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Old 12-01-2019, 02:14 PM   #1
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Dash Lights Stay On

My dash lights stay on after the engine is turned off. I don't know if this is a new issue or if it has been doing it for a while because you can only really see it at night. I know my Scan Gauge D used to turn itself off after the engine was killed but now it is staying on too.
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Old 12-08-2019, 12:42 PM   #2
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There wasn't a question stated there, but I'll offer that a bad ground on some other related circuit could be feeding back through the dash lights. I would poke around for ground faults.

One way to "imply" the bad ground is to connect a fused jumper wire to a known good ground and touch it to the ground wires and chassis (housings) of electric devices and controls that SHOULD stay on with the key off. I use a 2-amp glass fuse. When you touch one and the light goes out (without setting the bus on fire), you've got the suspect.

Be very careful of the things you probe, even with the fuse in the jumper. Light shows under the dash are pretty, but counterproductive.

Another possibility is a bad relay (if used). This can be tested for by pulling relays one at a time until the light goes out. Then swap the relay with a known good unit.


That's all I've got.
Good luck!
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Old 12-09-2019, 07:53 AM   #3
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Picked it up from Freightliner dealer Friday. Here is verbiage from service ticket.


Dash lights stay on and brake lights flicker. Pulled unit into shop and performed diag. Removed old ICU and installed new ICU and found dash lights do not stay on and brake lights do not flicker any more. Found ICU is covered under basic warranty and ordered new replacement ICU. Installed new ICU and found same issue with ICU staying powered up. Installed a test bulkhead module and still found same issue. Checked service solutions and found chassis module will wake bulkhead module back up and keep ICU powered up. Installed test chassis module and found ICU will power down like it is supposed to and installed new chassis module. Retested after installation of new chassis module and found no issues. All works. Turned in old defective chassis module to parts department. Chassis module part #A66-03087-000.
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Old 12-10-2019, 01:30 PM   #4
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Did they tell you what a chassis module is?
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Old 12-10-2019, 08:44 PM   #5
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Quote:
Originally Posted by rodekyll View Post
Did they tell you what a chassis module is?

No. never talked to tech.
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