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2002 S40 DIM not working, short circuit

Help, Advice, Owners' Discussion and DIY Tutorials devoted to the second generation C70, S40 and V50 Volvos -- awkwardly model year 2004 ½ onwards -- plus where to go for advice and discussion on Volvo's sporty C30 Coupe powered by Volvo's ubiquitous inline 5-cylinder power plant.
jket1961
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jket1961

2002 S40 DIM not working, short circuit

Post by jket1961 » Mon Oct 15, 2018 4:27 pm

Replaced the heater core in my 2002 S40, straightforward uneventful procedure. Plugged all wire harnesses back in, replaced the dash and when I reconnected the battery I discovered that the DIM wasn't functioning at all; in addition, I found that the fuse titled 'Position Light' in the fuse box under the hood was blown. I replaced it and it blew again, clearly a short to ground somewhere. I removed the DIM and replaced the same fuse, this time it didn't blow. My question is, does it seem likely that the DIM developed a short as a result of being removed and put back and is it likely the short in the DIM could be causing the issue? Any advice is greatly appreciated! Thanks!

Jim

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RickHaleParker
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Re: 2002 S40 DIM not working, short circuit

Post by RickHaleParker » Mon Oct 15, 2018 6:47 pm

"Position Light" is Volvo-speak for Corner Lights AKA Parking lights ... they mark the car's position.
More likely it is a lighting wiring harness that got moved to a condition where it shorted when the dim was reinstalled.
Platform: P80 1998 C70, B5234T3, 16T, AW50-42, Bosch Motronic 4.4, Special Edition package, Plant: Uddevalla Sweden.

Platform: X40 (Nedcar) 2003 S40, B4204T3, 14T twin scroll AW55-50/51SN, Siemens EMS 2000. Plant: Born Netherlands.

Platform P2 2005 XC90 T6 Executive, B6294T, 4T65 AWD, Bosch Motronic 7.0,
Plant Torslanda Sweden.
----------------------------------------------------------------
1997 S90, B6304S, AW30-42, Bosch Motronic 4.4 - Sold

jket1961
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Re: 2002 S40 DIM not working, short circuit

Post by jket1961 » Tue Oct 16, 2018 5:23 am

Very much appreciated, I’ll be removing the dash and inspecting the harnesses to see if I can identify the culprit.

jket1961
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Re: 2002 S40 DIM not working, short circuit

Post by jket1961 » Tue Oct 16, 2018 3:19 pm

The other is that in addition to the DIM not working, the headlights and taillights remain on even when the ignition has been switched off. Also...the only way I get ANY lights coming up on the DIM is if I activate the high beams, when I do this I get SOME of the display coming up on the DIM, as soon as I release the high beam switch, the DIM goes dead again. Does this point to any particular location in the electrical system? Thanks again for ANY insight you may offer!

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Re: 2002 S40 DIM not working, short circuit

Post by chrism » Thu Feb 13, 2020 12:05 pm

Is it possible that when you removed the old heater core that you may have spilled some coolant into some sort of “electronically important” component?

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