pm UTC](https://forums.speedlife.net/t/hud-brightness/80115/2 "2003-09-29T13:58:28Z")
Its your TCU man. That happend to me when my TCU fried. Next setp is total Black Out. Well at least thats what happened to me. ---
**Author:** ![SHIFT\_KA24DET](https://avatars.discourse-cdn.com/v4/letter/s/b9bd4f/32.png) [@SHIFT\_KA24DET](https://forums.speedlife.net/u/SHIFT_KA24DET)\ **Post date:** [September 29, 2003, 4:06pm UTC](https://forums.speedlife.net/t/hud-brightness/80115/3 "2003-09-29T16:06:59Z")
Timing control unit. It controls a bunch of little things like wiper timing, door chime timing, gauge cluster pulse timing (Brightness) etc. ---
**Author:** ![iQuAGoD](https://avatars.discourse-cdn.com/v4/letter/i/f05b48/32.png) [@iQuAGoD](https://forums.speedlife.net/u/iQuAGoD)\ **Post date:** [September 29, 2003, 4:23pm UTC](https://forums.speedlife.net/t/hud-brightness/80115/4 "2003-09-29T16:23:39Z")
i think i need a new TCU, every now and then my wipers come on for no apparent reason… ---
**Author:** ![suds240](https://avatars.discourse-cdn.com/v4/letter/s/ecccb3/32.png) [@suds240](https://forums.speedlife.net/u/suds240)\ **Post date:** [September 29, 2003, 4:31pm UTC](https://forums.speedlife.net/t/hud-brightness/80115/5 "2003-09-29T16:31:24Z")
Adam, could this TCU you talk about cause wipers not to work occasionally when they are switched to intermittent? Just a stab in the dark but whatever. ---
**Author:** ![SHIFT\_KA24DET](https://avatars.discourse-cdn.com/v4/letter/s/b9bd4f/32.png) [@SHIFT\_KA24DET](https://forums.speedlife.net/u/SHIFT_KA24DET)\ **Post date:** [September 29, 2003, 4:36pm UTC](https://forums.speedlife.net/t/hud-brightness/80115/6 "2003-09-29T16:36:45Z")
Ya both of you guys are esxperiencing TCU troubles. I spent countless hoursing reserching this stupid POS when my gauge lights randomally stoped wotking. I have a spare TCU if anyone wants it though i bypassed the dimmer control unit on it so the lights stay on full brightness all the time. ---
**Author:** ![Sven](https://avatars.discourse-cdn.com/v4/letter/s/e47c2d/32.png) [@Sven](https://forums.speedlife.net/u/Sven)\ **Post date:** [September 29, 2003, 5:31pm UTC](https://forums.speedlife.net/t/hud-brightness/80115/7 "2003-09-29T17:31:08Z")
The FSM describes various tests you can do to ensure your unit is working (or not …) ---
**Author:** ![Gonad](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/gonad/32/5481_2.png) [@Gonad](https://forums.speedlife.net/u/Gonad)\ **Post date:** [September 29, 2003, 8:43pm UTC](https://forums.speedlife.net/t/hud-brightness/80115/8 "2003-09-29T20:43:28Z")
Well the rest of my stuff works (wipers, chims, etc.) So how hard is this TCU to replace? And what’s the cost? BTW, First dibs on Adam’s spare TCU! :twisted: ---
**Author:** ![SHIFT\_KA24DET](https://avatars.discourse-cdn.com/v4/letter/s/b9bd4f/32.png) [@SHIFT\_KA24DET](https://forums.speedlife.net/u/SHIFT_KA24DET)\ **Post date:** [September 30, 2003, 9:36am UTC](https://forums.speedlife.net/t/hud-brightness/80115/9 "2003-09-30T09:36:51Z")
Its $220 from Nissan and its likea 5min job to replace. ---
**Author:** ![Gonad](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/gonad/32/5481_2.png) [@Gonad](https://forums.speedlife.net/u/Gonad)\ **Post date:** [September 30, 2003, 9:56am UTC](https://forums.speedlife.net/t/hud-brightness/80115/10 "2003-09-30T09:56:33Z")
Can you tell me how to bypass the TCU? Will this have any effect on the rest of my accessories? I’ll try looking up the TCU in the FSM in the meantime… ---
**Author:** ![SHIFT\_KA24DET](https://avatars.discourse-cdn.com/v4/letter/s/b9bd4f/32.png) [@SHIFT\_KA24DET](https://forums.speedlife.net/u/SHIFT_KA24DET)\ **Post date:** [September 30, 2003, 2:39pm UTC](https://forums.speedlife.net/t/hud-brightness/80115/11 "2003-09-30T14:39:30Z")
I didnt Bypass the TCU it self i tore it apart and re-wired it. You can try it out at the meet on sunday, hmmm if i can find it.